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Fixed #27324 -- Simplified DatabaseIntrospection.get_constraints() on Oracle.

This commit is contained in:
Mariusz Felisiak 2016-10-14 19:59:13 +02:00 committed by Tim Graham
parent 424187ec4b
commit 5a772a0b7b
1 changed files with 17 additions and 39 deletions
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56
django/db/backends/oracle/introspection.py
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@ -158,7 +158,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
Retrieves any constraints or keys (unique, pk, fk, check, index) across one or more columns.
"""
constraints = {}
# Loop over the constraints, getting PKs and uniques
# Loop over the constraints, getting PKs, uniques, and checks
cursor.execute("""
SELECT
user_constraints.constraint_name,
@ -167,29 +167,34 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
WHEN 'P' THEN 1
ELSE 0
END AS is_primary_key,
CASE user_indexes.uniqueness
WHEN 'UNIQUE' THEN 1
CASE
WHEN EXISTS (
SELECT 1
FROM user_indexes
WHERE user_indexes.index_name = user_constraints.index_name
AND user_indexes.uniqueness = 'UNIQUE'
)
THEN 1
ELSE 0
END AS is_unique,
CASE user_constraints.constraint_type
WHEN 'C' THEN 1
ELSE 0
END AS is_check_constraint
END AS is_check_constraint,
CASE
WHEN user_constraints.constraint_type IN ('P', 'U') THEN 1
ELSE 0
END AS has_index
FROM
user_constraints
INNER JOIN
user_indexes ON user_indexes.index_name = user_constraints.index_name
LEFT OUTER JOIN
user_cons_columns cols ON user_constraints.constraint_name = cols.constraint_name
WHERE
(
user_constraints.constraint_type = 'P' OR
user_constraints.constraint_type = 'U'
)
user_constraints.constraint_type = ANY('P', 'U', 'C')
AND user_constraints.table_name = UPPER(%s)
ORDER BY cols.position
""", [table_name])
for constraint, column, pk, unique, check in cursor.fetchall():
for constraint, column, pk, unique, check, index in cursor.fetchall():
# If we're the first column, make the record
if constraint not in constraints:
constraints[constraint] = {
@ -198,34 +203,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
"unique": unique,
"foreign_key": None,
"check": check,
"index": True, # All P and U come with index, see inner join above
}
# Record the details
constraints[constraint]['columns'].append(column)
# Check constraints
cursor.execute("""
SELECT
cons.constraint_name,
LOWER(cols.column_name) AS column_name
FROM
user_constraints cons
LEFT OUTER JOIN
user_cons_columns cols ON cons.constraint_name = cols.constraint_name
WHERE
cons.constraint_type = 'C' AND
cons.table_name = UPPER(%s)
ORDER BY cols.position
""", [table_name])
for constraint, column in cursor.fetchall():
# If we're the first column, make the record
if constraint not in constraints:
constraints[constraint] = {
"columns": [],
"primary_key": False,
"unique": False,
"foreign_key": None,
"check": True,
"index": False,
"index": index, # All P and U come with index
}
# Record the details
constraints[constraint]['columns'].append(column)