SpringBoot整合Mybatis完整详细版（快速整合）

1.上来先撸个数据库（这样简单就可以了）

直接给你们写好复制吧

/*
 Navicat MySQL Data Transfer

 Source Server         : 新连接
 Source Server Type    : MySQL
 Source Server Version : 50515
 Source Host           : localhost:3306
 Source Schema         : mybatis

 Target Server Type    : MySQL
 Target Server Version : 50515
 File Encoding         : 65001

 Date: 05/07/2020 17:17:05
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(255) NULL DEFAULT NULL,
  `name` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `pwd` varchar(30) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, '王强', '123');
INSERT INTO `user` VALUES (5, '啊猫', '456789');
INSERT INTO `user` VALUES (5, '啊猫', '456789');
INSERT INTO `user` VALUES (6, 'xyj', '66666');

SET FOREIGN_KEY_CHECKS = 1;

2.整体结构

3.（1）导入pom.xml依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.xyj</groupId>
    <artifactId>springboot-mybatis</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-mybatis</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.0.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

3.（2）application.properties与数据库连接

spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#整合mybatis
mybatis.type-aliases-package=com.xyj.pojo
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

4.构建实体类User

package com.xyj.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author xyj
 * @date 2020/7/5 -16:30
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private int id;
    private String name;
    private String pwd;
}

5.UserMapper接口(增删改查)

package com.xyj.mapper;

import com.xyj.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @author xyj
 * @date 2020/7/5 -16:32
 */
@Mapper
@Repository
public interface UserMapper {

    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);
}

6.UserMapper.xml编写（与UserMapper一一对应）

<?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="com.xyj.mapper.UserMapper">

    <select id="queryUserList" resultType="User">
        select * from  user
    </select>

    <select id="queryUserById" resultType="User">
        select * from user where id =#{id}

    </select>

    <insert id="addUser" parameterType="User">
        insert into user (id, name, pwd) values (#{id}, #{name}, #{pwd});
    </insert>

    <update id="updateUser" parameterType="User">
        update user set name=#{name}, pwd=#{pwd} where id =#{id};
    </update>

    <delete id="deleteUser" parameterType="int">
        delete from user where id=#{id};
    </delete>
</mapper>

7.增删改查UserController

package com.xyj.controller;

import com.xyj.mapper.UserMapper;
import com.xyj.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * @author xyj
 * @date 2020/7/5 -16:54
 */
@RestController
public class UserController {
    @Autowired
    private UserMapper userMapper;
    //查
    @GetMapping("/queryUserList")
    public List<User> queryUserList(){
        List<User> userList = userMapper.queryUserList();
        return userList;
    }
    //增
    @GetMapping("/addUser")
    public String addUser(){
        userMapper.addUser(new User(6,"xyj","66666"));
        return "addUser";
    }
    //改
    @GetMapping("/updateUser")
    public String updateUser(){
        userMapper.updateUser(new User(888,"xyj222","777"));
        return "updateUser";
    }
    //删
    @GetMapping("/deleteUser")
    public String deleteUser(){
        userMapper.deleteUser(3);
        return "deleteUser";
    }
}

8.分别在网页里，写出相应的@GetMapping里的单词 即可实现每个操作，与数据库比对

9.这样，我们简单的增删改查就完成了