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Simplified DatabaseOperations.sql_flush() on Oracle and PostgreSQL. 

Added early return to decrease an indentation level.
This commit is contained in:
Jon Dufresne 2020-04-17 10:44:27 +02:00 committed by Mariusz Felisiak
parent 8bcca47e83
commit 8005829bb9
2 changed files with 64 additions and 65 deletions
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25
django/db/backends/oracle/operations.py
View File

@ -405,21 +405,22 @@ END;
return lru_cache(maxsize=512)(self.__foreign_key_constraints)
def sql_flush(self, style, tables, sequences, allow_cascade=False):
if tables:
if not tables:
return []
truncated_tables = {table.upper() for table in tables}
constraints = set()
# Oracle's TRUNCATE CASCADE only works with ON DELETE CASCADE
# foreign keys which Django doesn't define. Emulate the
# PostgreSQL behavior which truncates all dependent tables by
# manually retrieving all foreign key constraints and resolving
# dependencies.
# Oracle's TRUNCATE CASCADE only works with ON DELETE CASCADE foreign
# keys which Django doesn't define. Emulate the PostgreSQL behavior
# which truncates all dependent tables by manually retrieving all
# foreign key constraints and resolving dependencies.
for table in tables:
for foreign_table, constraint in self._foreign_key_constraints(table, recursive=allow_cascade):
if allow_cascade:
truncated_tables.add(foreign_table)
constraints.add((foreign_table, constraint))
sql = [
"%s %s %s %s %s %s %s %s;" % (
'%s %s %s %s %s %s %s %s;' % (
style.SQL_KEYWORD('ALTER'),
style.SQL_KEYWORD('TABLE'),
style.SQL_FIELD(self.quote_name(table)),
@ -430,13 +431,13 @@ END;
style.SQL_KEYWORD('INDEX'),
) for table, constraint in constraints
] + [
"%s %s %s;" % (
'%s %s %s;' % (
style.SQL_KEYWORD('TRUNCATE'),
style.SQL_KEYWORD('TABLE'),
style.SQL_FIELD(self.quote_name(table)),
) for table in truncated_tables
] + [
"%s %s %s %s %s %s;" % (
'%s %s %s %s %s %s;' % (
style.SQL_KEYWORD('ALTER'),
style.SQL_KEYWORD('TABLE'),
style.SQL_FIELD(self.quote_name(table)),
@ -445,12 +446,10 @@ END;
style.SQL_FIELD(self.quote_name(constraint)),
) for table, constraint in constraints
]
# Since we've just deleted all the rows, running our sequence
# ALTER code will reset the sequence to 0.
# Since we've just deleted all the rows, running our sequence ALTER
# code will reset the sequence to 0.
sql.extend(self.sequence_reset_by_name_sql(style, sequences))
return sql
else:
return []
def sequence_reset_by_name_sql(self, style, sequences):
sql = []

14
django/db/backends/postgresql/operations.py
View File

@ -118,12 +118,14 @@ class DatabaseOperations(BaseDatabaseOperations):
return "SET TIME ZONE %s"
def sql_flush(self, style, tables, sequences, allow_cascade=False):
if tables:
# Perform a single SQL 'TRUNCATE x, y, z...;' statement. It allows
# us to truncate tables referenced by a foreign key in any other
# table.
if not tables:
return []
# Perform a single SQL 'TRUNCATE x, y, z...;' statement. It allows us
# to truncate tables referenced by a foreign key in any other table.
tables_sql = ', '.join(
style.SQL_FIELD(self.quote_name(table)) for table in tables)
style.SQL_FIELD(self.quote_name(table)) for table in tables
)
if allow_cascade:
sql = ['%s %s %s;' % (
style.SQL_KEYWORD('TRUNCATE'),
@ -137,8 +139,6 @@ class DatabaseOperations(BaseDatabaseOperations):
)]
sql.extend(self.sequence_reset_by_name_sql(style, sequences))
return sql
else:
return []
def sequence_reset_by_name_sql(self, style, sequences):
# 'ALTER SEQUENCE sequence_name RESTART WITH 1;'... style SQL statements