springboot整合mybatis

1.pom文件添加依赖

　　　　　<!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.0</version>
        </dependency>

2.在application.yml中配置数据库连接信息

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=UTF-8
    type: com.zaxxer.hikari.HikariDataSource
    username: root
    password: 123456

mybatis:
  mapper-locations: classpath:mapper/*mapper.xml   #读取mapper配置
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl  #打印sql语句
logging:
  level:
    root: DEBUG    #配置日志级别
    org.springframework: DEBUG
    org.mybatis: DEBUG

3.启动类添加注解,指定接口扫描类

@MapperScan("com.zp.demozp.dao")

package com.zp.demozp;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Repository;

//指定mybatis接口扫描类
//@MapperScan(basePackages = "com.zp.demozp.dao",annotationClass = Repository.class)
@MapperScan("com.zp.demozp.dao")
@SpringBootApplication
public class DemozpApplication {

    public static void main(String[] args) {
        System.out.println("hello world!");
        SpringApplication.run(DemozpApplication.class, args);
    }

}

4.代码编写

目录结构

controller代码:

package com.zp.demozp.controller;

import com.zp.demozp.domain.UserDomain;
import com.zp.demozp.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.*;


@RestController
@EnableAutoConfiguration
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    /**
     * 根据id获取信息
     * @param id
     * @return
     */
    @RequestMapping(value = "/getUserById",method = RequestMethod.GET)
    public String getUserById(@RequestParam int id){
        return userService.getUserById(id);
    }

    /**
     * 添加用户
     * @param userDomain
     * @return
     */
    @RequestMapping(value = "/add",method = RequestMethod.POST)
    public int addUser(@RequestBody UserDomain userDomain){
        return userService.addUser(userDomain);
    }
}

service代码:

package com.zp.demozp.service;

import com.zp.demozp.domain.UserDomain;


public interface UserService{
    public String getUserById(int id);

    public int addUser(UserDomain userDomain);
}

serviceImpl代码:

package com.zp.demozp.service.impl;

import com.zp.demozp.dao.UserDao;
import com.zp.demozp.domain.UserDomain;
import com.zp.demozp.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;

    /**
     *
     * @param id
     * @return
     */
    @Override
    public String getUserById(int id) {
        UserDomain user = userDao.getUserById(id);
        return user.getName();
    }

    @Override
    public int addUser(UserDomain userDomain) {

        return userDao.insertUser(userDomain);
    }
}

domain代码:

package com.zp.demozp.domain;


public class UserDomain {
    private int id;  //id
    private  String name;  //姓名
    private int age;       //年龄

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

dao代码:

package com.zp.demozp.dao;

import com.zp.demozp.domain.UserDomain;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
//使用maper和repisitory都可以
//@Repository
@Mapper
public interface UserDao {
  /**
   * 添加一条用户信息
   * @param userDomain
   * @return
   */
  public int insertUser(UserDomain userDomain);

  /**
   * 根据id获取用户信息
   * @param id
   * @return
   */
  public  UserDomain getUserById(int id);

}

mappwer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.zp.demozp.dao.UserDao">
    <!--根据id获取用户信息-->
    <select id="getUserById" resultType="com.zp.demozp.domain.UserDomain">
        select * from users where id = #{id}
    </select>
    <!--添加一条用户信息-->
    <insert id="insertUser">
        insert into users(name,age) values(#{name},#{age})
    </insert>
</mapper>

 5.测试
  添加:

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