"""Support for the MySQL database via the MySQL Connector/Python adapter.
MySQL Connector/Python is available at:
https://launchpad.net/myconnpy
Connecting
-----------
Connect string format::
mysql+mysqlconnector://<user>:<password>@<host>[:<port>]/<dbname>
"""
import re
from sqlalchemy.dialects.mysql.base import (MySQLDialect
MySQLExecutionContext, MySQLCompiler, MySQLIdentifierPreparer,
BIT)
from sqlalchemy.engine import base
from sqlalchemy.sql import operators
from sqlalchemy import exc,log,schema,sql,types
from sqlalchemy import processors
class MySQLExecutionContext_mysqlconnector(MySQLExecutionContext):
def get_lastrowid(self):
return self.cursor.lastrowid
class MySQLCompiler_mysqlconnector(MySQLCompiler):
def visit_mod(self, binary, **kw):
return self.process(binary.left) + " %% " + self.process(binary.right)
def post_process_text(self, text):
return text.replace('%', '%%')
class MySQLIdentifierPreparer_mysqlconnector(MySQLIdentifierPreparer):
def _escape_identifier(self, value):
value = value.replace(self.escape_quote, self.escape_to_quote)
return value.replace("%", "%%")
class _myconnpyBIT(BIT):
def result_processor(self, dialect, coltype):
"""MySQL-connector already converts mysql bits, so."""
return None
class MySQLDialect_mysqlconnector(MySQLDialect):
driver = 'mysqlconnector'
supports_unicode_statements = True
supports_unicode_binds = True
supports_sane_rowcount = True
supports_sane_multi_rowcount = True
supports_native_decimal = True
default_paramstyle = 'format'
execution_ctx_cls = MySQLExecutionContext_mysqlconnector
statement_compiler = MySQLCompiler_mysqlconnector
preparer = MySQLIdentifierPreparer_mysqlconnector
colspecs = util.update_copy(
MySQLDialect.colspecs,
{
BIT: _myconnpyBIT,
}
)
@classmethod
def dbapi(cls):
from mysql import connector
return connector
def create_connect_args(self, url):
opts = url.translate_connect_args(username='user')
opts.update(url.query)
util.coerce_kw_type(opts, 'buffered', bool)
util.coerce_kw_type(opts, 'raise_on_warnings', bool)
opts['buffered'] = True
opts['raise_on_warnings'] = True
# FOUND_ROWS must be set in ClientFlag to enable
# supports_sane_rowcount.
if self.dbapi is not None:
try:
from mysql.connector.constants import ClientFlag
client_flags = opts.get('client_flags', ClientFlag.get_default())
client_flags |= ClientFlag.FOUND_ROWS
opts['client_flags'] = client_flags
except:
pass
return [[], opts]
def _get_server_version_info(self, connection):
dbapi_con = connection.connection
from mysql.connector.constants import ClientFlag
dbapi_con.set_client_flag(ClientFlag.FOUND_ROWS)
version = dbapi_con.get_server_version()
return tuple(version)
def _detect_charset(self, connection):
return connection.connection.get_characterset_info()
def _extract_error_code(self, exception):
try:
return exception.orig.errno
except AttributeError:
return None
def is_disconnect(self, e):
errnos = (2006, 2013, 2014, 2045, 2055, 2048)
exceptions = (self.dbapi.OperationalError,self.dbapi.InterfaceError)
if isinstance(e, exceptions):
return e.errno in errnos
else:
return False
def _compat_fetchall(self, rp, charset=None):
return rp.fetchall()
def _compat_fetchone(self, rp, charset=None):
return rp.fetchone()
dialect = MySQLDialect_mysqlconnector
|