kettle增量抽取mysql

<?xml version="1.0" encoding="UTF-8"?>
<transformation>
  <info>
    <name>MySQL Incremental Extraction</name>
    <description>Incrementally extract data from MySQL</description>
  </info>
  <step id="1">
    <name>Table Input</name>
    <type>TableInput</type>
    <description>Read data from MySQL table</description>
    <distribute>Y</distribute>
    <sort>Y</sort>
    <integer>1</integer>
    <lookup>
      <key>id</key>
      <name>table_input</name>
      <database>
        <name>mysql_db</name>
        <server>localhost</server>
        <port>3306</port>
        <username>user</username>
        <password>password</password>
      </database>
      <table>source_table</table>
      <keyLookup>id</keyLookup>
      <keyCondition>id > ${last_id}</keyCondition>
    </lookup>
  </step>
  <step id="2">
    <name>Table Output</name>
    <type>TableOutput</type>
    <description>Write data to target table</description>
    <distribute>Y</distribute>
    <sort>Y</sort>
    <integer>2</integer>
    <lookup>
      <key>id</key>
      <name>table_output</name>
      <database>
        <name>target_db</name>
        <server>localhost</server>
        <port>3306</port>
        <username>user</username>
        <password>password</password>
      </database>
      <table>target_table</table>
    </lookup>
  </step>
  <step id="3">
    <name>Set Variable</name>
    <type>SetVariable</type>
    <description>Update last_id variable</description>
    <distribute>Y</distribute>
    <sort>Y</sort>
    <integer>3</integer>
    <lookup>
      <key>last_id</key>
      <name>set_variable</name>
      <variable>last_id</variable>
      <value>${table_input.last_id}</value>
    </lookup>
  </step>
  <hops>
    <hop>
      <from>Table Input</from>
      <to>Table Output</to>
    </hop>
    <hop>
      <from>Table Output</from>
      <to>Set Variable</to>
    </hop>
  </hops>
</transformation>