WHERE 1 = 1 AND id = '${id}' AND stdname like '%${stdName}%' AND stdgender = #{stdGender} select id , stdno , stdname , stdgender , stdage , stdmajor , stdclass from students select id , stdno , stdname , stdgender , stdage , stdmajor , stdclass from students and stdgender in ( select stdgender from students ) select id , stdno , stdname , stdgender , stdage , stdmajor , stdclass from roles delete from students where id=#{id}