ID_, SIMPLE_NAME_, PATH_, DESC_, MD5_ select bec.ID_ AS "ID_" ,SIMPLE_NAME_,PATH_,MD5_,bec.TYPE_,bej.DESC_ AS "JAR_ID_" from bpm_extend_class bec LEFT JOIN bpm_extend_jar bej on bec.JAR_ID_ = bej.ID_ ${ew.customSqlSegment} select * from bpm_extend_class where SIMPLE_NAME_ = #{simpleName}