SpringBoot与MyBatis技术集成

一、创建project步骤

目录结构

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pom依赖

<?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>2.1.6.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.william</groupId><artifactId>day01_springboot_mybatis</artifactId><version>0.0.1-SNAPSHOT</version><name>day01_springboot_mybatis</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><!--spring MVC web开发支持--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--mybatis依赖起步坐标--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.0.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><!--数据库驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

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二、创建数据库

-- ---------------------------- -- Table structure for `user` -- ----------------------------DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT,`username` varchar(50) DEFAULT NULL, `password` varchar(50) DEFAULT NULL, `name` varchar(50) DEFAULT NULL,PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8; -- ------------------------------ Records of user ------------------------------ INSERT INTO `user` VALUES ('1', 'zhangsan', '123', '张三');INSERT INTO `user` VALUES ('2', 'lisi', '123', '李四');

三、domain层创建实体User

package com.william.domain;/*** @author ：lijunxuan* @date ：Created in 2019/6/27  20:41* @description ：* @version: 1.0*/
public class User {private Integer id;private String username;//用户名private String password;//密码private String name;//姓名@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +", name='" + name + '\'' +'}';}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}

四、添加数据库连接信息配置：在application.properties中添加数据库连接信息

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spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.url=jdbc:mysql://127.0.0.1/springboot?useUnicode=true&characterEncoding=UTF8&serverTimezone=UTC
# mapper.xml配置文件路径
mybatis.mapper-locations=classpath:mapper/*Mapper.xml
#扫描实体
mybatis.type-aliases-package=com.william.domain

五、controller层

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package com.william.Controller;import com.william.Service.UserService;
import com.william.domain.User;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;
import java.util.List;/*** @author ：lijunxuan* @date ：Created in 2019/6/27  20:43* @description ：* @version: 1.0*/
@RestController
public class UserController {@ResourceUserService userService;@RequestMapping("/findAll")public List<User>  findAll(){return userService.findAll();}}

六、service层

UserService接口

package com.william.Service;import com.william.domain.User;import java.util.List;public interface UserService {List<User> findAll();}

UserServiceImpl实现类

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package com.william.Service.Impl;import com.william.Dao.UserMapper;
import com.william.Service.UserService;
import com.william.domain.User;
import org.springframework.stereotype.Service;import javax.annotation.Resource;
import java.util.List;/*** @author ：lijunxuan* @date ：Created in 2019/6/27  20:48* @description ：* @version: 1.0*/
@Service
public class UserServiceImpl implements UserService {@ResourceUserMapper UserMapper;@Overridepublic List<User> findAll() {return UserMapper.findAll();}
}

七、DaoMapper接口层

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package com.william.Dao;import com.william.domain.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;import java.util.List;/*** @author ：lijunxuan* @date ：Created in 2019/6/27  20:42* @description ：* @version: 1.0*/
@Repository
@Mapper   // 编写Mapper：使用@Mapper标记该类是一个Mapper接口，可以被SpringBoot自动扫描
public interface UserMapper {List<User> findAll();
}

八、DaoMapper映射文件层

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.william.Dao.UserMapper"><select id="findAll" resultType="User">select * from  user</select>
</mapper>