spring_boot added mybatis

first step:

<-! Mybatis automatic starter comprises introducing jdbc jdbc so no reliance again -> 
<dependency> 
    <the groupId> org.mybatis.spring.boot </ the groupId> 
    <the artifactId> MyBatis-Spring-Boot-Starter </ the artifactId > 
    <Version> 1.3 . 2 </ Version> 
</ dependency>

 

Step 2: Perform configuration file in yml

# Configure mybatis relevant path created in the resources folder mybatis folders and 
mybatis: 
## # mapping configuration file path Mapper -locations: the CLASSPATH: mybatis / Mapper / * .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.tiangong.spring_boot_test.mapper.UserMapper">

    <select id="getUserByUsername" resultType="com.tiangong.spring_boot_10_bill.entities.User">
        <!--upper:将英文转化为大写进行校验-->
        select * from `user` where upper(username)= upper (#{username})
    </select>

    <select id="getUsers" resultType="com.tiangong.spring_boot_10_bill.entities.User">
        select * from `user` where  1=1
          <if test="username != null and username != ''">
              and username like '%${username}%'
          </if>
    </select>

</mapper>

# ## core configuration file path 
   config-location: classpath: mybatis / mybatis-config.xml

mybatis-config.xml file to see what content

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
<!--    核心配置文件-->
    <settings>
    <!--开启驼峰命名规则-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
</configuration>

 

third step:

Was added in the main scanning method mapper

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

@MapperScan("com.tiangong.spring_boot_test.mapper")
@SpringBootApplication
public class SpringBoot10BillApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBoot10BillApplication.class, args);
    }


}

Or use with @Mapper @MapperScan ( "com.tiangong.spring_boot_test.mapper ")

If the latter do not always use the annotated mapper mapper to create the position shown below