【女朋友都懂的】spring boot 整合 mybatis-plus

簡介

mybatis-plus

MyBatis-Plus（簡稱 MP）是一個 MyBatis 的增強工具，在 MyBatis 的基礎上只做增強不做改變，爲簡化開發、提高效率而生。現最新版本爲 3.3.0

添加依賴 pom.xml

• 引入 Spring Boot Starter 父工程：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.6.RELEASE</version>
    <relativePath/>
</dependency>

• 引入 spring-boot-starter、spring-boot-starter-test、mybatis-plus-boot-starter、lombok、mysql 依賴：

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.3.0</version>
    </dependency>
    <!-- MySQL -->
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
	</dependency>
</dependencies>
		

配置

1. application.yml 或 application.properties 配置文件中添加 mysql數據庫的相關配置：

spring: 
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/8timer_test?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&allowMultiQueries=true&zeroDateTimeBehavior=CONVERT_TO_NULL
    driver-class-name: com.mysql.cj.jdbc.Driver

2. Spring Boot 啓動類中添加 @MapperScan 註解：

/* @MapperScan
 * 作用：指定要變成實現類的接口所在的包，然後包下面的所有接口在編譯之後都會生成相應的實現類
 * 添加位置：是在Springboot啓動類上面添加，
 */
@MapperScan("cn.timer.api.dao") // 掃描的mapper
@SpringBootApplication
public class Application {
	public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

代碼

創建實體類

People

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class People {
    private Integer id;
    private String name;
    private Integer age;
    private String hobby;
    private String motto;
}

創建Mapper類

public interface PeopleMapper extends BaseMapper<People> {

}

調試

@RunWith(SpringRunner.class)
@SpringBootTest
public class SampleTest {

    @Autowired
    private PeopleMapper peopleMapper;

	//查詢
    @Test
    public void selectList() {
        System.out.println(("selectList start"));
        // peopleMapper.selectList(queryWrapper); 
        // queryWrapper 是 MP 提供的 實體對象封裝操作類，爲 null 則無條件查詢
        List<People> peopleList = peopleMapper.selectList(null);
        Assert.assertEquals(6, userList.size());
        for (People people : peopleList) {
			System.out.println(people);
		}
    }

}

控制檯

selectList start
People(id=1001, name=Cxk, age=18, hobby=打籃球, motto=雞你太美1)
People(id=1002, name=Cxk, age=18, hobby=嘻哈, motto=雞你太美2)
People(id=1003, name=Cxk, age=18, hobby=唱, motto=雞你太美3)
People(id=1004, name=Cxk, age=18, hobby=跳, motto=雞你太美4)
People(id=1005, name=Cxk, age=18, hobby=rap, motto=雞你太美5)
People(id=1006, name=Cxk, age=18, hobby=雞, motto=雞你太美6)

CRUD

新增

People p1 = People.builder().name("Cxk").age(18).hobby("打籃球").motto("雞你太美1").build();
peopleMapper.insert(p1);

刪除

peopleMapper.deleteById(id)

查詢

People p3 = peopleMapper.selectById(id)

修改

People p4 = People.builder().id(1).hobby("唱").motto("ccccc").build();
peopleMapper.updateById(p4);

更多API請看官網： Mybatis Plus

總結

• 整合簡易
• 不需要寫 SQL和 XML 就可以實現簡單的 CRUD 功能
• 快速開發項目

補充

• 【三分鐘學會】spring boot 整合swagger2(knife4j-UI升級版)
• eclipse-lombok插件

感謝

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