错误详细:

错误连接数据库 [mysql_test] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occured while trying to connect to the database

Driver class 'org.gjt.mm.mysql.Driver' could not be found, make sure the 'MySQL' driver (jar file) is installed.
org.gjt.mm.mysql.Driver

解决方法：

需要将驱动包放在lib目录下本人的目录是在Kettle的lib下

D:\Software\kettle\kettle_5.1\lib\mysql-connector-java-5.1.46-bin.jar

对应的本人的CSDN地址：https://blog.csdn.net/Jiweilai1/article/details/86668261

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