本章內容基於SpringBoot入門：https://www.cnblogs.com/forelim/p/15379580.html

SpringBoot整合Mybatis

1. 匯入依賴

   <!-- mysql -->
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>8.0.26</version>
   </dependency>
   <!-- mybatis啟動器 -->
   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>2.1.3</version>
   </dependency>
   <!-- 測試 -->
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-test</artifactId>
   </dependency>
   <!-- 分頁外掛 -->
   <dependency>
       <groupId>com.github.pagehelper</groupId>
       <artifactId>pagehelper-spring-boot-starter</artifactId>
       <version>1.3.0</version>
   </dependency>
    
   

2. 載入配置 application.yml

   # 埠號
   server:
     port: 8080
   
   # 資料來源
   spring:
     datasource:
       # 驅動
       driver-class-name: com.mysql.cj.jdbc.Driver
       # 路徑
       url: jdbc:mysql://localhost:3306/demo?useSSL=false&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
       # 使用者名稱
       username: root
       # 密碼
       password: mysql
   
   # mybatis配置
   mybatis:
     configuration:
       # 日誌
       log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
       # 下劃線轉駝峰
       map-underscore-to-camel-case: true
     # 別名包
     type-aliases-package: com.demo.entity
     # 對映檔案位置
     mapper-locations: classpath:mapper/*.xml
   
   # 分頁外掛
   pagehelper:
     # 資料庫
     helper-dialect: mysql
     # 合理化
     reasonable: true
     # 支援通過方法傳遞引數
     support-methods-arguments: true
     # 引數
     params: count==countSql
     # 傳入0時顯示全部資料
     page-size-zero: true
    
   

3. Entity & Mapper

   public class Demo {
       private Integer id;
       private String name;
       private Integer age;
   
       public Integer getId() {
           return id;
       }
   
       public void setId(Integer id) {
           this.id = id;
       }
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       public Integer getAge() {
           return age;
       }
   
       public void setAge(Integer age) {
           this.age = age;
       }
   
   }
    
   

   import com.demo.entity.Demo;
   import org.apache.ibatis.annotations.Mapper;
   
   import java.util.List;
   
   @Mapper
   // 如果mapper介面過多 可以在主啟動類上加上@MapperScanner("mapper介面包") 代替 @Mapper註解
   public interface DemoMapper {
       /**
        * 查詢全部
        * @return 列表
        */
       List<Demo> list();
   }
   

   <?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.demo.mapper.DemoMapper">
       <select id="list" resultType="demo">
           select id, name, age
           from t_demo
       </select>
   </mapper>
   

4. 測試類

   import com.demo.entity.Demo;
   import com.github.pagehelper.PageHelper;
   import com.github.pagehelper.PageInfo;
   import org.junit.jupiter.api.Test;
   import org.springframework.beans.factory.annotation.Autowired;
   import org.springframework.boot.test.context.SpringBootTest;
   
   import java.util.List;
   
   @SpringBootTest
   public class DemoMapperTest {
   
       /**
        * 自動織入mapper介面
        */
       @Autowired
       private DemoMapper demoMapper;
       @Test
       void list() {
           // 分頁
           PageHelper.startPage(1,2);
           // 呼叫
           List<Demo> list = demoMapper.list();
           // 封裝分頁物件
           PageInfo<Demo> demoPageInfo = new PageInfo<>(list);
       }
   }
   

5. 成功!