Opened 15 years ago

Closed 15 years ago

Last modified 13 years ago

#12976 closed (fixed)

manage.py sqlflush issues to many 'ALTER' when using multiple mysql databases.

Reported by: pczapla Owned by: nobody
Component: Database layer (models, ORM) Version: 1.2-beta
Severity: Keywords: mysql
Cc: Triage Stage: Accepted
Has patch: yes Needs documentation: no
Needs tests: yes Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

In a brief when I have two databases with different sets of models the sqlflush statement output ALTER TABLE .. AUTO_INCREMENT = 1; for all tables in an application.
The TRUNCATE commands are issued for the right tables.

The problem is quite importan for us as it breaks the test command.

I've created an application that demonstrate the problem. It has two databases: 'default' and 'second' and two models:
'ModelOnTheDefaultDB', 'ModelOnTheSecondDB'.

Here is how the output of syncdb and sqlflush looks like:

$ python manage.py syncdb
Creating table test_app_modelonthedefaultdb

$ python manage.py syncdb --database='second'
Creating table test_app_modelontheseconddb

$ python manage.py sqlflush
BEGIN;
SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE `test_app_modelonthedefaultdb`;
SET FOREIGN_KEY_CHECKS = 1;
ALTER TABLE `test_app_modelonthedefaultdb` AUTO_INCREMENT = 1;
ALTER TABLE `test_app_modelontheseconddb` AUTO_INCREMENT = 1;  -- This alter table should not be here
COMMIT;

$ python manage.py sqlflush --database='second'
BEGIN;
SET FOREIGN_KEY_CHECKS = 0;
TRUNCATE `test_app_modelontheseconddb`;
SET FOREIGN_KEY_CHECKS = 1;
ALTER TABLE `test_app_modelonthedefaultdb` AUTO_INCREMENT = 1; -- This alter table should not be here
ALTER TABLE `test_app_modelontheseconddb` AUTO_INCREMENT = 1; 
COMMIT;

Attachments (2)

split_test.zip (3.8 KB ) - added by pczapla 15 years ago.
A demo project that shows the problem
patch.txt (829 bytes ) - added by pczapla 15 years ago.
I've attached a quick solution that fixed the problem for me.

Download all attachments as: .zip

Change History (6)

by pczapla, 15 years ago

Attachment: split_test.zip added

A demo project that shows the problem

by pczapla, 15 years ago

Attachment: patch.txt added

I've attached a quick solution that fixed the problem for me.

comment:1 by pczapla, 15 years ago

Has patch: set
Needs tests: set

comment:2 by Jacob, 15 years ago

Triage Stage: UnreviewedAccepted

comment:3 by Russell Keith-Magee, 15 years ago

Resolution: fixed
Status: newclosed

(In [12753]) Fixed #12976 -- Fixed the sequence reset commands issued by sqlflush in a multidb setup. To achieve this, database introspection was modified to utilize routing information to determine if a model should be available. Thanks to pczapla for the report.

comment:4 by Jacob, 13 years ago

milestone: 1.2

Milestone 1.2 deleted

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