标签:mapper 入门 userMapper CRUD session user Mybatis id User
Mapper接口类
package com.PAG.mapper;
import com.PAG.pojo.User;
import java.util.List;
import java.util.Map;
public interface userMapper {
//查询所有用户信息
List<User> selectUser();
//通过id查询用户信息
User selectUserById(int id);
//通过用户名和密码查询用户信息
User selectUserByMap(Map<String,Object> map);
//增加用户
int addUser(User user);
//修改用户信息
int updateUser(User user);
//删除用户信息
int deleteUser(int id);
}
select
查询所有用户
<select id="selectUser" resultType="com.PAG.pojo.User">
select * from user
</select>
测试类
@Test
public void selectUser(){
SqlSession session = MybatisUtils.getSession();
userMapper mapper = session.getMapper(userMapper.class);
List<User> users = mapper.selectUser();
for (User user:users) {
System.out.println(user);
}
session.close();
}
通过id查询用户
<select id="selectUserById" resultType="com.PAG.pojo.User">
select * from user where id = #{id}
</select>
测试类
@Test
public void selectUserById(){
SqlSession session = MybatisUtils.getSession();
userMapper mapper = session.getMapper(userMapper.class);
User user = mapper.selectUserById(1);
System.out.println(user);
session.close();
}
通过名字和密码查询用户(Map)
<select id="selectUserByMap" parameterType="map" resultType="com.PAG.pojo.User">
select * from user where name = #{name} and pwd = #{pwd}
</select>
测试类
@Test
public void selectUserByMap(){
SqlSession session = MybatisUtils.getSession();
userMapper mapper = session.getMapper(userMapper.class);
Map<String, Object> map = new HashMap<String,Object>();
map.put("name","pag");
map.put("pwd","123456");
User user = mapper.selectUserByMap(map);
System.out.println(user);
session.close();
}
insert
<insert id="addUser" parameterType="com.PAG.pojo.User">
insert into user(id,name,pwd) values (#{id},#{name},#{pwd})
</insert>
测试类
@Test
public void addUser(){
SqlSession session = MybatisUtils.getSession();
userMapper mapper = session.getMapper(userMapper.class);
User user = new User(3,"p","1212");
int i = mapper.addUser(user);
System.out.println(i);
session.commit();
session.close();
}
update
<update id="updateUser" parameterType="com.PAG.pojo.User">
update user set name = #{name},pwd = #{pwd} where id = #{id}
</update>
测试类
@Test
public void updateUser(){
SqlSession session = MybatisUtils.getSession();
userMapper mapper = session.getMapper(userMapper.class);
User user = mapper.selectUserById(3);
user.setPwd("2333");
int i = mapper.updateUser(user);
System.out.println(i);
session.commit();
session.close();
}
delete
<delete id="deleteUser" parameterType="com.PAG.pojo.User">
delete from user where id = #{id}
</delete>
测试类
@Test
public void deleteUser(){
SqlSession session = MybatisUtils.getSession();
userMapper mapper = session.getMapper(userMapper.class);
int i = mapper.deleteUser(3);
System.out.println(i);
session.commit();
session.close();
}
}
标签:mapper,入门,userMapper,CRUD,session,user,Mybatis,id,User 来源: https://blog.csdn.net/FFFPAG/article/details/120476700
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