SpringBoot：第二篇 集成mybatis

1.添加依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.0.0</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

2.sql

CREATE TABLE `t_student` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主建',
  `name` varchar(200) DEFAULT NULL COMMENT '姓名',
  `create_time` datetime DEFAULT NULL COMMENT '时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT '学生表';

3.application.properties

mybatis.mapper-locations=classpath:mappers/*.xml
mybatis.type-aliases-package=com.example.demo.model
spring.datasource.url = jdbc:mysql://db4free.net:3306/dbs_xq
spring.datasource.username = root_xq
spring.datasource.password = root123456
spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver

4.类

(1)dao

package com.example.demo.dao;


import com.example.demo.model.StudentEbo;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import java.util.List;

/**
 * Package: com.vince.dao
 * User: 诸葛子房
 * Email: xiaoiqu2017wy@163.com
 * Date: 2019/3/21
 * Time: 11:36
 * Description:
 */
@Mapper
public interface StudentDao {

    @Select("select id,name,create_time as createTime from t_student")
    List<StudentEbo> findAll();

    List<StudentEbo> listStu(@Param("name") String name);

    StudentEbo getStuById(@Param("id") int id);

    void addStu(StudentEbo stu);

    void insertByBatch(List<StudentEbo> studentEbos);

    @Delete("delete from t_student")
    void delete();

}

(2)model

package com.example.demo.model;

import com.fasterxml.jackson.annotation.JsonFormat;

import java.util.Date;

/**
 * Package: com.vince.model
 * User: 诸葛子房
 * Email: xiaoiqu2017wy@163.com
 * Date: 2019/3/21
 * Time: 11:35
 * Description:
 */
public class StudentEbo {

    private int id;
    private String name;

    @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
    private Date createTime;

    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 Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
}

(3)启动类----@MapperScan("com.example.demo.dao")

package com.example.demo;

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

@MapperScan("com.example.demo.dao")
@SpringBootApplication
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

(4)mapper 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.example.demo.dao.StudentDao">

    <resultMap type="com.example.demo.model.StudentEbo" id="StudentMap">
        <result property="id" column="id" jdbcType="INTEGER" javaType="Integer"/>
        <result property="name" column="name" jdbcType="VARCHAR" javaType="String"/>
        <result property="createTime" column="create_time" jdbcType="TIMESTAMP" javaType="java.util.Date"/>
    </resultMap>

    <sql id="studentEboMap">
        SELECT
        s.id,s.name,s.create_time
        FROM
        t_student AS s
    </sql>

    <select id="getStuById"
            resultMap="StudentMap">
        SELECT
        s.id,s.name,s.create_time
        FROM
        t_student AS s where id=#{id}
    </select>

    <select id="listStu" resultMap="StudentMap">
        <include refid="studentEboMap"/>
        <where>
            1=1
            <if test=" name != null and name != '' ">
                AND s.name LIKE '%${name}%'
            </if>
        </where>
    </select>


    <insert id="insertByBatch">
        INSERT INTO t_student
        (id, name, create_time)
        VALUES
        <foreach collection ="list" item="user" separator =",">
            (#{user.id}, #{user.name}, #{user.createTime})
        </foreach >
    </insert>


</mapper>

5.使用

package com.example.demo.controller;

/**
 * @author xiaoqiu
 * @Date 2019-06-14 15:05
 **/

import com.example.demo.dao.StudentDao;
import lombok.extern.slf4j.Slf4j;
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;

@Slf4j
@Controller
@RequestMapping("/")
public class TestController {

    @Autowired
    private StudentDao studentDao;

    @RequestMapping("/")
    @ResponseBody
    public String index() {
        log.info("++++");
        return studentDao.getStuById(1).getName() + "hello world";
    }

}