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SpringBoot 整合 Mybatis

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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<!-- mybatis 起步依赖 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>

2. 添加数据库驱动坐标

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<!-- MySQL 连接驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>

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/> <!-- lookup parent from repository -->
</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>

3. 添加数据库连接信息

application.properties 中添加数据库的连接信息:

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#DB Configuration:
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

4. 创建 user 表

在 test 数据库中创建 user 表:

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-- ----------------------------
-- Table structure for `user`
-- ----------------------------
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;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'zhangsan', '123', '张三');
INSERT INTO `user` VALUES ('2', 'lisi', '123', '李四');

表如下所示:

5. 创建实体 Bean

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package com.rk.domain;

public class User {
// 主键
private Long id;
// 用户名
private String username;
// 密码
private String password;
// 姓名
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 + '\'' +
'}';
}
}

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();
}

注意@Mapper 标记该类是一个 mybatismapper 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

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>

8. 在 application.properties 中添加 mybatis 配置信息

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#spring集成Mybatis环境
#pojo别名扫描包
mybatis.type-aliases-package=com.rk.domain
#加载Mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

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;
}
}

10. 测试结果

链接:http://localhost:8080/queryUser

结果:

--- The End    Thanks For Your Reading ---

本文标题:SpringBoot 整合 Mybatis

文章作者:RenKai

发布时间:2019年09月28日 - 14:09

最后更新:2019年11月21日 - 15:11

原始链接:http://yoursite.com/SpringBoot-Mybatis1.html

许可协议: 署名-非商业性使用-禁止演绎 4.0 国际 转载请保留原文链接及作者。

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