SpringBoot 整合 Mybatis
在 idea 按步骤新建 SpringBoot 项目。
若只选择了 Web 这个起步依赖，则需要进行 第 1、2 步。若勾选了 Mybatis 依赖和 MySQL Driver 依赖，则从 第 3 步 开始。
1. 添加 Mybatis 的起步依赖
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<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
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2. 添加数据库驱动坐标
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<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
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此时的 pom.xml 文件为：
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| <?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.1.RELEASE</version>
<relativePath/>
</parent>
<groupId>com.rk</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>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</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>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
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3. 添加数据库连接信息
在 application.properties 中添加数据库的连接信息：
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spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root
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4. 创建 user 表
在 test 数据库中创建 user 表：
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DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) DEFAULT NULL,
`password` varchar(50) DEFAULT NULL,
`name` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
INSERT INTO `user` VALUES ('1', 'zhangsan', '123', '张三');
INSERT INTO `user` VALUES ('2', 'lisi', '123', '李四');
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表如下所示：
5. 创建实体 Bean
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| package com.rk.domain;
public class User {
private Long id;
private String username;
private String password;
private String name;
public Long getId() {
return id;
}
public void setId(Long 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;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", password='" + password + '\'' +
", name='" + name + '\'' +
'}';
}
}
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6. 编写 Mapper
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| package com.rk.dao;
import com.rk.domain.User;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface UserMapper {
public List<User> queryUserList();
}
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注意：@Mapper 标记该类是一个 mybatis 的 mapper 接口，可以被 spring boot 自动扫描到 spring 上下文中。
7. 配置 Mapper 映射文件
在 src\main\resources\mapper 路径下加入 UserMapper.xml 配置文件：
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| <?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.rk.dao.UserMapper">
<select id="queryUserList" resultType="com.rk.domain.User">
select * from user
</select>
</mapper>
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8. 在 application.properties 中添加 mybatis 配置信息
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mybatis.type-aliases-package=com.rk.domain
mybatis.mapper-locations=classpath:mapper/*Mapper.xml
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9. 编写测试 Controller
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| package com.rk.controller;
import com.rk.dao.UserMapper;
import com.rk.domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
public class MapperController {
@Autowired
private UserMapper userMapper;
@ResponseBody
@RequestMapping("/queryUser")
public List<User> queryUser(){
List<User> users = userMapper.queryUserList();
return users;
}
}
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10. 测试结果
链接：http://localhost:8080/queryUser
结果：
