springboot集成mybatis

1. 新建Springboot项目,可以参考上一章.

spring-boot-starter-parent 的版本选2.0.1.RELEASE

2. 添加Mybatis的起步依赖和据库驱动坐标

<!--mybatis起步依赖-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.1.1</version>
</dependency>

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

3. 添加数据库连接信息

在application.properties中添加数据量的连接信息

#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=123456

4. 创建user表

在test数据库中创建user表

-- ----------------------------
-- 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');

5. 创建实体Bean

新建 com.sui.domain.User (包括get set tostrng)

public class User {
    private Integer id;
    private String username;
    private String password;
    private String name;
}

6. 编写Mapper

com.sui.mapper.UserMapper

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

package com.sui.mapper;

import com.sui.domain.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapper {
    public List<User> queryUserList();
}

7. 配置Mapper映射文件

在src\main\resources\mapper路径下加入UserMapper.xml配置文件"

<?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.sui.mapper.UserMapper">
    <select id="queryUserList" resultType="user">
select * from user
</select>
</mapper>

8. 在application.properties中添加mybatis的信息

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

9. 编写测试controller

com.sui.controller.MybatisController

package com.sui.controller;

import com.sui.domain.User;
import com.sui.mapper.UserMapper;
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 MybatisController {

    @Autowired
    private UserMapper userMapper;

    @RequestMapping("/query")
    @ResponseBody
    public List<User> queryList(){
        List<User> users = userMapper.queryUserList();
        return users;
    }
}