0

通过删除这两个值将日期字段从 null=True 和 blank=True 更改为 required 时，db.alter 命令出现问题。

当下面的行被注释掉时，迁移运行没有问题。

    db.alter_column('milestones_milestone', 'date', self.gf('django.db.models.fields.DateField')(default='2011-01-01'))

这应该将列描述从：

'milestones.milestone': {
  'date': ('django.db.models.fields.DateField', [], {'null': 'True', 'blank': 'True'}),
},

到

'milestones.milestone': {
  'date': ('django.db.models.fields.DateField', [], {default:'2011-01-01'}),
},

当上述行留在迁移中时，我得到的错误是：

 - Migrating forwards to 0002_auto__add_field_milestone_type__chg_field_milestone_date__add_field_mi.
 > milestones:0002_auto__add_field_milestone_type__chg_field_milestone_date__add_field_mi
 ! Error found during real run of migration! Aborting.

 ! Since you have a database that does not support running
 ! schema-altering statements in transactions, we have had
 ! to leave it in an interim state between migrations.

! You *might* be able to recover with:   = ALTER TABLE `milestones_milestone` DROP COLUMN `type` CASCADE; []
   = ALTER TABLE `milestones_milestonetemplate` DROP COLUMN `type` CASCADE; []

 ! The South developers regret this has happened, and would
 ! like to gently persuade you to consider a slightly
 ! easier-to-deal-with DBMS.
 ! NOTE: The error which caused the migration to fail is further up.
Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_manager(global_settings)
  File "C:\Python26\lib\site-packages\django\core\management\__init__.py", line 438, in execute_manager
    utility.execute()
  File "C:\Python26\lib\site-packages\django\core\management\__init__.py", line 379, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "C:\Python26\lib\site-packages\django\core\management\base.py", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "C:\Python26\lib\site-packages\django\core\management\base.py", line 218, in execute
    output = self.handle(*args, **options)
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\management\commands\migrate.py", line 109, in ha
ndle
    ignore_ghosts = ignore_ghosts,
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\migration\__init__.py", line 202, in migrate_app

    success = migrator.migrate_many(target, workplan, database)
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\migration\migrators.py", line 292, in migrate_ma
ny
    result = self.migrate(migration, database)
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\migration\migrators.py", line 125, in migrate
    result = self.run(migration)
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\migration\migrators.py", line 99, in run
    return self.run_migration(migration)
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\migration\migrators.py", line 81, in run_migrati
on
    migration_function()
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\migration\migrators.py", line 57, in <lambda>
    return (lambda: direction(orm))
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\milestones\migrations\0002_auto__add_field_milestone_type_
_chg_field_milestone_date__add_field_mi.py", line 15, in forwards
    db.alter_column('milestones_milestone', 'date', self.gf('django.db.models.fields.DateField')(default='2011-01-01'))
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\db\generic.py", line 373, in alter_column
    self.execute("ALTER TABLE %s %s;" % (self.quote_name(table_name), sql), values)
  File "C:\SQE_Dashboard\SQE Dashboard-mimercha\SQE Dashboard\dashboard\lib\south\db\generic.py", line 137, in execute
    cursor.execute(sql, params)
  File "C:\Python26\lib\site-packages\django\db\backends\util.py", line 15, in execute
    return self.cursor.execute(sql, params)
  File "C:\Python26\lib\site-packages\django\db\backends\mysql\base.py", line 86, in execute
    return self.cursor.execute(query, args)
  File "C:\Python26\lib\site-packages\MySQLdb\cursors.py", line 173, in execute
    self.errorhandler(self, exc, value)
  File "C:\Python26\lib\site-packages\MySQLdb\connections.py", line 36, in defaulterrorhandler
    raise errorclass, errorvalue
django.db.utils.DatabaseError: (1265, "Data truncated for column 'date' at row 512")

我正在使用：

South 0.71 注意：我尝试升级到 0.73，发现 0.73 给了我同样的错误，并且在加载旧的灯具时破坏了我的脚本。

Django 1.2.1

python 库：兼容 MySQLDdb DB API v2.0，修订版 603

mysql Ver 14.14 Distrib 5.1.51，适用于 Win32 (ia32)

InnoDB 存储引擎

4

1 回答 1

1

我刚刚遇到了同样的错误。在我的情况下，我不小心设置了datetime.now导致数据截断的列的默认值。

我建议您从模型中删除默认值，设置auto_now_add=True并重新生成迁移文件。

于 2011-06-09T00:56:00.840 回答