""" MySQL database backend for Django using MySQL Connector/Python. """ from django.db.backends import BaseDatabaseWrapper, BaseDatabaseFeatures, BaseDatabaseOperations, util try: import mysql.connector as Database except ImportError, e: from django.core.exceptions import ImproperlyConfigured raise ImproperlyConfigured("Error loading MySQLdb module: %s" % e) # We want version (1, 2, 1, 'final', 2) or later. We can't just use # lexicographic ordering in this check because then (1, 2, 1, 'gamma') # inadvertently passes the version test. version = Database.__version__ if ( version[:3] < (0, 0, 2) ): from django.core.exceptions import ImproperlyConfigured raise ImproperlyConfigured("MySQL Connector/Python 0.0.2 or newer is required; you have %s" % Database.__version__) import mysql.connector.conversion import re from django.db.backends import * from django.db.backends.mysql.client import DatabaseClient from django.db.backends.mysql.creation import DatabaseCreation from django.db.backends.mysql.introspection import DatabaseIntrospection from django.db.backends.mysql.validation import DatabaseValidation from django.utils.safestring import SafeString, SafeUnicode # Raise exceptions for database warnings if DEBUG is on from django.conf import settings #if settings.DEBUG: # from warnings import filterwarnings # filterwarnings("error", category=Database.Warning) DatabaseError = Database.DatabaseError IntegrityError = Database.IntegrityError class DjangoMySQLConverter(Database.conversion.MySQLConverter): pass """ def _TIME_to_python(self, v, dsc=None): return util.typecast_time(v) def _decimal(self, v, desc=None): return util.typecast_decimal(v) """ # This should match the numerical portion of the version numbers (we can treat # versions like 5.0.24 and 5.0.24a as the same). Based on the list of version # at http://dev.mysql.com/doc/refman/4.1/en/news.html and # http://dev.mysql.com/doc/refman/5.0/en/news.html . server_version_re = re.compile(r'(\d{1,2})\.(\d{1,2})\.(\d{1,2})') # MySQLdb-1.2.1 and newer automatically makes use of SHOW WARNINGS on # MySQL-4.1 and newer, so the MysqlDebugWrapper is unnecessary. Since the # point is to raise Warnings as exceptions, this can be done with the Python # warning module, and this is setup when the connection is created, and the # standard util.CursorDebugWrapper can be used. Also, using sql_mode # TRADITIONAL will automatically cause most warnings to be treated as errors. class DatabaseFeatures(BaseDatabaseFeatures): autoindexes_primary_keys = False inline_fk_references = False class DatabaseOperations(BaseDatabaseOperations): def date_extract_sql(self, lookup_type, field_name): # http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), field_name) def date_trunc_sql(self, lookup_type, field_name): fields = ['year', 'month', 'day', 'hour', 'minute', 'second'] format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape. format_def = ('0000-', '01', '-01', ' 00:', '00', ':00') try: i = fields.index(lookup_type) + 1 except ValueError: sql = field_name else: format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]]) sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str) return sql def drop_foreignkey_sql(self): return "DROP FOREIGN KEY" def fulltext_search_sql(self, field_name): return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name def limit_offset_sql(self, limit, offset=None): # 'LIMIT 20,40' sql = "LIMIT " if offset and offset != 0: sql += "%s," % offset return sql + str(limit) def quote_name(self, name): if name.startswith("`") and name.endswith("`"): return name # Quoting once is enough. return "`%s`" % name def random_function_sql(self): return 'RAND()' def sql_flush(self, style, tables, sequences): # NB: The generated SQL below is specific to MySQL # 'TRUNCATE x;', 'TRUNCATE y;', 'TRUNCATE z;'... style SQL statements # to clear all tables of all data if tables: sql = ['SET FOREIGN_KEY_CHECKS = 0;'] for table in tables: sql.append('%s %s;' % (style.SQL_KEYWORD('TRUNCATE'), style.SQL_FIELD(self.quote_name(table)))) sql.append('SET FOREIGN_KEY_CHECKS = 1;') # 'ALTER TABLE table AUTO_INCREMENT = 1;'... style SQL statements # to reset sequence indices sql.extend(["%s %s %s %s %s;" % \ (style.SQL_KEYWORD('ALTER'), style.SQL_KEYWORD('TABLE'), style.SQL_TABLE(self.quote_name(sequence['table'])), style.SQL_KEYWORD('AUTO_INCREMENT'), style.SQL_FIELD('= 1'), ) for sequence in sequences]) return sql else: return [] def value_to_db_datetime(self, value): if value is None: return None # MySQL doesn't support tz-aware datetimes if value.tzinfo is not None: raise ValueError("MySQL backend does not support timezone-aware datetimes.") # MySQL doesn't support microseconds return unicode(value.replace(microsecond=0)) def value_to_db_time(self, value): if value is None: return None # MySQL doesn't support tz-aware datetimes if value.tzinfo is not None: raise ValueError("MySQL backend does not support timezone-aware datetimes.") # MySQL doesn't support microseconds return unicode(value.replace(microsecond=0)) def year_lookup_bounds(self, value): # Again, no microseconds first = '%s-01-01 00:00:00' second = '%s-12-31 23:59:59.99' return [first % value, second % value] class DatabaseWrapper(BaseDatabaseWrapper): operators = { 'exact': '= %s', 'iexact': 'LIKE %s', 'contains': 'LIKE BINARY %s', 'icontains': 'LIKE %s', 'regex': 'REGEXP BINARY %s', 'iregex': 'REGEXP %s', 'gt': '> %s', 'gte': '>= %s', 'lt': '< %s', 'lte': '<= %s', 'startswith': 'LIKE BINARY %s', 'endswith': 'LIKE BINARY %s', 'istartswith': 'LIKE %s', 'iendswith': 'LIKE %s', } def __init__(self, *args, **kwargs): super(DatabaseWrapper, self).__init__(*args, **kwargs) self.server_version = None self.features = DatabaseFeatures(self) self.ops = DatabaseOperations() self.client = DatabaseClient(self) self.creation = DatabaseCreation(self) self.introspection = DatabaseIntrospection(self) self.validation = DatabaseValidation(self) def _valid_connection(self): if self.connection is not None: try: self.connection.ping() return True except DatabaseError: self.connection.close() self.connection = None return False def _cursor(self): if not self._valid_connection(): kwargs = { #'conv': django_conversions, 'charset': 'utf8', 'use_unicode': True, } settings_dict = self.settings_dict if settings_dict['USER']: kwargs['user'] = settings_dict['USER'] if settings_dict['NAME']: kwargs['db'] = settings_dict['NAME'] if settings_dict['PASSWORD']: kwargs['passwd'] = settings_dict['PASSWORD'] if settings_dict['HOST'].startswith('/'): kwargs['unix_socket'] = settings_dict['HOST'] elif settings_dict['HOST']: kwargs['host'] = settings_dict['HOST'] if settings_dict['PORT']: kwargs['port'] = int(settings_dict['PORT']) kwargs.update(settings_dict['OPTIONS']) self.connection = Database.connect(**kwargs) self.connection.set_converter_class(DjangoMySQLConverter) cursor = self.connection.cursor() return cursor def _rollback(self): try: BaseDatabaseWrapper._rollback(self) except Database.NotSupportedError: pass def get_server_version(self): if not self.server_version: if not self._valid_connection(): self.cursor() self.server_version = self.connection.get_server_version() #m = server_version_re.match(self.connection.get_server_version()) #if not m: # raise Exception('Unable to determine MySQL version from version string %r' % self.connection.get_server_version()) #self.server_version = tuple([int(x) for x in m.groups()]) return self.server_version