140 lines
4.8 KiB
Python
140 lines
4.8 KiB
Python
"""
|
|
PostgreSQL database backend for Django.
|
|
|
|
Requires psycopg 1: http://initd.org/projects/psycopg1
|
|
"""
|
|
|
|
from django.db.backends import util
|
|
try:
|
|
import psycopg as Database
|
|
except ImportError, e:
|
|
from django.core.exceptions import ImproperlyConfigured
|
|
raise ImproperlyConfigured, "Error loading psycopg module: %s" % e
|
|
|
|
DatabaseError = Database.DatabaseError
|
|
|
|
try:
|
|
# Only exists in Python 2.4+
|
|
from threading import local
|
|
except ImportError:
|
|
# Import copy of _thread_local.py from Python 2.4
|
|
from django.utils._threading_local import local
|
|
|
|
class DatabaseWrapper(local):
|
|
def __init__(self, **kwargs):
|
|
self.connection = None
|
|
self.queries = []
|
|
self.options = kwargs
|
|
|
|
def cursor(self):
|
|
from django.conf import settings
|
|
if self.connection is None:
|
|
if settings.DATABASE_NAME == '':
|
|
from django.core.exceptions import ImproperlyConfigured
|
|
raise ImproperlyConfigured, "You need to specify DATABASE_NAME in your Django settings file."
|
|
conn_string = "dbname=%s" % settings.DATABASE_NAME
|
|
if settings.DATABASE_USER:
|
|
conn_string = "user=%s %s" % (settings.DATABASE_USER, conn_string)
|
|
if settings.DATABASE_PASSWORD:
|
|
conn_string += " password='%s'" % settings.DATABASE_PASSWORD
|
|
if settings.DATABASE_HOST:
|
|
conn_string += " host=%s" % settings.DATABASE_HOST
|
|
if settings.DATABASE_PORT:
|
|
conn_string += " port=%s" % settings.DATABASE_PORT
|
|
self.connection = Database.connect(conn_string, **self.options)
|
|
self.connection.set_isolation_level(1) # make transactions transparent to all cursors
|
|
cursor = self.connection.cursor()
|
|
cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
|
|
if settings.DEBUG:
|
|
return util.CursorDebugWrapper(cursor, self)
|
|
return cursor
|
|
|
|
def _commit(self):
|
|
return self.connection.commit()
|
|
|
|
def _rollback(self):
|
|
if self.connection:
|
|
return self.connection.rollback()
|
|
|
|
def close(self):
|
|
if self.connection is not None:
|
|
self.connection.close()
|
|
self.connection = None
|
|
|
|
supports_constraints = True
|
|
|
|
def quote_name(name):
|
|
if name.startswith('"') and name.endswith('"'):
|
|
return name # Quoting once is enough.
|
|
return '"%s"' % name
|
|
|
|
def dictfetchone(cursor):
|
|
"Returns a row from the cursor as a dict"
|
|
return cursor.dictfetchone()
|
|
|
|
def dictfetchmany(cursor, number):
|
|
"Returns a certain number of rows from a cursor as a dict"
|
|
return cursor.dictfetchmany(number)
|
|
|
|
def dictfetchall(cursor):
|
|
"Returns all rows from a cursor as a dict"
|
|
return cursor.dictfetchall()
|
|
|
|
def get_last_insert_id(cursor, table_name, pk_name):
|
|
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
|
|
return cursor.fetchone()[0]
|
|
|
|
def get_date_extract_sql(lookup_type, table_name):
|
|
# lookup_type is 'year', 'month', 'day'
|
|
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
|
|
return "EXTRACT('%s' FROM %s)" % (lookup_type, table_name)
|
|
|
|
def get_date_trunc_sql(lookup_type, field_name):
|
|
# lookup_type is 'year', 'month', 'day'
|
|
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
|
|
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
|
|
|
|
def get_limit_offset_sql(limit, offset=None):
|
|
sql = "LIMIT %s" % limit
|
|
if offset and offset != 0:
|
|
sql += " OFFSET %s" % offset
|
|
return sql
|
|
|
|
def get_random_function_sql():
|
|
return "RANDOM()"
|
|
|
|
def get_fulltext_search_sql(field_name):
|
|
raise NotImplementedError
|
|
|
|
def get_drop_foreignkey_sql():
|
|
return "DROP CONSTRAINT"
|
|
|
|
def get_pk_default_value():
|
|
return "DEFAULT"
|
|
|
|
# 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.
|
|
try:
|
|
Database.register_type(Database.new_type((1082,), "DATE", util.typecast_date))
|
|
except AttributeError:
|
|
raise Exception, "You appear to be using psycopg version 2, which isn't supported yet, because it's still in beta. Use psycopg version 1 instead: http://initd.org/projects/psycopg1"
|
|
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',
|
|
'contains': 'LIKE %s',
|
|
'icontains': 'ILIKE %s',
|
|
'gt': '> %s',
|
|
'gte': '>= %s',
|
|
'lt': '< %s',
|
|
'lte': '<= %s',
|
|
'startswith': 'LIKE %s',
|
|
'endswith': 'LIKE %s',
|
|
'istartswith': 'ILIKE %s',
|
|
'iendswith': 'ILIKE %s',
|
|
}
|