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Code Issues 25 Releases Wiki Activity

Explicitly disable FK constraints in SQLite editor

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Alex Hill 2015-02-18 05:59:25 +08:00 committed by Aymeric Augustin
parent 6c58e53d5d
commit 880393a902
1 changed files with 17 additions and 0 deletions
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17
django/db/backends/sqlite3/schema.py
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@ -14,6 +14,23 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
sql_delete_table = "DROP TABLE %(table)s"
sql_create_inline_fk = "REFERENCES %(to_table)s (%(to_column)s)"
def __enter__(self):
with self.connection.cursor() as c:
# Some SQLite schema alterations need foreign key constraints to be
# disabled. This is the default in SQLite but can be changed with a
# build flag and might change in future, so can't be relied upon.
# We enforce it here for the duration of the transaction.
c.execute('PRAGMA foreign_keys')
self._initial_pragma_fk = c.fetchone()[0]
c.execute('PRAGMA foreign_keys = 0')
return super(DatabaseSchemaEditor, self).__enter__()
def __exit__(self, exc_type, exc_value, traceback):
super(DatabaseSchemaEditor, self).__exit__(exc_type, exc_value, traceback)
with self.connection.cursor() as c:
# Restore initial FK setting - PRAGMA values can't be parametrized
c.execute('PRAGMA foreign_keys = %s' % int(self._initial_pragma_fk))
def quote_value(self, value):
try:
value = _sqlite3.adapt(value)