1、存在毫秒导致的日期判断错误

mec-biz/src/main/resources/config/mybatis/StudentMapper.xml

@@ -24,7 +24,7 @@
 	</select>
 
 	<select id="lockUser" resultType="int">
-		SELECT * FROM sys_user WHERE id_=#{userId} FOR UPDATE
+		SELECT id_ FROM sys_user WHERE id_=#{userId} FOR UPDATE
 	</select>
 	
 	<!-- 向数据库增加一条记录 -->