238 lines
7.3 KiB
Python
238 lines
7.3 KiB
Python
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# mysql/mariadbconnector.py
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# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""
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.. dialect:: mysql+mariadbconnector
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:name: MariaDB Connector/Python
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:dbapi: mariadb
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:connectstring: mariadb+mariadbconnector://<user>:<password>@<host>[:<port>]/<dbname>
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:url: https://pypi.org/project/mariadb/
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Driver Status
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-------------
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MariaDB Connector/Python enables Python programs to access MariaDB and MySQL
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databases using an API which is compliant with the Python DB API 2.0 (PEP-249).
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It is written in C and uses MariaDB Connector/C client library for client server
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communication.
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Note that the default driver for a ``mariadb://`` connection URI continues to
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be ``mysqldb``. ``mariadb+mariadbconnector://`` is required to use this driver.
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.. mariadb: https://github.com/mariadb-corporation/mariadb-connector-python
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""" # noqa
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import re
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from .base import MySQLCompiler
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from .base import MySQLDialect
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from .base import MySQLExecutionContext
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from .base import MySQLIdentifierPreparer
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from ... import sql
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from ... import util
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mariadb_cpy_minimum_version = (1, 0, 1)
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class MySQLExecutionContext_mariadbconnector(MySQLExecutionContext):
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def create_server_side_cursor(self):
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return self._dbapi_connection.cursor(buffered=False)
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def create_default_cursor(self):
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return self._dbapi_connection.cursor(buffered=True)
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class MySQLCompiler_mariadbconnector(MySQLCompiler):
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pass
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class MySQLIdentifierPreparer_mariadbconnector(MySQLIdentifierPreparer):
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pass
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class MySQLDialect_mariadbconnector(MySQLDialect):
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driver = "mariadbconnector"
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supports_statement_cache = True
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# set this to True at the module level to prevent the driver from running
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# against a backend that server detects as MySQL. currently this appears to
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# be unnecessary as MariaDB client libraries have always worked against
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# MySQL databases. However, if this changes at some point, this can be
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# adjusted, but PLEASE ADD A TEST in test/dialect/mysql/test_dialect.py if
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# this change is made at some point to ensure the correct exception
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# is raised at the correct point when running the driver against
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# a MySQL backend.
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# is_mariadb = True
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supports_unicode_statements = True
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encoding = "utf8mb4"
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convert_unicode = 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 = "qmark"
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execution_ctx_cls = MySQLExecutionContext_mariadbconnector
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statement_compiler = MySQLCompiler_mariadbconnector
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preparer = MySQLIdentifierPreparer_mariadbconnector
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supports_server_side_cursors = True
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@util.memoized_property
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def _dbapi_version(self):
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if self.dbapi and hasattr(self.dbapi, "__version__"):
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return tuple(
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[
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int(x)
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for x in re.findall(
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r"(\d+)(?:[-\.]?|$)", self.dbapi.__version__
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)
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]
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)
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else:
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return (99, 99, 99)
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def __init__(self, **kwargs):
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super(MySQLDialect_mariadbconnector, self).__init__(**kwargs)
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self.paramstyle = "qmark"
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if self.dbapi is not None:
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if self._dbapi_version < mariadb_cpy_minimum_version:
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raise NotImplementedError(
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"The minimum required version for MariaDB "
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"Connector/Python is %s"
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% ".".join(str(x) for x in mariadb_cpy_minimum_version)
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)
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@classmethod
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def dbapi(cls):
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return __import__("mariadb")
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def is_disconnect(self, e, connection, cursor):
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if super(MySQLDialect_mariadbconnector, self).is_disconnect(
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e, connection, cursor
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):
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return True
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elif isinstance(e, self.dbapi.Error):
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str_e = str(e).lower()
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return "not connected" in str_e or "isn't valid" in str_e
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else:
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return False
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def create_connect_args(self, url):
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opts = url.translate_connect_args()
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int_params = [
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"connect_timeout",
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"read_timeout",
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"write_timeout",
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"client_flag",
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"port",
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"pool_size",
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]
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bool_params = [
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"local_infile",
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"ssl_verify_cert",
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"ssl",
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"pool_reset_connection",
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]
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for key in int_params:
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util.coerce_kw_type(opts, key, int)
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for key in bool_params:
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util.coerce_kw_type(opts, key, bool)
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# FOUND_ROWS must be set in CLIENT_FLAGS to enable
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# supports_sane_rowcount.
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client_flag = opts.get("client_flag", 0)
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if self.dbapi is not None:
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try:
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CLIENT_FLAGS = __import__(
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self.dbapi.__name__ + ".constants.CLIENT"
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).constants.CLIENT
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client_flag |= CLIENT_FLAGS.FOUND_ROWS
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except (AttributeError, ImportError):
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self.supports_sane_rowcount = False
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opts["client_flag"] = client_flag
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return [[], opts]
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def _extract_error_code(self, exception):
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try:
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rc = exception.errno
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except:
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rc = -1
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return rc
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def _detect_charset(self, connection):
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return "utf8mb4"
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_isolation_lookup = set(
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[
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"SERIALIZABLE",
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"READ UNCOMMITTED",
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"READ COMMITTED",
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"REPEATABLE READ",
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"AUTOCOMMIT",
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]
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)
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def _set_isolation_level(self, connection, level):
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if level == "AUTOCOMMIT":
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connection.autocommit = True
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else:
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connection.autocommit = False
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super(MySQLDialect_mariadbconnector, self)._set_isolation_level(
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connection, level
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)
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def do_begin_twophase(self, connection, xid):
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connection.execute(
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sql.text("XA BEGIN :xid").bindparams(
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sql.bindparam("xid", xid, literal_execute=True)
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)
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)
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def do_prepare_twophase(self, connection, xid):
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connection.execute(
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sql.text("XA END :xid").bindparams(
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sql.bindparam("xid", xid, literal_execute=True)
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)
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)
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connection.execute(
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sql.text("XA PREPARE :xid").bindparams(
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sql.bindparam("xid", xid, literal_execute=True)
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)
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)
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def do_rollback_twophase(
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self, connection, xid, is_prepared=True, recover=False
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):
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if not is_prepared:
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connection.execute(
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sql.text("XA END :xid").bindparams(
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sql.bindparam("xid", xid, literal_execute=True)
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)
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)
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connection.execute(
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sql.text("XA ROLLBACK :xid").bindparams(
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sql.bindparam("xid", xid, literal_execute=True)
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)
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)
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def do_commit_twophase(
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self, connection, xid, is_prepared=True, recover=False
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):
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if not is_prepared:
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self.do_prepare_twophase(connection, xid)
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connection.execute(
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sql.text("XA COMMIT :xid").bindparams(
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sql.bindparam("xid", xid, literal_execute=True)
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)
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)
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dialect = MySQLDialect_mariadbconnector
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