在Django中,South是一个用于数据库迁移的第三方库。要将数据从一个模型迁移到另一个模型,请按照以下步骤操作:
pip install south
INSTALLED_APPS = (
# ...
'south',
# ...
)
python manage.py schemamigration <app_name> --initial
python manage.py datamigration <app_name> <migration_name>
OldModel
迁移到NewModel
,可以使用以下代码:from django.db import models
from south.db import db
from south.v2 import DataMigration
class Migration(DataMigration):
def forwards(self, orm):
"Write your forwards methods here."
# Note: Remember to use orm['appname.ModelName'] rather than "from appname.models..."
for old_model in orm['<app_name>.OldModel'].objects.all():
new_model = orm['<app_name>.NewModel'](
# Copy fields from old_model to new_model
field1=old_model.field1,
field2=old_model.field2,
# ...
)
new_model.save()
def backwards(self, orm):
"Write your backwards methods here."
for new_model in orm['<app_name>.NewModel'].objects.all():
old_model = orm['<app_name>.OldModel'](
# Copy fields from new_model to old_model
field1=new_model.field1,
field2=new_model.field2,
# ...
)
old_model.save()
models = {
# ...
'<app_name>.OldModel': {
'Meta': {'object_name': 'OldModel'},
'field1': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
'field2': ('django.db.models.fields.IntegerField', [], {}),
# ...
},
'<app_name>.NewModel': {
'Meta': {'object_name': 'NewModel'},
'field1': ('django.db.models.fields.CharField', [], {'max_length': '100'}),
'field2': ('django.db.models.fields.IntegerField', [], {}),
# ...
},
# ...
}
complete_apps = ['<app_name>']
python manage.py migrate <app_name>
注意:在使用South进行数据迁移时,请确保在迁移过程中备份数据,以防止数据丢失。
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