Fixed #1904 -- Got postgresql_psycopg2 backend working. Thanks for the patch, germish@gmail.com

"""

from django.db.backends import util

import psycopg2.psycopg1 as Database

import psycopg2 as Database

DatabaseError = Database.DatabaseError

def dictfetchone(cursor):

    "Returns a row from the cursor as a dict"

    # TODO: cursor.dictfetchone() doesn't exist in psycopg2,

    # but no Django code uses this. Safe to remove?

    return cursor.dictfetchone()

def dictfetchmany(cursor, number):

    "Returns a certain number of rows from a cursor as a dict"

    # TODO: cursor.dictfetchmany() doesn't exist in psycopg2,

    # but no Django code uses this. Safe to remove?

    return cursor.dictfetchmany(number)

def dictfetchall(cursor):

    "Returns all rows from a cursor as a dict"

    # TODO: cursor.dictfetchall() doesn't exist in psycopg2,

    # but no Django code uses this. Safe to remove?

    return cursor.dictfetchall()

def get_last_insert_id(cursor, table_name, pk_name):

def get_drop_foreignkey_sql():

    return "DROP CONSTRAINT"

# Register these custom typecasts, because Django expects dates/times to be

# in Python's native (standard-library) datetime/time format, whereas psycopg

# use mx.DateTime by default.

Database.register_type(Database.new_type((1082,), "DATE", util.typecast_date))

Database.register_type(Database.new_type((1083,1266), "TIME", util.typecast_time))

Database.register_type(Database.new_type((1114,1184), "TIMESTAMP", util.typecast_timestamp))

Database.register_type(Database.new_type((16,), "BOOLEAN", util.typecast_boolean))

OPERATOR_MAPPING = {

    'exact': '= %s',

    'iexact': 'ILIKE %s',

from django.db.backends.postgresql.introspection import *

from django.db import transaction

from django.db.backends.postgresql_psycopg2.base import 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)}

    representing all relationships to the given table. Indexes are 0-based.

    """

    cursor.execute("""

        SELECT con.conkey, con.confkey, c2.relname

        FROM pg_constraint con, pg_class c1, pg_class c2

        WHERE c1.oid = con.conrelid

            AND c2.oid = con.confrelid

            AND c1.relname = %s

            AND con.contype = 'f'""", [table_name])

    relations = {}

    for row in cursor.fetchall():

        try:

            # row[0] and row[1] are like "{2}", so strip the curly braces.

            relations[int(row[0][1:-1]) - 1] = (int(row[1][1:-1]) - 1, row[2])

        except ValueError:

            continue

    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}

    """

    # Get the table description because we only have the column indexes, and we

    # need the column names.

    desc = get_table_description(cursor, table_name)

    # This query retrieves each index on the given table.

    cursor.execute("""

        SELECT idx.indkey, idx.indisunique, idx.indisprimary

        FROM pg_catalog.pg_class c, pg_catalog.pg_class c2,

            pg_catalog.pg_index idx

        WHERE c.oid = idx.indrelid

            AND idx.indexrelid = c2.oid

            AND c.relname = %s""", [table_name])

    indexes = {}

    for row in cursor.fetchall():

        # row[0] (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[0]:

            continue

        col_name = desc[int(row[0])-1][0]

        indexes[col_name] = {'primary_key': row[2], 'unique': row[1]}

    return indexes

# Maps type codes to Django Field types.

DATA_TYPES_REVERSE = {

    16: 'BooleanField',

    21: 'SmallIntegerField',

    23: 'IntegerField',

    25: 'TextField',

    869: 'IPAddressField',

    1043: 'CharField',

    1082: 'DateField',

    1083: 'TimeField',

    1114: 'DateTimeField',

    1184: 'DateTimeField',

    1266: 'TimeField',

    1700: 'FloatField',

}