MyBatis-Plus

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MyBatis-Plus

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user`
(
    id BIGINT NOT NULL COMMENT '主键ID',
    name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
    age INT NULL DEFAULT NULL COMMENT '年龄',
    email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱',
    PRIMARY KEY (id)
);

Spring Boot2
Maven
Gradle
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.9</version>
</dependency>

Spring Boot3
Maven
Gradle
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
    <version>3.5.9</version>
</dependency>

配置
在 application.yml 配置文件中添加 H2 数据库的相关配置：

application.yml
# DataSource Config
spring:
  datasource:
    driver-class-name: org.h2.Driver
    username: root
    password: test
  sql:
    init:
      schema-locations: classpath:db/schema-h2.sql
      data-locations: classpath:db/data-h2.sql

上面的配置是任何一个 Spring Boot 工程都会配置的数据库链接信息，如果您使用的是其他数据库，如 MySQL，则需要修改相应的配置信息。

在 Spring Boot 启动类中添加 @MapperScan 注解，扫描 Mapper 文件夹：

Application.java
@SpringBootApplication
@MapperScan("com.baomidou.mybatisplus.samples.quickstart.mapper")
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

编码
编写实体类 User.java：

User.java
@Data
@TableName("`user`")
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

编写 Mapper 接口类 UserMapper.java：

public interface UserMapper extends BaseMapper<User> {

}

@SpringBootTest
public class SampleTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void testSelect() {
        System.out.println(("----- selectAll method test ------"));
        List<User> userList = userMapper.selectList(null);
        Assert.isTrue(5 == userList.size(), "");
        userList.forEach(System.out::println);
    }

}