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My Django app, deployed in mod_wsgi under Apache using Django's standard WSGIHandler, authenticates users via form login on the Django side. So to Apache, the user is anonymous. This makes the Apache access log less useful.
Is there a way to pass the username back through the WSGI wrapper to Apache after handling the r... | 9 | 1 | 0.039979 | 0 | false | 2,244,295 | 1 | 2,209 | 2 | 0 | 0 | 2,244,244 | This probably isn't what you're expecting, but you could use the username in your URL scheme. That way the user will be in the path section of your apache logs.
You'd need to modify your authentication so that auth-required responses are obvious in the apache logs, otherwise when viewing the logs you may attribute unau... | 1 | 0 | 0 | WSGI/Django: pass username back to Apache for access log | 5 | python,django,apache,authentication,mod-wsgi | 0 | 2010-02-11T12:03:00.000 |
My Django app, deployed in mod_wsgi under Apache using Django's standard WSGIHandler, authenticates users via form login on the Django side. So to Apache, the user is anonymous. This makes the Apache access log less useful.
Is there a way to pass the username back through the WSGI wrapper to Apache after handling the r... | 9 | 1 | 0.039979 | 0 | false | 10,406,967 | 1 | 2,209 | 2 | 0 | 0 | 2,244,244 | Correct me if I'm wrong, but what's stopping you from creating some custom middleware that sets a cookie equal to the display name of the current user logged in. This middleware will run on every view, so even though technically the user could spoof his username to display whatever he wants it to display, it'll just be... | 1 | 0 | 0 | WSGI/Django: pass username back to Apache for access log | 5 | python,django,apache,authentication,mod-wsgi | 0 | 2010-02-11T12:03:00.000 |
I am using PostgreSQL 8.4. I really like the new unnest() and array_agg() features; it is about time they realize the dynamic processing potential of their Arrays!
Anyway, I am working on web server back ends that uses long Arrays a lot. Their will be two successive processes which will each occur on a different physic... | 3 | 0 | 0 | 0 | false | 2,277,362 | 0 | 785 | 1 | 0 | 0 | 2,263,132 | I am thinking either listen/notify or something with a cache such as memcache. You would send the key to memcache and have the second python app retrieve it from there. You could even do it with listen/notify... e.g; send the key and notify your second app that the key is in memcache waiting to be retrieved. | 1 | 0 | 0 | Inter-database communications in PostgreSQL | 3 | python,arrays,postgresql,database-connection | 0 | 2010-02-14T22:40:00.000 |
I am developing some Python modules that use a mysql database to insert some data and produce various types of report. I'm doing test driven development and so far I run:
some CREATE / UPDATE / DELETE tests against a temporary database that is thrown away at the end of each test case, and
some report generation tests... | 1 | 1 | 1.2 | 0 | true | 2,273,471 | 0 | 107 | 2 | 0 | 0 | 2,273,414 | I'd do both. Run against the small set first to make sure all the code works, then run against the large dataset for things which need to be tested for time, this would be selects, searches and reports especially. If you are doing inserts or deletes or updates on multiple row sets, I'd test those as well against the la... | 1 | 0 | 0 | Should pre-commit tests use a big data set and fail if queries take too long, or use a small test database? | 2 | python,sql,mysql,tdd,automated-tests | 0 | 2010-02-16T14:06:00.000 |
I am developing some Python modules that use a mysql database to insert some data and produce various types of report. I'm doing test driven development and so far I run:
some CREATE / UPDATE / DELETE tests against a temporary database that is thrown away at the end of each test case, and
some report generation tests... | 1 | 1 | 0.099668 | 0 | false | 2,273,476 | 0 | 107 | 2 | 0 | 0 | 2,273,414 | The problem with testing against real data is that it contains lots of duplicate values, and not enough edge cases. It is also difficult to know what the expected values ought to be (especially if your live database is very big). Oh, and depending on what the live application does, it can be illegal to use the data ... | 1 | 0 | 0 | Should pre-commit tests use a big data set and fail if queries take too long, or use a small test database? | 2 | python,sql,mysql,tdd,automated-tests | 0 | 2010-02-16T14:06:00.000 |
I'm going to write my first non-Access project, and I need advice on choosing the platform. I will be installing it on multiple friends' and family's computers, so (since I'm sure many, many platforms would suffice just fine for my app), my highest priority has two parts: 1) ease of install for the non-technical user a... | 0 | 1 | 0.039979 | 0 | false | 2,282,470 | 1 | 594 | 2 | 0 | 0 | 2,282,360 | The largest issue I can think of is the need to install an interpreter.
With Java, a lot of people will already have that interpreter installed, although you won't necessarily know which version. It may be wise to include the installer for Java with the program.
With Python, you're going to have to install the interpr... | 1 | 0 | 0 | Help for novice choosing between Java and Python for app with sql db | 5 | java,python | 0 | 2010-02-17T16:20:00.000 |
I'm going to write my first non-Access project, and I need advice on choosing the platform. I will be installing it on multiple friends' and family's computers, so (since I'm sure many, many platforms would suffice just fine for my app), my highest priority has two parts: 1) ease of install for the non-technical user a... | 0 | 1 | 1.2 | 0 | true | 2,283,347 | 1 | 594 | 2 | 0 | 0 | 2,282,360 | If you're going to install only (or mostly) on Windows, I'd go with .Net.
If you have experience with C++, then C# would be natural to you, but if you're comfortable with VBA, you can try VB.NET, but if you prefer Python, then there is IronPython or can give a try to IronRuby, but the best of all is you can mix them a... | 1 | 0 | 0 | Help for novice choosing between Java and Python for app with sql db | 5 | java,python | 0 | 2010-02-17T16:20:00.000 |
How do I completely reset my Django (1.2 alpha) DB (dropping all tables, rather than just clearing them)?
manage.py flush does too little (won't work if there are schema changes) and manage.py reset requires me to specify all apps (and appears to take a format that is different from just " ".join(INSTALLED_APPS)). I ca... | 20 | 0 | 0 | 0 | false | 2,289,931 | 1 | 24,412 | 3 | 0 | 0 | 2,289,187 | Hm, maybe you lie to manage.py, pretending to make fixtures, but only to look for apps:
apps=$(python manage.py makefixture 2>&1 | egrep -v '(^Error|^django)'|awk -F . '{print $2}'|uniq); for i in $apps; do python manage.py sqlreset $i; done| grep DROP
That prints out a list of DROP TABLE statements for all apps tabl... | 1 | 0 | 0 | Complete django DB reset | 7 | python,django | 0 | 2010-02-18T14:16:00.000 |
How do I completely reset my Django (1.2 alpha) DB (dropping all tables, rather than just clearing them)?
manage.py flush does too little (won't work if there are schema changes) and manage.py reset requires me to specify all apps (and appears to take a format that is different from just " ".join(INSTALLED_APPS)). I ca... | 20 | 0 | 0 | 0 | false | 2,289,445 | 1 | 24,412 | 3 | 0 | 0 | 2,289,187 | Just assign a new database and drop this db from the db console. Seems to me to be the simplest. | 1 | 0 | 0 | Complete django DB reset | 7 | python,django | 0 | 2010-02-18T14:16:00.000 |
How do I completely reset my Django (1.2 alpha) DB (dropping all tables, rather than just clearing them)?
manage.py flush does too little (won't work if there are schema changes) and manage.py reset requires me to specify all apps (and appears to take a format that is different from just " ".join(INSTALLED_APPS)). I ca... | 20 | -2 | -0.057081 | 0 | false | 2,289,727 | 1 | 24,412 | 3 | 0 | 0 | 2,289,187 | take a look at reset command in django's code, and write your own which drops/creates DB first. | 1 | 0 | 0 | Complete django DB reset | 7 | python,django | 0 | 2010-02-18T14:16:00.000 |
i'm using Python with MySQL and Django. I keep seeing this error and I can't figure out where the exception is being thrown:
Exception _mysql_exceptions.ProgrammingError: (2014, "Commands out of sync; you can't run this command now") in <bound method Cursor.__del__ of <MySQLdb.cursors.Cursor object at 0x20108150>> ig... | 8 | 0 | 0 | 0 | false | 55,394,190 | 1 | 6,125 | 3 | 0 | 0 | 2,291,714 | The exceptions in object destructors (__del__) are ignored, which this message indicates. If you execute some MySQL command without fetching results from the cursor (e.g. 'create procedure' or 'insert') then the exception is unnoticed until the cursor is destroyed.
If you want to raise and catch an exception, call expl... | 1 | 0 | 0 | Who is throwing (and catching) this MySQL Exception? | 5 | python,mysql,django,exception | 0 | 2010-02-18T19:50:00.000 |
i'm using Python with MySQL and Django. I keep seeing this error and I can't figure out where the exception is being thrown:
Exception _mysql_exceptions.ProgrammingError: (2014, "Commands out of sync; you can't run this command now") in <bound method Cursor.__del__ of <MySQLdb.cursors.Cursor object at 0x20108150>> ig... | 8 | 2 | 0.07983 | 0 | false | 2,300,154 | 1 | 6,125 | 3 | 0 | 0 | 2,291,714 | After printing out a bunch of stuff and debugging, I figured out the problem I think. One of the libraries that I used didn't close the connection or the cursor. But this problem only shows up if I iterate through a large amount of data. The problem is also very intermittent and I still don't know who's throwing the... | 1 | 0 | 0 | Who is throwing (and catching) this MySQL Exception? | 5 | python,mysql,django,exception | 0 | 2010-02-18T19:50:00.000 |
i'm using Python with MySQL and Django. I keep seeing this error and I can't figure out where the exception is being thrown:
Exception _mysql_exceptions.ProgrammingError: (2014, "Commands out of sync; you can't run this command now") in <bound method Cursor.__del__ of <MySQLdb.cursors.Cursor object at 0x20108150>> ig... | 8 | 2 | 0.07983 | 0 | false | 2,292,145 | 1 | 6,125 | 3 | 0 | 0 | 2,291,714 | I believe this error can occur if you are using the same connection/cursor from multiple threads.
However, I dont think the creators of Django has made such a mistake, but if you are doing something by yourself it can easily happen. | 1 | 0 | 0 | Who is throwing (and catching) this MySQL Exception? | 5 | python,mysql,django,exception | 0 | 2010-02-18T19:50:00.000 |
I'm planning on building a Django log-viewing app with powerful filters. I'd like to enable the user to finely filter the results with some custom (possibly DB-specific) SELECT queries.
However, I dislike giving the user write access to the database. Is there a way to make sure a query doesn't change anything in the da... | 2 | 1 | 0.099668 | 0 | false | 2,305,359 | 1 | 543 | 2 | 0 | 0 | 2,305,353 | Create and use non-modifiable views. | 1 | 0 | 0 | How can I limit an SQL query to be nondestructive? | 2 | python,sql,django,security,sql-injection | 0 | 2010-02-21T08:48:00.000 |
I'm planning on building a Django log-viewing app with powerful filters. I'd like to enable the user to finely filter the results with some custom (possibly DB-specific) SELECT queries.
However, I dislike giving the user write access to the database. Is there a way to make sure a query doesn't change anything in the da... | 2 | 14 | 1.2 | 0 | true | 2,305,379 | 1 | 543 | 2 | 0 | 0 | 2,305,353 | Connect with a user that has only been granted SELECT permissions. Situations like this is why permissions exist in the first place. | 1 | 0 | 0 | How can I limit an SQL query to be nondestructive? | 2 | python,sql,django,security,sql-injection | 0 | 2010-02-21T08:48:00.000 |
Quick question: is it a good idea to use sqlite while developing a Django project, and use MySQL on the production server? | 20 | 24 | 1.2 | 0 | true | 2,306,070 | 1 | 4,303 | 4 | 0 | 0 | 2,306,048 | I'd highly recommend using the same database backend in production as in development, and all stages in between. Django will abstract the database stuff, but having different environments will leave you open to horrible internationalisation, configuration issues, and nasty tiny inconsistencies that won't even show up u... | 1 | 0 | 0 | Django: sqlite for dev, mysql for prod? | 6 | python,mysql,django,sqlite,dev-to-production | 0 | 2010-02-21T13:45:00.000 |
Quick question: is it a good idea to use sqlite while developing a Django project, and use MySQL on the production server? | 20 | 7 | 1 | 0 | false | 9,401,789 | 1 | 4,303 | 4 | 0 | 0 | 2,306,048 | Use the same database in all environments.
As much as the ORM tries to abstract the differences between databases, there will always be certain features that behave differently based on the database. Database portability is a complete myth.
Plus, it seems pretty insane to test and develop against code paths that you w... | 1 | 0 | 0 | Django: sqlite for dev, mysql for prod? | 6 | python,mysql,django,sqlite,dev-to-production | 0 | 2010-02-21T13:45:00.000 |
Quick question: is it a good idea to use sqlite while developing a Django project, and use MySQL on the production server? | 20 | 3 | 0.099668 | 0 | false | 2,306,069 | 1 | 4,303 | 4 | 0 | 0 | 2,306,048 | In short, no; unless you want to unnecessarily double development time. | 1 | 0 | 0 | Django: sqlite for dev, mysql for prod? | 6 | python,mysql,django,sqlite,dev-to-production | 0 | 2010-02-21T13:45:00.000 |
Quick question: is it a good idea to use sqlite while developing a Django project, and use MySQL on the production server? | 20 | 3 | 0.099668 | 0 | false | 12,684,980 | 1 | 4,303 | 4 | 0 | 0 | 2,306,048 | Just made this major mistake starting off with sqlite and when i try to deploy on production server with mysql, things didn't work as smooth as i expected. I tried dumpdata/loaddata with various switches but somehow keep getting errors thrown one after another. Do yourself a big favor and use the same db for both produ... | 1 | 0 | 0 | Django: sqlite for dev, mysql for prod? | 6 | python,mysql,django,sqlite,dev-to-production | 0 | 2010-02-21T13:45:00.000 |
Is there another way to connect to a MySQL database with what came included in the version of Python (2.5.1) that is bundled with Mac OS 10.5.x? I unfortunately cannot add the the MySQLdb module to the client machines I am working with...I need to work with the stock version of Python that shipped with Leopard. | 3 | 1 | 0.049958 | 0 | false | 9,170,459 | 0 | 3,698 | 1 | 0 | 0 | 2,313,307 | If the problem is the inability, as so many people have mentioned, that the msqldb module is a problem a simpler way is
1. install the mysql db
2. install the pyodbc module
3. Load and configure the odbc mysql driver
4. perform sql manipulations with pyodbc, which is very mature and full functional.
hope this helps | 1 | 0 | 0 | Python: Access a MySQL db without MySQLdb module | 4 | python,mysql,macos | 0 | 2010-02-22T18:54:00.000 |
What is the best way to access sql server from python is it DB-API ?
Also could someone provide a such code using the DB-API how to connect to sql server from python and excute query ? | 26 | 1 | 0.049958 | 0 | false | 2,314,282 | 0 | 28,195 | 1 | 0 | 0 | 2,314,178 | ODBC + freetds + a python wrapper library for ODBC. | 1 | 0 | 0 | Python & sql server | 4 | python,sql,sql-server | 0 | 2010-02-22T21:04:00.000 |
I'm seeking a way to let the python logger module to log to database and falls back to file system when the db is down.
So basically 2 things: How to let the logger log to database and how to make it fall to file logging when the db is down. | 48 | 2 | 0.07983 | 0 | false | 46,617,613 | 0 | 48,780 | 1 | 0 | 0 | 2,314,307 | Old question, but dropping this for others. If you want to use python logging, you can add two handlers. One for writing to file, a rotating file handler. This is robust, and can be done regardless if the dB is up or not.
The other one can write to another service/module, like a pymongo integration.
Look up logging.c... | 1 | 0 | 0 | python logging to database | 5 | python,database,logging | 0 | 2010-02-22T21:22:00.000 |
I am developing a Python web app using sqlalchemy to communicate with mysql database. So far I have mostly been using sqlalchemy's ORM layer to speak with the database. The greatest benefit to me of ORM has been the speed of development, not having to write all these sql queries and then map them to models.
Recently, h... | 4 | 3 | 1.2 | 0 | true | 2,338,360 | 0 | 1,754 | 1 | 0 | 0 | 2,330,278 | SQLAlchemy doesn't have any good way to convert inserts, updates and deletes to stored procedure calls. It probably wouldn't be that hard to add the capability to have instead_{update,insert,delete} extensions on mappers, but no one has bothered yet. I consider the requirement to have simple DML statements go through s... | 1 | 0 | 0 | Keeping ORM with stored procedures | 1 | python,mysql,database,stored-procedures,sqlalchemy | 0 | 2010-02-24T22:51:00.000 |
Here is the scenario. In your function you're executing statements using a cursor, but one of them fails and an exception is thrown. Your program exits out of the function before closing the cursor it was working with. Will the cursor float around taking up space? Do I have to close the cursor?
Additionally, the Py... | 48 | 13 | 1 | 0 | false | 2,330,380 | 0 | 27,863 | 3 | 0 | 0 | 2,330,344 | You're not obliged to call close() on the cursor; it can be garbage collected like any other object.
But even if waiting for garbage collection sounds OK, I think it would be good style still to ensure that a resource such as a database cursor gets closed whether or not there is an exception. | 1 | 0 | 0 | In Python with sqlite is it necessary to close a cursor? | 8 | python,sqlite | 0 | 2010-02-24T23:02:00.000 |
Here is the scenario. In your function you're executing statements using a cursor, but one of them fails and an exception is thrown. Your program exits out of the function before closing the cursor it was working with. Will the cursor float around taking up space? Do I have to close the cursor?
Additionally, the Py... | 48 | 7 | 1 | 0 | false | 2,416,354 | 0 | 27,863 | 3 | 0 | 0 | 2,330,344 | I haven't seen any effect for the sqlite3.Cursor.close() operation yet.
After closing, you can still call fetch(all|one|many) which will return the remaining results from the previous execute statement. Even running Cursor.execute() still works ... | 1 | 0 | 0 | In Python with sqlite is it necessary to close a cursor? | 8 | python,sqlite | 0 | 2010-02-24T23:02:00.000 |
Here is the scenario. In your function you're executing statements using a cursor, but one of them fails and an exception is thrown. Your program exits out of the function before closing the cursor it was working with. Will the cursor float around taking up space? Do I have to close the cursor?
Additionally, the Py... | 48 | 0 | 0 | 0 | false | 71,683,829 | 0 | 27,863 | 3 | 0 | 0 | 2,330,344 | Yes, we should close our cursor. I once encountered an error when I used my cursor to configure my connection object: 'PRAGMA synchronous=off' and 'PRAGMA journal_mode=off' for faster insertion. Once I closed the cursor, the error went away. I forgot what type of error I encountered. | 1 | 0 | 0 | In Python with sqlite is it necessary to close a cursor? | 8 | python,sqlite | 0 | 2010-02-24T23:02:00.000 |
I'm writing a python script to select, insert, update, and delete data in SimpleDB.
I've been using the simpledb module written by sixapart so far, and it's working pretty well.
I've found one potential bug/feature that is problematic for me when running select queries with "limit", and I'm thinking of trying it with t... | 4 | 3 | 1.2 | 0 | true | 2,336,902 | 0 | 833 | 1 | 0 | 0 | 2,336,822 | I've found boto to be effective and straight forward and I've never had any trouble with queries with limits. Although I've never used the sixapart module. | 1 | 0 | 0 | What's the best module to access SimpleDB in python? | 1 | python,amazon-simpledb | 0 | 2010-02-25T19:10:00.000 |
SQLAlchemy seems really heavyweight if all I use is MySQL.
Why are convincing reasons for/against the use of SQLAlchemy in an application that only uses MySQL. | 3 | 4 | 0.26052 | 0 | false | 2,359,697 | 0 | 275 | 3 | 0 | 0 | 2,358,822 | I don't think performance should be much of a factor in your choice. The layer that an ORM adds will be insignificant compared to the speed of the database. Databases always end up being a bottleneck.
Using an ORM may allow you to develop faster with less bugs. You can still access the DB directly if you have a query t... | 1 | 0 | 0 | If I'm only planning to use MySQL, and if speed is a priority, is there any convincing reason to use SQLAlchemy? | 3 | python,mysql,sqlalchemy,pylons | 0 | 2010-03-01T20:24:00.000 |
SQLAlchemy seems really heavyweight if all I use is MySQL.
Why are convincing reasons for/against the use of SQLAlchemy in an application that only uses MySQL. | 3 | 0 | 0 | 0 | false | 2,359,777 | 0 | 275 | 3 | 0 | 0 | 2,358,822 | sqlalchemy provides more than just an orm, you can select/insert/update/delete from table objects, join them etc.... the benefit of using those things over building strings with sql in them is guarding against sql injection attacks for one. You also get some decent connection management that you don't have to write you... | 1 | 0 | 0 | If I'm only planning to use MySQL, and if speed is a priority, is there any convincing reason to use SQLAlchemy? | 3 | python,mysql,sqlalchemy,pylons | 0 | 2010-03-01T20:24:00.000 |
SQLAlchemy seems really heavyweight if all I use is MySQL.
Why are convincing reasons for/against the use of SQLAlchemy in an application that only uses MySQL. | 3 | 7 | 1.2 | 0 | true | 2,358,852 | 0 | 275 | 3 | 0 | 0 | 2,358,822 | ORM means that your OO application actually makes sense when interpreted as the interaction of objects.
No ORM means that you must wallow in the impedance mismatch between SQL and Objects. Working without an ORM means lots of redundant code to map between SQL query result sets, individual SQL statements and objects. ... | 1 | 0 | 0 | If I'm only planning to use MySQL, and if speed is a priority, is there any convincing reason to use SQLAlchemy? | 3 | python,mysql,sqlalchemy,pylons | 0 | 2010-03-01T20:24:00.000 |
I’m trying to bulk insert data to SQL server express database. When doing bcp from Windows XP command prompt, I get the following error:
C:\temp>bcp in -T -f -S
Starting copy...
SQLState = S1000, NativeError = 0
Error = [Microsoft][SQL Native Client]Unexpected EOF encountered in BCP data-file
0 rows copied.
Netwo... | 0 | 1 | 0.066568 | 0 | false | 2,371,680 | 0 | 3,283 | 2 | 1 | 0 | 2,371,645 | This is not a problem with missing EOF, but with EOF that is there and is not expected by bcp.
I am not a bcp tool expert, but it looks like there is some problem with format of your data files. | 1 | 0 | 0 | How to append EOF to file using Perl or Python? | 3 | python,sql-server,perl,bcp | 0 | 2010-03-03T13:35:00.000 |
I’m trying to bulk insert data to SQL server express database. When doing bcp from Windows XP command prompt, I get the following error:
C:\temp>bcp in -T -f -S
Starting copy...
SQLState = S1000, NativeError = 0
Error = [Microsoft][SQL Native Client]Unexpected EOF encountered in BCP data-file
0 rows copied.
Netwo... | 0 | 3 | 1.2 | 0 | true | 2,371,725 | 0 | 3,283 | 2 | 1 | 0 | 2,371,645 | EOF is End Of File. What probably occurred is that the file is not complete; the software expects data, but there is none to be had anymore.
These kinds of things happen when:
the export is interrupted (quit dump software while dumping)
while copying the dumpfile aborting the copy
disk full during dump
these kinds of... | 1 | 0 | 0 | How to append EOF to file using Perl or Python? | 3 | python,sql-server,perl,bcp | 0 | 2010-03-03T13:35:00.000 |
I have a big DBF file (~700MB). I'd like to select only a few lines from it using a python script. I've seen that dbfpy is a nice module that allows to open this type of database, but for now I haven't found any querying capability. Iterating through all the elements from python is simply too slow.
Can I do what I want... | 9 | 2 | 0.132549 | 0 | false | 2,375,874 | 0 | 5,441 | 1 | 0 | 0 | 2,373,086 | Chances are, your performance is more I/O bound than CPU bound. As such, the best way to speed it up is to optimize your search. You probably want to build some kind of index keyed by whatever your search predicate is. | 1 | 0 | 0 | Python: Fast querying in a big dbf (xbase) file | 3 | python,performance,python-3.x,dbf,xbase | 0 | 2010-03-03T16:38:00.000 |
I am able to get the feed from the spreadsheet and worksheet ID. I want to capture the data from each cell.
i.e, I am able to get the feed from the worksheet. Now I need to get data(string type?) from each of the cells to make a comparison and for input.
How exactly can I do that? | 6 | 1 | 0.039979 | 0 | false | 22,048,019 | 0 | 14,275 | 1 | 0 | 0 | 2,377,301 | gspread is probably the fastest way to begin this process, however there are some speed limitations on updating data using gspread from your localhost. If you're moving large sets of data with gspread - for instance moving 20 columns of data over a column, you may want to automate the process using a CRON job. | 1 | 0 | 0 | How to write a python script to manipulate google spreadsheet data | 5 | python,google-sheets,gspread | 0 | 2010-03-04T06:32:00.000 |
1.I have a list of data and a sqlite DB filled with past data along with some stats on each data. I have to do the following operations with them.
Check if each item in the list is present in DB. if no then collect some stats on the new item and add them to DB.
Check if each item in DB is in the list. if no delete it ... | 0 | 0 | 0 | 0 | false | 2,378,530 | 0 | 227 | 1 | 0 | 0 | 2,378,364 | It does not need to check anything, just use INSERT OR IGNORE in first case (just make sure you have corresponding unique fields so INSERT would not create duplicates) and DELETE FROM tbl WHERE data NOT IN ('first item', 'second item', 'third item') in second case.
As it is stated in the official SQLite FAQ, "Threads a... | 1 | 0 | 1 | Need help on python sqlite? | 1 | python,sqlite,multithreading | 0 | 2010-03-04T10:14:00.000 |
Writing an app in Python, and been playing with various ORM setups and straight SQL. All of which are ugly as sin.
I have been looking at ZODB as an object store, and it looks a promising alternative... would you recommend it? What are your experiences, problems, and criticism, particularly regarding developer's perspe... | 43 | 15 | 1 | 0 | false | 2,390,062 | 0 | 10,874 | 3 | 0 | 0 | 2,388,870 | Compared to "any key-value store", the key features for ZODB would be automatic integration of attribute changes with real ACID transactions, and clean, "arbitrary" references to other persistent objects.
The ZODB is bigger than just the FileStorage used by default in Zope:
The RelStorage backend lets you put your dat... | 1 | 0 | 0 | ZODB In Real Life | 5 | python,zodb | 0 | 2010-03-05T18:01:00.000 |
Writing an app in Python, and been playing with various ORM setups and straight SQL. All of which are ugly as sin.
I have been looking at ZODB as an object store, and it looks a promising alternative... would you recommend it? What are your experiences, problems, and criticism, particularly regarding developer's perspe... | 43 | 5 | 0.197375 | 0 | false | 2,391,063 | 0 | 10,874 | 3 | 0 | 0 | 2,388,870 | I would recommend it.
I really don't have any criticisms. If it's an object store your looking for, this is the one to use. I've stored 2.5 million objects in it before and didn't feel a pinch. | 1 | 0 | 0 | ZODB In Real Life | 5 | python,zodb | 0 | 2010-03-05T18:01:00.000 |
Writing an app in Python, and been playing with various ORM setups and straight SQL. All of which are ugly as sin.
I have been looking at ZODB as an object store, and it looks a promising alternative... would you recommend it? What are your experiences, problems, and criticism, particularly regarding developer's perspe... | 43 | 2 | 0.07983 | 0 | false | 2,389,155 | 0 | 10,874 | 3 | 0 | 0 | 2,388,870 | ZODB has been used for plenty of large databases
Most ZODB usage is/was probably Zope users who migrated away if they migrate away from Zope
Performance is not so good as relatonal database+ORM especially if you have lots of writes.
Long term maintenance is not so bad, you want to pack the database from time to time, b... | 1 | 0 | 0 | ZODB In Real Life | 5 | python,zodb | 0 | 2010-03-05T18:01:00.000 |
I process a lot of text/data that I exchange between Python, R, and sometimes Matlab.
My go-to is the flat text file, but also use SQLite occasionally to store the data and access from each program (not Matlab yet though). I don't use GROUPBY, AVG, etc. in SQL as much as I do these operations in R, so I don't necessari... | 8 | 15 | 1.2 | 1 | true | 2,392,026 | 0 | 3,563 | 1 | 0 | 0 | 2,392,017 | If all the languages support SQLite - use it. The power of SQL might not be useful to you right now, but it probably will be at some point, and it saves you having to rewrite things later when you decide you want to be able to query your data in more complicated ways.
SQLite will also probably be substantially faster i... | 1 | 0 | 0 | SQLite or flat text file? | 2 | python,sql,database,r,file-format | 0 | 2010-03-06T09:30:00.000 |
They will also search part of their name. Not only words with spaces.
If they type "Matt", I expect to retrieve "Matthew" too. | 3 | 0 | 0 | 0 | false | 2,395,473 | 0 | 291 | 1 | 0 | 0 | 2,394,870 | If you are trying to search for the names through any development Language, you can use the Regular expression package in Java.
Some thing like java.util.regex.*; | 1 | 0 | 0 | Suppose I have 400 rows of people's names in a database. What's the best way to do a search for their names? | 4 | python,mysql,database,search,indexing | 0 | 2010-03-07T01:54:00.000 |
Say I have a simple table that contains username, firstname, lastname.
How do I express this in berkeley Db?
I'm currently using bsddb as the interface.
Cheers. | 1 | 4 | 1.2 | 0 | true | 2,399,691 | 0 | 1,199 | 1 | 0 | 0 | 2,399,643 | You have to pick one "column" as the key (must be unique; I imagine that would be "username" in your case) -- the only way searches will ever possibly happen. The other columns can be made to be the single string value of that key by any way you like, from pickling to simple joining with a character that's guaranteed ... | 1 | 0 | 0 | Expressing multiple columns in berkeley db in python? | 2 | python,berkeley-db,bsddb,okvs | 0 | 2010-03-08T06:25:00.000 |
Suppose I have 500 rows of data, each with a paragraph of text (like this paragraph). That's it.I want to do a search that matches part of words. (%LIKE%, not FULL_TEXT)
What would be faster?
SELECT * FROM ...WHERE LIKE "%query%"; This would put load on the database server.
Select all. Then, go through each one and do... | 0 | 1 | 1.2 | 0 | true | 2,401,635 | 0 | 105 | 1 | 0 | 0 | 2,401,508 | This is very hard for us to determine without knowing:
the amount of text to search
the load and configuration on the database server
the load and configuration on on the webserver
etc etc ...
With that said i would conceptually definitely go for the first scenario. It should be lightening-fast when searching only 50... | 1 | 0 | 0 | What would be the most efficient way to do this search (mysql or text)? | 2 | python,mysql,database,regex,search | 0 | 2010-03-08T13:18:00.000 |
I have an idea for a product that I want to be web-based. But because I live in a part of the world where the internet is not always available, there needs to be a client desktop component that is available for when the internet is down. Also, I have been a SQL programmer, a desktop application programmer using dBase, ... | 1 | 0 | 0 | 0 | false | 2,430,572 | 1 | 174 | 3 | 0 | 0 | 2,428,077 | If you wan't to run a version of the server on desktops, your best options would be Python, Rails, or Java servlets, all of which can be easily packaged into small self contained servers with no dependencies.
My recommendation for the desktop would be HTML 5 local storage. The standard hasn't been finalized, but there... | 1 | 0 | 0 | Old desktop programmer wants to create S+S project | 3 | php,python,ruby-on-rails,programming-languages,saas | 0 | 2010-03-11T19:38:00.000 |
I have an idea for a product that I want to be web-based. But because I live in a part of the world where the internet is not always available, there needs to be a client desktop component that is available for when the internet is down. Also, I have been a SQL programmer, a desktop application programmer using dBase, ... | 1 | 0 | 0 | 0 | false | 2,429,484 | 1 | 174 | 3 | 0 | 0 | 2,428,077 | The languages you list are all serverside components. The big question is whether you can sensibly build a thick client - effectively you could develop a multi-tier application where the webserver sits on the client and uses a webservice as a datafeed if/when its available but the solution is not very portable.
You cou... | 1 | 0 | 0 | Old desktop programmer wants to create S+S project | 3 | php,python,ruby-on-rails,programming-languages,saas | 0 | 2010-03-11T19:38:00.000 |
I have an idea for a product that I want to be web-based. But because I live in a part of the world where the internet is not always available, there needs to be a client desktop component that is available for when the internet is down. Also, I have been a SQL programmer, a desktop application programmer using dBase, ... | 1 | 0 | 0 | 0 | false | 2,428,452 | 1 | 174 | 3 | 0 | 0 | 2,428,077 | If you want a 'desktop component' that is available for you to do development on whenever your internet is out, you could really choose any of those technologies. You can always have a local server (like apache) running on your machine, as well as a local sql database, though if your database contains a large amount of... | 1 | 0 | 0 | Old desktop programmer wants to create S+S project | 3 | php,python,ruby-on-rails,programming-languages,saas | 0 | 2010-03-11T19:38:00.000 |
Let's say I have an user registration form. In this form, I have the option for the user to upload a photo. I have an User table and Photo table. My User table has a "PathToPhoto" column. My question is how do I fill in the "PathToPhoto" column if the photo is uploaded and inserted into Photo table before the user i... | 0 | 0 | 1.2 | 0 | true | 2,435,639 | 0 | 397 | 1 | 0 | 0 | 2,435,281 | To make sure we're on the same page, is the following correct?
You're inserting the photo information into the Photo table immediately after the user uploads the photo but before he/she submits the form;
When the user submits the form, you're inserting a row into the User table;
One of the items in that row is informa... | 1 | 0 | 0 | Database: storing data from user registration form | 1 | python,database,postgresql | 0 | 2010-03-12T19:32:00.000 |
I am planning to make some big project (1 000 000 users, approximately 500 request pre second - in hot time).
For performance I'm going to use no relational dbms (each request could cost lot of instructions in relational dbms like mysql) - so i can't use DAL.
My question is:
how web2py is working with a big traffic, i... | 3 | 1 | 0.066568 | 0 | false | 9,985,357 | 1 | 1,388 | 2 | 0 | 0 | 2,459,549 | Zope and the ZODB have been used with big applications, but I'd still consider linking Zope with MySQL or something like that for serious large-scale applications. Even though Zope has had a lot of development cycles, it is usually used with another database engine for good reason. As far as I know, the argument appl... | 1 | 0 | 0 | web2py or grok (zope) on a big portal, | 3 | python,zope,web2py,zodb,grok | 0 | 2010-03-17T02:26:00.000 |
I am planning to make some big project (1 000 000 users, approximately 500 request pre second - in hot time).
For performance I'm going to use no relational dbms (each request could cost lot of instructions in relational dbms like mysql) - so i can't use DAL.
My question is:
how web2py is working with a big traffic, i... | 3 | 7 | 1 | 0 | false | 2,459,620 | 1 | 1,388 | 2 | 0 | 0 | 2,459,549 | First, don't assume that a data abstraction layer will have unacceptable performance, until you actually see it in practice. It is pretty easy to switch to RAW sql if and when you run into a problem.
Second, most users who worry about there server technology handling a million users never finish their applications. P... | 1 | 0 | 0 | web2py or grok (zope) on a big portal, | 3 | python,zope,web2py,zodb,grok | 0 | 2010-03-17T02:26:00.000 |
I am using Python MySQLDB, and I want to insert this into DATETIME field in Mysql . How do I do that with cursor.execute? | 5 | 1 | 0.066568 | 0 | false | 2,460,546 | 0 | 9,981 | 1 | 0 | 0 | 2,460,491 | Solved.
I just did this:
datetime.datetime.now() ...insert that into the column. | 1 | 0 | 0 | In Python, if I have a unix timestamp, how do I insert that into a MySQL datetime field? | 3 | python,mysql,database,datetime,date | 0 | 2010-03-17T07:28:00.000 |
I want to store the images related to a each person's profile in the DB and retrieve them
when requested and save it as .jpg file - and display it to the users.
How could I render the image data stored in the DB as an image and store it locally?? | 3 | 1 | 0.066568 | 0 | false | 2,477,074 | 0 | 19,327 | 1 | 0 | 0 | 2,477,045 | Why don't you simply store the images on the file system, and only store their references on the database. That's a lot more elegant, and won't consume loads of your database.
Also, you won't have to use any kind of binary functions to read them from the DB, saving memory and loading time.
Is there a very specific reas... | 1 | 0 | 0 | Storing and Retrieving Images from Database using Python | 3 | python,image-manipulation | 0 | 2010-03-19T12:08:00.000 |
A legacy web application written using PHP and utilizing MySql database needs to be rewritten completely. However, the existing database structure must not be changed at all.
I'm looking for suggestions on which framework would be most suitable for this task? Language candidates are Python, PHP, Ruby and Java.
Accordin... | 1 | 0 | 0 | 0 | false | 2,512,975 | 1 | 1,525 | 2 | 0 | 0 | 2,507,463 | There are no clear cut winners when picking a web framework. Each platform you mentioned has its benefits and drawbacks (cost of hardware, professional support, community support, etc.). Depending on your time table, project requirements, and available hardware resources you are probably going to need some different an... | 1 | 0 | 0 | Web framework for an application utilizing existing database? | 8 | java,php,python,ruby | 0 | 2010-03-24T12:11:00.000 |
A legacy web application written using PHP and utilizing MySql database needs to be rewritten completely. However, the existing database structure must not be changed at all.
I'm looking for suggestions on which framework would be most suitable for this task? Language candidates are Python, PHP, Ruby and Java.
Accordin... | 1 | 2 | 0.049958 | 0 | false | 2,507,492 | 1 | 1,525 | 2 | 0 | 0 | 2,507,463 | I have very good experience with Django. Every time I needed it was up to the task for interfacing with existing database.
Autogenerated models are the start, as MySQL is not the strictest with its schema. Not that it will not work only that usually some of the db restrictions are held in app itself. | 1 | 0 | 0 | Web framework for an application utilizing existing database? | 8 | java,php,python,ruby | 0 | 2010-03-24T12:11:00.000 |
I am in need of a lightweight way to store dictionaries of data into a database. What I need is something that:
Creates a database table from a simple type description (int, float, datetime etc)
Takes a dictionary object and inserts it into the database (including handling datetime objects!)
If possible: Can handle b... | 1 | 3 | 0.148885 | 0 | false | 2,539,235 | 0 | 1,069 | 1 | 0 | 0 | 2,539,147 | SQLAlchemy offers an ORM much like django, but does not require that you work within a web framework. | 1 | 0 | 1 | Lightweight Object->Database in Python | 4 | python,sql,orm | 0 | 2010-03-29T15:30:00.000 |
Recently i have developed a billing application for my company with Python/Django. For few months everything was fine but now i am observing that the performance is dropping because of more and more users using that applications. Now the problem is that the application is now very critical for the finance team. Now the... | 11 | 6 | 1 | 0 | false | 2,545,940 | 1 | 1,942 | 3 | 0 | 0 | 2,545,820 | ok, not entirely to the point, but before you go and start fixing it, make sure everyone understands the situation. it seems to me that they're putting some pressure on you to fix the "problem".
well first of all, when you wrote the application, have they specified the performance requirements? did they tell you that t... | 1 | 0 | 0 | Optimization Techniques in Python | 9 | python | 1 | 2010-03-30T14:07:00.000 |
Recently i have developed a billing application for my company with Python/Django. For few months everything was fine but now i am observing that the performance is dropping because of more and more users using that applications. Now the problem is that the application is now very critical for the finance team. Now the... | 11 | 4 | 1.2 | 0 | true | 2,546,955 | 1 | 1,942 | 3 | 0 | 0 | 2,545,820 | A surprising feature of Python is that the pythonic code is quite efficient... So a few general hints:
Use built-ins and standard functions whenever possible, they're already quite well optimized.
Try to use lazy generators instead one-off temporary lists.
Use numpy for vector arithmetic.
Use psyco if running on x86 3... | 1 | 0 | 0 | Optimization Techniques in Python | 9 | python | 1 | 2010-03-30T14:07:00.000 |
Recently i have developed a billing application for my company with Python/Django. For few months everything was fine but now i am observing that the performance is dropping because of more and more users using that applications. Now the problem is that the application is now very critical for the finance team. Now the... | 11 | 2 | 0.044415 | 0 | false | 2,546,996 | 1 | 1,942 | 3 | 0 | 0 | 2,545,820 | before you can "fix" something you need to know what is "broken". In software development that means profiling, profiling, profiling. Did I mention profiling. Without profiling you don't know where CPU cycles and wall clock time is going. Like others have said to get any more useful information you need to post the det... | 1 | 0 | 0 | Optimization Techniques in Python | 9 | python | 1 | 2010-03-30T14:07:00.000 |
Why do people use SQLAlchemy instead of MySQLdb? What advantages does it offer? | 24 | 6 | 1 | 0 | false | 2,550,578 | 0 | 19,410 | 3 | 0 | 0 | 2,550,292 | In addition to what Alex said...
"Not wanting to learn SQL" is probably a bad thing. However, if you want to get more non-technical people involved as part of the development process, ORMs do a pretty good job at it because it does push this level of complexity down a level. One of the elements that has made Django su... | 1 | 0 | 0 | Purpose of SQLAlchemy over MySQLdb | 3 | python,sql,mysql,sqlalchemy | 0 | 2010-03-31T03:19:00.000 |
Why do people use SQLAlchemy instead of MySQLdb? What advantages does it offer? | 24 | 32 | 1.2 | 0 | true | 2,550,364 | 0 | 19,410 | 3 | 0 | 0 | 2,550,292 | You don't use SQLAlchemy instead of MySQLdb—you use SQLAlchemy to access something like MySQLdb, oursql (another MySQL driver that I hear is nicer and has better performance), the sqlite3 module, psycopg2, or whatever other database driver you are using.
An ORM (like SQLAlchemy) helps abstract away the details of the ... | 1 | 0 | 0 | Purpose of SQLAlchemy over MySQLdb | 3 | python,sql,mysql,sqlalchemy | 0 | 2010-03-31T03:19:00.000 |
Why do people use SQLAlchemy instead of MySQLdb? What advantages does it offer? | 24 | 12 | 1 | 0 | false | 2,550,304 | 0 | 19,410 | 3 | 0 | 0 | 2,550,292 | Easier portability among different DB engines (say that tomorrow you decide you want to move to sqlite, or PostgreSQL, or...), and higher level of abstraction (and thus potentially higher productivity).
Those are some of the good reasons. There are also some bad reasons for using an ORM, such as not wanting to learn S... | 1 | 0 | 0 | Purpose of SQLAlchemy over MySQLdb | 3 | python,sql,mysql,sqlalchemy | 0 | 2010-03-31T03:19:00.000 |
I'm going to write the web portal using Cassandra databases.
Can you advise me which python interface to use? thrift, lazygal or pycassa?
Are there any benefits to use more complicated thrift then cleaner pycassa?
What about performace - is the same (all of them are just the layer)?
Thanks for any advice. | 5 | 4 | 1.2 | 0 | true | 2,567,396 | 0 | 1,065 | 1 | 0 | 0 | 2,561,804 | Use pycassa if you don't know what to use.
Use lazyboy if you want it to maintain indexes for you. It's significantly more complex. | 1 | 0 | 0 | Cassandra database, which python interface? | 1 | python,database,cassandra,thrift | 0 | 2010-04-01T16:05:00.000 |
I currently have a SQL database of passwords stored in MD5. The server needs to generate a unique key, then sends to the client. In the client, it will use the key as a salt then hash together with the password and send back to the server.
The only problem is that the the SQL DB has the passwords in MD5 already. Theref... | 2 | 1 | 0.099668 | 0 | false | 2,564,367 | 0 | 260 | 1 | 0 | 0 | 2,564,312 | You should use SSL to encrypt the connection, then send the password over plain text from the client. The server will then md5 and compare with the md5 hash in the database to see if they are the same. If so auth = success.
MD5'ing the password on the client buys you nothing because a hacker with the md5 password can g... | 1 | 0 | 0 | Server authorization with MD5 and SQL | 2 | python,sql,database,authorization,md5 | 0 | 2010-04-01T23:42:00.000 |
Is there an easy way (without downloading any plugins) to connect to a MySQL database in Python?
Also, what would be the difference from calling a PHP script to retrieve the data from the database and hand it over to Python and importing one of these third-parties plugins that requires some additional software in the s... | 0 | -1 | -0.066568 | 0 | false | 2,569,567 | 0 | 332 | 2 | 0 | 0 | 2,569,427 | No, there is no way that I've ever heard of or can think of to connect to a MySQL database with vanilla python. Just install the MySqldb python package-
You can typically do:
sudo easy_install MySqldb | 1 | 0 | 0 | Python and MySQL | 3 | php,python,mysql | 0 | 2010-04-02T22:00:00.000 |
Is there an easy way (without downloading any plugins) to connect to a MySQL database in Python?
Also, what would be the difference from calling a PHP script to retrieve the data from the database and hand it over to Python and importing one of these third-parties plugins that requires some additional software in the s... | 0 | -1 | -0.066568 | 0 | false | 2,569,448 | 0 | 332 | 2 | 0 | 0 | 2,569,427 | If you don't want to download the python libraries to connect to MySQL, the effective answer is no, not trivially. | 1 | 0 | 0 | Python and MySQL | 3 | php,python,mysql | 0 | 2010-04-02T22:00:00.000 |
I am an occasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small company and I have been started a new project where I think it is about time to try new databases.
Sales department makes a CSV dump every week and I need to make a small s... | 15 | 1 | 0.022219 | 0 | false | 2,981,162 | 0 | 11,416 | 7 | 0 | 0 | 2,577,967 | It has been a couple of months since I posted this question and I wanted to let you all know how I solved this problem. I am using Berkeley DB with the module bsddb instead loading all the data in a Python dictionary. I am not fully happy, but my users are.
My next step is trying to get a shared server with redis, but ... | 1 | 0 | 0 | Best DataMining Database | 9 | python,database,nosql,data-mining | 0 | 2010-04-05T10:59:00.000 |
I am an occasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small company and I have been started a new project where I think it is about time to try new databases.
Sales department makes a CSV dump every week and I need to make a small s... | 15 | 0 | 0 | 0 | false | 2,581,460 | 0 | 11,416 | 7 | 0 | 0 | 2,577,967 | Take a look at mongodb. | 1 | 0 | 0 | Best DataMining Database | 9 | python,database,nosql,data-mining | 0 | 2010-04-05T10:59:00.000 |
I am an occasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small company and I have been started a new project where I think it is about time to try new databases.
Sales department makes a CSV dump every week and I need to make a small s... | 15 | 12 | 1 | 0 | false | 2,577,979 | 0 | 11,416 | 7 | 0 | 0 | 2,577,967 | You probably do need a full relational DBMS, if not right now, very soon. If you start now while your problems and data are simple and straightforward then when they become complex and difficult you will have plenty of experience with at least one DBMS to help you. You probably don't need MySQL on all desktops, you m... | 1 | 0 | 0 | Best DataMining Database | 9 | python,database,nosql,data-mining | 0 | 2010-04-05T10:59:00.000 |
I am an occasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small company and I have been started a new project where I think it is about time to try new databases.
Sales department makes a CSV dump every week and I need to make a small s... | 15 | 1 | 0.022219 | 0 | false | 2,578,659 | 0 | 11,416 | 7 | 0 | 0 | 2,577,967 | It sounds like each department has their own feudal database, and this implies a lot of unnecessary redundancy and inefficiency.
Instead of transferring hundreds of megabytes to everyone across your network, why not keep your data in MySQL and have the departments upload their data to the database, where it can be norm... | 1 | 0 | 0 | Best DataMining Database | 9 | python,database,nosql,data-mining | 0 | 2010-04-05T10:59:00.000 |
I am an occasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small company and I have been started a new project where I think it is about time to try new databases.
Sales department makes a CSV dump every week and I need to make a small s... | 15 | 0 | 0 | 0 | false | 2,578,310 | 0 | 11,416 | 7 | 0 | 0 | 2,577,967 | If you have that problem with a CSV file, maybe you can just pickle the dictionary and generate a pickle "binary" file with pickle.HIGHEST_PROTOCOL option. It can be faster to read and you get a smaller file. You can load the CSV file once and then generate the pickled file, allowing faster load in next accesses.
Anywa... | 1 | 0 | 0 | Best DataMining Database | 9 | python,database,nosql,data-mining | 0 | 2010-04-05T10:59:00.000 |
I am an occasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small company and I have been started a new project where I think it is about time to try new databases.
Sales department makes a CSV dump every week and I need to make a small s... | 15 | 1 | 0.022219 | 0 | false | 2,578,080 | 0 | 11,416 | 7 | 0 | 0 | 2,577,967 | Have you done any bench marking to confirm that it is the text files that are slowing you down? If you haven't, there's a good chance that tweaking some other part of the code will speed things up so that it's fast enough. | 1 | 0 | 0 | Best DataMining Database | 9 | python,database,nosql,data-mining | 0 | 2010-04-05T10:59:00.000 |
I am an occasional Python programer who only have worked so far with MYSQL or SQLITE databases. I am the computer person for everything in a small company and I have been started a new project where I think it is about time to try new databases.
Sales department makes a CSV dump every week and I need to make a small s... | 15 | 1 | 0.022219 | 0 | false | 2,578,751 | 0 | 11,416 | 7 | 0 | 0 | 2,577,967 | Does the machine this process runs on have sufficient memory and bandwidth to handle this efficiently? Putting MySQL on a slow machine and recoding the tool to use MySQL rather than text files could potentially be far more costly than simply adding memory or upgrading the machine. | 1 | 0 | 0 | Best DataMining Database | 9 | python,database,nosql,data-mining | 0 | 2010-04-05T10:59:00.000 |
I'm writing a database of all DVDs I have at home.
One of the fields, actors, I would like it to be a set of values from an other table, which is storing actors. So for every film I want to store a list of actors, all of which selected from a list of actors, taken from a different table.
Is it possible? How do I do thi... | 3 | 1 | 0.099668 | 0 | false | 2,579,922 | 1 | 85 | 1 | 0 | 0 | 2,579,866 | The answer is clear too. You will need not a field, but another films_actors table. This table would act as your field, but much more reliable. This is called many-to-many relation. | 1 | 0 | 0 | Using set with values from a table | 2 | python,sql,mysql,django-models | 0 | 2010-04-05T17:31:00.000 |
I have a set of .csv files that I want to process. It would be far easier to process it with SQL queries. I wonder if there is some way to load a .csv file and use SQL language to look into it with a scripting language like python or ruby. Loading it with something similar to ActiveRecord would be awesome.
The problem... | 26 | 3 | 0.085505 | 0 | false | 2,580,542 | 0 | 12,118 | 1 | 0 | 0 | 2,580,497 | CSV files are not databases--they have no indices--and any SQL simulation you imposed upon them would amount to little more than searching through the entire thing over and over again. | 1 | 0 | 0 | Database on the fly with scripting languages | 7 | python,sql,database,sqlite,sqlalchemy | 0 | 2010-04-05T19:10:00.000 |
I built an inventory database where ISBN numbers are the primary keys for the items. This worked great for a while as the items were books. Now I want to add non-books. some of the non-books have EANs or ISSNs, some do not.
It's in PostgreSQL with django apps for the frontend and JSON api, plus a few supporting python ... | 2 | 3 | 0.148885 | 0 | false | 2,610,094 | 1 | 1,516 | 2 | 0 | 0 | 2,610,000 | I don't know postgres but normally ISBM would be a unique index key but not the primary. It's better to have an integer as primary/foreign key. That way you only need to add a new field EAN/ISSN as nullable. | 1 | 0 | 0 | ISBNs are used as primary key, now I want to add non-book things to the DB - should I migrate to EAN? | 4 | python,django,postgresql,isbn | 0 | 2010-04-09T18:45:00.000 |
I built an inventory database where ISBN numbers are the primary keys for the items. This worked great for a while as the items were books. Now I want to add non-books. some of the non-books have EANs or ISSNs, some do not.
It's in PostgreSQL with django apps for the frontend and JSON api, plus a few supporting python ... | 2 | 1 | 0.049958 | 0 | false | 2,614,029 | 1 | 1,516 | 2 | 0 | 0 | 2,610,000 | A simple solution (although arguably whether good) would be to use (isbn,title) or (isbn,author) which should pretty much guarantee uniqueness. Ideology is great but practicality also serves a purpose. | 1 | 0 | 0 | ISBNs are used as primary key, now I want to add non-book things to the DB - should I migrate to EAN? | 4 | python,django,postgresql,isbn | 0 | 2010-04-09T18:45:00.000 |
Does anyone know if Python's shelve module uses memory-mapped IO?
Maybe that question is a bit misleading. I realize that shelve uses an underlying dbm-style module to do its dirty work. What are the chances that the underlying module uses mmap?
I'm prototyping a datastore, and while I realize premature optimization... | 2 | 3 | 0.291313 | 0 | false | 2,618,963 | 0 | 902 | 2 | 0 | 0 | 2,618,921 | I'm not sure what you're trying to learn by asking this question, since you already seem to know the answer: it depends on the actual dbm store being used. Some of them will use mmap -- I expect everything but dumbdbm to use mmap -- but so what? The overhead in shelve is almost certainly not in the mmap-versus-fileIO c... | 1 | 0 | 0 | Does Python's shelve module use memory-mapped IO? | 2 | python,mmap,shelve,dbm | 0 | 2010-04-11T22:18:00.000 |
Does anyone know if Python's shelve module uses memory-mapped IO?
Maybe that question is a bit misleading. I realize that shelve uses an underlying dbm-style module to do its dirty work. What are the chances that the underlying module uses mmap?
I'm prototyping a datastore, and while I realize premature optimization... | 2 | 4 | 1.2 | 0 | true | 2,618,981 | 0 | 902 | 2 | 0 | 0 | 2,618,921 | Existing dbm implementations in the Python standard library all use "normal" I/O, not memory mapping. You'll need to code your own dbmish implementation with memory mapping, and integrate it with shelve (directly, or, more productively, through anydbm). | 1 | 0 | 0 | Does Python's shelve module use memory-mapped IO? | 2 | python,mmap,shelve,dbm | 0 | 2010-04-11T22:18:00.000 |
I'm from Brazil and study at FATEC (college located in Brazil).
I'm trying to learn about AppEngine.
Now, I'm trying to load a large database from MySQL to AppEngine to perform some queries, but I don't know how i can do it. I did some testing with CSV files,but is there any way to perform the direct import from MySQL?... | 0 | 0 | 0 | 0 | false | 2,662,880 | 1 | 1,278 | 1 | 1 | 0 | 2,650,499 | If you're using Pentaho BI Server as your data source, why don't you consider using Pentaho Data Integration (ETL tool) to move the data over? At the very least PDI automate any movement of data between your data source and any AppEngine bulk loader tool (it can easily trigger any app with a shell step). | 1 | 0 | 0 | MySQL to AppEngine | 3 | python,mysql,google-app-engine,bulk-load | 0 | 2010-04-16T03:57:00.000 |
There is a m2m relation in my models, User and Role.
I want to merge a role, but i DO NOT want this merge has any effect on user and role relation-ship. Unfortunately, for some complicate reason, role.users if not empty.
I tried to set role.users = None, but SA complains None is not a list.
At this moment, I use... | 0 | 0 | 1.2 | 0 | true | 2,667,004 | 1 | 396 | 1 | 0 | 0 | 2,665,253 | You'd better fix your code to avoid setting role.users for the item you are going to merge. But there is another way - setting cascade='none' for this relation. Then you lose an ability to save relationship from Role side, you'll have to save User with roles attribute set. | 1 | 0 | 0 | In SqlAlchemy, how to ignore m2m relationship attributes when merge? | 1 | python,sqlalchemy | 0 | 2010-04-19T05:01:00.000 |
I am looking for a way to connect to a MS Analysis Services OLAP cube, run MDX queries, and pull the results into Python. In other words, exactly what Excel does. Is there a solution in Python that would let me do that?
Someone with a similar question going pointed to Django's ORM. As much as I like the framework, this... | 7 | 4 | 1.2 | 0 | true | 2,743,692 | 0 | 14,434 | 1 | 0 | 0 | 2,670,887 | I am completely ignorant about Python, but if it can call DLLs then it ought to be able to use Microsoft's ADOMD object. This is the best option I can think of.
You could look at Office Web Components (OWC) as that has a OLAP control than can be embedded on a web page. I think you can pass MDX to it, but perhaps you wa... | 1 | 0 | 0 | MS Analysis Services OLAP API for Python | 3 | python,database,olap | 0 | 2010-04-19T21:05:00.000 |
I am using python in Linux to automate an excel. I have finished writing data into excel by using pyexcelerator package.
Now comes the real challenge. I have to add another tab to the existing sheet and that tab should contain the macro run in the first tab. All these things should be automated. I Googled a lot and fo... | 1 | 0 | 0 | 0 | false | 2,697,769 | 0 | 1,093 | 2 | 0 | 0 | 2,697,701 | Excel Macros are per sheets, so, I am afraid, you need to copy the macros explicitly if you created new sheet, instead of copying existing sheet to new one. | 1 | 0 | 0 | Automating Excel macro using python | 3 | python,linux,excel,automation | 0 | 2010-04-23T10:08:00.000 |
I am using python in Linux to automate an excel. I have finished writing data into excel by using pyexcelerator package.
Now comes the real challenge. I have to add another tab to the existing sheet and that tab should contain the macro run in the first tab. All these things should be automated. I Googled a lot and fo... | 1 | 0 | 0 | 0 | false | 3,596,123 | 0 | 1,093 | 2 | 0 | 0 | 2,697,701 | Maybe manipulating your .xls with Openoffice and pyUno is a better way. Way more powerful. | 1 | 0 | 0 | Automating Excel macro using python | 3 | python,linux,excel,automation | 0 | 2010-04-23T10:08:00.000 |
Last night I upgraded my machine to Ubuntu 10.04 from 9.10.
It seems to have cluttered my python module. Whenever I run python manage.py I get this error:
ImportError: No module named postgresql_psycopg2.base
Can any one throw any light on this? | 2 | 1 | 1.2 | 0 | true | 4,505,549 | 0 | 1,092 | 1 | 0 | 0 | 2,711,737 | Couple of things. I ran into the same kind of error - but for a different thing (ie. "ImportError: No module named django") when I reinstalled some software. Essentially, it messed up my Python paths.
So, you're issue is very reminiscent of the one I had. The issue for me ended up being that the installed I used alter... | 1 | 0 | 0 | Some problem with postgres_psycopg2 | 2 | python,django,postgresql,psycopg2 | 0 | 2010-04-26T07:33:00.000 |
I want to use sqlite memory database for all my testing and Postgresql for my development/production server.
But the SQL syntax is not same in both dbs. for ex: SQLite has autoincrement, and Postgresql has serial
Is it easy to port the SQL script from sqlite to postgresql... what are your solutions?
If you want me to ... | 5 | 12 | 1.2 | 0 | true | 2,721,100 | 0 | 2,892 | 2 | 0 | 0 | 2,716,847 | Don't do it. Don't test in one environment and release and develop in another. Your asking for buggy software using this process. | 1 | 0 | 0 | SQLAlchemy - SQLite for testing and Postgresql for development - How to port? | 3 | python,sqlite,postgresql,sqlalchemy | 0 | 2010-04-26T20:59:00.000 |
I want to use sqlite memory database for all my testing and Postgresql for my development/production server.
But the SQL syntax is not same in both dbs. for ex: SQLite has autoincrement, and Postgresql has serial
Is it easy to port the SQL script from sqlite to postgresql... what are your solutions?
If you want me to ... | 5 | 19 | 1 | 0 | false | 2,717,071 | 0 | 2,892 | 2 | 0 | 0 | 2,716,847 | My suggestion would be: don't. The capabilities of Postgresql are far beyond what SQLite can provide, particularly in the areas of date/numeric support, functions and stored procedures, ALTER support, constraints, sequences, other types like UUID, etc., and even using various SQLAlchemy tricks to try to smooth that o... | 1 | 0 | 0 | SQLAlchemy - SQLite for testing and Postgresql for development - How to port? | 3 | python,sqlite,postgresql,sqlalchemy | 0 | 2010-04-26T20:59:00.000 |
I have searched high and low for an answer to why query results returned in this format and how to convert to a list.
data = cursor.fetchall()
When I print data, it results in:
(('car',), ('boat',), ('plane',), ('truck',))
I want to have the results in a list as ["car", "boat", "plane", "truck"] | 3 | 1 | 0.066568 | 0 | false | 2,723,548 | 0 | 1,007 | 1 | 0 | 0 | 2,723,432 | The result for fetchall() returns an array of rows, where each row is an array with one value per column.
Even if you are selecting only one column, you will still get an array of arrays, but only one value for each row. | 1 | 0 | 0 | Why is recordset result being returned in this way for Python database query? | 3 | python,mysql,list,recordset | 0 | 2010-04-27T17:21:00.000 |
I have a django project that uses a sqlite database that can be written to by an external tool. The text is supposed to be UTF-8, but in some cases there will be errors in the encoding. The text is from an external source, so I cannot control the encoding. Yes, I know that I could write a "wrapping layer" between the e... | 6 | 0 | 0 | 0 | false | 64,263,492 | 1 | 4,701 | 1 | 0 | 0 | 2,744,632 | Incompatible Django version. Check Django version for solving this error first. I was running on Django==3.0.8 and it was producing an error. Than I ran virtualenv where I have Django==3.1.2 and the error was removed. | 1 | 0 | 0 | Change text_factory in Django/sqlite | 6 | python,django,sqlite,pysqlite | 0 | 2010-04-30T13:00:00.000 |
I'm curious about how others have approached the problem of maintaining and synchronizing database changes across many (10+) developers without a DBA? What I mean, basically, is that if someone wants to make a change to the database, what are some strategies to doing that? (i.e. I've created a 'Car' model and now I wan... | 9 | 2 | 1.2 | 0 | true | 2,768,187 | 0 | 930 | 1 | 0 | 0 | 2,748,946 | The solution is rather administrative then technical :)
The general rule is easy, there should only be tree-like dependencies in the project:
- There should always be a single master source of schema, stored together with the project source code in the version control
- Everything affected by the change in the master s... | 1 | 0 | 0 | What are some strategies for maintaining a common database schema with a team of developers and no DBA? | 4 | python,database,postgresql,sqlalchemy,database-schema | 0 | 2010-05-01T04:57:00.000 |
I'm writing an Fast-CGI application that makes use of sqlAlchemy & MySQL for persistent data storage. I have no problem connecting to the DB and setting up ORM (so that tables get mapped to classes); I can even add data to tables (in memory).
But, as soon as I query the DB (and push any changes from memory to storag... | 0 | 2 | 1.2 | 0 | true | 2,751,989 | 0 | 921 | 1 | 0 | 0 | 2,751,957 | Looks like SQLalchemy is pushing or echoing the query to your output (where fast-cgi) is instead looking for headers, then body. Maybe setting sqlalchemy.echo to False can help. | 1 | 0 | 0 | Python fCGI + sqlAlchemy = malformed header from script. Bad header=FROM tags : index.py | 2 | python,mysql,apache,sqlalchemy,fastcgi | 0 | 2010-05-01T23:44:00.000 |
How would one go about authenticating against a single db using Python and openfire? Is there a simple module that will do this? | 0 | 0 | 0 | 0 | false | 2,766,455 | 0 | 94 | 1 | 0 | 0 | 2,752,047 | Openfire uses a SQL database. So talking to the database from python is probably the easiest way.
You could also try to connect/authenticate via XMPP - there's probably an xmpp library for python somewhere. | 1 | 0 | 0 | I need to authenticate against one db with python and openfire. How do I do this? | 1 | python,database,openfire | 0 | 2010-05-02T00:35:00.000 |
I am trying to access a MySQL database with python through Pydev Eclipse. I have installed the necessary files to access MysQL from python and I can access the database only when I write code in Python IDLE environment and run it from command prompt. However I am not able to run my applications from Pydev.
when I use ... | 2 | 0 | 0 | 0 | false | 23,798,598 | 0 | 6,768 | 2 | 1 | 0 | 2,775,095 | If the connector works in the IDLE but not in PyDev. Open Eclipse preferences, open PyDev directory and go to interpreter screen. Remove the interpreter and add it again from the location on your computer (Usually C drive). Close and reload Eclipse and now it should work. | 1 | 0 | 0 | Using MySQL in Pydev Eclipse | 3 | python,mysql,eclipse,pydev,mysql-python | 0 | 2010-05-05T16:36:00.000 |
I am trying to access a MySQL database with python through Pydev Eclipse. I have installed the necessary files to access MysQL from python and I can access the database only when I write code in Python IDLE environment and run it from command prompt. However I am not able to run my applications from Pydev.
when I use ... | 2 | 0 | 0 | 0 | false | 70,125,088 | 0 | 6,768 | 2 | 1 | 0 | 2,775,095 | Posting Answer in case URL changed in future
From Eclipse, choose Window / Preferences / PyDev / Interpreters / Python Interpreter, click on Manage with pip and enter the command:
install mysql-connector-python | 1 | 0 | 0 | Using MySQL in Pydev Eclipse | 3 | python,mysql,eclipse,pydev,mysql-python | 0 | 2010-05-05T16:36:00.000 |
If so, how can I do this? | 0 | 1 | 1.2 | 0 | true | 2,810,300 | 0 | 848 | 2 | 0 | 0 | 2,810,235 | when you create a prepared statement, the "template" SQL code is sent to the DBMS already, which compiles it into an expression tree. When you pass the values, the corresponding library (python sqlite3 module in your case) doesn't merge the values into the statement. The DBMS does.
If you still want to produce a normal... | 1 | 0 | 0 | Can I get the raw SQL generated by a prepared statement in Python’s sqlite3 module? | 2 | python,sqlite,pysqlite | 0 | 2010-05-11T11:28:00.000 |
If so, how can I do this? | 0 | 2 | 0.197375 | 0 | false | 2,810,250 | 0 | 848 | 2 | 0 | 0 | 2,810,235 | When executing a prepared statement, no new SQL is generated.
The idea of prepared statements is that the SQL query and its data are transmitted separately (that's why you don't have to escape any arguments) - the query is most likely only stored in an optimized form after preparing it. | 1 | 0 | 0 | Can I get the raw SQL generated by a prepared statement in Python’s sqlite3 module? | 2 | python,sqlite,pysqlite | 0 | 2010-05-11T11:28:00.000 |
I have a large sql dump file ... with multiple CREATE TABLE and INSERT INTO statements. Is there any way to load these all into a SQLAlchemy sqlite database at once. I plan to use the introspected ORM from sqlsoup after I've created the tables. However, when I use the engine.execute() method it complains: sqlite3.Wa... | 5 | 2 | 1.2 | 0 | true | 2,828,580 | 0 | 3,406 | 2 | 0 | 0 | 2,824,244 | "or some kind of parser"
I've found MySQL to be a great parser for MySQL dump files :)
You said it yourself: "so it has quite a few commands/syntax that sqlite3 does not understand correctly." Clearly then, SQLite is not the tool for this task.
As for your particular error: without context (i.e. a traceback) there's no... | 1 | 0 | 0 | How can I load a sql "dump" file into sql alchemy | 2 | python,sql,sqlalchemy | 0 | 2010-05-13T03:23:00.000 |
I have a large sql dump file ... with multiple CREATE TABLE and INSERT INTO statements. Is there any way to load these all into a SQLAlchemy sqlite database at once. I plan to use the introspected ORM from sqlsoup after I've created the tables. However, when I use the engine.execute() method it complains: sqlite3.Wa... | 5 | 0 | 0 | 0 | false | 2,828,621 | 0 | 3,406 | 2 | 0 | 0 | 2,824,244 | The SQL recognized by MySQL and the SQL in SQLite are quite different. I suggest dumping the data of each table individually, then loading the data into equivalent tables in SQLite.
Create the tables in SQLite manually, using a subset of the "CREATE TABLE" commands given in your raw-dump file. | 1 | 0 | 0 | How can I load a sql "dump" file into sql alchemy | 2 | python,sql,sqlalchemy | 0 | 2010-05-13T03:23:00.000 |
I want to delete all records in a mysql db except the record id's I have in a list. The length of that list can vary and could easily contain 2000+ id's, ...
Currently I convert my list to a string so it fits in something like this:
cursor.execute("""delete from table where id not in (%s)""",(list))
Which doesn't feel... | 3 | 0 | 0 | 0 | false | 2,827,845 | 0 | 3,327 | 1 | 0 | 0 | 2,826,387 | I'd add a "todelete tinyint(1) not null default 1" column to the table, update it to 0 for those id's which have to be kept, then delete from table where todelete;. It's faster than not in.
Or, create a table with the same structure as yours, insert the kept rows there and rename tables. Then, drop the old one. | 1 | 0 | 0 | delete all records except the id I have in a python list | 4 | python,mysql | 0 | 2010-05-13T11:37:00.000 |
Currently, i am querying with this code: meta.Session.query(Label).order_by(Label.name).all()
and it returns me objects sorted by Label.name in this manner ['1','7','1a','5c']. Is there a way i can have the objects returned in the order with their Label.name sorted like this ['1','1a','5c','7']
Thanks! | 1 | 1 | 0.197375 | 0 | false | 2,863,830 | 1 | 1,746 | 1 | 0 | 0 | 2,863,748 | Sorting is done by the database. If you database doesn't support natural sorting your are out of luck and have to sort your rows manually after retrieving them via sqlalchemy. | 1 | 0 | 0 | sqlalchemy natural sorting | 1 | python,sqlalchemy | 0 | 2010-05-19T07:59:00.000 |
I have a relatively extensive sqlite database that I'd like to import into my Google App Engine python app.
I've created my models using the appengine API which are close, but not quite identical to the existing schema. I've written an import script to load the data from sqlite and create/save new appengine objects, bu... | 5 | 0 | 0 | 0 | false | 2,873,946 | 1 | 2,231 | 1 | 1 | 0 | 2,870,379 | I have not had any trouble importing pysqlite2, reading data, then transforming it and writing it to AppEngine using the remote_api.
What error are you seeing? | 1 | 0 | 0 | Importing Sqlite data into Google App Engine | 4 | python,google-app-engine,sqlite | 0 | 2010-05-20T00:47:00.000 |
I am working on a personal project where I need to manipulate values in a database-like format.
Up until now I have been using dictionaries, tuples, and lists to store and consult those values.
I am thinking about starting to use SQL to manipulate those values, but I don't know if it's worth the effort, because I don't... | 1 | 2 | 0.132549 | 0 | false | 2,870,821 | 0 | 291 | 3 | 0 | 0 | 2,870,815 | No, I think you just stick to dictionaries or tuples if you only have rows around 100 | 1 | 0 | 0 | Python and database | 3 | python,sql,database | 0 | 2010-05-20T03:24:00.000 |
I am working on a personal project where I need to manipulate values in a database-like format.
Up until now I have been using dictionaries, tuples, and lists to store and consult those values.
I am thinking about starting to use SQL to manipulate those values, but I don't know if it's worth the effort, because I don't... | 1 | 7 | 1.2 | 0 | true | 2,870,832 | 0 | 291 | 3 | 0 | 0 | 2,870,815 | SQL is nice and practical for many kinds of problems, is not that hard to learn at a simple "surface" level, and can be very handy to use in Python with its embedded sqlite. But if you don't know SQL, have no intrinsic motivation to learn it right now, and are already doing all you need to do to/with your data without... | 1 | 0 | 0 | Python and database | 3 | python,sql,database | 0 | 2010-05-20T03:24:00.000 |
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