kettle：是一个开源ETL工具。kettle提供了基于java的图形化界面，使用很方便，kettle的ETL工具集合也比较多，常用的ETL工具都包含了。(关于数据源的）-kettle: is an open source ETL tool. kettle provides a java-based graphical interface, very easy to use, kettle collections are also o