Mybatis增删改查样例 and mybatis之trim

 

Mybatis增删改查样例     

 

查询

id,code,keyword,readingNum,commentsNum,title,page,author,publishTime,lastUpdateTime,content,contentUrl,taskId,createTime


     SELECT  FROM shares_eastmoney_jmzy WHERE id=#{id}



     SELECT
          
     FROM shares_eastmoney_jmzy WHERE code=#{code} and ISNULL(content) and title is not null and loopFlag='0'  order by createTime asc



     SELECT count(1) FROM shares_eastmoney_jmzy WHERE id=#{id} and publishTime is not null

 

     SELECT * from t_recruit_info order by companyName

 

     SELECT * FROM t_company_info



     SELECT * FROM t_record_index where `type`=#{type,jdbcType=VARCHAR}

 

新增

        insert into t_company_info
        
            
                id,
            
            
                `companyName`,
            
            
                companyUnique,
            
            
                legalPerson,
            
            
                registCapital,
            
            
                establishmentTime,
            
            
                companyetAddress,
            
            
                createTime
            
        
        
            
                #{id,jdbcType=VARCHAR},
            
            
                #{companyName,jdbcType=VARCHAR},
            
            
                #{companyUnique,jdbcType=VARCHAR},
            
            
                #{legalPerson,jdbcType=VARCHAR},
            
            
                #{registCapital,jdbcType=VARCHAR},
            
            
                #{establishmentTime,jdbcType=VARCHAR},
            
            
                #{companyetAddress,jdbcType=VARCHAR},
            
            
                #{createTime,jdbcType=VARCHAR}
            
        

 

批量insert

        insert into t_bktb
        (
        id,
        companyName,
        title,
        author,
        publishTime,
        lastUpdateTime,
        content,
        articleUrl,
        createTime,
        mark
        )
        values
        
            (
            #{item.id,jdbcType=VARCHAR},
            #{item.companyName,jdbcType=VARCHAR},
            #{item.title,jdbcType=VARCHAR},
            #{item.author,jdbcType=VARCHAR},
            #{item.publishTime,jdbcType=VARCHAR},
            #{item.lastUpdateTime,jdbcType=VARCHAR},
            #{item.content,jdbcType=VARCHAR},
            #{item.articleUrl,jdbcType=VARCHAR},
            #{item.createTime,jdbcType=VARCHAR},
            #{item.mark,jdbcType=VARCHAR}
            )
        

 

oracle语句

		SELECT seq_cd_user_id.NEXTVAL FROM DUAL
		INSERT INTO CD_USER
		
			
				id,
			
			
				username,
			
			
				password,
			
			
				organization,
			
			
				policenumber,
			
			
				auditstatus,
			
			
				creattime,
			
			
				isadmin,
			
			
				usermobile,
			
			
				idcard,
			
			
				isfirst,
			
			
				usertype,
			
			
				provincecode,
			
			
				provincename,
			
			
				citycode,
			
			
				cityname,
			
			
				districtcode,
			
			
				districtname,
			
		
		VALUES
		
			
				
					#{id},
				
				
					#{userName},
				
				
					#{password},
				
				
					#{organization},
				
				
					#{policenumber},
				
				
					#{auditstatus},
				
				
					#{creattime},
				
				
					#{isadmin},
				
				
					#{usermobile},
				
				
					#{idcard},
				
				
					#{isfirst},
				
				
					#{usertype},
				
				
					#{provincecode},
				
				
					#{provincename},
				
				
					#{citycode},
				
				
					#{cityname},
				
				
					#{districtcode},
				
				
					#{districtname},
				
			
		

 

修改

  	UPDATE shares_eastmoney_jmzy
  	SET
  		publishTime=#{publishTime},
  		lastUpdateTime=#{lastUpdateTime},
  		content=#{content},
  		contentFileUrl=#{contentFileUrl}
  	WHERE id=#{id}



    UPDATE shares_eastmoney_jmzy SET loopFlag='1' WHERE id=#{id}

 

批量update

    update t_record_index
      
          companyName=#{companyName},
          companyUnique=#{companyUnique},
          companyLoopIndex=#{companyLoopIndex},
          pageLoopIndex=#{pageLoopIndex},
          `type`=#{type},
          `updateTime`=#{updateTime},
          createTime=#{createTime}
       
     where id=#{id}

 

 

 

mybatis之trim

prefix:在trim标签内sql语句加上前缀。

suffix:在trim标签内sql语句加上后缀。

suffixOverrides:指定去除多余的后缀内容，如：suffixOverrides=","，去除trim标签内sql语句多余的后缀","。

prefixOverrides:指定去除多余的前缀内容

 

  
        insert into cart  
          
              
                id,  
              
              
                user_id,  
              
              
                deal_id,  
              
              
                deal_sku_id,  
              
              
                count,  
              
              
                create_time,  
              
              
                update_time,  
              
          
          
              
                #{id,jdbcType=BIGINT},  
              
              
                #{userId,jdbcType=BIGINT},  
              
              
                #{dealId,jdbcType=BIGINT},  
              
              
                #{dealSkuId,jdbcType=BIGINT},  
              
              
                #{count,jdbcType=INTEGER},  
              
              
                #{createTime,jdbcType=TIMESTAMP},  
              
              
                #{updateTime,jdbcType=TIMESTAMP},  
              
          
      

 

假设没有指定

suffixOverrides=","  

 

执行的sql语句也许是这样的：insert into cart (id,user_id,deal_id,) values(1,2,1,);显然是错误的

指定之后语句就会变成insert into cart (id,user_id,deal_id) values(1,2,1);这样就将“，”去掉了。

前缀也是一个道理这里就不说了。