Refs #4299 -- Removed some code duplication in the postgresql introspection modules by letting the `postgresql_psycopg2` backend use identical functions from the `postgresql` backend.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6165 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/postgresql_psycopg2/introspection.py

@@ -1,23 +1,8 @@
 from django.db.backends.postgresql_psycopg2.base import DatabaseOperations
+from django.db.backends.postgresql.introspection import get_table_list, get_table_description, get_indexes, DATA_TYPES_REVERSE
 
 quote_name = DatabaseOperations().quote_name
 
-def get_table_list(cursor):
-    "Returns a list of table names in the current database."
-    cursor.execute("""
-        SELECT c.relname
-        FROM pg_catalog.pg_class c
-        LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
-        WHERE c.relkind IN ('r', 'v', '')
-            AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
-            AND pg_catalog.pg_table_is_visible(c.oid)""")
-    return [row[0] for row in cursor.fetchall()]
-
-def get_table_description(cursor, table_name):
-    "Returns a description of the table, with the DB-API cursor.description interface."
-    cursor.execute("SELECT * FROM %s LIMIT 1" % quote_name(table_name))
-    return cursor.description
-
 def get_relations(cursor, table_name):
     """
     Returns a dictionary of {field_index: (field_index_other_table, other_table)}
@@ -35,49 +20,3 @@ def get_relations(cursor, table_name):
         # row[0] and row[1] are single-item lists, so grab the single item.
         relations[row[0][0] - 1] = (row[1][0] - 1, row[2])
     return relations
-
-def get_indexes(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
-    cursor.execute("""
-        SELECT attr.attname, idx.indkey, idx.indisunique, idx.indisprimary
-        FROM pg_catalog.pg_class c, pg_catalog.pg_class c2,
-            pg_catalog.pg_index idx, pg_catalog.pg_attribute attr
-        WHERE c.oid = idx.indrelid
-            AND idx.indexrelid = c2.oid
-            AND attr.attrelid = c.oid
-            AND attr.attnum = idx.indkey[0]
-            AND c.relname = %s""", [table_name])
-    indexes = {}
-    for row in cursor.fetchall():
-        # row[1] (idx.indkey) is stored in the DB as an array. It comes out as
-        # a string of space-separated integers. This designates the field
-        # indexes (1-based) of the fields that have indexes on the table.
-        # Here, we skip any indexes across multiple fields.
-        if ' ' in row[1]:
-            continue
-        indexes[row[0]] = {'primary_key': row[3], 'unique': row[2]}
-    return indexes
-
-# Maps type codes to Django Field types.
-DATA_TYPES_REVERSE = {
-    16: 'BooleanField',
-    21: 'SmallIntegerField',
-    23: 'IntegerField',
-    25: 'TextField',
-    701: 'FloatField',
-    869: 'IPAddressField',
-    1043: 'CharField',
-    1082: 'DateField',
-    1083: 'TimeField',
-    1114: 'DateTimeField',
-    1184: 'DateTimeField',
-    1266: 'TimeField',
-    1700: 'DecimalField',
-}