select * from t_user where userName = #{userName} update t_user password=#{password}, where id = #{id} select * from t_user where id = #{id} insert into t_user (userName, password, type) values (#{userName}, #{password}, #{type}); select * from t_user and userName like #{userName} and type = #{type} and type !='管理员' limit #{start},#{size} select count(*) from t_user and userName like #{userName} and type = #{type} and type !='管理员'