spring boot——spring boot的基本配置——spring boot整合mybatis——本地实例运行——删除操作——int类型——根据name删除数据...

约定不等于承诺〃 2024-03-30 14:19 23阅读 0赞

pojo类：

package org.example.entity;
    
    public class MyUser
    {
        private int id;
        private String name;
        private int age;
    
    
        public int getId() {
            return id;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        @Override
        public String toString() {
            return "MyUser{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", age=" + age +
                    '}';
        }
    }

![6653ee66653f2e55063d6dbbc53f35a9.png][]

mapper文件：

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper
    PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
    "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="org.example.mapper.UserMapper">
        <select id="findAll" resultType="org.example.entity.MyUser">
            select * from users
        </select>
    
        <insert id="saveUser" parameterType="org.example.entity.MyUser">
            insert into users(id,name,age) values(#{id},#{name},#{age})
        </insert>
    
        <insert id="saveUser2" parameterType="org.example.entity.MyUser">
            insert into users(id,name,age) values(#{id},#{name},#{age})
        </insert>
    
        <insert id="saveInsertUser" parameterType="org.example.entity.MyUser">
            <selectKey keyProperty="id" keyColumn="id" order="AFTER" resultType="int">
                SELECT LAST_INSERT_ID();
            </selectKey>
            insert into users(id,name,age) values(#{id},#{name},#{age})
        </insert>
    
        <update id="updateUser" parameterType="org.example.entity.MyUser">
            update users set name = #{name},age = #{age} where id = #{id}
        </update>
    
        <delete id="deleteUser" parameterType="java.lang.Integer">
            delete from users where id = #{id}
        </delete>
    
        <delete id="deleteUserByName" parameterType="java.lang.String">
            delete from users where name = #{name}
        </delete>
    
    </mapper>

![1880b0d977f01bead007c07d85f4fdd6.png][]

mapper接口：

package org.example.mapper;
    
    import org.example.entity.MyUser;
    import org.apache.ibatis.annotations.Mapper;
    
    import java.util.List;
    
    @Mapper
    public interface UserMapper
    {
    
        public List<MyUser> findAll();
    
        void saveUser(MyUser user);
    
        int saveUser2(MyUser user);
    
        int saveInsertUser(MyUser user);
    
        int updateUser(MyUser user);
    
        int deleteUser(Integer id);
    
        int deleteUserByName(String name);
    
    }

![d2950a97d97cba8742b306030399022a.png][]

service接口：

package org.example.service;
    
    
    import org.example.entity.MyUser;
    
    import java.util.List;
    
    public interface UserService
    {
        List<MyUser> findAll();
    
        void saveUser(MyUser user);
    
        int saveUser2(MyUser user);
    
        int saveInsertUser(MyUser user);
    
        int updateUser(MyUser user);
    
        int deleteUser(Integer id);
    
        int deleteUserByName(String name);
    
    }

![b2b441f78341ac4311f60e778a9fe632.png][]

实现service接口：

package org.example.service.Impl;
    
    import org.example.entity.MyUser;
    import org.example.mapper.UserMapper;
    import org.example.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import java.util.List;
    
    @Service
    public class UserServiceImpl implements UserService
    {
        @Autowired
        UserMapper userMapper;
    
        @Override
        public List<MyUser> findAll()
        {
            return userMapper.findAll();
        }
    
        @Override
        public void saveUser(MyUser user)
        {
            userMapper.saveUser(user);
        }
    
        public int saveUser2(MyUser user)
        {
            return userMapper.saveUser2(user);
        }
    
        public int saveInsertUser(MyUser user)
        {
    
            return userMapper.saveInsertUser(user);
        }
    
        public int updateUser(MyUser user)
        {
            return userMapper.updateUser(user);
        }
    
    
        public int deleteUser(Integer id)
        {
            return userMapper.deleteUser(id);
        }
    
        public int deleteUserByName(String name)
        {
            return userMapper.deleteUserByName(name);
        }
    
    }

![61c7a1a9ea96cb9d3132093a407655b4.png][]

控制器：

package org.example.controller;
    
    import java.util.List;
    import org.example.entity.MyUser;
    import org.example.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class MyUserController
    {
        @Autowired
        private UserService userService;
    
        @GetMapping(value = "/1")
        public List<MyUser> home1()
        {
            // 查询所有网站
            List<MyUser> users = userService.findAll();
    
            for (MyUser user : users)
            {
                System.out.println(user.getId()+"  "+user.getName()+"  "+user.getAge());
            }
    
            return users;
        }
    
        @GetMapping(value = "/2")
        public void home2()
        {
            MyUser user2 = new MyUser();
            user2.setName("TTT");
            user2.setAge(7878);
    
            userService.saveUser(user2);
    
        }
    
        @GetMapping(value = "/3")
        public int home3()
        {
            MyUser user2 = new MyUser();
            user2.setName("RRR");
            user2.setAge(6666);
    
            int a = userService.saveUser2(user2);
    
            System.out.println(a);
    
            return a;
    
        }
    
        @GetMapping(value = "/4")
        public int home4()
        {
            MyUser user2 = new MyUser();
            user2.setName("ccc");
            user2.setAge(321123);
    
            userService.saveInsertUser(user2);
    
            int a = user2.getId();
    
            System.out.println(a);
    
            System.out.println(user2);
    
            return a;
    
        }
    
        @GetMapping(value = "/5")
        public int updateUser()
        {
            MyUser user2 = new MyUser();
            user2.setId(1013);
            user2.setName("sprint-boot-1013");
            user2.setAge(199999);
    
            int a = userService.updateUser(user2);
    
            System.out.println(a);
    
            return a;
    
        }
    
    
        @GetMapping(value = "/6")
        public int deleteUser()
        {
            int a = userService.deleteUser(1012);
    
            System.out.println(a);
    
            return a;
    
        }
    
        @GetMapping(value = "/7")
        public int deleteUserByName()
        {
            int a = userService.deleteUserByName("sprint-boot-1013");
    
            System.out.println(a);
    
            return a;
    
        }
    
    }

![3398e88e2035ae2a6840b4f88a3494e6.png][]

运行前数据：

![8a587357be0f2ec1d28c8a3d96808cf2.png][]

运行：

![9f7559156c3579db91da2d7ce228f810.png][]

![f9e6c192358d994db3a102a2c5249672.png][]

![0063a1472fc0154a73a0f386e6810ba2.png][]

[6653ee66653f2e55063d6dbbc53f35a9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/af56649fc2c3430285c21588807d51ab.png
[1880b0d977f01bead007c07d85f4fdd6.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/0b2ce845165f406db7c54e3509350eab.png
[d2950a97d97cba8742b306030399022a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/31c371dbccd94728bff021b8e86cbb1e.png
[b2b441f78341ac4311f60e778a9fe632.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/172fdbe0759e423f9cb22c564ba1e236.png
[61c7a1a9ea96cb9d3132093a407655b4.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/054d088df742498ab316ba90c0aa494c.png
[3398e88e2035ae2a6840b4f88a3494e6.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/b0dcc802adea4c18821fcebf69ea358a.png
[8a587357be0f2ec1d28c8a3d96808cf2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/ad6839fd6bd24d2aaec53d2276564366.png
[9f7559156c3579db91da2d7ce228f810.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/42a3f850e55748b2bf64820ca1e42b37.png
[f9e6c192358d994db3a102a2c5249672.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/2ad00966b0e44d10b888ccbc550c2149.png
[0063a1472fc0154a73a0f386e6810ba2.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/8c507cd1ab184defaa66241197532d1d.png