mybatis关于resultMap的简单使用
CREATE TABLE today_task ( id INT PRIMARY KEY AUTO_INCREMENT COMMENT '主键', task_name VARCHAR (20) COMMENT '任务名称', task_owner VARCHAR (20) COMMENT '任务属主', task_content VARCHAR(255) COMMENT '任务内容', sex CHAR(1) COMMENT '任务性别', birth DATETIME COMMENT '任务创建时间' )
INSERT INTO today_task(task_name,task_owner,task_content,sex,birth) VALUE ('学习mybatis','admin','','男',NOW()), ('学习spring','admin','','男',NOW()), ('学习springmvc','admin','','男',NOW()), ('学习linux','admin','','男',NOW()), ('学习消息中间件','admin','','男',NOW())
<resultMap id="getTodayTaskList" type="com.java.bean.TodayTask"> <id property="taskId" column="id"/> <result property="taskName" column="task_name"/> <result property="taskOwner" column="task_owner"/> <result property="taskContent" column="task_content"/> </resultMap> <select id="getTaskList" resultMap="getTodayTaskList"> SELECT id,task_name,task_owner,task_content FROM today_task ORDER BY birth DESC </select>
id元素 ,用于设置主键字段与领域模型属性的映射关系
result元素 ,用于设置普通字段与领域模型属性的映射关系
package com.java.mapper; import com.java.bean.TodayTask; import java.util.List; public interface TodayTaskMapper { List<TodayTask> getTaskList(); }
package com.java; import com.java.bean.TodayTask; import com.java.mapper.TodayTaskMapper; import lombok.extern.slf4j.Slf4j; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import org.springframework.test.context.junit4.SpringRunner; import java.util.List; /** * @author yourheart * @Description * @create 2022-05-15 22:21 */ @RunWith(SpringRunner.class) @SpringBootTest @Slf4j public class TodayTaskTests { @Autowired private TodayTaskMapper todayTaskMapper; @Test public void test(){ List<TodayTask> taskList = todayTaskMapper.getTaskList(); taskList.forEach(a->{ log.info(a.toString()); }); } }
package com.java.bean; import lombok.Data; import java.util.Date; /** * @author yourheart * @Description * @create 2022-05-15 22:17 */ @Data public class TodayTask { /** * 主键id */ private Integer taskId; /** * 任务名称 */ private String taskName; /** * 任务属主 */ private String taskOwner; /** * 任务内容 */ private String taskContent; /** * 任务性别 */ private String sex; /** * 任务创建时间 */ private Date birth; }
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.1.RELEASE</version> <relativePath/> </parent> <groupId>com.mysql</groupId> <artifactId>mysql-service</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.49</version> </dependency> <!--lombok依赖--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.16</version> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> </project>
server.port=3307 logging.level.com.java=debug logging.level.web=debug spring.devtools.add-properties=false spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.datasource.url=jdbc:mysql://127.0.0.1:3306/yourheart-dev?useUnicode=true&characterEncoding=utf-8&useSSL=false&allowMultiQueries=true spring.datasource.username=root spring.datasource.password=root mybatis.mapper-locations=classpath:mapping/*.xml
package com.java; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; /** * @author yourheart * @Description * @create 2022-05-14 23:53 */ @SpringBootApplication @MapperScan(basePackages = "com.java.mapper") public class MysqlApplication { public static void main(String[] args) { SpringApplication.run(MysqlApplication.class, args); } }