112 lines
3.6 KiB
Python
112 lines
3.6 KiB
Python
"""Support for the MySQL database via Jython's zxjdbc JDBC connector.
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JDBC Driver
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-----------
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The official MySQL JDBC driver is at
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http://dev.mysql.com/downloads/connector/j/.
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Connecting
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----------
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Connect string format:
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mysql+zxjdbc://<user>:<password>@<hostname>[:<port>]/<database>
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Character Sets
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--------------
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SQLAlchemy zxjdbc dialects pass unicode straight through to the
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zxjdbc/JDBC layer. To allow multiple character sets to be sent from the
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MySQL Connector/J JDBC driver, by default SQLAlchemy sets its
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``characterEncoding`` connection property to ``UTF-8``. It may be
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overriden via a ``create_engine`` URL parameter.
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"""
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import re
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from sqlalchemy import types as sqltypes, util
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from sqlalchemy.connectors.zxJDBC import ZxJDBCConnector
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from sqlalchemy.dialects.mysql.base import BIT, MySQLDialect, MySQLExecutionContext
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class _ZxJDBCBit(BIT):
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def result_processor(self, dialect, coltype):
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"""Converts boolean or byte arrays from MySQL Connector/J to longs."""
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def process(value):
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if value is None:
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return value
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if isinstance(value, bool):
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return int(value)
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v = 0L
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for i in value:
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v = v << 8 | (i & 0xff)
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value = v
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return value
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return process
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class MySQLExecutionContext_zxjdbc(MySQLExecutionContext):
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def get_lastrowid(self):
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cursor = self.create_cursor()
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cursor.execute("SELECT LAST_INSERT_ID()")
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lastrowid = cursor.fetchone()[0]
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cursor.close()
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return lastrowid
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class MySQLDialect_zxjdbc(ZxJDBCConnector, MySQLDialect):
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jdbc_db_name = 'mysql'
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jdbc_driver_name = 'com.mysql.jdbc.Driver'
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execution_ctx_cls = MySQLExecutionContext_zxjdbc
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colspecs = util.update_copy(
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MySQLDialect.colspecs,
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{
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sqltypes.Time: sqltypes.Time,
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BIT: _ZxJDBCBit
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}
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)
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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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# Prefer 'character_set_results' for the current connection over the
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# value in the driver. SET NAMES or individual variable SETs will
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# change the charset without updating the driver's view of the world.
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#
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# If it's decided that issuing that sort of SQL leaves you SOL, then
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# this can prefer the driver value.
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rs = connection.execute("SHOW VARIABLES LIKE 'character_set%%'")
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opts = dict((row[0], row[1]) for row in self._compat_fetchall(rs))
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for key in ('character_set_connection', 'character_set'):
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if opts.get(key, None):
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return opts[key]
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util.warn("Could not detect the connection character set. Assuming latin1.")
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return 'latin1'
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def _driver_kwargs(self):
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"""return kw arg dict to be sent to connect()."""
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return dict(characterEncoding='UTF-8', yearIsDateType='false')
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def _extract_error_code(self, exception):
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# e.g.: DBAPIError: (Error) Table 'test.u2' doesn't exist
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# [SQLCode: 1146], [SQLState: 42S02] 'DESCRIBE `u2`' ()
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m = re.compile(r"\[SQLCode\: (\d+)\]").search(str(exception.orig.args))
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c = m.group(1)
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if c:
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return int(c)
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def _get_server_version_info(self,connection):
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dbapi_con = connection.connection
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version = []
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r = re.compile('[.\-]')
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for n in r.split(dbapi_con.dbversion):
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try:
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version.append(int(n))
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except ValueError:
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version.append(n)
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return tuple(version)
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dialect = MySQLDialect_zxjdbc
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