class_id, school_id, grade, class_name select from sz_sch_class where class_id = #{classId,jdbcType=INTEGER} insert into sz_sch_class (class_id, school_id, grade, class_name) values (#{emp.classId,jdbcType=INTEGER}, #{emp.schoolId,jdbcType=INTEGER}, #{emp.grade,jdbcType=VARCHAR}, #{emp.className,jdbcType=VARCHAR}) update sz_sch_class set school_id = #{schoolId,jdbcType=INTEGER}, grade = #{grade,jdbcType=VARCHAR}, class_name = #{className,jdbcType=VARCHAR}, where class_id = #{classId,jdbcType=INTEGER} select * from sz_sch_class where school_id = #{schoolId} select * from sz_sch_class where school_id = #{schoolId} and grade = #{grade} delete from sz_sch_class where school_id = #{schoolId} select * from sz_sch_class where school_id = #{schoolId} and class_name = #{className} and grade = #{grade}