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