PDI的steps：（2：Add a checksum）

steps的连接：

http://wiki.pentaho.com/display/EAI/Pentaho+Data+Integration+Steps

名称：Add a checksum

id：CheckSum

种类：转换；

描述：对input的每一行，加一个checksum列。

所属类：org.pentaho.di.trans.steps.checksum.CheckSumMeta

Option	Description
Step name	Name of the step. Note: This name has to be unique in a single transformation.
Type	The type of checksum that needs to be calculated.  These are the types that are available: CRC32 : 32-bit Cyclic Redundancy Check : http://en.wikipedia.org/wiki/Cyclic_redundancy_check ADLER 32 : Checksum algorithm by Mark Adler: http://en.wikipedia.org/wiki/Adler-32 MD5 : Message Digest algorithm 5 : http://en.wikipedia.org/wiki/MD5 SHA-1 : Secure Hash Algorithm 1 : http://en.wikipedia.org/wiki/SHA-1
Result field	The name of the result field containing the checksum
Fields used in the checksum	The names of the fields to include in the checksum calculation. Note: You can use the "Get Fields" button to insert all input fields from previous steps.

PDI还专门提供了一个CRC32的例子。