morro

sqlalchemy/dialects/mysql/zxjdbc.py

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