先看错误：
错误连接数据库 [JDOrd] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occurred while trying to connect to the database
Error connecting to database: (using class org.gjt.mm.mysql.Driver)
Communications link failure
The last packet successfully received from the server was 0 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago.
org.pentaho.di.core.exception.KettleDatabaseException:
Error occurred while trying to connect to the database
Error connecting to database: (using class org.gjt.mm.mysql.Driver)
Communications link failure
The last packet successfully received from the server was 0 milliseconds ago. The last packet sent successfully to the server was 0 milliseconds ago.
kettle 链接mysql 报错了 ，找了好多问题，最后是因为mysql 版本 和 kettle jar包的驱动 不对，正常的最新的 都可以用，就我连着这个 mysql 5.7.37 版本有点怪（mysql版本查询，我Navicat能连上点击数据库右边就显示服务器版本号 就是了），最后才知道是
mysql驱动jar 文件适用MySQL5.7，本人亲测可用适用ieda成功连接到数据库（mysql-connector-java-5.1.25.jar）
这是下载jar的地址，点击下载
