Created
November 16, 2010 10:15
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Django helper to use SELECT FOR UPDATE in the query.
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from django.db import DEFAULT_DB_ALIAS | |
def select_for_update(queryset): | |
""" Returns query, rewrited to use SELECT ... FOR UPDATE. | |
Can be used in transaction to get lock on selected rows. | |
Database must support this SQL statements. | |
Example: | |
>>> query = select_for_update(MyModel.objects.filter(blah = 'minor')) | |
>>> unicode(query.query) | |
"SELECT * FROM myapp_mymodel WHERE blah = 'minor' FOR UPDATE" | |
""" | |
sql, params = queryset.query.get_compiler(DEFAULT_DB_ALIAS).as_sql() | |
return queryset.model._default_manager.raw(sql + ' FOR UPDATE', params) |
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