SpringBoot3整合MyBatis
一、MyBatis整合步骤:
(1).导入依赖:在Spring Boot项目的构建文件(如pom.xml)中添加MyBatis和数据库驱动的相关依赖。例如，如果使用MySQL数据库，您需要添加MyBatis和MySQL驱动的依赖。
(2).配置数据源:在application.properties或application.yml中配置数据库连接信息，包括数据库URL、用户名、密码、mybatis的功能配置等。
(3).创建实体类:创建与数据库表对应的实体类。
(4).创建Mapper接口:创建与数据库表交互的Mapper接口。
(5).创建Mapper接口SQL实现:可以使用mapperxml文件或者注解方式
(6).创建程序启动类
(7).注解扫描:在Spring Boot的主应用类上添加@MapperScan注解，用于扫描和注册Mapper接口。
(8).使用Mapper接口:在需要使用数据库操作的地方，通过依赖注入或直接实例化Mapper接口，并调用其中的方法进行数据库操作。
二、MyBatis整合实践:
1.创建项目
2.导入依赖:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.5</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>3.0.1</version>
</dependency>
<!-- 数据库相关配置启动器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- druid启动器的依赖 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-3-starter</artifactId>
<version>1.2.18</version>
</dependency>
<!-- 驱动类-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.28</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.28</version>
</dependency>
</dependencies>3.配置文件:
server:
port: 80
servlet:
context-path: /
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
druid:
url: jdbc:mysql:///day01
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
configuration: # setting配置
auto-mapping-behavior: full
map-underscore-to-camel-case: true
log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpl
type-aliases-package: com.atguigu.pojo # 配置别名
mapper-locations: classpath:/mapper/*.xml # mapperxml位置4.实体类准备:
package com.atguigu.pojo;
public class User {
private String account ;
private String password ;
private Integer id ;
public String getAccount() {
return account;
}
public void setAccount(String account) {
this.account = account;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
@Override
public String toString() {
return "User{" +
"account='" + account + '\'' +
", password='" + password + '\'' +
", id=" + id +
'}';
}
}5.Mapper接口准备:
public interface UserMapper {
List<User> queryAll();
}6.Mapper接口实现(XML)
位置:resources/mapper/UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- namespace = 接口的全限定符 -->
<mapper namespace="com.atguigu.mapper.UserMapper">
<select id="queryAll" resultType="user">
select * from users
</select>
</mapper>7.编写三层架构代码:
controller:
@Slf4j
@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@GetMapping("/list")
@ResponseBody
public List<User> getUser(){
List<User> userList = userService.findList();
log.info("查询的user数据为:{}",userList);
return userList;
}
}service:
@Slf4j
@Service
public class UserService {
@Autowired
private UserMapper userMapper;
public List<User> findList(){
List<User> users = userMapper.queryAll();
log.info("查询全部数据:{}",users);
return users;
}
}8.启动类和接口扫描:
@MapperScan("com.atguigu.mapper") //mapper接口扫描配置
@SpringBootApplication
public class MainApplication {
public static void main(String[] args) {
SpringApplication.run(MainApplication.class,args);
}
}
9.启动测试
原文地址：https://blog.csdn.net/m0_50460160/article/details/144358735
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