12-SpringBoot整合mybatis
SpringBoot整合mybatis
实现步骤
①搭建SpringBoot工程
②引入mybatis起步依赖，添加mysql驱动
③编写DataSource和MyBatis相关配置
④定义表和实体类
⑤编写dao和mapper文件/纯注解开发
实现案例
1. 搭建SpringBoot工程
创建一个maven的空项目：
2. 引入mybatis起步依赖，添加mysql驱动
配置 pom.xml 设置依赖：
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>springboot-mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<!--springboot工程需要继承的父工程-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.8.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.2</version>
</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>
</dependency>
</dependencies>
</project>3. 定义数据库表
create database springboot charset=utf8;
CREATE TABLE `t_user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(100) DEFAULT NULL,
`password` varchar(100) DEFAULT NULL,
PRIMARY KEY (`id`)
);
-- 插入数据
insert into t_user VALUES(null, "李白", "123456");
insert into t_user VALUES(null, "任我肥", "123456");
insert into t_user VALUES(null, "刘德肉", "123456");
-- 查询数据
select * from t_user;4.编写SpringBoot 启动引导类
package com.lijw.springbootmybatis;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SpringbootMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisApplication.class, args);
}
}5. 编写实体类
package com.lijw.springbootmybatis.domain;
public class User {
private int id;
private String username;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
'}';
}
}5. 编写数据库连接配置以及mybatis配置
application.yml
# datasource
spring:
datasource:
url: jdbc:mysql:///springboot?serverTimezone=UTC
username: root
password: Lijw**************
driver-class-name: com.mysql.cj.jdbc.Driver
# mybatis
mybatis:
mapper-locations: classpath:mapper/*Mapper.xml # mapper映射文件路径
type-aliases-package: com.lijw.springbootmybatis.domain
# config-location: # 指定mybatis的核心配置文件“
mybatis的部分用于XML的映射文件设置，不过也一起配置上，不然会有警告信息。
mybatis.config-location 用于配置 mybatis 的核心配置文件，目前没用到。
”
6. 纯注解开发，编写UserMapper
package com.lijw.springbootmybatis.mapper;
import com.lijw.springbootmybatis.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;
import java.util.List;
@Mapper
@Repository
public interface UserMapper {
@Select("select * from t_user")
public List<User> findAll();
}7.编写测试方法类，验证全注解的查询
package com.lijw.springbootmybatis.mapper;
import com.lijw.springbootmybatis.SpringbootMybatisApplication;
import com.lijw.springbootmybatis.domain.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootMybatisApplication.class)
public class UserMapperTest {
@Autowired
UserMapper userMapper;
@Test
public void findAll() {
List<User> all = userMapper.findAll();
System.out.println(all);
}
}执行查询测试如下：
8.XML数据查询开发
8.1 编写dao UserXmlMapper
package com.lijw.springbootmybatis.mapper;
import com.lijw.springbootmybatis.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;
@Mapper
@Repository
public interface UserXmlMapper {
public List<User> findAll();
}8.2 编写 mapper.xml
<?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.lijw.springbootmybatis.mapper.UserXmlMapper">
<select id="findAll" resultType="user">
select * from t_user
</select>
</mapper>9.编写测试代码
package com.lijw.springbootmybatis.mapper;
import com.lijw.springbootmybatis.SpringbootMybatisApplication;
import com.lijw.springbootmybatis.domain.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootMybatisApplication.class)
public class UserMapperTest {
@Autowired
UserMapper userMapper;
@Autowired
UserXmlMapper userXmlMapper;
@Test
public void findAll() {
List<User> all = userMapper.findAll();
System.out.println(all);
}
@Test
public void findAll2() {
List<User> all = userXmlMapper.findAll();
System.out.println(all);
}
}
