源代碼片段：
1 <insert id="addAdminAction" parameterType="x.x.x.RoleVo"> 2 <selectKey keyProperty="idRole, createdDate" resultType="x.x.x.RoleVo" order="BEFORE"> 3 select getid() idRole, to_char(sysdate, 'yyyy-mm-dd hh24:mi:ss') createdDate from dual 4 </selectKey> 5 <!-- insert sql--> 6 </insert>
報錯內容：
1 org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.executor.ExecutorException: Error selecting key or setting result to parameter object. Cause: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named ' createdDate' in 'class x.x.x.RoleVo'
原因：當keyProperty有多個目標列時，列關鍵字之間用逗號","分隔，並且不應有多余空格（即keyProperty="idRole, createdDate"間不應該有空格）。
正確代碼片段：
1 <insert id="addAdminAction" parameterType="x.x.x.RoleVo"> 2 <selectKey keyProperty="idRole,createdDate" resultType="x.x.x.RoleVo" order="BEFORE"> 3 select getid() idRole, to_char(sysdate, 'yyyy-mm-dd hh24:mi:ss') createdDate from dual 4 </selectKey> 5 <!-- insert sql--> 6 </insert>
一個空格引起的錯誤，個人覺得還是挺有意思的