author | Sverre Rabbelier <srabbelier@gmail.com> |
Fri, 06 Mar 2009 22:32:26 +0000 | |
changeset 1700 | 599a5ff8f422 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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from django.db.backends import BaseDatabaseIntrospection |
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import cx_Oracle |
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import re |
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foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)") |
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class DatabaseIntrospection(BaseDatabaseIntrospection): |
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# Maps type objects to Django Field types. |
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data_types_reverse = { |
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cx_Oracle.CLOB: 'TextField', |
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cx_Oracle.DATETIME: 'DateTimeField', |
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cx_Oracle.FIXED_CHAR: 'CharField', |
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cx_Oracle.NCLOB: 'TextField', |
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cx_Oracle.NUMBER: 'DecimalField', |
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cx_Oracle.STRING: 'CharField', |
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cx_Oracle.TIMESTAMP: 'DateTimeField', |
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} |
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def get_table_list(self, cursor): |
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"Returns a list of table names in the current database." |
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cursor.execute("SELECT TABLE_NAME FROM USER_TABLES") |
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return [row[0].upper() for row in cursor.fetchall()] |
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def get_table_description(self, cursor, table_name): |
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"Returns a description of the table, with the DB-API cursor.description interface." |
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cursor.execute("SELECT * FROM %s WHERE ROWNUM < 2" % self.connection.ops.quote_name(table_name)) |
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return cursor.description |
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def table_name_converter(self, name): |
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"Table name comparison is case insensitive under Oracle" |
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return name.upper() |
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def _name_to_index(self, cursor, table_name): |
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""" |
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Returns a dictionary of {field_name: field_index} for the given table. |
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Indexes are 0-based. |
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""" |
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return dict([(d[0], i) for i, d in enumerate(self.get_table_description(cursor, table_name))]) |
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def get_relations(self, cursor, table_name): |
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""" |
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Returns a dictionary of {field_index: (field_index_other_table, other_table)} |
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representing all relationships to the given table. Indexes are 0-based. |
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""" |
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cursor.execute(""" |
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SELECT ta.column_id - 1, tb.table_name, tb.column_id - 1 |
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FROM user_constraints, USER_CONS_COLUMNS ca, USER_CONS_COLUMNS cb, |
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user_tab_cols ta, user_tab_cols tb |
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WHERE user_constraints.table_name = %s AND |
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ta.table_name = %s AND |
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ta.column_name = ca.column_name AND |
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ca.table_name = %s AND |
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user_constraints.constraint_name = ca.constraint_name AND |
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user_constraints.r_constraint_name = cb.constraint_name AND |
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cb.table_name = tb.table_name AND |
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cb.column_name = tb.column_name AND |
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ca.position = cb.position""", [table_name, table_name, table_name]) |
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|
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relations = {} |
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for row in cursor.fetchall(): |
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relations[row[0]] = (row[2], row[1]) |
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return relations |
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def get_indexes(self, cursor, table_name): |
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""" |
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Returns a dictionary of fieldname -> infodict for the given table, |
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where each infodict is in the format: |
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{'primary_key': boolean representing whether it's the primary key, |
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'unique': boolean representing whether it's a unique index} |
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""" |
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# This query retrieves each index on the given table, including the |
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# first associated field name |
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# "We were in the nick of time; you were in great peril!" |
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sql = """ |
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WITH primarycols AS ( |
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SELECT user_cons_columns.table_name, user_cons_columns.column_name, 1 AS PRIMARYCOL |
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FROM user_cons_columns, user_constraints |
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WHERE user_cons_columns.constraint_name = user_constraints.constraint_name AND |
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user_constraints.constraint_type = 'P' AND |
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user_cons_columns.table_name = %s), |
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uniquecols AS ( |
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SELECT user_ind_columns.table_name, user_ind_columns.column_name, 1 AS UNIQUECOL |
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FROM user_indexes, user_ind_columns |
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WHERE uniqueness = 'UNIQUE' AND |
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user_indexes.index_name = user_ind_columns.index_name AND |
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user_ind_columns.table_name = %s) |
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SELECT allcols.column_name, primarycols.primarycol, uniquecols.UNIQUECOL |
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FROM (SELECT column_name FROM primarycols UNION SELECT column_name FROM |
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uniquecols) allcols, |
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primarycols, uniquecols |
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WHERE allcols.column_name = primarycols.column_name (+) AND |
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allcols.column_name = uniquecols.column_name (+) |
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""" |
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cursor.execute(sql, [table_name, table_name]) |
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indexes = {} |
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for row in cursor.fetchall(): |
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# row[1] (idx.indkey) is stored in the DB as an array. It comes out as |
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# a string of space-separated integers. This designates the field |
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# indexes (1-based) of the fields that have indexes on the table. |
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# Here, we skip any indexes across multiple fields. |
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101 |
indexes[row[0]] = {'primary_key': row[1], 'unique': row[2]} |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
102 |
return indexes |
ff1a9aa48cfd
Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
54
diff
changeset
|
103 |