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I have a SQL dump of a legacy DB, and a folder with images, and those are referenced by some rows of certain tables, and I need to migrate that data to the new Django models. The specific problem is how to "perform" the upload, but in a management command.
When the table with the field referenced is migrated to it's co... | 1 | 0 | 0 | 0 | false | 8,280,938 | 1 | 438 | 1 | 0 | 0 | 8,280,859 | One approach would be to create a utility django project specifying your legacy database in settings.py. Then use the inspectdb management command to create a django model representation of your legacy database. And finally use dumpdata to get you data in JSON format.
You could then finally make your own JSON script th... | 1 | 0 | 0 | Migrate a legacy DB to Django, with image files | 1 | python,django,data-migration,filefield | 0 | 2011-11-26T19:05:00.000 |
Background: I am writing a matching script in python that will match records of a transaction in one database to names of customers in another database. The complexity is that names are not unique and can be represented multiple different ways from transaction to transaction.
Rather than doing multiple queries on the d... | 0 | 0 | 0 | 0 | false | 8,299,759 | 0 | 98 | 2 | 0 | 0 | 8,299,614 | Your strategy is reasonable though I would first look at doing as much of the work as possible in the database query using LIKE and other SQL functions. It should be possible to make a query that matches complex criteria. | 1 | 0 | 0 | Could someone give me their two cents on this optimization strategy | 3 | python,mysql | 1 | 2011-11-28T17:14:00.000 |
Background: I am writing a matching script in python that will match records of a transaction in one database to names of customers in another database. The complexity is that names are not unique and can be represented multiple different ways from transaction to transaction.
Rather than doing multiple queries on the d... | 0 | 2 | 0.132549 | 0 | false | 8,299,780 | 0 | 98 | 2 | 0 | 0 | 8,299,614 | Regarding: "would this be faster:"
The behind-the-scenes logistics of the SQL engine are really optimized for this sort of thing. You might need to create an SQL PROCEDURE or a fairly complex query, however.
Caveat, if you're not particularly good at or fond of maintaining SQL, and this isn't a time-sensitive query, th... | 1 | 0 | 0 | Could someone give me their two cents on this optimization strategy | 3 | python,mysql | 1 | 2011-11-28T17:14:00.000 |
I am making an internal API in Python (pardon my terms) that provides a layer over MySQL and Solr (databases) with only simple computing. A Python program that spawns from scratch waits 80ms for Solr, while taking negligible time by itself.
I am worried about the incomplete threading support of Python. So which of the... | 1 | 1 | 0.197375 | 0 | false | 8,842,820 | 0 | 1,136 | 1 | 0 | 0 | 8,308,610 | Apparently TProcessPoolServer is a good server and forks different processes, avoiding threading issues. | 1 | 0 | 0 | Performance of TNonblockingServer, TThreadPoolServer for DB-bound server in Python | 1 | python,thrift | 0 | 2011-11-29T09:42:00.000 |
The idea is to make a script that would get stored procedure and udf contents (code) every hour (for example) and add it to SVN repo. As a result we have sql versioning control system.
Does anyone know how to backup stored procedure code using Python (sqlAlchemy, pyodbc or smth).
I'v done this via C# before using SQL ... | 0 | 1 | 0.197375 | 0 | false | 8,414,549 | 1 | 244 | 1 | 0 | 0 | 8,412,636 | There is no easy way to access SMO from Python (because there is no generic solution for accessing .NET from Python), so I would write a command-line tool in C# and call it from Python using the subprocess module. Perhaps you could do something with ctypes but I have no idea if that's feasible.
But, perhaps a more impo... | 1 | 0 | 0 | backup msSQL stored proc or UDF code via Python | 1 | c#,python,sql-server,stored-procedures,smo | 0 | 2011-12-07T09:00:00.000 |
I am parsing the USDA's food database and storing it in SQLite for query purposes. Each food has associated with it the quantities of the same 162 nutrients. It appears that the list of nutrients (name and units) has not changed in quite a while, and since this is a hobby project I don't expect to follow any sudden c... | 2 | 4 | 0.379949 | 0 | false | 8,431,705 | 0 | 373 | 1 | 0 | 0 | 8,431,451 | Use the second (more normalized) approach.
You could even get away with fewer tables than you mentioned:
tblNutrients
-- NutrientID
-- NutrientName
-- NutrientUOM (unit of measure)
-- Otherstuff
tblFood
-- FoodId
-- FoodName
-- Otherstuff
tblFoodNutrients
-- FoodID (FK)
-- NutrientID (FK)
-- UOMCount
It will b... | 1 | 0 | 0 | How to store data with large number (constant) of properties in SQL | 2 | c++,python,sql,sqlite | 0 | 2011-12-08T13:07:00.000 |
I have a question about making the decision whether to use MySQL database or Mongo database, the problem with my decision is that I am highly depending on these things:
I want to select records between two dates (period)
However is this possible?
My Application won't do any complex queries, just basic crud. It has Fa... | 1 | 1 | 1.2 | 0 | true | 8,437,321 | 0 | 295 | 2 | 0 | 0 | 8,437,213 | MySQL(SQL) or MongoDB(NoSQL), both can work for your needs. but idea behind using RDBMS/NoSQL is the requirement of your application
if your application care about speed and no relation between the data is necessary and your data schema changes very frequently, you can choose MongoDB, faster since no joins needed, e... | 1 | 0 | 0 | MongoDB or MySQL database | 3 | mysql,mongodb,mysql-python | 0 | 2011-12-08T20:25:00.000 |
I have a question about making the decision whether to use MySQL database or Mongo database, the problem with my decision is that I am highly depending on these things:
I want to select records between two dates (period)
However is this possible?
My Application won't do any complex queries, just basic crud. It has Fa... | 1 | 3 | 0.197375 | 0 | false | 8,437,280 | 0 | 295 | 2 | 0 | 0 | 8,437,213 | Either DB will allow you to filter between dates and I wouldn't use that requirement to make the decision. Some questions you should answer:
Do you need to store your data in a relational system, like MySQL? Relational databases are better at cross entity joining.
Will your data be very complicated, but you will only... | 1 | 0 | 0 | MongoDB or MySQL database | 3 | mysql,mongodb,mysql-python | 0 | 2011-12-08T20:25:00.000 |
I'm looking for a flat-file, portable key-value store in Python. I'll be using strings for keys and either strings or lists for values. I looked at ZODB but I'd like something which is more widely used and is more actively developed. Do any of the dmb modules in Python require system libraries or a database server (lik... | 2 | 2 | 0.099668 | 0 | false | 8,528,030 | 0 | 4,198 | 1 | 0 | 0 | 8,528,001 | You can look at the shelve module. It uses pickle under the hood, and allows you to create a key-value look up that persists between launches.
Additionally, the json module with dump and load methods would probably work pretty well as well. | 1 | 0 | 1 | Flat file key-value store in python | 4 | python | 0 | 2011-12-15T23:22:00.000 |
I'm user of a Python application that has poorly indexed tables and was wondering if it's possible to improve performance by converting the SQLite database into an in-memory database upon application startup. My thinking is that it would minimize the issue of full table scans, especially since SQLite might be creating ... | 2 | 0 | 0 | 0 | false | 8,549,565 | 0 | 1,450 | 2 | 0 | 0 | 8,549,326 | Whenever you set a variable in Python you are instantiating an object. This means you are allocating memory for it.
When you query sqlite you are simply reading information off the disk into memory.
sqlalchemy is simply an abstraction. You read the data from disk into memory in the same way, by querying the database... | 1 | 0 | 0 | Is it possible to read a SQLite database into memory with SQLAlchemy? | 2 | python,sqlite,sqlalchemy | 0 | 2011-12-18T01:59:00.000 |
I'm user of a Python application that has poorly indexed tables and was wondering if it's possible to improve performance by converting the SQLite database into an in-memory database upon application startup. My thinking is that it would minimize the issue of full table scans, especially since SQLite might be creating ... | 2 | 1 | 0.099668 | 0 | false | 10,002,601 | 0 | 1,450 | 2 | 0 | 0 | 8,549,326 | At the start of the program, move the database file to a ramdisk, point SQLAlchemy to it and do your processing, and then move the SQLite file back to non-volatile storage.
It's not a great solution, but it'll help you determine whether caching your database in memory is worthwhile. | 1 | 0 | 0 | Is it possible to read a SQLite database into memory with SQLAlchemy? | 2 | python,sqlite,sqlalchemy | 0 | 2011-12-18T01:59:00.000 |
I've been learning python by building a webapp on google app engine over the past five or six months. I also just finished taking a databases class this semester where I learned about views, and their benefits.
Is there an equivalent with the GAE datastore using python? | 2 | 5 | 1.2 | 0 | true | 8,570,245 | 1 | 106 | 1 | 1 | 0 | 8,570,066 | Read-only views (the most common type) are basically queries against one or more tables to present the illusion of new tables. If you took a college-level database course, you probably learned about relational databases, and I'm guessing you're looking for something like relational views.
The short answer is No.
The GA... | 1 | 0 | 0 | Is there an equivalent of a SQL View in Google App Engine Python? | 2 | python,sql,google-app-engine | 0 | 2011-12-20T02:21:00.000 |
I am writing a quick and dirty script which requires interaction with a database (PG).
The script is a pragmatic, tactical solution to an existing problem. however, I envisage that the script will evolve over time into a more "refined" system. Given the fact that it is currently being put together very quickly (i.e. I ... | 57 | 108 | 1.2 | 0 | true | 8,588,766 | 0 | 40,683 | 2 | 0 | 0 | 8,588,126 | SQLAlchemy is a ORM, psycopg2 is a database driver. These are completely different things: SQLAlchemy generates SQL statements and psycopg2 sends SQL statements to the database. SQLAlchemy depends on psycopg2 or other database drivers to communicate with the database!
As a rather complex software layer SQLAlchemy does... | 1 | 0 | 0 | SQLAlchemy or psycopg2? | 2 | python,postgresql,sqlalchemy,psycopg2 | 0 | 2011-12-21T10:08:00.000 |
I am writing a quick and dirty script which requires interaction with a database (PG).
The script is a pragmatic, tactical solution to an existing problem. however, I envisage that the script will evolve over time into a more "refined" system. Given the fact that it is currently being put together very quickly (i.e. I ... | 57 | 11 | 1 | 0 | false | 8,589,254 | 0 | 40,683 | 2 | 0 | 0 | 8,588,126 | To talk with database any one need driver for that. If you are using client like SQL Plus for oracle, MysqlCLI for Mysql then it will direct run the query and that client come with DBServer pack.
To communicate from outside with any language like java, c, python, C#... We need driver to for that database. psycopg2 is ... | 1 | 0 | 0 | SQLAlchemy or psycopg2? | 2 | python,postgresql,sqlalchemy,psycopg2 | 0 | 2011-12-21T10:08:00.000 |
I have to compare massive database dumps in xls format to parse for changes day-to-day (gross, right?). I'm currently doing this in the most backwards way possible, and using xlrd to turn the xls into csv files, and then I'm running diffs to compare them.
Since it's a database, and I don't have a means of knowing if th... | 2 | 0 | 0 | 0 | false | 8,609,909 | 0 | 19,719 | 1 | 0 | 0 | 8,609,737 | You could load the data into a database, and compare the databases. If you think that is easier.
The key question you might need to think about is: can you sort the data somehow?
Sorted sets are so much easier to handle.
P.S. 75000 lines is not very much. Anything that fits into main memory of a regular computer is not... | 1 | 0 | 0 | Python comparing two massive sets of data in the MOST efficient method possible | 3 | python,database,diff,set,compare | 0 | 2011-12-22T21:08:00.000 |
I am using postgresql in ubuntu, and now i am working on python. I want to connect postgresql with an android application. Is there any way to connect postgresql with an android application?
Any reply would be appreciated. | 0 | 2 | 0.379949 | 0 | false | 8,613,304 | 0 | 377 | 1 | 0 | 0 | 8,613,246 | Better way is to Use RestFUL API or WebService as front end for your Android device to connect to your PostgreSQL backend. I am not sure if it is possible to directly connect your android device to postgre SQL. | 1 | 0 | 0 | what is the way to connect postgresql with android in ubuntu | 1 | android,python,web-services,postgresql,ubuntu-10.04 | 0 | 2011-12-23T07:11:00.000 |
I'm writing a script where by a user registers his/her username, but a function checks whether this username is already in the db or not. But I'm stuck on how to match my query with the input. Here is the code:
def checker(self, insane):
t = (insane,) ... | 0 | 1 | 1.2 | 0 | true | 8,617,856 | 0 | 1,309 | 1 | 0 | 0 | 8,617,837 | The DB fetch models return a tuple for each row. Since you've only selected a single field, you can simply access namer[0] to get the actual value. | 1 | 0 | 0 | Matching user's input with query from sqlite3 db in python | 1 | python,sql,sqlite | 0 | 2011-12-23T15:40:00.000 |
I've looked in the documentation and haven't seen (from first sight) anything about cache in Pyramid. Maybe I missed something... Or maybe there are some third party packages to help with this.
For example, how to cache db query (SQLAlchemy), how to cache views? Could anyone give some link to examples or documentation?... | 3 | 6 | 1 | 0 | false | 14,859,955 | 0 | 4,486 | 1 | 0 | 0 | 8,651,061 | Your options are pyramid_beaker and dogpile.cache
pyramid_beaker was written to offer beaker caching for sessions. it also lets you configure beaker cache regions, which can be used elsewhere.
dogpile.cache is a replacement for beaker. it hasn't been integrated to offer session support or environment.ini based setup... | 1 | 0 | 0 | How to cache using Pyramid? | 2 | python,sqlalchemy,pyramid | 0 | 2011-12-28T01:50:00.000 |
I'm engaged in developing a turn-based casual MMORPG game server.
The low level engine(NOT written by us) which handle networking,
multi-threading, timer, inter-server communication, main game loop etc, was
written by C++. The high level game logic was written by Python.
My question is about the data model design in ou... | 8 | 2 | 0.197375 | 0 | false | 8,660,848 | 0 | 3,298 | 2 | 0 | 0 | 8,660,622 | It's difficult to comment on the entire design/datamodel without greater understanding of the software, but it sounds like your application could benefit from an in-memory database.* Backing up such databases to disk is (relatively speaking) a cheap operation. I've found that it is generally faster to:
A) Create an i... | 1 | 0 | 0 | Need suggestion about MMORPG data model design, database access and stackless python | 2 | python,database,python-stackless | 0 | 2011-12-28T19:57:00.000 |
I'm engaged in developing a turn-based casual MMORPG game server.
The low level engine(NOT written by us) which handle networking,
multi-threading, timer, inter-server communication, main game loop etc, was
written by C++. The high level game logic was written by Python.
My question is about the data model design in ou... | 8 | 6 | 1.2 | 0 | true | 8,660,935 | 0 | 3,298 | 2 | 0 | 0 | 8,660,622 | I've worked with one MMO engine that operated in a somewhat similar fashion. It was written in Java, however, not Python.
With regards to your first set of points:
1) async db access We actually went the other route, and avoided having a “main game logic thread.” All game logic tasks were spawned as new threads. The ov... | 1 | 0 | 0 | Need suggestion about MMORPG data model design, database access and stackless python | 2 | python,database,python-stackless | 0 | 2011-12-28T19:57:00.000 |
Apologies for the longish description.
I want to run a transform on every doc in a large-ish Mongodb collection with 10 million records approx 10G. Specifically I want to apply a geoip transform to the ip field in every doc and either append the result record to that doc or just create a whole other record linked to th... | 3 | 1 | 1.2 | 0 | true | 8,666,791 | 0 | 477 | 2 | 0 | 0 | 8,663,432 | Since you have to go over "each record", you'll do one full table scan anyway, then a simple cursor (find()) + maybe only fetching few fields (_id, ip) should do it. python driver will do the batching under the hood, so maybe you can give a hint on what's the optimal batch size (batch_size) if the default is not good e... | 1 | 0 | 0 | How do I transform every doc in a large Mongodb collection without map/reduce? | 2 | python,mongodb,mapreduce | 0 | 2011-12-29T02:33:00.000 |
Apologies for the longish description.
I want to run a transform on every doc in a large-ish Mongodb collection with 10 million records approx 10G. Specifically I want to apply a geoip transform to the ip field in every doc and either append the result record to that doc or just create a whole other record linked to th... | 3 | 0 | 0 | 0 | false | 8,677,503 | 0 | 477 | 2 | 0 | 0 | 8,663,432 | Actually I am also attempting another approach in parallel (as plan B) which is to use mongoexport. I use it with --csv to dump a large csv file with just the (id, ip) fields. Then the plan is to use a python script to do a geoip lookup and then post back to mongo as a new doc on which map-reduce can now be run for c... | 1 | 0 | 0 | How do I transform every doc in a large Mongodb collection without map/reduce? | 2 | python,mongodb,mapreduce | 0 | 2011-12-29T02:33:00.000 |
I have a row of data in dict format. Is there an easy way to insert it into a mysql table. I know that I can write a custom function to convert dict into a custom sql query, but I am looking for a more direct alternative. | 2 | 2 | 1.2 | 0 | true | 8,674,504 | 0 | 1,650 | 2 | 0 | 0 | 8,674,426 | MySQLDB does not come with anything which allows a direct operation like that. This is a common problem with a variety of answers, including a custom function for this purpose.
In my experience, it is best to buckle down and just write the paramaterized SQL most of the time. If you have the same thing going on a lot,... | 1 | 0 | 0 | MySQLdb inserting a dict into a table | 2 | python,dictionary,insert,mysql-python | 0 | 2011-12-29T22:52:00.000 |
I have a row of data in dict format. Is there an easy way to insert it into a mysql table. I know that I can write a custom function to convert dict into a custom sql query, but I am looking for a more direct alternative. | 2 | 5 | 0.462117 | 0 | false | 8,674,547 | 0 | 1,650 | 2 | 0 | 0 | 8,674,426 | Well... According to the documentation for paramstyle:
Set to 'format' = ANSI C printf format codes, e.g. '...WHERE name=%s'.
If a mapping object is used for conn.execute(), then the interface
actually uses 'pyformat' = Python extended format codes, e.g.
'...WHERE name=%(name)s'. However, the API does not presen... | 1 | 0 | 0 | MySQLdb inserting a dict into a table | 2 | python,dictionary,insert,mysql-python | 0 | 2011-12-29T22:52:00.000 |
Assuming I have a schema with the name "my_schema", how can I create tables with "django syncdb" for that particular schema? Or is there any other alternatives for quickly creating tables from my django models? I think, by default django creates tables for the "public" schema. | 7 | 0 | 0 | 0 | false | 42,578,440 | 1 | 4,285 | 1 | 0 | 0 | 8,680,673 | I have used following info and work for me
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'dab_name',
'USER': 'username',
'PASSWORD': 'password',
'HOST': 'localhost',
'PORT': '5432',
'OPTIONS': {
'options': '-c search_path=to... | 1 | 0 | 0 | How to specify schema name while running "syncdb" in django? | 2 | python,database,django | 0 | 2011-12-30T14:52:00.000 |
For example in CQL,
SELECT * from abc_dimension ORDER BY key ASC;
seems to be not working.
Any help? | 2 | 0 | 0 | 1 | false | 43,361,173 | 0 | 3,328 | 1 | 0 | 0 | 8,751,293 | Latest versions of Cassandra support aggregations within single partition only. | 1 | 0 | 0 | does cassandra cql support aggregation functions, like group by and order by | 3 | python,cassandra,cql | 0 | 2012-01-05T23:13:00.000 |
We are sketching out how a system would work. The problem is that have a set of items with a computed value for each item. Say for example you like players in the nba and there are a certain set of players that you have shown preferences about.
Examples might be:
number of games played
rebounding
scoring
assists
min... | 0 | 0 | 0 | 0 | false | 8,754,480 | 0 | 49 | 1 | 0 | 0 | 8,753,559 | I'm using mongodb right now for the first time and I find it to be really awesome in the way it lets you represent a document pretty much like an object oriented class structure. You can easily have a document per user that stores any number of embedded documents. Your players can be in a nested dictionary or a list, a... | 1 | 0 | 0 | Caching computed results for each user - would having a table dedicated to each user make sense? | 1 | python,mysql,database-design | 0 | 2012-01-06T04:56:00.000 |
Are there any python3 modules for importing(reading) excel .xls files or is there any work in progress on porting one of the python2 modules? All I'm coming up with is xlrd for python2. | 1 | 0 | 0 | 0 | false | 8,797,959 | 0 | 530 | 1 | 0 | 0 | 8,788,041 | I believe the maintainer of xlrd is working on porting it, but it's not yet ready. | 1 | 0 | 0 | python3 module for importing xls files | 1 | excel,python-3.x,xls | 0 | 2012-01-09T11:55:00.000 |
I use xlrd to read data from excel files.
For integers stored in the files, let's say 63, the xlrd interprets it as 63.0 of type number.
Why can't xlrd recognize 63 as an integer?
Assume sheet.row(1)[0].value gives us 63.0. How can I convert it back to 63. | 20 | 5 | 0.16514 | 0 | false | 8,826,320 | 0 | 30,994 | 1 | 0 | 0 | 8,825,681 | I'm reminded of this gem from the xlrd docs:
Dates in Excel spreadsheets
In reality, there are no such things. What you have are floating point
numbers and pious hope.
The same is true of integers. Perhaps minus the pious hope. | 1 | 0 | 0 | Integers from excel files become floats? | 6 | python,xlrd | 0 | 2012-01-11T19:48:00.000 |
I have a regular desktop application which is written in Python/GTK and SQLObject as ORM. My goal is to create a webinterface where a user can login and sync/edit the database. My application is split up in different modules, so the database and gtk code are completly separate, so I would like to run the same database ... | 0 | 0 | 0 | 0 | false | 8,896,107 | 1 | 375 | 1 | 0 | 0 | 8,895,942 | Try the pyramid, it does not impose anything you like as opposed to Django. And has a wealth of features for building Web applications at any level. | 1 | 0 | 0 | Choosing Python/SQLObject webframework | 2 | python,sqlobject | 0 | 2012-01-17T14:05:00.000 |
Well i have a question that i feel i've been answered several times, from what i found here. However, as a newbie, i can't really understand how to perform a really basic operation.
Here's the thing :
i have an .xls and when i use xlrd to get a value i'm just using
sh.cell(0,0) (assuming that sh is my sheet);
if what... | 9 | 0 | 0 | 0 | false | 43,124,531 | 0 | 27,320 | 1 | 0 | 0 | 8,909,342 | The correct answer to this is to simply use the Cell.value function. This will return a number or a Unicode string depending on what the cell contains. | 1 | 0 | 0 | Python xlrd : how to convert an extracted value? | 4 | python,xlrd | 0 | 2012-01-18T11:29:00.000 |
We recently moved a Zeo instance over to a new server environment and one of the changes was the file system now has the database files stored on an NFS share.
When trying to start zeo, we've been getting lock file errors which after researching seems to be because of a known issue of lock files being created on an NFS... | 0 | 1 | 0.197375 | 0 | false | 8,916,946 | 0 | 260 | 1 | 0 | 0 | 8,914,644 | This is likely not a good setup. Your best bet is to work-around NFS in spite of it: maybe a loopback ext3 filesystem mounted on a regular file on the NFS volume -- NFSv3 should have few practical limits to filesize that you won't have natively. Only you will be able to measure if this performs well enough. Otherwis... | 1 | 0 | 0 | Zeo/ZODB lock file location, possible to change? | 1 | python,zope,zodb | 0 | 2012-01-18T17:36:00.000 |
I need to provide individuals with their financial statement, and I am using S3. So far what I am doing is making the file public-read and creating a unique Key, using uuid.uuid4().
Would this be acceptable, or how else could I make this more secure? Sending authentication keys for each individual is not an option. | 1 | 1 | 0.066568 | 0 | false | 8,935,272 | 0 | 260 | 1 | 0 | 0 | 8,935,191 | Even though version 4 UUIDs are supposed to incorporate random data, I wouldn't want to rely on the fact that the RNG used by Python's uuid.uuid4() being securely random. The Python docs make no mention about the quality of the randomness, so I'd be afraid that you might end up with guessable UUID's.
I'm not a crypto e... | 1 | 0 | 0 | Sending 'secure' financial statements on S3 | 3 | python,security,amazon-s3 | 0 | 2012-01-20T00:08:00.000 |
In python, I am firing Sparql queries to get data from dbpedia.
At a point approximately firing 7,000 queries, my script is hangs at line results = sparql.query().convert()
which is already executed atleast 5000 times in the loop
Any idea what could be the issue in it | 1 | 3 | 0.53705 | 0 | false | 8,965,215 | 0 | 157 | 1 | 0 | 1 | 8,965,123 | try splitting up the .query() and .convert() into two separate lines. I would guess that .query() is where it's hanging, and I would further guess that you are being rate-limited by DBPedia, but I can't find any information on what their limits might be. | 1 | 0 | 0 | python script hangs at results = sparql.query().convert() | 1 | python,sparql,mysql-python,dbpedia | 0 | 2012-01-22T22:02:00.000 |
First of all, I am sorry if this question doesn't belong to SO since I don't know where else to post it, anyway...
I am looking for a decent python based database development RAD framework with nice data aware widgets and grids. A desktop framework would be much preferable to a web framework (I've developed heavy DB-ce... | 3 | 1 | 0.099668 | 0 | false | 15,711,432 | 1 | 684 | 1 | 0 | 0 | 9,045,723 | I am also looking for something similar to Kexi. Unfortunately python scripting is not supported in Kexi for windows. I would like to find something better than MS Access, and it does not have to be based on python. So far I have looked at quite a few IDE's but have not found anything where a GUI and database applicati... | 1 | 1 | 0 | Python database widgets/environment like MSAccess | 2 | python,database,widget,rad | 0 | 2012-01-28T13:49:00.000 |
I am building a web App with mongoDB as the backend. Some of the documents need to store a collection of items in some sort of list, and then the system will need to frequently check if a specified item is present in that list. Using Python's 'in' operator takes Big-O(N) time, n being the size of the list. Since the... | 5 | 6 | 1.2 | 0 | true | 9,116,463 | 0 | 2,402 | 1 | 0 | 0 | 9,115,979 | You can represent a set using a dictionary. Your elements become the keys, and all the values can be set to a constant such as 1. The in operator checks for the existence of a key.
EDIT. MongoDB stores a dict as a BSON document, where the keys must be strings (with some additional restrictions), so the above advice is ... | 1 | 0 | 1 | Mongodb with Python's "set()" type | 1 | python,mongodb | 0 | 2012-02-02T16:29:00.000 |
i have Ubuntu and installed python3 since my script is written in it. Since I use MYSQL with MySQLdb, I installed
apt-get install python-mysqldb
however this installed MySQLdb to Python (which is 2.6 on Ubuntu) and not to Python3.
How can I install MySQLdb for Python3
Should I use it at all or switch to PyMSQL
Sorry... | 9 | 1 | 0.028564 | 0 | false | 51,553,512 | 0 | 14,751 | 1 | 0 | 0 | 9,146,320 | If you are planning to switch from MySQLDB then I recommend you to use MySQL connector Python
Why ?
it work with both Python 2 and 3
Because it is official Oracle driver for MySQL for working with Python.
It is purely written in Python
You can also use C extension to connect to MySQL.
MySQL Connector/Python is implem... | 1 | 0 | 0 | install python MySQLdb to python3 not python | 7 | python,mysql,ubuntu,installation | 0 | 2012-02-05T02:06:00.000 |
I have a project in which i use JDBC with MySQL to store some user information, Java REST for the server and Python REST for the client.
My question is: by default(i haven't changed anything in the configurations), are the http requests from the client serialized on the server's side? I ask this because i'd like to kno... | 0 | 1 | 1.2 | 0 | true | 9,158,709 | 1 | 253 | 1 | 0 | 0 | 9,158,578 | Of course they need to be thread safe. You should be writing your Java server as if it were single threaded, because a Java EE app server will assign a thread per incoming request.
You also need to think about database isolation and table locking. Will you allow "dirty reads" or should your transactions be serializab... | 1 | 0 | 0 | Serialization with JDBC with MySQL, JAVA REST and Python REST | 1 | java,python,mysql,rest,jdbc | 0 | 2012-02-06T10:16:00.000 |
Why use py manage.py test ?
What's the point? It creates the table anyway... if I wanted to test it, then I wouldn't want it to create the actual table!!! | 0 | 0 | 1.2 | 0 | true | 9,161,223 | 0 | 126 | 1 | 0 | 0 | 9,160,411 | Test is meant to perform both the upgrade and the downgrade steps. You want to verify that the application is usable in both states. So the idea would be to upgrade, run tests, downgrade, run tests, and verify you don't break things.
If the test run fails, it gives you a chance to clean it up, reset, and try again. Usu... | 1 | 0 | 0 | In SQLAlchemy-migrate, what's the point of using "test"? | 1 | python,mysql,database,sqlalchemy | 0 | 2012-02-06T12:53:00.000 |
I wanted your advice for the best design approach at the following Python project.
I am building a web service system that is split into 2 parts:
This part grabs realtime data from a 3rd party API and puts the data in a DB.
This part exposes a json API to access data from the DB mentioned in 1).
Some background... | 2 | 0 | 1.2 | 0 | true | 9,189,761 | 1 | 319 | 1 | 0 | 0 | 9,182,936 | I would say, run the two on the same machien to start with, and see how the performance goes. Why spend money on a second machine if you don’t have to?
As for “dealing with the ever growing amount of data”—do you need to keep old data around? If not, your second task can simply delete old data when it’s done with it. P... | 1 | 0 | 0 | Realtime data server architecture | 1 | python,real-time | 0 | 2012-02-07T19:56:00.000 |
I am working on a system where a bunch of modules connect to a MS SqlServer DB to read/write data. Each of these modules are written in different languages (C#, Java, C++) as each language serves the purpose of the module best.
My question however is about the DB connectivity. As of now, all these modules use the lang... | 2 | 0 | 0 | 0 | false | 9,456,223 | 0 | 112 | 1 | 0 | 0 | 9,202,562 | If we assume that each language you use will have an optimized set of classes to interact with databases, then there shouldn't be a real need to pass all database calls through a centralized module.
Using a "middle-ware" for database manipulation does offer a very significant advantage. You can control, monitor and man... | 1 | 0 | 0 | DB Connectivity from multiple modules | 1 | python,sql-server,architecture | 0 | 2012-02-08T22:32:00.000 |
Is there any tutorials about how to set-up sqlalchemy for windows? I went to www.sqlalchemy.org and they don't have clear instructions about set-up for windows. When I opened the zipped package, I see distribute_setup, ez_setup and setup.py among other files but it doesn't see to install sqlalchemy. | 1 | 1 | 0.099668 | 0 | false | 29,831,712 | 0 | 9,330 | 1 | 0 | 0 | 9,221,888 | The Command pip install sqlalchemy will download the necessary files and run setup.py install for you. | 1 | 0 | 0 | Configuring sqlalchemy for windows | 2 | python,sql,database,orm,sqlalchemy | 0 | 2012-02-10T02:21:00.000 |
There have been many questions along these lines but I'm struggling to apply them to my scenario. Any help would be be greatly appreciated!
We currently have a functioning mySQL database hosted on a website, data is entered from a website and via PHP it is put into the database.
At the same time we want to now create a... | 2 | 0 | 1.2 | 0 | true | 9,237,543 | 0 | 2,804 | 2 | 0 | 0 | 9,237,481 | How high-performance does your local application need to be? Also, how reliable is the locally available internet connection? If you don't need extremely high performance, why not just leave the data in the remote MySQL server?
If you're sure you need access to local data I'd look at MySQL's built-in replication for s... | 1 | 0 | 0 | Python sync with mySQL for local application? | 3 | php,python,mysql,localhost,sync | 0 | 2012-02-11T03:04:00.000 |
There have been many questions along these lines but I'm struggling to apply them to my scenario. Any help would be be greatly appreciated!
We currently have a functioning mySQL database hosted on a website, data is entered from a website and via PHP it is put into the database.
At the same time we want to now create a... | 2 | 0 | 0 | 0 | false | 9,237,521 | 0 | 2,804 | 2 | 0 | 0 | 9,237,481 | Are you planning to run mysql on your local python offline apps ? I would suggest something like sqlite. As for keeping things in sync, it also depends on the type of data that needs to be synchronized. One question that needs to be answered:
Are the data generated by these python apps something that is opague ? If yes... | 1 | 0 | 0 | Python sync with mySQL for local application? | 3 | php,python,mysql,localhost,sync | 0 | 2012-02-11T03:04:00.000 |
I'm building a database front-end with python and glade. I need to present SQL query results in the form of database tables inside my app's window (schema followed by tuples/records). Both the schema and the database entries are dynamic because the schema could be that of a join operation or in general altered and the ... | 3 | 3 | 1.2 | 0 | true | 9,302,750 | 0 | 2,104 | 1 | 0 | 0 | 9,299,934 | Given that the number and name of the columns to display isn't known beforehand, you could just create a gtk.TreeView widget in glade and modify it as you need in the application code.
This widget could be updated to use a new model using gtk.TreeView.set_model and the columns could be adapted to match the information ... | 1 | 1 | 0 | GUI for database tables with pygtk and glade | 1 | python,user-interface,gtk,pygtk,glade | 0 | 2012-02-15T19:28:00.000 |
I'm having a problem with the sessions in my python/wsgi web app. There is a different, persistent mysqldb connection for each thread in each of 2 wsgi daemon processes. Sometimes, after deleting old sessions and creating a new one, some connections still fetch the old sessions in a select, which means they fail to val... | 9 | 16 | 1.2 | 0 | true | 9,318,495 | 0 | 5,316 | 1 | 0 | 0 | 9,318,347 | MySQL defaults to the isolation level "REPEATABLE READ" which means you will not see any changes in your transaction that were done after the transaction started - even if those (other) changes were committed.
If you issue a COMMIT or ROLLBACK in those sessions, you should see the changed data (because that will end t... | 1 | 0 | 0 | Why are some mysql connections selecting old data the mysql database after a delete + insert? | 2 | python,mysql,session,caching,wsgi | 0 | 2012-02-16T20:09:00.000 |
I am looking to store information in a database table that will be constantly receiving and sending data back and forth to an iPhone App/Python Socket. The problem is, if I were to have my own servers, what is the maximum queries I can sustain?
The reason I'm asking is because if I were to have thousands of people usin... | 4 | 3 | 0.291313 | 0 | false | 9,322,806 | 0 | 1,960 | 1 | 0 | 0 | 9,322,523 | The maximum load is going to vary based on the design of your application and the power of the hardware that you put it on. A well designed application on reasonable hardware will far outperform what you need to get the project off the ground.
If you are unexpectedly successful, you will have money to put into real ... | 1 | 0 | 0 | How many SQL queries can be run at a time? | 2 | iphone,python,mysql,objective-c,database | 0 | 2012-02-17T03:37:00.000 |
I will start a project ( not commercial, just for learning ) but I would like to choose to work with the right tools as I would if I were doing it for a company.
First of all small description of what I will need.
It would be a server-client(s) application.
For the server:
- GUI for Windows
- ORM
- Database without in... | 0 | 0 | 0 | 0 | false | 9,354,732 | 0 | 657 | 1 | 0 | 0 | 9,354,695 | As you have asserted: client is java only.
On server:
GUI for Windows : WPF
ORM - Database without installation : SQLCE 4.0 - Maybe use codefirst
GUI builder (RAD Tool) : Visual Studio lets you do that for WPF apps
Ability to create easily REST Services : Use WCF
hope that helps | 1 | 1 | 0 | Right tools for GUI windows program | 2 | android,python,client-server | 0 | 2012-02-20T00:15:00.000 |
I'm new to Python (relatively new to programing in general) and I have created a small python script that scrape some data off of a site once a week and stores it to a local database (I'm trying to do some statistical analysis on downloaded music). I've tested it on my Mac and would like to put it up onto my server (VP... | 1 | 1 | 0.066568 | 0 | false | 9,357,006 | 1 | 865 | 1 | 1 | 0 | 9,356,926 | Copy script to server
test script manually on server
set cron, "crontab -e" to a value that will test it soon
once you've debugged issues set cron to the appropriate time. | 1 | 0 | 0 | Deploying a Python Script on a Server (CentOS): Where to start? | 3 | python,django,centos | 0 | 2012-02-20T06:14:00.000 |
I have a column heading Fee. Using xlwt in python, I successfully generated the required excel.This column is always blank at the creation of Excel file.
Is it possible to have the Fee column preformatted to 'Currency' and 'two decimal places', so that when I write manually in the Fee column of the Excel file after dow... | 5 | 11 | 1.2 | 0 | true | 9,376,306 | 0 | 2,721 | 1 | 0 | 0 | 9,375,637 | I got it working like this:
currency_style = xlwt.XFStyle()
currency_style.num_format_str = "[$$-409]#,##0.00;-[$$-409]#,##0.00"
sheet.write(row+2, col, val, style=currency_style) | 1 | 0 | 0 | Preformat to currency and two decimal places in python using xlwt for excel | 1 | python,excel,xlwt | 0 | 2012-02-21T10:10:00.000 |
I have a static folder that is managed by apache where images are stored.
I wonder if it's possible by configuring apache to send all files from that folder as downloadable files, not opening them as images inside browser? I suppose I can do it by creating a special view in Flask, but I think it would be nicer if I cou... | 4 | 1 | 0.099668 | 0 | false | 9,378,819 | 1 | 219 | 1 | 0 | 0 | 9,378,664 | You can force the contents to be a downloadable attachment using http headers.
In PHP that would be:
$fileName = 'dummy.jpg';
header("Content-Disposition: attachment; filename=$fileName");
Then, the script dumps the raw contents of the file. | 1 | 0 | 0 | Send image as an attachment in browser | 2 | python,browser,flask | 0 | 2012-02-21T13:46:00.000 |
In order to demonstrate the security feature of Oracle one has to call OCIServerVersion() or OCIServerRelease() when the user session has not yet been established.
While having the database parameter sec_return_server_release_banner = false.
I am using Python cx_Oracle module for this, but I am not sure how to get the ... | 7 | 0 | 0 | 0 | false | 21,155,146 | 0 | 1,064 | 1 | 0 | 0 | 9,389,381 | With-out establishing a connection,. No you can never asking anything. It's like going to Google Page.(Internet Architecture - wether you call it sessionless or session based)
As for Authentical, if no permission are set - Oracle uses a username 'nobody' as a user and thus gives every user a session.
I am a user of Ora... | 1 | 0 | 0 | python cx_oracle and server information | 2 | python,cx-oracle | 0 | 2012-02-22T05:08:00.000 |
I'd like to add a feature to my behind the firewall webapp that exposes and ODBC interface so users can connect with a spreadsheet program to explore our data.
We don't use a RDBMS so I want to emulate the server side of the connection.
I've searched extensively for a library or framework that helps to implement the se... | 1 | 0 | 0 | 0 | false | 9,432,486 | 0 | 59 | 1 | 0 | 0 | 9,432,332 | The server side of ODBC is already done, it is your RDBMS.
ODBC is a client side thing, most implementations are just a bridge between ODBC interface and the native client interface for you-name-your-RDBMS-here.
That is why you will not find anything about the server side of ODBC... :-)
Implementing a RDBMS (even with ... | 1 | 0 | 0 | Are there any libraries (or frameworks) that aid in implementing the server side of ODBC? | 1 | python,odbc | 0 | 2012-02-24T14:26:00.000 |
I am using plone to build my site.
In one page template, I have the <input type="file" name="file"> and this form: <form method="post" action="addintoDb" enctype="multipart/form-data"
The addintoDb is a python script that save my information into db:context.addParam(name=request.name, path=request['file']).
in my db ... | 2 | 1 | 0.197375 | 0 | false | 9,456,924 | 1 | 890 | 1 | 0 | 0 | 9,446,769 | You are not saving the file on the filesystem, but in the Zope object database. You'd have to use python code (not a python script) to open a filepath with the open built-in function to save the data to. | 1 | 0 | 0 | upload file with python script in plone | 1 | python,plone,zope | 0 | 2012-02-25T18:27:00.000 |
I have a handful of servers all connected over WAN links (moderate bandwidth, higher latency) that all need to be able to share info about connected clients. Each client can connect to any of the servers in the 'mesh'. Im looking for some kind of distributed database each server can host and update. It would be impo... | 1 | 0 | 0 | 0 | false | 9,466,181 | 0 | 981 | 1 | 1 | 0 | 9,456,954 | What you describe reminds me of an Apache Cassandra cluster configured so that each machine hosts a copy of the whole dataset and reads and writes succeed when they reach a single node (I never did that, but I think it's possible). Nodes should be able to remain functional when WAN links are down and receive pending up... | 1 | 0 | 0 | Distributed state | 5 | python,database,linux,datastore,distributed-system | 0 | 2012-02-26T20:41:00.000 |
I am playing around with python and thought I would make a simple language learning program... ie: lanuageA | languageB | type of word | synonym | antonym |
basically flash cards...
I have made a crude version using python and json, and have just started playing with sqlite3... Is a database a better way to organize th... | 2 | 0 | 0 | 0 | false | 9,484,859 | 0 | 371 | 2 | 0 | 0 | 9,484,814 | If your data fits in memory and you only require to access elements by key, a dictionary is probably just enough for your needs. | 1 | 0 | 1 | json or sqlite3 for a dictionary | 2 | python,json,sqlite | 0 | 2012-02-28T15:32:00.000 |
I am playing around with python and thought I would make a simple language learning program... ie: lanuageA | languageB | type of word | synonym | antonym |
basically flash cards...
I have made a crude version using python and json, and have just started playing with sqlite3... Is a database a better way to organize th... | 2 | 1 | 1.2 | 0 | true | 9,485,889 | 0 | 371 | 2 | 0 | 0 | 9,484,814 | Who is going to modify your data?
If you plan to only modify the word set yourself (as a developer, not a user of an application), you can use JSON to keep the data on the disk
If you want to allow users of your application to add/edit/remove flashcards, you should use a database (sqlite3 is OK), because otherwise you... | 1 | 0 | 1 | json or sqlite3 for a dictionary | 2 | python,json,sqlite | 0 | 2012-02-28T15:32:00.000 |
I am fetching records from gae model using cursor() and with_cursor() logic as used in paging. but i am not sure how to check that there is no any other record in db that is pointed by cursor. i am fetching these records in chunks within some iterations.when i got my required results in the first iteration then in next... | 0 | 0 | 0 | 0 | false | 9,521,520 | 1 | 550 | 1 | 1 | 0 | 9,521,289 | i am not 100% sure about that but what i used to do is compare the last cursor with the actual cursor and i think i noticed that they were the same so i came to the conclusion that it was the last cursor. | 1 | 0 | 0 | cursor and with_cursor() in GAE | 3 | python,google-app-engine | 0 | 2012-03-01T17:47:00.000 |
I'm new to Django and have only been using sqlite3 as a database engine in Django. Now one of the applications I'm working on is getting pretty big, both in terms of models' complexity and requests/second.
How do database engines supported by Django compare in terms of performance? Any pitfalls in using any of them? An... | 48 | 6 | 1 | 0 | false | 9,540,685 | 1 | 41,120 | 1 | 0 | 0 | 9,540,154 | MySQL and PostgreSQL work best with Django. I would highly suggest that when you choose one that you change your development settings to use it while development (opposed to using sqlite3 in dev mode and a "real" database in prod) as there are subtle behavioral differences that can caused lots of headaches in the futur... | 1 | 0 | 0 | Which database engine to choose for Django app? | 4 | python,database,django,sqlite | 0 | 2012-03-02T20:49:00.000 |
I am trying to think through a script that I need to create. I am most likely going to be using php unless there would be a better language to do this with e.g. python or ror. I only know a little bit of php so this will definitely be a learning experience for me and starting fresh with a different language wouldn't be... | 0 | 0 | 0 | 0 | false | 9,543,194 | 0 | 90 | 1 | 0 | 0 | 9,543,171 | I did this yesterday.
my process was to add a row to a master accounts table, get the auto inc id, use that along with the company name to create the db name. so in my case the db's are
Root_1companyname1
Root_2companyname2
..
Root_ is optional of course.
Ask if you have any questions. | 1 | 0 | 0 | Automate database creation with incremental name? | 1 | php,python,wordpress | 1 | 2012-03-03T03:30:00.000 |
I have a Python Flask app I'm writing, and I'm about to start on the backend. The main part of it involves users POSTing data to the backend, usually a small piece of data every second or so, to later be retrieved by other users. The data will always be retrieved within under an hour, and could be retrieved in as low a... | 3 | 1 | 1.2 | 0 | true | 9,545,480 | 1 | 168 | 1 | 0 | 0 | 9,544,618 | You might look at mongoengine we use it in production with flask(there's an extension) and it has suited our needs well, there's also mongoalchemy which I haven't tried but seems to be decently popular.
The downside to using mongo is that there is no expire automatically, having said that you might take a look at usin... | 1 | 0 | 0 | In need of a light, changing database/storage solution | 1 | python,database,flask | 0 | 2012-03-03T08:17:00.000 |
there's something I'm struggling to understand with SQLAlchamy from it's documentation and tutorials.
I see how to autoload classes from a DB table, and I see how to design a class and create from it (declaratively or using the mapper()) a table that is added to the DB.
My question is how does one write code that bot... | 0 | 0 | 0 | 0 | false | 9,554,925 | 0 | 77 | 1 | 0 | 0 | 9,554,204 | I think you're perhaps over-thinking the situation. If you want to create the database afresh, you normally just call Base.metadata.create_all() or equivalent, and if you don't want to do that, you don't call it.
You could try calling it every time and handling the exception if it goes wrong, assuming that the database... | 1 | 0 | 0 | SQLAlchamy Database Construction & Reuse | 2 | python,database,sqlalchemy | 0 | 2012-03-04T10:41:00.000 |
I'm developing a multi-player game in Python with a Flask frontend, and I'm using it as an opportunity to learn more about the NoSQL way of doing things.
Redis seems to be a good fit for some of the things I need for this app, including storage of server-side sessions and other transient data, e.g. what games are in pr... | 4 | 3 | 1.2 | 0 | true | 9,557,895 | 1 | 532 | 1 | 0 | 0 | 9,557,552 | You should have no problem using an ORM because, in the end, it just stores strings, numbers and other values. So you could have a game in progress, and keep its state in Redis, including the players' IDs from the SQL player table, because the ID is just a unique integer. | 1 | 0 | 0 | Redis and RDBMS coexistence (hopefully cooperation) in Flask applications | 1 | python,nosql,redis,rdbms,flask | 0 | 2012-03-04T18:17:00.000 |
I have a game where each player has a score. I would like to have a global scoreboard where players can compare their scores, see how well they are placed and browse the scoreboard.
Unfortunately I cannot find an efficient way to program this: storing the current player position in the scoreboard means I have to updat... | 0 | 0 | 0 | 0 | false | 9,576,946 | 0 | 857 | 1 | 0 | 0 | 9,576,578 | The ORDER BY clause was made for that and doesn't look so slow. | 1 | 0 | 0 | Scoreboard using Python and SQL | 3 | python,sql | 0 | 2012-03-06T01:20:00.000 |
I have a table address. This table is constantly getting new row inserts, appox 1 row per second. Lets called it process1.
In parallel, I need to iterate over SELECT * from address results inserted till now via process1. This is Process2. It should wait for Process1 to insert new rows if it reaches the end, ie, there a... | 0 | 0 | 1.2 | 0 | true | 9,607,771 | 0 | 112 | 1 | 0 | 0 | 9,607,711 | Add a TIMESTAMP column and select rows with a newer timestamp than the latest processed. | 1 | 0 | 0 | python dynamically select rows from mysql | 1 | python,mysql | 0 | 2012-03-07T19:21:00.000 |
I am trying rewrite a simple Rails application I made a while ago with cherrypy and Python3. So far I have been unable to find a Python replacement for ActiveRecord (the persistence part of the application). Most of the recommendations I've found on StackOverflow have been for SQL Alchemy. I looked into this and it ... | 2 | 0 | 0 | 0 | false | 9,832,722 | 1 | 456 | 2 | 0 | 0 | 9,678,989 | I have developed a transparent persistent storage system for python this is currently in an alpha-stage. Once you create a persistent object, you can access and modify its attributes using standard python syntax (obj.x=3;) and the persistence is done behind the scenes (by overloading the setattr methods, etc.). Conta... | 1 | 0 | 0 | Persistence for a python (cherrypy) web application? | 3 | python,web-applications,persistence,cherrypy | 0 | 2012-03-13T05:49:00.000 |
I am trying rewrite a simple Rails application I made a while ago with cherrypy and Python3. So far I have been unable to find a Python replacement for ActiveRecord (the persistence part of the application). Most of the recommendations I've found on StackOverflow have been for SQL Alchemy. I looked into this and it ... | 2 | 1 | 0.066568 | 0 | false | 9,679,132 | 1 | 456 | 2 | 0 | 0 | 9,678,989 | SQL Alchemy is a industrial standard is no choice. But it's not as difficult as it seems at first sight | 1 | 0 | 0 | Persistence for a python (cherrypy) web application? | 3 | python,web-applications,persistence,cherrypy | 0 | 2012-03-13T05:49:00.000 |
I seem to remember reading somewhere that google app engine automatically caches the results of very frequent queries into memory so that they are retrieved faster.
Is this correct?
If so, is there still a charge for datastore reads on these queries? | 3 | 1 | 0.066568 | 0 | false | 9,689,883 | 1 | 1,313 | 2 | 1 | 0 | 9,689,588 | I think that app engine does not cache anything for you. While it could be that, internally, it caches some things for a split second, I don't think you should rely on that.
I think you will be charged the normal number of read operations for every entity you read from every query. | 1 | 0 | 0 | Does app engine automatically cache frequent queries? | 3 | python,google-app-engine,memcached,bigtable | 0 | 2012-03-13T18:06:00.000 |
I seem to remember reading somewhere that google app engine automatically caches the results of very frequent queries into memory so that they are retrieved faster.
Is this correct?
If so, is there still a charge for datastore reads on these queries? | 3 | 1 | 0.066568 | 0 | false | 9,690,080 | 1 | 1,313 | 2 | 1 | 0 | 9,689,588 | No, it doesn't. However depending on what framework you use for access to the datastore, memcache will be used. Are you developing in java or python? On the java side, Objectify will cache GETs automatically but not Queries. Keep in mind that there is a big difference in terms of performance and cachability between get... | 1 | 0 | 0 | Does app engine automatically cache frequent queries? | 3 | python,google-app-engine,memcached,bigtable | 0 | 2012-03-13T18:06:00.000 |
I have a spreadsheet with about 1.7m lines, totalling 1 GB, and need to perform various queries on it. Being most comfortable with Python, my first approach was to hack together a bunch of dictionaries keyed in a way that would facilitate the queries I was trying to make. E.g. if I needed to be able to access everyone ... | 2 | 4 | 1.2 | 0 | true | 9,695,095 | 0 | 572 | 1 | 0 | 0 | 9,694,967 | sqlite3 is too slow, and I need something more heavyweight
First, sqlite3 is fast, sometime faster than MySQL
Second, you have to use index, put a compound index in (date1, date2, name) will speed thing up significantly | 1 | 0 | 0 | Querying (pretty) big relational data in Python in a reasonable amount of time? | 3 | python,database,sqlite,indexing,bigdata | 0 | 2012-03-14T02:05:00.000 |
i am new in python and i want to read office 2010 excel file without changing its style. Currently its working fine but changing date format. i want it as they are in excel file. | 0 | 1 | 0.197375 | 0 | false | 9,757,506 | 0 | 719 | 1 | 0 | 0 | 9,757,361 | i want it as they are in excel file.
A date is recorded in an Excel file (both 2007+ XLSX files and earlier XLS files) as a floating point number of days (and fraction thereof) since some date in 1899/1900 or 1904. Only the "number format" that is recorded against the cell can be used to distinguish whether a date or ... | 1 | 0 | 1 | How to read office 2010 excelfile using openpyxl without changing style | 1 | python,openpyxl | 0 | 2012-03-18T09:49:00.000 |
I'm creating python app using relatively big SQL database (250k rows). Application needs GUI where most important part of it would be to present results of SQL queries.
So I'm looking for a best way to quickly present data in tables in GUI.
Most preferably I'd be using wx - as it has seamless connection to main applica... | 1 | 1 | 0.197375 | 0 | false | 9,771,997 | 0 | 420 | 1 | 0 | 0 | 9,762,841 | You could use wx.grid or one of the ListCtrls. There's an example of a grid with 100 million cells in the wxPython demo that you could use for guidance on projects with lots of information. For ListCtrls, you would want to use a Virtual ListCtrl using the wx.LC_VIRTUAL flag. There's an example of that in the demo as we... | 1 | 1 | 0 | Most seamless way to present data in gui | 1 | python,sqlite,user-interface,wxpython,wxwidgets | 0 | 2012-03-18T22:22:00.000 |
>>> _cursor.execute("select * from bitter.test where id > 34")
1L
>>> _cursor.fetchall()
({'priority': 1L, 'default': 0, 'id': 35L, 'name': 'chinanet'},)
>>> _cursor.execute("select * from bitter.test where id > 34")
1L
>>> _cursor.fetchall()
({'priority': 1L, 'default': 0, 'id': 35L, 'name'... | 2 | 2 | 1.2 | 0 | true | 9,765,239 | 0 | 677 | 1 | 0 | 0 | 9,764,963 | I guess you're using InnoDB. This is default for an InnoDB transaction.
REPEATABLE READ
This is the default isolation level for InnoDB. For consistent reads,
there is an important difference from the READ COMMITTED isolation
level: All consistent reads within the same transaction read the
snapshot established by... | 1 | 0 | 0 | cursor fetch wrong records from mysql | 2 | python,mysql-python | 0 | 2012-03-19T04:13:00.000 |
Is there a new way to connect to MySQL from Python with Mac OS X Lion (10.7.x)?
All the material I can find only seems to support Snow Leopard (10.6) and older.
I've tried installing pyodbc, but can't get the odbc drivers to register with the operating system (maybe a 10.6 -> 10.7 compatibility issue?) | 1 | 0 | 1.2 | 0 | true | 9,792,010 | 0 | 391 | 1 | 0 | 0 | 9,791,587 | Turns out the newest MySql_python worked great. just had to run sudo python setup.py install | 1 | 0 | 0 | Python MySQL On Mac OS X Lion | 2 | python,mysql,macos | 0 | 2012-03-20T17:09:00.000 |
Are there any alternative to xlrd, xlwt and xlutils for handling MS Excel in python? As far as I know, their licensing does not allow it to be used for commercial purpose and I was wondering if there are any alternative to that other than using COM. | 2 | 1 | 0.099668 | 0 | false | 10,435,892 | 0 | 3,189 | 1 | 0 | 0 | 9,805,426 | openpyxl is definitely worth a test drive, but keep in mind that it support only XLSX files,
while xlrd/xlwr support only XLS files. | 1 | 0 | 0 | Alternative to xlrd, xlwt and xlutils in python | 2 | python | 0 | 2012-03-21T13:17:00.000 |
I am writing a music catalogue application with PyQt using to display GUI. I have a problem about choosing database engine. There are simply too many options.
I can use:
-PyQt build-in QSql
-sqlite3
-SQLAlchemy (Elixir)
-SQLObject
-Python DB-API
Probably there are far more options, this list is what I got from google (... | 2 | 1 | 0.099668 | 0 | false | 9,860,250 | 0 | 475 | 2 | 0 | 0 | 9,859,343 | You would be better off using an ORM (Object Relational Library) Library that would allow you to design in an OOP way, and let it take care of the database for you. There are many advantages; but one of the greatest is that you won't be tied to a database engine. You can use sqlite for development, and keep your projec... | 1 | 0 | 0 | Databases and python | 2 | python,database,sqlite,sqlalchemy | 0 | 2012-03-25T10:09:00.000 |
I am writing a music catalogue application with PyQt using to display GUI. I have a problem about choosing database engine. There are simply too many options.
I can use:
-PyQt build-in QSql
-sqlite3
-SQLAlchemy (Elixir)
-SQLObject
-Python DB-API
Probably there are far more options, this list is what I got from google (... | 2 | 4 | 0.379949 | 0 | false | 9,859,423 | 0 | 475 | 2 | 0 | 0 | 9,859,343 | SQLite3 has the advantage of shipping with Python, so it doesn't require any installation. It has a number of nice features (easy-of-use, portability, ACID, storage in a single file, and it is reasonably fast).
SQLite makes a good starting-off point. Python's DB API assures a consistent interface to all the popular... | 1 | 0 | 0 | Databases and python | 2 | python,database,sqlite,sqlalchemy | 0 | 2012-03-25T10:09:00.000 |
I have a small issue(for lack of a better word) with MySQL db. I am using Python.
So I have this table in which rows are inserted regularly. As regularly as 1 row /sec.
I run two Python scripts together. One that simulates the insertion at 1 row/sec. I have also turned autocommit off and explicitly commit after some nu... | 2 | 1 | 1.2 | 0 | true | 9,868,793 | 0 | 392 | 2 | 0 | 0 | 9,866,319 | If autocommit is turned off in the reader as well, then it will be doing the reads inside a transaction and thus not seeing the writes the other script is doing. | 1 | 0 | 0 | Python MySQL- Queries are being unexpectedly cached | 3 | python,mysql | 0 | 2012-03-26T03:37:00.000 |
I have a small issue(for lack of a better word) with MySQL db. I am using Python.
So I have this table in which rows are inserted regularly. As regularly as 1 row /sec.
I run two Python scripts together. One that simulates the insertion at 1 row/sec. I have also turned autocommit off and explicitly commit after some nu... | 2 | 0 | 0 | 0 | false | 9,867,231 | 0 | 392 | 2 | 0 | 0 | 9,866,319 | My guess is that either the reader or writer (most likely the writer) is operating inside a transaction which hasn't been committed. Try ensuring that the writer is committing after each write, and try a ROLLBACK from the reader to make sure that it isn't inside a transaction either. | 1 | 0 | 0 | Python MySQL- Queries are being unexpectedly cached | 3 | python,mysql | 0 | 2012-03-26T03:37:00.000 |
I have several Shelve i.e. .db files that I wish to merge together into one single database.
The only method I could think of was to iterate through each database rewriting each iteration to the new database, but this takes too long.
Is there a better way to do this? | 0 | 0 | 0 | 0 | false | 9,915,108 | 0 | 320 | 1 | 0 | 0 | 9,915,062 | Shelves are mappings, and mappings have an update() method. | 1 | 0 | 0 | How can I merge Shelve files/databases? | 1 | python,database,shelve | 0 | 2012-03-28T20:20:00.000 |
I have some *.xls (excel 2003) files， and I want to convert those files into xlsx (excel 2007).
I use the uno python package, when I save the documents,
I can set the Filter name: MS Excel 97
But there is no Filter name like 'MS Excel 2007',
How can set the the filter name to convert xls to xlsx ? | 43 | 0 | 0 | 0 | false | 67,111,357 | 0 | 99,140 | 1 | 0 | 0 | 9,918,646 | This is a solution for MacOS with old xls files (e.g. Excel 97 2004).
The best way I found to deal with this format, if excel is not an option, is to open the file in openoffice and save it to another format as csv files. | 1 | 0 | 0 | how to convert xls to xlsx | 17 | python,uno | 0 | 2012-03-29T03:20:00.000 |
I have to create Excel spreadsheet with nice format from Python. I thought of doing it by:
I start in Excel as it is very easy to format: I write in Excel the
model I want, with the good format
I read this from Python
I create from Python an Excel spreadsheet with the same format
In the end, the purpose is to create... | 3 | 0 | 0 | 0 | false | 10,001,613 | 0 | 4,524 | 1 | 0 | 0 | 9,920,935 | You said:
formatting with xlwt takes a lot of time
and
it is quite awkward to use
Perhaps you are not using easyxf? If so, check out the tutorial that you can access via www.python-excel.org, and have a look at examples/xlwt_easyxf_simple_demo.py in your xlwt installation. | 1 | 0 | 0 | Easily write formatted Excel from Python: Start with Excel formatted, use it in Python, and regenerate Excel from Python | 2 | python,excel,format,xlwt | 0 | 2012-03-29T07:32:00.000 |
I want to ask you what programming language I should use to develop a horizontally scalable database. I don't care too much about performance.
Currently, I only know PHP and Python, but I wonder if Python is good for scalability.
Or is this even possible in Python?
The reasons I don't use an existing system is, I need ... | 0 | 1 | 1.2 | 0 | true | 9,927,520 | 0 | 284 | 3 | 0 | 0 | 9,927,372 | The deveopment of a scalable database is language independent, i cannot say much about PHP, but i can tell you good things about Python, it's easy to read, easy to learn, etc. In my opinion it makes the code much cleaner than other languges. | 1 | 0 | 0 | Programming a scalable database | 4 | python,programming-languages,database-programming | 0 | 2012-03-29T14:25:00.000 |
I want to ask you what programming language I should use to develop a horizontally scalable database. I don't care too much about performance.
Currently, I only know PHP and Python, but I wonder if Python is good for scalability.
Or is this even possible in Python?
The reasons I don't use an existing system is, I need ... | 0 | 0 | 0 | 0 | false | 9,927,811 | 0 | 284 | 3 | 0 | 0 | 9,927,372 | Since this is clearly a request for "opinion", I thought I'd offer my $.02
We looked at MongoDB 12-months ago, and started to really like it...but for one issue. MongoDB limits the largest database to amount of physical RAM installed on the MongoDB server. For our tests, this meant we were limited to 4 GB databases. Th... | 1 | 0 | 0 | Programming a scalable database | 4 | python,programming-languages,database-programming | 0 | 2012-03-29T14:25:00.000 |
I want to ask you what programming language I should use to develop a horizontally scalable database. I don't care too much about performance.
Currently, I only know PHP and Python, but I wonder if Python is good for scalability.
Or is this even possible in Python?
The reasons I don't use an existing system is, I need ... | 0 | 0 | 0 | 0 | false | 9,927,445 | 0 | 284 | 3 | 0 | 0 | 9,927,372 | Betweent PHP & Python, definitely Python. Where I work, the entire system is written in Python and it scales quite well.
p.s.: Do take a look at Mongo Db though. | 1 | 0 | 0 | Programming a scalable database | 4 | python,programming-languages,database-programming | 0 | 2012-03-29T14:25:00.000 |
I have a web application build in Django + Python that interact with web services (written in JAVA).
Now all the database management part is done by web-services i.e. all CRUD operations to actual database is done by web-services.
Now i have to track all User Activities done on my website in some log table.
Like If Us... | 0 | 0 | 0 | 0 | false | 9,942,327 | 1 | 2,693 | 2 | 0 | 0 | 9,942,206 | In your log table you can have various columns, including:
user_id (the user that did the action)
activity_type (the type of activity, such as view or commented_on)
object_id (the actual object that it concerns, such as the Article or Media)
object_type (the type of object; this can be used later, in combination with ... | 1 | 0 | 0 | How to store all user activites in a website..? | 5 | java,python,django,postgresql,user-activity | 0 | 2012-03-30T11:39:00.000 |
I have a web application build in Django + Python that interact with web services (written in JAVA).
Now all the database management part is done by web-services i.e. all CRUD operations to actual database is done by web-services.
Now i have to track all User Activities done on my website in some log table.
Like If Us... | 0 | 1 | 1.2 | 0 | true | 9,942,819 | 1 | 2,693 | 2 | 0 | 0 | 9,942,206 | So, you have UI <-> Web Services <-> DB
Since the web services talk to the DB, and the web services contain the business logic (i.e. I guess you validate stuff there, create your queries and execute them), then the best place to 'log' activities is in the services themselves.
IMO, logging PostgreSQL transactions is a d... | 1 | 0 | 0 | How to store all user activites in a website..? | 5 | java,python,django,postgresql,user-activity | 0 | 2012-03-30T11:39:00.000 |
I'm trying to implement an script that reads the content(files and folders) of a certain directory and writes it in a database. My goal is create an software that allows me to organize those files and folders relating description and tags to them, without affecting the correspondig physical files in the disk.
But for n... | 0 | 0 | 0 | 0 | false | 9,978,197 | 0 | 114 | 1 | 0 | 0 | 9,977,888 | You can't.
It looks that there is no way to identify the file: neither by content nor by pathname.
One workaround might be: use path as id (and use them as reference in the DB) and do not use system tools (like mv) to move files but your own script which updates the file system and the database. | 1 | 0 | 0 | How to link a file to a database? | 2 | php,python,database,windows,linux | 0 | 2012-04-02T14:00:00.000 |
I am requesting a web page and want to cache the page data as a raw html string. (First I escaped the data string) I use sqlite3 to save my data on. When I tried give the byte_string in dictionary, or tuple, using placeholders in request, it raise "Programming Error" saying to convert the application to use unicode str... | 0 | 0 | 0 | 0 | false | 9,991,929 | 1 | 241 | 1 | 0 | 0 | 9,991,854 | You should .decode with the correct encoding. In this case Latin 1 or CP1252. »ö« is obviously not 0xf6 in UTF-8 so why should it work? | 1 | 0 | 0 | How to convert a stringbyte(raw html string) to sqlite3 TEXT supporting unicode in Python | 1 | python,unicode,utf-8,sqlite | 0 | 2012-04-03T10:57:00.000 |
Ok so I have a script that connects to a mssql db and i need to run as a service which I have already accomplished but when I run it as a service it overrides my credentials that I have put in when i connect to the db with the ad computer account.
It runs perfect when i run it on its own and not as a service.
My Connec... | 4 | 2 | 0.197375 | 0 | false | 10,001,004 | 0 | 7,735 | 1 | 0 | 0 | 10,000,256 | In the last project I worked on, I found that DRIVER={SQL Server};SERVER=SERVERNAME;DATABASE=DBName is sufficient to initiate a db connection in trusted mode.
If it still does not work, it is probably either
1) the account DEEPTHOUGHT on mssql server is not set up properly.
2) the runAs in the service is not set up p... | 1 | 0 | 0 | Failed to Login as 'Domain\ComputerName' pyodbc with py2exe | 2 | python,sql-server,py2exe,pyodbc | 0 | 2012-04-03T19:46:00.000 |
I need a unique datastore key for users authenticated via openid with the python 2.7 runtime for the google apps engine.
Should I use User.federated_identity() or User.federated_provider() + User.federated_identity()?
In other words is User.federated_identity() unique for ALL providers or just one specific provider... | 2 | 2 | 1.2 | 0 | true | 10,023,490 | 1 | 194 | 1 | 1 | 0 | 10,002,209 | User.federated_identity() "Returns the user's OpenID identifier.", which is unique by definition (it's a URL that uniquely identifies the user). | 1 | 0 | 0 | Generating a unique data store key from a federated identity | 1 | python,google-app-engine,authentication | 0 | 2012-04-03T22:13:00.000 |
I'm writing a Oracle of Bacon type website that involves a breadth first search on a very large directed graph (>5 million nodes with an average of perhaps 30 outbound edges each). This is also essentially all the site will do, aside from display a few mostly text pages (how it works, contact info, etc.). I currently h... | 2 | 1 | 1.2 | 0 | true | 10,020,054 | 1 | 214 | 1 | 0 | 0 | 10,017,645 | First up, look at daemon mode of mod_wsgi and don't use embedded mode as then you can control separate to Apache child processes the number of Python WSGI application processes. Secondly, you would be better off putting the memory hungry bits in a separate backend process. You might use XML-RPC or other message queuein... | 1 | 0 | 0 | Maximizing apache server instances with large mod_wsgi application | 1 | python,database,django,apache,mod-wsgi | 1 | 2012-04-04T19:06:00.000 |
I've been doing some HA testing of our database and in my simulation of server death I've found an issue.
My test uses Django and does this:
Connect to the database
Do a query
Pull out the network cord of the server
Do another query
At this point everything hangs indefinitely within the mysql_ping function. As far as... | 2 | 0 | 0 | 0 | false | 10,192,810 | 1 | 181 | 1 | 0 | 0 | 10,018,055 | I would think this would be more inline with setting a read_timeout on your front-facing webserver. Any number of reasons could exist to hold up your django app indefinitely. While you have found one specific case there could be many more (code errors, cache difficulties, etc). | 1 | 0 | 0 | How can I detect total MySQL server death from Python? | 1 | python,django,mysql-python | 0 | 2012-04-04T19:35:00.000 |
I am having a problem and not sure if this is possible at all, so if someone could point me in the right direction.
I need to open a file from a webpage, open it in excel and save the file.
The problem I am running into the file name on the website has a file name ( not an active link ) and then it will have a "downloa... | 2 | 0 | 0 | 0 | false | 10,023,435 | 1 | 1,137 | 1 | 0 | 0 | 10,023,418 | Examine the Content-Disposition header of the response to discover what the server wants you to call the file. | 1 | 0 | 0 | Python File Download | 3 | python | 0 | 2012-04-05T06:05:00.000 |
I am trying to do a parser, that reads several excel files. I need values usually at the bottom of a row where you find a sum of all upper elements. So the cell value is actually "=sum()" or "A5*0.5" lets say... To a user that opens this file with excel it appears like a number, which is fine. But if I try to read thi... | 2 | 0 | 0 | 0 | false | 10,029,868 | 0 | 2,953 | 1 | 0 | 0 | 10,029,641 | As per the link for your question,I have posted above, the author of xlrd says, 'The work is 'in-progress' but is not likely to be available soon as the focus of xlrd lies elsewhere". By this, I assume that there is nothing much you can do about it. Note: this is based on author's comment on Jan, 2011. | 1 | 0 | 0 | how to read formulas with xlrd | 1 | python,excel,xlrd | 0 | 2012-04-05T13:36:00.000 |
Let's say I have Python process 1 on machine 1 and Python process 2 on machine 2. Both processes are the same and process data sent by a load balancer.
Both processes need to interact with a database - in my case Postgres so each process needs to know what database it should talk to, it needs to have the right models o... | 1 | 1 | 0.099668 | 0 | false | 10,045,103 | 0 | 157 | 1 | 0 | 0 | 10,044,862 | If it's db connection information you're interested in, I recently wrote a service for this. Each process has token(s) set in configuration and uses those to query the service for db connection info. The data layer uses that info to create connections, no DSN's are stored. On the server side, you just maintain a dictio... | 1 | 0 | 1 | Any Python solution for having distributed processes interact with relational databases in the most decoupled way possible? | 2 | python,database,distributed-computing | 0 | 2012-04-06T14:25:00.000 |
The documentation for Pandas has numerous examples of best practices for working with data stored in various formats.
However, I am unable to find any good examples for working with databases like MySQL for example.
Can anyone point me to links or give some code snippets of how to convert query results using mysql-pyth... | 97 | 4 | 0.061461 | 0 | false | 27,531,471 | 0 | 123,656 | 1 | 0 | 0 | 10,065,051 | pandas.io.sql.frame_query is deprecated. Use pandas.read_sql instead. | 1 | 0 | 0 | python-pandas and databases like mysql | 13 | python,pandas | 0 | 2012-04-08T18:01:00.000 |
I am developing an application designed for a secretary to use. She has a stack of hundreds of ballot forms which have a number of questions on them, and wishes to input this data into a program to show the total votes for each answer. Each question has a number of answers.
For example:
Q: "Re-elect current president o... | 0 | 5 | 1.2 | 0 | true | 10,066,588 | 1 | 72 | 1 | 0 | 0 | 10,066,573 | You really don't want to implement each question/answer as a separate DB field.
Instead, make a table of questions and a table of answers, and have a field in the answers table (in general, a ForeignKey) to indicate which question a given answer is associated with. | 1 | 0 | 0 | Adding field to SQL table from Django Application | 1 | python,sql,django | 0 | 2012-04-08T21:14:00.000 |
I have to build a web application which uses Python, php and MongoDB.
Python - For offline database populating on my local home machine and then exporting db to VPS. Later I am planning to schedule this job using cron.
PHP - For web scripting.
The VPS I wish to buy supports Python and LAMP Stack but not mongoDB (myho... | 1 | 1 | 0.099668 | 0 | false | 10,074,035 | 0 | 810 | 1 | 0 | 0 | 10,073,934 | If the vps you are looking at restricts the packages you can install, and you need something that they prohibit, I would look for another vps. Both rackspace and amazon a range of instances, and numerous supported os. With either of them you choose your operating system and are free to install whatever you want. | 1 | 0 | 0 | Performance of MongoDB on VPS or cloud service not having mongoDB installed | 2 | php,python,mongodb,vps | 1 | 2012-04-09T13:28:00.000 |
I have a desktop python application whose data backend is a MySQL database, but whose previous database was a network-accessed xml file(s). When it was xml-powered, I had a thread spawned at the launch of the application that would simply check the xml file for changes and whenever the date modified changed (due to any... | 0 | 0 | 0 | 0 | false | 10,091,535 | 0 | 450 | 1 | 0 | 0 | 10,091,108 | As I understand this is not a client-server application, but rather an application that has a common remote storage.
One idea would be to change to web services (this would solve most of your problems on the long run).
Another idea (if you don't want to switch to web) is to refresh periodically the data in your interfa... | 1 | 0 | 0 | Best way to inform user of an SQL Table Update? | 1 | python,mysql,notifications | 0 | 2012-04-10T14:55:00.000 |
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