ztejiagn的专栏

a） package com.mybatis; import org.apache.ibatis.annotations.Select; public interface UserDao { @Select("select count(*) c from user;") public int countAll(); } 2.编写服务层接口代码（UserService.java） package com.mybatis; public in

LL AUTO_INCREMENT , `userName` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , `password` varchar(80) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , `comment` varchar(250) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAU

AUTO_INCREMENT , `userName` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , `password` varchar(80) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL , `comment` varchar(250) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT