动态SQL语句：Mybaties SqlProvider

Posted 2021-03-01 讲文明懂礼貌

1、注解

@UpdateProvider(type = ClassName.class,method = "methodName")//更新

@InsertProvider//插入
@SelectProvider//选择
@DeleteProvider//删除

 

 

2、写法

package net.xdclass.xdvidio.provider;

/**
 * @Author Pandas
 * @Date 2020/3/31 21:03
 * @Version 1.0
 * @Descrition video构建动态sql语句
 */

import net.xdclass.xdvidio.domain.Video;
import org.apache.ibatis.jdbc.SQL;
public class VideoProvider {

    /**
     * 更新vidio的动态SQL
     * @param video
     * @return
     */
    public String updaeVideo(final Video video){
        return new SQL(){{
            UPDATE("video");

            //条件写法
            if(video.getTitle()!=null){
                SET("title=#{title}");
            }
            if(video.getSummary()!=null){
                SET("summary=#{summary}");
            }
            if(video.getCoverImg()!=null){
                SET("cover_img=#{coverImg}");
            }
            if(video.getViewNum()!=null){
                SET("view_num=#{viewNum}");
            }
            if(video.getPrice()!=null){
                SET("price=#{price}");
            }
            if(video.getOnline()!=null){
                SET("online=#{online}");
            }
            if(video.getPoint()!=null){
                SET("point=#{point}");
            } WHERE("id=#{id}");
        }}.toString();
    }
}

然后在VideoMapper里面添加：

   @UpdateProvider(type = VideoProvider.class,method = "updateVideo")
    Integer update(Video video);