Fixed DatabaseMetaData.getTables()
            returning views when they were not asked for as one of the
            requested table types.
          
            Added support for new precision-math
            DECIMAL type in MySQL 5.0.3 and up.
          
            Fixed ResultSet.getTime() on a
            NULL value for server-side prepared
            statements throws NPE.
          
            Made Connection.ping() a public method.
          
            DATE_FORMAT() queries returned as
            BLOBs from
            getObject(). (Bug#8868)
          
            ServerPreparedStatements now correctly
            “stream”
            BLOB/CLOB data to the
            server. You can configure the threshold chunk size using the
            JDBC URL property blobSendChunkSize (the
            default is 1MB).
          
            BlobFromLocator now uses correct
            identifier quoting when generating prepared statements.
          
            Server-side session variables can be preset at connection
            time by passing them as a comma-delimited list for the
            connection property sessionVariables.
          
            Fixed regression in ping() for users
            using autoReconnect=true.
          
            PreparedStatement.addBatch() doesn't work
            with server-side prepared statements and streaming
            BINARY data. (Bug#9040)
          
            DBMD.supportsMixedCase*Identifiers()
            returns wrong value on servers running on case-sensitive
            filesystems. (Bug#8800)
          
            Cannot use UTF-8 for characterSetResults
            configuration property. (Bug#9206)
          
            A continuation of Bug#8868, where functions used in queries
            that should return non-string types when resolved by
            temporary tables suddenly become opaque binary strings
            (work-around for server limitation). Also fixed fields with
            type of CHAR(n) CHARACTER SET BINARY to
            return correct/matching classes for
            RSMD.getColumnClassName() and
            ResultSet.getObject(). (Bug#9236)
          
            DBMD.supportsResultSetConcurrency() not
            returning true for forward-only/read-only
            result sets (we obviously support this). (Bug#8792)
          
            DATA_TYPE column from
            DBMD.getBestRowIdentifier() causes
            ArrayIndexOutOfBoundsException when
            accessed (and in fact, didn't return any value). (Bug#8803)
          
            Check for empty strings ('') when
            converting
            CHAR/VARCHAR column
            data to numbers, throw exception if
            emptyStringsConvertToZero configuration
            property is set to false (for
            backward-compatibility with 3.0, it is now set to
            true by default, but will most likely
            default to false in 3.2).
          
            PreparedStatement.getMetaData() inserts
            blank row in database under certain conditions when not
            using server-side prepared statements. (Bug#9320)
          
            Connection.canHandleAsPreparedStatement()
            now makes “best effort” to distinguish
            LIMIT clauses with placeholders in them
            from ones without in order to have fewer false positives
            when generating work-arounds for statements the server
            cannot currently handle as server-side prepared statements.
          
            Fixed build.xml to not compile
            log4j logging if log4j
            not available.
          
            Added support for the c3p0 connection pool's
            (http://c3p0.sf.net/) validation/connection
            checker interface which uses the lightweight
            COM_PING call to the server if available.
            To use it, configure your c3p0 connection pool's
            connectionTesterClassName property to use
            com.mysql.jdbc.integration.c3p0.MysqlConnectionTester.
          
            Better detection of LIMIT inside/outside
            of quoted strings so that the driver can more correctly
            determine whether a prepared statement can be prepared on
            the server or not.
          
Stored procedures with same name in different databases confuse the driver when it tries to determine parameter counts/types. (Bug#9319)
            Added finalizers to ResultSet and
            Statement implementations to be JDBC
            spec-compliant, which requires that if not explicitly
            closed, these resources should be closed upon garbage
            collection.
          
            Stored procedures with DECIMAL parameters
            with storage specifications that contained
            ‘,’ in them would fail. (Bug#9682)
          
            PreparedStatement.setObject(int, Object, int type,
            int scale) now uses scale value for
            BigDecimal instances.
          
            Statement.getMoreResults() could throw
            NPE when existing result set was
            .close()d. (Bug#9704)
          
The performance metrics feature now gathers information about number of tables referenced in a SELECT.
            The logging system is now automatically configured. If the
            value has been set by the user, via the URL property
            logger or the system property
            com.mysql.jdbc.logger, then use that,
            otherwise, autodetect it using the following steps:
          
Log4j, if it's available,
Then JDK1.4 logging,
                Then fallback to our STDERR logging.
              
            DBMD.getTables() shouldn't return tables
            if views are asked for, even if the database version doesn't
            support views. (Bug#9778)
          
            Fixed driver not returning true for
            -1 when
            ResultSet.getBoolean() was called on
            result sets returned from server-side prepared statements.
          
            Added a Manifest.MF file with
            implementation information to the .jar
            file.
          
            More tests in Field.isOpaqueBinary() to
            distinguish opaque binary (that is, fields with type
            CHAR(n) and CHARACTER SET
            BINARY) from output of various scalar and
            aggregate functions that return strings.
          
            Should accept null for catalog (meaning
            use current) in DBMD methods, even though it's not
            JDBC-compliant for legacy's sake. Disable by setting
            connection property
            nullCatalogMeansCurrent to
            false (which will be the default value in
            C/J 3.2.x). (Bug#9917)
          
            Should accept null for name patterns in
            DBMD (meaning ‘%’), even
            though it isn't JDBC compliant, for legacy's sake. Disable
            by setting connection property
            nullNamePatternMatchesAll to
            false (which will be the default value in
            C/J 3.2.x). (Bug#9769)
          
Ésta es una traducción del manual de referencia de MySQL, que puede encontrarse en dev.mysql.com. El manual de referencia original de MySQL está escrito en inglés, y esta traducción no necesariamente está tan actualizada como la versión original. Para cualquier sugerencia sobre la traducción y para señalar errores de cualquier tipo, no dude en dirigirse a mysql-es@vespito.com.

