Added postgresql_psycopg2 backend, which is untested, just for a starting point

git-svn-id: http://code.djangoproject.com/svn/django/trunk@2928 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/postgresql_psycopg2/base.py

@@ -0,0 +1,125 @@
+"""
+PostgreSQL database backend for Django.
+
+Requires psycopg 2: http://initd.org/projects/psycopg2
+"""
+
+from django.db.backends import util
+import psycopg2.psycopg1 as Database
+
+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):
+        self.connection = None
+        self.queries = []
+
+    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.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_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',
+    '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',
+}

django/db/backends/postgresql_psycopg2/client.py

@@ -0,0 +1 @@
+from django.db.backends.postgresql.client import *

django/db/backends/postgresql_psycopg2/creation.py

@@ -0,0 +1 @@
+from django.db.backends.postgresql.creation import *

django/db/backends/postgresql_psycopg2/introspection.py

@@ -0,0 +1 @@
+from django.db.backends.postgresql.introspection import *