diff options
Diffstat (limited to 'django/db/backends/sqlite3')
| -rw-r--r-- | django/db/backends/sqlite3/introspection.py | 72 |
1 files changed, 36 insertions, 36 deletions
diff --git a/django/db/backends/sqlite3/introspection.py b/django/db/backends/sqlite3/introspection.py index 50d53bbe0b..b58e6a7faf 100644 --- a/django/db/backends/sqlite3/introspection.py +++ b/django/db/backends/sqlite3/introspection.py @@ -56,54 +56,54 @@ class DatabaseIntrospection(BaseDatabaseIntrospection): info['null_ok']) for info in self._table_info(cursor, table_name)] def get_relations(self, cursor, table_name): - """ - 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] - + """ + 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[results.index('(')+1:results.rindex(')')] + # 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 - + 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 - + 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: + other_table_results = result[0].strip() + li, ri = other_table_results.index('('), other_table_results.rindex(')') + other_table_results = other_table_results[li+1:ri] + + + 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, |