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base.py
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/
base.py
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"""
MySQL database backend for Django.
Requires MySQLdb: http://sourceforge.net/projects/mysql-python
"""
from django.db.backends import util
try:
import MySQLdb as Database
except ImportError, e:
from django.core.exceptions import ImproperlyConfigured
raise ImproperlyConfigured, "Error loading MySQLdb module: %s" % e
from MySQLdb.converters import conversions
from MySQLdb.constants import FIELD_TYPE
import types
import re
DatabaseError = Database.DatabaseError
django_conversions = conversions.copy()
django_conversions.update({
types.BooleanType: util.rev_typecast_boolean,
FIELD_TYPE.DATETIME: util.typecast_timestamp,
FIELD_TYPE.DATE: util.typecast_date,
FIELD_TYPE.TIME: util.typecast_time,
})
# 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})')
# 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, w:
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(object):
def __init__(self, settings):
self.settings = settings
self.connection = None
self.queries = []
self.server_version = None
self.options = settings.DATABASE_OPTIONS
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):
settings = self.settings
if not self._valid_connection():
kwargs = {
'user': settings.DATABASE_USER,
'db': settings.DATABASE_NAME,
'passwd': settings.DATABASE_PASSWORD,
'conv': django_conversions,
}
if settings.DATABASE_HOST.startswith('/'):
kwargs['unix_socket'] = settings.DATABASE_HOST
else:
kwargs['host'] = settings.DATABASE_HOST
if settings.DATABASE_PORT:
kwargs['port'] = int(settings.DATABASE_PORT)
kwargs.update(self.options)
self.connection = Database.connect(**kwargs)
cursor = self.connection.cursor()
if self.connection.get_server_info() >= '4.1':
cursor.execute("SET NAMES 'utf8'")
if settings.DEBUG:
return util.CursorDebugWrapper(MysqlDebugWrapper(cursor), self)
return cursor
def _commit(self):
if self.connection:
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 get_server_version(self):
if not self.server_version:
if not self._valid_connection():
self.cursor()
m = server_version_re.match(self.connection.get_server_info())
if not m:
raise Exception('Unable to determine MySQL version from version string %r' % self.connection.get_server_info())
self.server_version = tuple([int(x) for x in m.groups()])
return self.server_version
supports_constraints = True
supports_compound_statements = True
def quote_name(name):
if name.startswith("`") and name.endswith("`"):
return name # Quoting once is enough.
return "`%s`" % name
dictfetchone = util.dictfetchone
dictfetchmany = util.dictfetchmany
dictfetchall = util.dictfetchall
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'
# 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'
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 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()"
def get_fulltext_search_sql(field_name):
return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name
def get_drop_foreignkey_sql():
return "DROP FOREIGN KEY"
def get_pk_default_value():
return "DEFAULT"
OPERATOR_MAPPING = {
'exact': '= %s',
'iexact': 'LIKE %s',
'contains': 'LIKE BINARY %s',
'icontains': 'LIKE %s',
'gt': '> %s',
'gte': '>= %s',
'lt': '< %s',
'lte': '<= %s',
'startswith': 'LIKE BINARY %s',
'endswith': 'LIKE BINARY %s',
'istartswith': 'LIKE %s',
'iendswith': 'LIKE %s',
}