提示：
错误连接数据库 [sql] : org.pentaho.di.core.exception.KettleDatabaseException:
Error occurred while trying to connect to the database
Driver class ‘net.sourceforge.jtds.jdbc.Driver’ could not be found, make sure the ‘MS SQL Server’ driver (jar file) is installed.
net.sourceforge.jtds.jdbc.Driver
。。。。
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原因是，kettle下载下来后没有相关数据库的驱动需要自己重新下载，连接sqlserver连不上，下载jtds.jar包放到kettle的libswt目录或者lib下，重新启动kettle即可。