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
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
@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;
@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;
@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
