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id删除数据...

女爷i 2023-09-28 23:54 8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 +
                    '}';
        }
    }

![2770fe92a2ae6117b1b04103ec47cec4.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>
    
    </mapper>

![c049ba6bf0baa25f0d17e21e9d66fae5.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);
    
    }

![8d8e61f2fef6cc40f2e964e0386c96f3.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);
    
    }

![bb4d28cb2b54666b82cd5b7f090571d1.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);
        }
    
    }

![729a1bbfb03a9b7223bb790000733b5a.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;
    
        }
    
    }

![60c523206cdf1797a67ecf8081a95e0e.png][]

之前数据：

![17f4284bda05da9a9e7170c6bd0caf05.png][]

运行：

![d41a0ae083b0944e2519c594404707ad.png][]

![c27c8d76f3b3c1cd20391a2a76a86c37.png][]

![d14d6148a5f7ba1d18e3fb6dad8a2ce2.png][]

[2770fe92a2ae6117b1b04103ec47cec4.png]: https://img-blog.csdnimg.cn/img_convert/2770fe92a2ae6117b1b04103ec47cec4.png
[c049ba6bf0baa25f0d17e21e9d66fae5.png]: https://img-blog.csdnimg.cn/img_convert/c049ba6bf0baa25f0d17e21e9d66fae5.png
[8d8e61f2fef6cc40f2e964e0386c96f3.png]: https://img-blog.csdnimg.cn/img_convert/8d8e61f2fef6cc40f2e964e0386c96f3.png
[bb4d28cb2b54666b82cd5b7f090571d1.png]: https://img-blog.csdnimg.cn/img_convert/bb4d28cb2b54666b82cd5b7f090571d1.png
[729a1bbfb03a9b7223bb790000733b5a.png]: https://img-blog.csdnimg.cn/img_convert/729a1bbfb03a9b7223bb790000733b5a.png
[60c523206cdf1797a67ecf8081a95e0e.png]: https://img-blog.csdnimg.cn/img_convert/60c523206cdf1797a67ecf8081a95e0e.png
[17f4284bda05da9a9e7170c6bd0caf05.png]: https://img-blog.csdnimg.cn/img_convert/17f4284bda05da9a9e7170c6bd0caf05.png
[d41a0ae083b0944e2519c594404707ad.png]: https://img-blog.csdnimg.cn/img_convert/d41a0ae083b0944e2519c594404707ad.png
[c27c8d76f3b3c1cd20391a2a76a86c37.png]: https://img-blog.csdnimg.cn/img_convert/c27c8d76f3b3c1cd20391a2a76a86c37.png
[d14d6148a5f7ba1d18e3fb6dad8a2ce2.png]: https://img-blog.csdnimg.cn/img_convert/d14d6148a5f7ba1d18e3fb6dad8a2ce2.png

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id删除数据...

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