，报错错误连接数据库 [qq] : org.pentaho.di.core.exception.KettleDatabaseException:Error occurred while trying to connect to the databaseDriver class \'org.gjt.mm.mysql.Driver\' could not be found, make sure the \'MySQL\' driver (jar file) is installed.org.gjt.mm.mysql.Driverorg.pentaho.di.core.exception.KettleDatabaseException:Error occurred while trying to connect to the databaseDriver class \'org.gjt.mm.mysql.Driver\' could not be found, make sure the \'MySQL\' driver (jar file) is installed.org.gjt.mm.mysql.Driver