SpringBoot整合MyBatis

1.在原有的依赖中，添加MyBatis的依赖

<!--SpringBoot整合MyBatis-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.1.1</version>
</dependency>

2.配置相关数据源信息(application.yml)。

#DataBase Configuration
spring:
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/springbootdemo?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT
    username: root
    password: 123
#SpringDataJPA Configuration
  jpa:
    database: mysql
    show-sql: true
    generate-ddl: true

3.创建实体类，对应数据库表中的字段，并添加getter、setter和toString方法

4.创建mapper接口和对应的sql映射文件，二者在同一个包下。

MyUserMapper ：

package com.gxh.mapper;

import com.gxh.entity.MyUser;

import java.util.List;

public interface MyUserMapper {
    List<MyUser> getUserList();
}

MyUserMapper .xml：

<?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.gxh.mapper.MyUserMapper">
    <select id="getUserList" resultType="com.gxh.entity.MyUser">
        select * from user
    </select>
</mapper>

5.在SpringBoot启动类上添加@MapperScan注解

 6.运行，会报500错误，

解决办法：

　　方法1：将mapper.xml建在resources目录下，和mapper类在同一目录结构下。

　　方法2：在pom.xml中添加下面代码

<build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.*</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

再次运行，会发现，可以出现数据了