SpringBoot整合Mybatis(使用配置文件方式)

1.首先看下一下maven的依赖，主要是mybatis依赖，mysql驱动，以及之后测试使用的依赖spring-boot-test

        
		
			org.mybatis.spring.boot
			mybatis-spring-boot-starter
			1.3.2
		
		
		
			mysql
			mysql-connector-java
		
		
			org.junit.jupiter
			junit-jupiter-api
		
		
			org.springframework
			spring-test
			5.1.2.RELEASE
			compile
		
		
			junit
			junit
			4.12
		
		
			org.springframework.boot
			spring-boot-test
		

2.其次在application.properties文件中配置mybatis的mapper文件位置，和实体类的包路径，还有最好加上驼峰命名规范

####mybatis配置
# 注意注意
mybatis.mapper-locations=classpath:edu/hohai/chapter1/gt/mapper/*.xml
#mybatis.mapper-locations=classpath:mapper/*.xml   #这种方式需要自己在resources目录下创建mapper目录然后存放xml
mybatis.type-aliases-package=edu.hohai.chapter1.gt.entity
# 驼峰命名规范 如：数据库字段是  order_id 那么 实体字段就要写成 orderId
mybatis.configuration.map-underscore-to-camel-case=true

看下项目结构：这里我把Mapper类和Mapper映射文件放在了一起，这时候我们还需要做下面设置，让springboot能在java包中扫描xml文件（springboot默认扫描的是包中的*.java文件），如果使用resources目录下面的xml，这打开上面的

mybatis.mapper-locations=classpath:mapper/*.xml

项目结构图

3.设置springboot在包中扫描xml文件

		
			
				org.springframework.boot
				spring-boot-maven-plugin
				
					true
				
			
		

		
		
			
				src/main/resources
			
			
				src/main/java
				
					**/*.xml
				
				true
			
		

4.UserMapper.java  UserMapper.xml

package edu.hohai.chapter1.gt.mapper;

import edu.hohai.chapter1.gt.entity.User;
import org.apache.ibatis.annotations.Mapper;

/**
 * @author cronous
 * @create 2018-11-01 15:04
 */
@Mapper //注意这里的Mapper注解
public interface UserMapper {

    int insert(User user);
}

    
    INSERT INTO `t_user`(`username`,`password`) VALUES (#{username},#{password})
  

5.数据库表

CREATE TABLE `t_user` (
  `id` int(8) NOT NULL AUTO_INCREMENT COMMENT '主键自增',
  `username` varchar(50) NOT NULL COMMENT '用户名',
  `password` varchar(50) NOT NULL COMMENT '密码',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 COMMENT='用户表';

6.测试

package edu.hohai.chapter1;

import edu.hohai.chapter1.gt.entity.User;
import edu.hohai.chapter1.gt.mapper.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


/**
 * @author cronous
 * @create 2018-11-01 15:20
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class ChapterTest {

    private static final Logger log = LoggerFactory.getLogger(ChapterTest.class);

    @Autowired
    private UserMapper userMapper;

    @Test
    public void test1() throws Exception {


        final int row1 = userMapper.insert(new User("u1", "p1"));
        log.info("[添加结果] - [{}]", row1);
        final int row2 = userMapper.insert(new User("u2", "p2"));
        log.info("[添加结果] - [{}]", row2);
        final int row3 = userMapper.insert(new User("u1", "p3"));
        log.info("[添加结果] - [{}]", row3);


    }
}

7.查看数据库

发现已经写入数据库，测试完成