SpringBoot之Mybatis-plus实体类注解

SpringBoot之Mybatis-plus实体类注解

1. 依赖

    <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.0.5</version>
        </dependency>

2. id主键自动填充

    @TableId(type = IdType.AUTO) // mp自带策略，主键自增
    @TableId(type = IdType.ID_WORKER) //mp自带策略，生成19位数值
    @TableId(type = IdType.ID_WORKER_STR) //mp自带策略，生成19位数值,字符串
    private Long id;

3. Date日期自动填充

    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date updateTime;

4.实现元对象处理器接口

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import java.util.Date;
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(MyMetaObjectHandler.class);

    @Override
    public void insertFill(MetaObject metaObject) {
        LOGGER.info("start insert fill ....");
        this.setFieldValByName("createTime", new Date(), metaObject);
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        LOGGER.info("start update fill ....");
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }
}