Sequence

• 官方案例

• 定义IKeyGenerator的实现

@Configuration
public class MybatisPlusConfig {

    @Bean
    public IKeyGenerator keyGenerator() {
        return new DB2KeyGenerator();
    }

}

• 配置KeySequence注解

@Data
@KeySequence("SEQ_USER")
public class User {

    @TableId(value = "id", type = IdType.INPUT)
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

• 测试

@SpringBootTest
public class SequenceTest {

    @Resource
    UserMapper userMapper;

    /**
     * INSERT INTO user ( id, name, age, email ) VALUES ( ?, ?, ?, ? )
     * 1000(Long), sequence(String), 18(Integer), test@baomidou.com(String)
     *
     * INSERT INTO user ( id, name, age, email ) VALUES ( ?, ?, ?, ? )
     * 1001(Long), sequence2(String), 19(Integer), test2@baomidou.com(String)
     */
    @Test
    public void testInsert() {
        User user = new User();
        user.setAge(18);
        user.setEmail("test@baomidou.com");
        user.setName("sequence");
        userMapper.insert(user);
        Long id1 = user.getId();
        System.out.println(id1);
        Assertions.assertTrue(id1 >= 1000, "sequence start with 1000");
        user = new User();
        user.setAge(19);
        user.setEmail("test2@baomidou.com");
        user.setName("sequence2");
        userMapper.insert(user);
        Long id2 = user.getId();
        Assertions.assertTrue(id2 - id1 == 1, "squence increment by 1");
    }

}