mysql问题:String字符串怎样转换成sql查询的结果集

String aa = "1001";select aa as AA;           ---------------------
          |          AA        |
          |---------------------
          |          1001      |
          |---------------------现在String aa = "1001,1002";我想用mysql的sql语句查询结果：           ---------------------
          |          AA        |
          |---------------------
          |          1001      |
          |---------------------
          |          1002      |
          |---------------------