Fixed #225 -- Added first stab at MS SQL Server support (via ADO). Thanks to gmilas@gmail.com for the patch

git-svn-id: http://code.djangoproject.com/svn/django/trunk@879 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/conf/global_settings.py

@@ -45,12 +45,12 @@ SERVER_EMAIL = 'root@localhost'
 SEND_BROKEN_LINK_EMAILS = False
 
 # Database connection info.
-DATABASE_ENGINE = 'postgresql' # 'postgresql', 'mysql', or 'sqlite3'.
+DATABASE_ENGINE = 'postgresql' # 'postgresql', 'mysql', 'sqlite3' or 'ado_mssql'.
-DATABASE_NAME = ''
+DATABASE_NAME = ''             # Or path to database file if using sqlite3.
-DATABASE_USER = ''
+DATABASE_USER = ''             # Not used with sqlite3.
-DATABASE_PASSWORD = ''
+DATABASE_PASSWORD = ''         # Not used with sqlite3.
-DATABASE_HOST = ''             # Set to empty string for localhost.
+DATABASE_HOST = ''             # Set to empty string for localhost. Not used with sqlite3.
-DATABASE_PORT = ''             # Set to empty string for default.
+DATABASE_PORT = ''             # Set to empty string for default. Not used with sqlite3.
 
 # Host for sending e-mail.
 EMAIL_HOST = 'localhost'

django/conf/project_template/settings/main.py

@@ -10,7 +10,7 @@ MANAGERS = ADMINS
 
 LANGUAGE_CODE = 'en-us'
 
-DATABASE_ENGINE = 'postgresql' # 'postgresql', 'mysql', or 'sqlite3'.
+DATABASE_ENGINE = 'postgresql' # 'postgresql', 'mysql', 'sqlite3' or 'ado_mssql'.
 DATABASE_NAME = ''             # Or path to database file if using sqlite3.
 DATABASE_USER = ''             # Not used with sqlite3.
 DATABASE_PASSWORD = ''         # Not used with sqlite3.

django/core/db/backends/ado_mssql.py

@@ -0,0 +1,153 @@
+"""
+ADO MSSQL database backend for Django.
+
+Requires adodbapi 2.0.1: http://adodbapi.sourceforge.net/
+"""
+
+from django.core.db import base
+from django.core.db.dicthelpers import *
+import adodbapi as Database
+import datetime
+try:
+    import mx
+except ImportError:
+    mx = None
+
+DatabaseError = Database.DatabaseError
+
+# We need to use a special Cursor class because adodbapi expects question-mark
+# param style, but Django expects "%s". This cursor converts question marks to
+# format-string style.
+class Cursor(Database.Cursor):
+    def executeHelper(self, operation, isStoredProcedureCall, parameters=None):
+        if parameters is not None and "%s" in operation:
+            operation = operation.replace("%s", "?")
+        Database.Cursor.executeHelper(self, operation, isStoredProcedureCall, parameters)
+
+class Connection(Database.Connection):
+    def cursor(self):
+        return Cursor(self)
+Database.Connection = Connection
+
+origCVtoP = Database.convertVariantToPython
+def variantToPython(variant, adType):
+    if type(variant) == bool and adType == 11:
+        return variant  # bool not 1/0
+    res = origCVtoP(variant, adType)
+    if mx is not None and type(res) == mx.DateTime.mxDateTime.DateTimeType:
+        # Convert ms.DateTime objects to Python datetime.datetime objects.
+        tv = list(res.tuple()[:7])
+        tv[-2] = int(tv[-2])
+        return datetime.datetime(*tuple(tv))
+    if type(res) == float and str(res)[-2:] == ".0":
+        return int(res) # If float but int, then int.
+    return res
+Database.convertVariantToPython = variantToPython
+
+class DatabaseWrapper:
+    def __init__(self):
+        self.connection = None
+        self.queries = []
+
+    def cursor(self):
+        from django.conf.settings import DATABASE_USER, DATABASE_NAME, DATABASE_HOST, DATABASE_PORT, DATABASE_PASSWORD, DEBUG
+        if self.connection is None:
+            if DATABASE_NAME == '' or DATABASE_USER == '':
+                from django.core.exceptions import ImproperlyConfigured
+                raise ImproperlyConfigured, "You need to specify both DATABASE_NAME and DATABASE_USER in your Django settings file."
+            if not DATABASE_HOST:
+                DATABASE_HOST = "127.0.0.1"
+            # TODO: Handle DATABASE_PORT.
+            conn_string = "PROVIDER=SQLOLEDB;DATA SOURCE=%s;UID=%s;PWD=%s;DATABASE=%s" % (DATABASE_HOST, DATABASE_USER, DATABASE_PASSWORD, DATABASE_NAME)
+            self.connection = Database.connect(conn_string)
+        cursor = self.connection.cursor()
+        if DEBUG:
+            return base.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
+
+def get_last_insert_id(cursor, table_name, pk_name):
+    cursor.execute("SELECT %s FROM %s WHERE %s = @@IDENTITY" % (pk_name, table_name, pk_name))
+    return cursor.fetchone()[0]
+
+def get_date_extract_sql(lookup_type, table_name):
+    # lookup_type is 'year', 'month', 'day'
+    return "DATEPART(%s, %s)" % (lookup_type, table_name)
+
+def get_date_trunc_sql(lookup_type, field_name):
+    # lookup_type is 'year', 'month', 'day'
+    if lookup_type=='year':
+        return "Convert(datetime, Convert(varchar, DATEPART(year, %s)) + '/01/01')" % field_name
+    if lookup_type=='month':
+        return "Convert(datetime, Convert(varchar, DATEPART(year, %s)) + '/' + Convert(varchar, DATEPART(month, %s)) + '/01')" % (field_name, field_name)
+    if lookup_type=='day':
+        return "Convert(datetime, Convert(varchar(12), %s))" % field_name
+
+def get_limit_offset_sql(limit, offset=None):
+    # TODO: This is a guess. Make sure this is correct.
+    sql = "LIMIT %s" % limit
+    if offset and offset != 0:
+        sql += " OFFSET %s" % offset
+    return sql
+
+def get_random_function_sql():
+    # TODO: This is a guess. Make sure this is correct.
+    return "RANDOM()"
+
+def get_relations(cursor, table_name):
+    raise NotImplementedError
+
+OPERATOR_MAPPING = {
+    'exact': '=',
+    'iexact': 'LIKE',
+    'contains': 'LIKE',
+    'icontains': 'LIKE',
+    'ne': '!=',
+    'gt': '>',
+    'gte': '>=',
+    'lt': '<',
+    'lte': '<=',
+    'startswith': 'LIKE',
+    'endswith': 'LIKE',
+    'istartswith': 'LIKE',
+    'iendswith': 'LIKE',
+}
+
+DATA_TYPES = {
+    'AutoField':         'int IDENTITY (1, 1)',
+    'BooleanField':      'bit',
+    'CharField':         'varchar(%(maxlength)s)',
+    'CommaSeparatedIntegerField': 'varchar(%(maxlength)s)',
+    'DateField':         'smalldatetime',
+    'DateTimeField':     'smalldatetime',
+    'EmailField':        'varchar(75)',
+    'FileField':         'varchar(100)',
+    'FilePathField':     'varchar(100)',
+    'FloatField':        'numeric(%(max_digits)s, %(decimal_places)s)',
+    'ImageField':        'varchar(100)',
+    'IntegerField':      'int',
+    'IPAddressField':    'char(15)',
+    'ManyToManyField':   None,
+    'NullBooleanField':  'bit',
+    'OneToOneField':     'int',
+    'PhoneNumberField':  'varchar(20)',
+    'PositiveIntegerField': 'int CONSTRAINT [CK_int_pos_%(name)s] CHECK ([%(name)s] > 0)',
+    'PositiveSmallIntegerField': 'smallint CONSTRAINT [CK_smallint_pos_%(name)s] CHECK ([%(name)s] > 0)',
+    'SlugField':         'varchar(50)',
+    'SmallIntegerField': 'smallint',
+    'TextField':         'text',
+    'TimeField':         'time',
+    'URLField':          'varchar(200)',
+    'USStateField':      'varchar(2)',
+}