magic-removal: Moved django.core.db.backends to django.db.backends

git-svn-id: http://code.djangoproject.com/svn/django/branches/magic-removal@1632 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/ado_mssql/introspection.py

@@ -0,0 +1,10 @@
+def get_table_list(cursor):
+    raise NotImplementedError
+
+def get_table_description(cursor, table_name):
+    raise NotImplementedError
+
+def get_relations(cursor, table_name):
+    raise NotImplementedError
+
+DATA_TYPES_REVERSE = {}

django/db/backends/ado_mssql/wrapper.py

@@ -0,0 +1,154 @@
+"""
+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 quote_name(self, name):
+        if name.startswith('[') and name.endswith(']'):
+            return name # Quoting once is enough.
+        return '[%s]' % name
+
+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():
+    return "RAND()"
+
+OPERATOR_MAPPING = {
+    'exact': '= %s',
+    'iexact': 'LIKE %s',
+    'contains': 'LIKE %s',
+    'icontains': 'LIKE %s',
+    'ne': '!= %s',
+    'gt': '> %s',
+    'gte': '>= %s',
+    'lt': '< %s',
+    'lte': '<= %s',
+    'startswith': 'LIKE %s',
+    'endswith': 'LIKE %s',
+    'istartswith': 'LIKE %s',
+    'iendswith': 'LIKE %s',
+}
+
+DATA_TYPES = {
+    'AutoField':         'int IDENTITY (1, 1)',
+    'BooleanField':      'bit',
+    'CharField':         'varchar(%(maxlength)s)',
+    'CommaSeparatedIntegerField': 'varchar(%(maxlength)s)',
+    'DateField':         'smalldatetime',
+    'DateTimeField':     'smalldatetime',
+    '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_%(column)s] CHECK ([%(column)s] > 0)',
+    'PositiveSmallIntegerField': 'smallint CONSTRAINT [CK_smallint_pos_%(column)s] CHECK ([%(column)s] > 0)',
+    'SlugField':         'varchar(50)',
+    'SmallIntegerField': 'smallint',
+    'TextField':         'text',
+    'TimeField':         'time',
+    'URLField':          'varchar(200)',
+    'USStateField':      'varchar(2)',
+}
+

django/db/backends/mysql/introspection.py

@@ -0,0 +1,34 @@
+from MySQLdb.constants import FIELD_TYPE
+
+def get_table_list(cursor):
+    "Returns a list of table names in the current database."
+    cursor.execute("SHOW TABLES")
+    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" % table_name)
+    return cursor.description
+
+def get_relations(cursor, table_name):
+    raise NotImplementedError
+
+DATA_TYPES_REVERSE = {
+    FIELD_TYPE.BLOB: 'TextField',
+    FIELD_TYPE.CHAR: 'CharField',
+    FIELD_TYPE.DECIMAL: 'FloatField',
+    FIELD_TYPE.DATE: 'DateField',
+    FIELD_TYPE.DATETIME: 'DateTimeField',
+    FIELD_TYPE.DOUBLE: 'FloatField',
+    FIELD_TYPE.FLOAT: 'FloatField',
+    FIELD_TYPE.INT24: 'IntegerField',
+    FIELD_TYPE.LONG: 'IntegerField',
+    FIELD_TYPE.LONGLONG: 'IntegerField',
+    FIELD_TYPE.SHORT: 'IntegerField',
+    FIELD_TYPE.STRING: 'TextField',
+    FIELD_TYPE.TIMESTAMP: 'DateTimeField',
+    FIELD_TYPE.TINY_BLOB: 'TextField',
+    FIELD_TYPE.MEDIUM_BLOB: 'TextField',
+    FIELD_TYPE.LONG_BLOB: 'TextField',
+    FIELD_TYPE.VAR_STRING: 'CharField',
+}

django/db/backends/mysql/wrapper.py

@@ -0,0 +1,167 @@
+"""
+MySQL database backend for Django.
+
+Requires MySQLdb: http://sourceforge.net/projects/mysql-python
+"""
+
+from django.core.db import base, typecasts
+from django.core.db.dicthelpers import *
+import MySQLdb as Database
+from MySQLdb.converters import conversions
+from MySQLdb.constants import FIELD_TYPE
+import types
+
+DatabaseError = Database.DatabaseError
+
+django_conversions = conversions.copy()
+django_conversions.update({
+    types.BooleanType: typecasts.rev_typecast_boolean,
+    FIELD_TYPE.DATETIME: typecasts.typecast_timestamp,
+    FIELD_TYPE.DATE: typecasts.typecast_date,
+    FIELD_TYPE.TIME: typecasts.typecast_time,
+})
+
+# This is an extra debug layer over MySQL queries, to display warnings.
+# It's only used when DEBUG=True.
+class MysqlDebugWrapper:
+    def __init__(self, cursor):
+        self.cursor = cursor
+
+    def execute(self, sql, params=()):
+        try:
+            return self.cursor.execute(sql, params)
+        except Database.Warning, w:
+            self.cursor.execute("SHOW WARNINGS")
+            raise Database.Warning, "%s: %s" % (w, self.cursor.fetchall())
+
+    def executemany(self, sql, param_list):
+        try:
+            return self.cursor.executemany(sql, param_list)
+        except Database.Warning:
+            self.cursor.execute("SHOW WARNINGS")
+            raise Database.Warning, "%s: %s" % (w, self.cursor.fetchall())
+
+    def __getattr__(self, attr):
+        if self.__dict__.has_key(attr):
+            return self.__dict__[attr]
+        else:
+            return getattr(self.cursor, attr)
+
+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:
+            kwargs = {
+                'user': DATABASE_USER,
+                'db': DATABASE_NAME,
+                'passwd': DATABASE_PASSWORD,
+                'host': DATABASE_HOST,
+                'conv': django_conversions,
+            }
+            if DATABASE_PORT:
+                kwargs['port'] = DATABASE_PORT
+            self.connection = Database.connect(**kwargs)
+        if DEBUG:
+            return base.CursorDebugWrapper(MysqlDebugWrapper(self.connection.cursor()), self)
+        return self.connection.cursor()
+
+    def commit(self):
+        self.connection.commit()
+
+    def rollback(self):
+        if self.connection:
+            try:
+                self.connection.rollback()
+            except Database.NotSupportedError:
+                pass
+
+    def close(self):
+        if self.connection is not None:
+            self.connection.close()
+            self.connection = None
+
+    def quote_name(self, name):
+        if name.startswith("`") and name.endswith("`"):
+            return name # Quoting once is enough.
+        return "`%s`" % name
+
+def get_last_insert_id(cursor, table_name, pk_name):
+    cursor.execute("SELECT LAST_INSERT_ID()")
+    return cursor.fetchone()[0]
+
+def get_date_extract_sql(lookup_type, table_name):
+    # lookup_type is 'year', 'month', 'day'
+    # http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
+    return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), table_name)
+
+def get_date_trunc_sql(lookup_type, field_name):
+    # lookup_type is 'year', 'month', 'day'
+    # http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
+    # MySQL doesn't support DATE_TRUNC, so we fake it by subtracting intervals.
+    # If you know of a better way to do this, please file a Django ticket.
+    subtractions = ["interval (DATE_FORMAT(%s, '%%%%s')) second - interval (DATE_FORMAT(%s, '%%%%i')) minute - interval (DATE_FORMAT(%s, '%%%%H')) hour" % (field_name, field_name, field_name)]
+    if lookup_type in ('year', 'month'):
+        subtractions.append(" - interval (DATE_FORMAT(%s, '%%%%e')-1) day" % field_name)
+    if lookup_type == 'year':
+        subtractions.append(" - interval (DATE_FORMAT(%s, '%%%%m')-1) month" % field_name)
+    return "(%s - %s)" % (field_name, ''.join(subtractions))
+
+def get_limit_offset_sql(limit, offset=None):
+    sql = "LIMIT "
+    if offset and offset != 0:
+        sql += "%s," % offset
+    return sql + str(limit)
+
+def get_random_function_sql():
+    return "RAND()"
+
+OPERATOR_MAPPING = {
+    'exact': '= %s',
+    'iexact': 'LIKE %s',
+    'contains': 'LIKE BINARY %s',
+    'icontains': 'LIKE %s',
+    'ne': '!= %s',
+    'gt': '> %s',
+    'gte': '>= %s',
+    'lt': '< %s',
+    'lte': '<= %s',
+    'startswith': 'LIKE BINARY %s',
+    'endswith': 'LIKE BINARY %s',
+    'istartswith': 'LIKE %s',
+    'iendswith': 'LIKE %s',
+}
+
+# This dictionary maps Field objects to their associated MySQL column
+# types, as strings. Column-type strings can contain format strings; they'll
+# be interpolated against the values of Field.__dict__ before being output.
+# If a column type is set to None, it won't be included in the output.
+DATA_TYPES = {
+    'AutoField':         'mediumint(9) unsigned auto_increment',
+    'BooleanField':      'bool',
+    'CharField':         'varchar(%(maxlength)s)',
+    'CommaSeparatedIntegerField': 'varchar(%(maxlength)s)',
+    'DateField':         'date',
+    'DateTimeField':     'datetime',
+    'FileField':         'varchar(100)',
+    'FilePathField':     'varchar(100)',
+    'FloatField':        'numeric(%(max_digits)s, %(decimal_places)s)',
+    'ImageField':        'varchar(100)',
+    'IntegerField':      'integer',
+    'IPAddressField':    'char(15)',
+    'ManyToManyField':   None,
+    'NullBooleanField':  'bool',
+    'OneToOneField':     'integer',
+    'PhoneNumberField':  'varchar(20)',
+    'PositiveIntegerField': 'integer UNSIGNED',
+    'PositiveSmallIntegerField': 'smallint UNSIGNED',
+    'SlugField':         'varchar(50)',
+    'SmallIntegerField': 'smallint',
+    'TextField':         'longtext',
+    'TimeField':         'time',
+    'URLField':          'varchar(200)',
+    'USStateField':      'varchar(2)',
+}

django/db/backends/postgresql/introspection.py

@@ -0,0 +1,52 @@
+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" % 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
+
+# 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',
+}

django/db/backends/postgresql/wrapper.py

@@ -0,0 +1,148 @@
+"""
+PostgreSQL database backend for Django.
+
+Requires psycopg 1: http://initd.org/projects/psycopg1
+"""
+
+from django.core.db import base, typecasts
+import psycopg as Database
+
+DatabaseError = Database.DatabaseError
+
+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, TIME_ZONE
+        if self.connection is None:
+            if 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" % DATABASE_NAME
+            if DATABASE_USER:
+                conn_string = "user=%s %s" % (DATABASE_USER, conn_string)
+            if DATABASE_PASSWORD:
+                conn_string += " password='%s'" % DATABASE_PASSWORD
+            if DATABASE_HOST:
+                conn_string += " host=%s" % DATABASE_HOST
+            if DATABASE_PORT:
+                conn_string += " port=%s" % 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", [TIME_ZONE])
+        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 quote_name(self, 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()"
+
+# 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", typecasts.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", typecasts.typecast_time))
+Database.register_type(Database.new_type((1114,1184), "TIMESTAMP", typecasts.typecast_timestamp))
+Database.register_type(Database.new_type((16,), "BOOLEAN", typecasts.typecast_boolean))
+
+OPERATOR_MAPPING = {
+    'exact': '= %s',
+    'iexact': 'ILIKE %s',
+    'contains': 'LIKE %s',
+    'icontains': 'ILIKE %s',
+    'ne': '!= %s',
+    'gt': '> %s',
+    'gte': '>= %s',
+    'lt': '< %s',
+    'lte': '<= %s',
+    'startswith': 'LIKE %s',
+    'endswith': 'LIKE %s',
+    'istartswith': 'ILIKE %s',
+    'iendswith': 'ILIKE %s',
+}
+
+# This dictionary maps Field objects to their associated PostgreSQL column
+# types, as strings. Column-type strings can contain format strings; they'll
+# be interpolated against the values of Field.__dict__ before being output.
+# If a column type is set to None, it won't be included in the output.
+DATA_TYPES = {
+    'AutoField':         'serial',
+    'BooleanField':      'boolean',
+    'CharField':         'varchar(%(maxlength)s)',
+    'CommaSeparatedIntegerField': 'varchar(%(maxlength)s)',
+    'DateField':         'date',
+    'DateTimeField':     'timestamp with time zone',
+    'FileField':         'varchar(100)',
+    'FilePathField':     'varchar(100)',
+    'FloatField':        'numeric(%(max_digits)s, %(decimal_places)s)',
+    'ImageField':        'varchar(100)',
+    'IntegerField':      'integer',
+    'IPAddressField':    'inet',
+    'ManyToManyField':   None,
+    'NullBooleanField':  'boolean',
+    'OneToOneField':     'integer',
+    'PhoneNumberField':  'varchar(20)',
+    'PositiveIntegerField': 'integer CHECK ("%(column)s" >= 0)',
+    'PositiveSmallIntegerField': 'smallint CHECK ("%(column)s" >= 0)',
+    'SlugField':         'varchar(50)',
+    'SmallIntegerField': 'smallint',
+    'TextField':         'text',
+    'TimeField':         'time',
+    'URLField':          'varchar(200)',
+    'USStateField':      'varchar(2)',
+}

django/db/backends/sqlite3/introspection.py

@@ -0,0 +1,44 @@
+def get_table_list(cursor):
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name")
+    return [row[0] for row in cursor.fetchall()]
+
+def get_table_description(cursor, table_name):
+    cursor.execute("PRAGMA table_info(%s)" % table_name)
+    return [(row[1], row[2], None, None) for row in cursor.fetchall()]
+
+def get_relations(cursor, table_name):
+    raise NotImplementedError
+
+# Maps SQL types to Django Field types. Some of the SQL types have multiple
+# entries here because SQLite allows for anything and doesn't normalize the
+# field type; it uses whatever was given.
+BASE_DATA_TYPES_REVERSE = {
+    'bool': 'BooleanField',
+    'boolean': 'BooleanField',
+    'smallint': 'SmallIntegerField',
+    'smallinteger': 'SmallIntegerField',
+    'int': 'IntegerField',
+    'integer': 'IntegerField',
+    'text': 'TextField',
+    'char': 'CharField',
+    'date': 'DateField',
+    'datetime': 'DateTimeField',
+    'time': 'TimeField',
+}
+
+# This light wrapper "fakes" a dictionary interface, because some SQLite data
+# types include variables in them -- e.g. "varchar(30)" -- and can't be matched
+# as a simple dictionary lookup.
+class FlexibleFieldLookupDict:
+    def __getitem__(self, key):
+        key = key.lower()
+        try:
+            return BASE_DATA_TYPES_REVERSE[key]
+        except KeyError:
+            import re
+            m = re.search(r'^\s*(?:var)?char\s*\(\s*(\d+)\s*\)\s*$', key)
+            if m:
+                return ('CharField', {'maxlength': m.group(1)})
+            raise KeyError
+
+DATA_TYPES_REVERSE = FlexibleFieldLookupDict()

django/db/backends/sqlite3/wrapper.py

@@ -0,0 +1,175 @@
+"""
+SQLite3 backend for django.  Requires pysqlite2 (http://pysqlite.org/).
+"""
+
+from django.core.db import base, typecasts
+from django.core.db.dicthelpers import *
+from pysqlite2 import dbapi2 as Database
+DatabaseError = Database.DatabaseError
+
+# Register adaptors ###########################################################
+
+Database.register_converter("bool", lambda s: str(s) == '1')
+Database.register_converter("time", typecasts.typecast_time)
+Database.register_converter("date", typecasts.typecast_date)
+Database.register_converter("datetime", typecasts.typecast_timestamp)
+
+# Database wrapper ############################################################
+
+def utf8rowFactory(cursor, row):
+    def utf8(s):
+        if type(s) == unicode:
+            return s.encode("utf-8")
+        else:
+            return s
+    return [utf8(r) for r in row]
+
+class DatabaseWrapper:
+    def __init__(self):
+        self.connection = None
+        self.queries = []
+
+    def cursor(self):
+        from django.conf.settings import DATABASE_NAME, DEBUG
+        if self.connection is None:
+            self.connection = Database.connect(DATABASE_NAME, detect_types=Database.PARSE_DECLTYPES)
+            # register extract and date_trun functions
+            self.connection.create_function("django_extract", 2, _sqlite_extract)
+            self.connection.create_function("django_date_trunc", 2, _sqlite_date_trunc)
+        cursor = self.connection.cursor(factory=SQLiteCursorWrapper)
+        cursor.row_factory = utf8rowFactory
+        if DEBUG:
+            return base.CursorDebugWrapper(cursor, self)
+        else:
+            return cursor
+
+    def commit(self):
+        self.connection.commit()
+
+    def rollback(self):
+        if self.connection:
+            self.connection.rollback()
+
+    def close(self):
+        if self.connection is not None:
+            self.connection.close()
+            self.connection = None
+
+    def quote_name(self, name):
+        if name.startswith('"') and name.endswith('"'):
+            return name # Quoting once is enough.
+        return '"%s"' % name
+
+class SQLiteCursorWrapper(Database.Cursor):
+    """
+    Django uses "format" style placeholders, but pysqlite2 uses "qmark" style.
+    This fixes it -- but note that if you want to use a literal "%s" in a query,
+    you'll need to use "%%s" (which I belive is true of other wrappers as well).
+    """
+
+    def execute(self, query, params=[]):
+        query = self.convert_query(query, len(params))
+        return Database.Cursor.execute(self, query, params)
+
+    def executemany(self, query, params=[]):
+        query = self.convert_query(query, len(params[0]))
+        return Database.Cursor.executemany(self, query, params)
+
+    def convert_query(self, query, num_params):
+        # XXX this seems too simple to be correct... is this right?
+        return query % tuple("?" * num_params)
+
+# Helper functions ############################################################
+
+def get_last_insert_id(cursor, table_name, pk_name):
+    return cursor.lastrowid
+
+def get_date_extract_sql(lookup_type, table_name):
+    # lookup_type is 'year', 'month', 'day'
+    # sqlite doesn't support extract, so we fake it with the user-defined
+    # function _sqlite_extract that's registered in connect(), above.
+    return 'django_extract("%s", %s)' % (lookup_type.lower(), table_name)
+
+def _sqlite_extract(lookup_type, dt):
+    try:
+        dt = typecasts.typecast_timestamp(dt)
+    except (ValueError, TypeError):
+        return None
+    return str(getattr(dt, lookup_type))
+
+def get_date_trunc_sql(lookup_type, field_name):
+    # lookup_type is 'year', 'month', 'day'
+    # sqlite doesn't support DATE_TRUNC, so we fake it as above.
+    return 'django_date_trunc("%s", %s)' % (lookup_type.lower(), 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 _sqlite_date_trunc(lookup_type, dt):
+    try:
+        dt = typecasts.typecast_timestamp(dt)
+    except (ValueError, TypeError):
+        return None
+    if lookup_type == 'year':
+        return "%i-01-01 00:00:00" % dt.year
+    elif lookup_type == 'month':
+        return "%i-%02i-01 00:00:00" % (dt.year, dt.month)
+    elif lookup_type == 'day':
+        return "%i-%02i-%02i 00:00:00" % (dt.year, dt.month, dt.day)
+
+# Operators and fields ########################################################
+
+# SQLite requires LIKE statements to include an ESCAPE clause if the value
+# being escaped has a percent or underscore in it.
+# See http://www.sqlite.org/lang_expr.html for an explanation.
+OPERATOR_MAPPING = {
+    'exact': '= %s',
+    'iexact': "LIKE %s ESCAPE '\\'",
+    'contains': "LIKE %s ESCAPE '\\'",
+    'icontains': "LIKE %s ESCAPE '\\'",
+    'ne': '!= %s',
+    'gt': '> %s',
+    'gte': '>= %s',
+    'lt': '< %s',
+    'lte': '<= %s',
+    'startswith': "LIKE %s ESCAPE '\\'",
+    'endswith': "LIKE %s ESCAPE '\\'",
+    'istartswith': "LIKE %s ESCAPE '\\'",
+    'iendswith': "LIKE %s ESCAPE '\\'",
+}
+
+# SQLite doesn't actually support most of these types, but it "does the right
+# thing" given more verbose field definitions, so leave them as is so that
+# schema inspection is more useful.
+DATA_TYPES = {
+    'AutoField':                    'integer',
+    'BooleanField':                 'bool',
+    'CharField':                    'varchar(%(maxlength)s)',
+    'CommaSeparatedIntegerField':   'varchar(%(maxlength)s)',
+    'DateField':                    'date',
+    'DateTimeField':                'datetime',
+    'FileField':                    'varchar(100)',
+    'FilePathField':                'varchar(100)',
+    'FloatField':                   'numeric(%(max_digits)s, %(decimal_places)s)',
+    'ImageField':                   'varchar(100)',
+    'IntegerField':                 'integer',
+    'IPAddressField':               'char(15)',
+    'ManyToManyField':              None,
+    'NullBooleanField':             'bool',
+    'OneToOneField':                'integer',
+    'PhoneNumberField':             'varchar(20)',
+    'PositiveIntegerField':         'integer unsigned',
+    'PositiveSmallIntegerField':    'smallint unsigned',
+    'SlugField':                    'varchar(50)',
+    'SmallIntegerField':            'smallint',
+    'TextField':                    'text',
+    'TimeField':                    'time',
+    'URLField':                     'varchar(200)',
+    'USStateField':                 'varchar(2)',
+}