1. 資料庫準備

a.建立資料庫

CREATE DATABASE test_logistics;

b.建立表

create table wh_user (
    userId int auto_increment primary key comment '使用者Id',
    userCode varchar(20) unique key comment '使用者編碼',
    userName varchar(20) comment '使用者名稱稱'
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 comment '使用者表'
 
;

c.錄入資料

INSERT INTO `wh_user` (`userCode`, `userName`) VALUES(uuid(),'張三') ;
INSERT INTO `wh_user` (`userCode`, `userName`) VALUES(uuid(),'李四') ;
INSERT INTO `wh_user` (`userCode`, `userName`) VALUES(uuid(),'王五') ;

2.專案程式碼

a. 專案目錄

b.配置pom.xml

引入mybatis依賴

<!-- mybatis -->
<dependency
 
>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.0</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId
 
>
</dependency>

c.配置application.properties

#資料庫配置
spring.datasource.url=jdbc:mysql://192.168.0.95:3306/test_logistics?             useUnicode=true&characterEncoding=utf8         
spring.datasource.username=root
spring.datasource.password=bjbshwlff
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

#mybatis配置
mybatis.typeAliasesPackage=test.entity   

#埠配置
server.port=8085

d.建立WhUser實體物件

package test.entity;

public class WhUser {

    private Integer userId;

    private String userCode;

    private String userName;

    public Integer getUserId() {
        return userId;
    }

    public WhUser() {
        super();
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public String getUserCode() {
        return userCode;
    }

    public void setUserCode(String userCode) {
        this.userCode = userCode;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }


}

e.建立WhUserDao介面

package test.dao;

import org.apache.ibatis.annotations.Select;

import test.entity.WhUser;

public interface WhUserDao {
    @Select("SELECT * FROM wh_user WHERE userId = #{userId}")
    WhUser getUserInfo(WhUser user);
}

f.控制層和service層程式碼

testController.java程式碼

@RequestMapping("/testUserInfo.show")
    public String testUserInfo(){
        WhUser user = new WhUser();
        user.setUserId(1);
        user = testService.getUserInfo(user);
        return user.getUserName();
    }

testService.java程式碼

package test.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import test.dao.WhUserDao;
import test.entity.WhUser;

@Service
@Transactional(rollbackFor = Exception.class)
public class testService {

    @Resource
    private WhUserDao whUserDao;

    public WhUser getUserInfo(WhUser user){
        return whUserDao.getUserInfo(user); 
    }

}

g.配置Application.java

通過@MapperScan註解進行dao檔案的掃描

@SpringBootApplication  //工程啟動自動掃描的基礎註解
@MapperScan("test.dao")//掃描dao層程式碼
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

3. 執行專案
a.在啟動檔案Application.java中，右擊–> Run As –> java Application，啟動專案

b.開啟瀏覽器，輸入地址，檢視返回資料，如下圖