| from django.db.backends import BaseDatabaseIntrospection |
| import cx_Oracle |
| import re |
| |
| foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)") |
| |
| class DatabaseIntrospection(BaseDatabaseIntrospection): |
| # Maps type objects to Django Field types. |
| data_types_reverse = { |
| cx_Oracle.CLOB: 'TextField', |
| cx_Oracle.DATETIME: 'DateField', |
| cx_Oracle.FIXED_CHAR: 'CharField', |
| cx_Oracle.NCLOB: 'TextField', |
| cx_Oracle.NUMBER: 'DecimalField', |
| cx_Oracle.STRING: 'CharField', |
| cx_Oracle.TIMESTAMP: 'DateTimeField', |
| } |
| |
| try: |
| data_types_reverse[cx_Oracle.NATIVE_FLOAT] = 'FloatField' |
| except AttributeError: |
| pass |
| |
| try: |
| data_types_reverse[cx_Oracle.UNICODE] = 'CharField' |
| except AttributeError: |
| pass |
| |
| def get_field_type(self, data_type, description): |
| # If it's a NUMBER with scale == 0, consider it an IntegerField |
| if data_type == cx_Oracle.NUMBER and description[5] == 0: |
| if description[4] > 11: |
| return 'BigIntegerField' |
| else: |
| return 'IntegerField' |
| else: |
| return super(DatabaseIntrospection, self).get_field_type( |
| data_type, description) |
| |
| def get_table_list(self, cursor): |
| "Returns a list of table names in the current database." |
| cursor.execute("SELECT TABLE_NAME FROM USER_TABLES") |
| return [row[0].lower() for row in cursor.fetchall()] |
| |
| def get_table_description(self, cursor, table_name): |
| "Returns a description of the table, with the DB-API cursor.description interface." |
| cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % self.connection.ops.quote_name(table_name)) |
| description = [] |
| for desc in cursor.description: |
| description.append((desc[0].lower(),) + desc[1:]) |
| return description |
| |
| def table_name_converter(self, name): |
| "Table name comparison is case insensitive under Oracle" |
| return name.lower() |
| |
| def _name_to_index(self, cursor, table_name): |
| """ |
| Returns a dictionary of {field_name: field_index} for the given table. |
| Indexes are 0-based. |
| """ |
| return dict([(d[0], i) for i, d in enumerate(self.get_table_description(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. |
| """ |
| cursor.execute(""" |
| SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1 |
| FROM user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb, |
| user_tab_cols ta, user_tab_cols tb |
| WHERE user_constraints.table_name = %s AND |
| ta.table_name = %s AND |
| ta.column_name = ca.column_name AND |
| ca.table_name = %s AND |
| user_constraints.constraint_name = ca.constraint_name AND |
| user_constraints.r_constraint_name = cb.constraint_name AND |
| cb.table_name = tb.table_name AND |
| cb.column_name = tb.column_name AND |
| ca.position = cb.position""", [table_name, table_name, table_name]) |
| |
| relations = {} |
| for row in cursor.fetchall(): |
| relations[row[0]] = (row[2], row[1]) |
| return relations |
| |
| def get_indexes(self, cursor, table_name): |
| """ |
| Returns a dictionary of fieldname -> infodict for the given table, |
| where each infodict is in the format: |
| {'primary_key': boolean representing whether it's the primary key, |
| 'unique': boolean representing whether it's a unique index} |
| """ |
| # This query retrieves each index on the given table, including the |
| # first associated field name |
| # "We were in the nick of time; you were in great peril!" |
| sql = """\ |
| SELECT LOWER(all_tab_cols.column_name) AS column_name, |
| CASE user_constraints.constraint_type |
| WHEN 'P' THEN 1 ELSE 0 |
| END AS is_primary_key, |
| CASE user_indexes.uniqueness |
| WHEN 'UNIQUE' THEN 1 ELSE 0 |
| END AS is_unique |
| FROM all_tab_cols, user_cons_columns, user_constraints, user_ind_columns, user_indexes |
| WHERE all_tab_cols.column_name = user_cons_columns.column_name (+) |
| AND all_tab_cols.table_name = user_cons_columns.table_name (+) |
| AND user_cons_columns.constraint_name = user_constraints.constraint_name (+) |
| AND user_constraints.constraint_type (+) = 'P' |
| AND user_ind_columns.column_name (+) = all_tab_cols.column_name |
| AND user_ind_columns.table_name (+) = all_tab_cols.table_name |
| AND user_indexes.uniqueness (+) = 'UNIQUE' |
| AND user_indexes.index_name (+) = user_ind_columns.index_name |
| AND all_tab_cols.table_name = UPPER(%s) |
| """ |
| cursor.execute(sql, [table_name]) |
| indexes = {} |
| for row in cursor.fetchall(): |
| indexes[row[0]] = {'primary_key': row[1], 'unique': row[2]} |
| return indexes |