mysql5.02驱动出现问题解决
今天在编写hql语句时出现如下错误，就是在mysql5.02.jar驱动下Sum函数不可用，后来发现是数据库驱动的问题,只要将mysql5驱动换一下就好了
java.sql.SQLException: Unknown type '246 in column 2 of 3 in binary-encoded result set.com.mysql.jdbc.MysqlIO.extractNativeEncodedColumn(MysqlIO.java:3710)com.mysql.jdbc.MysqlIO.unpackBinaryResultSetRow(MysqlIO.java:3620)com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1282)com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2198)com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:413)com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:1899)com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1347)
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