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Fixed #9779: added support for relation detection to inspectdb under …

…SQLite. Thanks, gabbott and ramiro.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10364 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit ef9bedf8153f921e3a4a6c131dd0334bfb8198e9 1 parent 8cc5068
@jacobian jacobian authored
Showing with 49 additions and 2 deletions.
  1. +49 −2 django/db/backends/sqlite3/introspection.py
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51 django/db/backends/sqlite3/introspection.py
@@ -1,3 +1,4 @@
+import re
from django.db.backends import BaseDatabaseIntrospection
# This light wrapper "fakes" a dictionary interface, because some SQLite data
@@ -55,8 +56,54 @@ def get_table_description(self, cursor, table_name):
info['null_ok']) for info in self._table_info(cursor, table_name)]
def get_relations(self, cursor, table_name):
- raise NotImplementedError
-
+ """
+ Returns a dictionary of {field_index: (field_index_other_table, other_table)}
+ representing all relationships to the given table. Indexes are 0-based.
+ """
+
+ # Dictionary of relations to return
+ relations = {}
+
+ # Schema for this table
+ cursor.execute("SELECT sql FROM sqlite_master WHERE tbl_name = %s", [table_name])
+ results = cursor.fetchone()[0].strip()
+ results = results.split('(', 1)[1]
+ results = results.rsplit(')', 1)[0]
+
+ # Walk through and look for references to other tables. SQLite doesn't
+ # really have enforced references, but since it echoes out the SQL used
+ # to create the table we can look for REFERENCES statements used there.
+ for field_index, field_desc in enumerate(results.split(',')):
+ field_desc = field_desc.strip()
+ if field_desc.startswith("UNIQUE"):
+ continue
+
+ m = re.search('references (.*) \(["|](.*)["|]\)', field_desc, re.I)
+ if not m:
+ continue
+
+ table, column = [s.strip('"') for s in m.groups()]
+
+ cursor.execute("SELECT sql FROM sqlite_master WHERE tbl_name = %s", [table])
+ result = cursor.fetchone()
+ if not result:
+ continue
+ other_table_results = result[0].strip()
+ other_table_results = other_table_results.split('(', 1)[1]
+ other_table_results = other_table_results.rsplit(')', 1)[0]
+
+ for other_index, other_desc in enumerate(other_table_results.split(',')):
+ other_desc = other_desc.strip()
+ if other_desc.startswith('UNIQUE'):
+ continue
+
+ name = other_desc.split(' ', 1)[0].strip('"')
+ if name == column:
+ relations[field_index] = (other_index, table)
+ break
+
+ return relations
+
def get_indexes(self, cursor, table_name):
"""
Returns a dictionary of fieldname -> infodict for the given table,
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