select student_id, direct_key from learn_student and direct_key = #{directKey} where student_id = #{studentId} insert into learn_student student_id, direct_key, #{studentId}, #{directKey}, update learn_student direct_key = #{directKey}, where student_id = #{studentId} delete from learn_student where student_id = #{studentId} delete from learn_student where student_id in #{studentId}