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274 lines
8.3 KiB
274 lines
8.3 KiB
3 years ago
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# mysql/oursql.py
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# Copyright (C) 2005-2022 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: https://www.opensource.org/licenses/mit-license.php
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"""
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.. dialect:: mysql+oursql
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:name: OurSQL
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:dbapi: oursql
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:connectstring: mysql+oursql://<user>:<password>@<host>[:<port>]/<dbname>
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:url: https://packages.python.org/oursql/
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.. note::
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The OurSQL MySQL dialect is legacy and is no longer supported upstream,
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and is **not tested as part of SQLAlchemy's continuous integration**.
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The recommended MySQL dialects are mysqlclient and PyMySQL.
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.. deprecated:: 1.4 The OurSQL DBAPI is deprecated and will be removed
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in a future version. Please use one of the supported DBAPIs to
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connect to mysql.
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Unicode
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-------
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Please see :ref:`mysql_unicode` for current recommendations on unicode
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handling.
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"""
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from .base import BIT
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from .base import MySQLDialect
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from .base import MySQLExecutionContext
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from ... import types as sqltypes
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from ... import util
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class _oursqlBIT(BIT):
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def result_processor(self, dialect, coltype):
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"""oursql already converts mysql bits, so."""
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return None
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class MySQLExecutionContext_oursql(MySQLExecutionContext):
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@property
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def plain_query(self):
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return self.execution_options.get("_oursql_plain_query", False)
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class MySQLDialect_oursql(MySQLDialect):
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driver = "oursql"
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supports_statement_cache = True
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if util.py2k:
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supports_unicode_binds = True
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supports_unicode_statements = True
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supports_native_decimal = True
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supports_sane_rowcount = True
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supports_sane_multi_rowcount = True
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execution_ctx_cls = MySQLExecutionContext_oursql
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colspecs = util.update_copy(
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MySQLDialect.colspecs, {sqltypes.Time: sqltypes.Time, BIT: _oursqlBIT}
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)
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@classmethod
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def dbapi(cls):
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util.warn_deprecated(
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"The OurSQL DBAPI is deprecated and will be removed "
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"in a future version. Please use one of the supported DBAPIs to "
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"connect to mysql.",
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version="1.4",
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)
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return __import__("oursql")
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def do_execute(self, cursor, statement, parameters, context=None):
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"""Provide an implementation of
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*cursor.execute(statement, parameters)*."""
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if context and context.plain_query:
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cursor.execute(statement, plain_query=True)
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else:
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cursor.execute(statement, parameters)
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def do_begin(self, connection):
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connection.cursor().execute("BEGIN", plain_query=True)
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def _xa_query(self, connection, query, xid):
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if util.py2k:
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arg = connection.connection._escape_string(xid)
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else:
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charset = self._connection_charset
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arg = connection.connection._escape_string(
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xid.encode(charset)
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).decode(charset)
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arg = "'%s'" % arg
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connection.execution_options(_oursql_plain_query=True).exec_driver_sql(
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query % arg
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)
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# Because mysql is bad, these methods have to be
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# reimplemented to use _PlainQuery. Basically, some queries
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# refuse to return any data if they're run through
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# the parameterized query API, or refuse to be parameterized
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# in the first place.
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def do_begin_twophase(self, connection, xid):
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self._xa_query(connection, "XA BEGIN %s", xid)
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def do_prepare_twophase(self, connection, xid):
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self._xa_query(connection, "XA END %s", xid)
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self._xa_query(connection, "XA PREPARE %s", xid)
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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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self._xa_query(connection, "XA END %s", xid)
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self._xa_query(connection, "XA ROLLBACK %s", xid)
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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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self._xa_query(connection, "XA COMMIT %s", xid)
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# Q: why didn't we need all these "plain_query" overrides earlier ?
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# am i on a newer/older version of OurSQL ?
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def has_table(self, connection, table_name, schema=None):
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return MySQLDialect.has_table(
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self,
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connection.connect().execution_options(_oursql_plain_query=True),
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table_name,
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schema,
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)
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def get_table_options(self, connection, table_name, schema=None, **kw):
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return MySQLDialect.get_table_options(
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self,
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connection.connect().execution_options(_oursql_plain_query=True),
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table_name,
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schema=schema,
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**kw
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)
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def get_columns(self, connection, table_name, schema=None, **kw):
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return MySQLDialect.get_columns(
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self,
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connection.connect().execution_options(_oursql_plain_query=True),
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table_name,
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schema=schema,
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**kw
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)
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def get_view_names(self, connection, schema=None, **kw):
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return MySQLDialect.get_view_names(
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self,
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connection.connect().execution_options(_oursql_plain_query=True),
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schema=schema,
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**kw
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)
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def get_table_names(self, connection, schema=None, **kw):
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return MySQLDialect.get_table_names(
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self,
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connection.connect().execution_options(_oursql_plain_query=True),
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schema,
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)
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def get_schema_names(self, connection, **kw):
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return MySQLDialect.get_schema_names(
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self,
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connection.connect().execution_options(_oursql_plain_query=True),
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**kw
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)
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def initialize(self, connection):
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return MySQLDialect.initialize(
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self, connection.execution_options(_oursql_plain_query=True)
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)
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def _show_create_table(
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self, connection, table, charset=None, full_name=None
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):
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return MySQLDialect._show_create_table(
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self,
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connection.connect(close_with_result=True).execution_options(
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_oursql_plain_query=True
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),
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table,
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charset,
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full_name,
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)
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def is_disconnect(self, e, connection, cursor):
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if isinstance(e, self.dbapi.ProgrammingError):
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return (
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e.errno is None
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and "cursor" not in e.args[1]
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and e.args[1].endswith("closed")
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)
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else:
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return e.errno in (2006, 2013, 2014, 2045, 2055)
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def create_connect_args(self, url):
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opts = url.translate_connect_args(
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database="db", username="user", password="passwd"
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)
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opts.update(url.query)
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util.coerce_kw_type(opts, "port", int)
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util.coerce_kw_type(opts, "compress", bool)
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util.coerce_kw_type(opts, "autoping", bool)
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util.coerce_kw_type(opts, "raise_on_warnings", bool)
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util.coerce_kw_type(opts, "default_charset", bool)
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if opts.pop("default_charset", False):
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opts["charset"] = None
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else:
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util.coerce_kw_type(opts, "charset", str)
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opts["use_unicode"] = opts.get("use_unicode", True)
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util.coerce_kw_type(opts, "use_unicode", 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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opts.setdefault("found_rows", True)
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ssl = {}
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for key in [
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"ssl_ca",
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"ssl_key",
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"ssl_cert",
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"ssl_capath",
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"ssl_cipher",
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]:
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if key in opts:
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ssl[key[4:]] = opts[key]
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util.coerce_kw_type(ssl, key[4:], str)
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del opts[key]
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if ssl:
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opts["ssl"] = ssl
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return [[], opts]
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def _extract_error_code(self, exception):
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return exception.errno
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def _detect_charset(self, connection):
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"""Sniff out the character set in use for connection results."""
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return connection.connection.charset
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def _compat_fetchall(self, rp, charset=None):
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"""oursql isn't super-broken like MySQLdb, yaaay."""
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return rp.fetchall()
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def _compat_fetchone(self, rp, charset=None):
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"""oursql isn't super-broken like MySQLdb, yaaay."""
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return rp.fetchone()
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def _compat_first(self, rp, charset=None):
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return rp.first()
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dialect = MySQLDialect_oursql
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