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mysql存儲(chǔ)過(guò)程如何利用臨時(shí)表返回結(jié)果集

更新時(shí)間：2022年09月26日 09:58:47 作者：你好龍卷風(fēng)?。。?

這篇文章主要介紹了mysql存儲(chǔ)過(guò)程如何利用臨時(shí)表返回結(jié)果集，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

首先要聲明的是

1，游標(biāo)的方法會(huì)很慢在mysql中，在oracle數(shù)據(jù)庫(kù)中還可以，除非沒(méi)有別的方法，一般不建議在mysql中使用游標(biāo)，

2，不建議在mysql中拼接sql，會(huì)使存儲(chǔ)過(guò)程顯得很臃腫，可以使用or來(lái)動(dòng)態(tài)判別傳入的參數(shù)是否為空

and ?( TTB.office_id=輸入?yún)?shù) or ?輸入?yún)?shù) is null ?or 輸入?yún)?shù) = '')
and ?( TTB.office_id=IN_Office_id or ?IN_Office_id is null ?or IN_Office_id = '')

3，不建議使用臨時(shí)表來(lái)存儲(chǔ)多用戶下經(jīng)常查詢的內(nèi)容，比如報(bào)表

4，返回結(jié)果集更好的方法是直接鏈接多個(gè)表返回結(jié)果集即可，下面的示例雖然給以得到正確結(jié)果，

但代碼臃腫，速度異常的慢，可以當(dāng)個(gè)反面教材

5，優(yōu)化后的存儲(chǔ)過(guò)程：http://www.dbjr.com.cn/article/263729.htm

測(cè)試示例

BEGIN
		#創(chuàng)建一個(gè)臨時(shí)表
        DROP TABLE if  exists user_temporary;
		create temporary table if not exists user_temporary
		(
				id	VARCHAR(64) primary key,#id
				user_name VARCHAR(20) #姓名
					 
				) ;
         begin
                   
                   
           #定義 變量  接收id和姓名
           declare a VARCHAR(64);  
           declare b VARCHAR(20);
 
             
           #這個(gè)用于處理游標(biāo)到達(dá)最后一行的情況  
  
           DECLARE s int default 0;  
             
           #聲明游標(biāo)cursor_name（cursor_name是個(gè)多行結(jié)果集）  
  
           DECLARE cursor_name CURSOR FOR select id ,name     from user ;  
             
           #設(shè)置一個(gè)終止標(biāo)記   
    
           DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET s=1;  
            
                #打開(kāi)游標(biāo)  
  
                OPEN cursor_name;  
                      
                    #獲取游標(biāo)當(dāng)前指針的記錄，讀取一行數(shù)據(jù)并傳給變量a,b  
  
                    fetch  cursor_name into a,b;  
                    #開(kāi)始循環(huán)，判斷是否游標(biāo)已經(jīng)到達(dá)了最后作為循環(huán)條件   
  
                    while s <> 1 do  
                            
                            insert into user_temporary(id,user_name) values(a,b);  
                            #讀取下一行的數(shù)據(jù)  
  
                            fetch  cursor_name into a,b;  
                      
                    end while;  
                   
                 #關(guān)閉游標(biāo)  
  
                 CLOSE cursor_name ;  
              
         #從臨時(shí)表中拿到結(jié)果集 
				SELECT  * from user_temporary;  
               
    #語(yǔ)句執(zhí)行結(jié)束  
                   
         end;
         
END

注意類(lèi)型為存儲(chǔ)過(guò)程 procedure 不是存儲(chǔ)函數(shù)function

運(yùn)行結(jié)果：

真實(shí)需求，查找出所有用建單情況

BEGIN
        DROP TABLE if  exists user_temporary;
				create temporary table if not exists user_temporary
				(
						id	VARCHAR(64) primary key,id
						user_name VARCHAR(20) ,#姓名
						company_name VARCHAR(20) ,#所屬公司
						worksheet_num INTEGER,			#機(jī)會(huì)點(diǎn)總數(shù)
						sign_worksheet_num INTEGER  ,#簽單數(shù)量
						exchange_num INTEGER ,#填寫(xiě)交流記錄次數(shù)
						sales_volume double(20,2) #銷(xiāo)售額
					) ;
         begin
   
           #定義 變量  
			declare a_id VARCHAR(64);  
			declare b_user_name VARCHAR(20);
			declare c_company_name VARCHAR(20);
			declare d_worksheet_num int ;
			declare e_sign_worksheet_num int ;
			declare f_exchange_num int ;
			declare g_sales_volume double(20,2) ;
					 
         
           #這個(gè)用于處理游標(biāo)到達(dá)最后一行的情況  
  
           DECLARE s int default 0;  
             
           #聲明游標(biāo)cursor_name（cursor_name是個(gè)多行結(jié)果集）  
  
  
           DECLARE cursor_name CURSOR FOR 
						select a.id ,a.name ,o.name AS company_name   from sys_user a  LEFT JOIN sys_office o on a.company_id =o.id;  
 
           #設(shè)置一個(gè)終止標(biāo)記  
    
           DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET s=1;  
           
                #打開(kāi)游標(biāo)  
  
  
                OPEN cursor_name;  
                      
                    #獲取游標(biāo)當(dāng)前指針的記錄，讀取一行數(shù)據(jù)并傳給變量a,b  
  
                    fetch  cursor_name into a_id,b_user_name ,c_company_name;  
                    #開(kāi)始循環(huán)，判斷是否游標(biāo)已經(jīng)到達(dá)了最后作為循環(huán)條件   
  
  
                    while s <> 1 do  
                          
 
                      #讀取下一行的數(shù)據(jù)  
									
					#聲明輸入變量，以便在sql串中拼接
										 
					set @userId=a_id;
					set @beginDate=begin_date;
					set @endDate=end_date;
										
 
 
					#收集總機(jī)會(huì)點(diǎn) 有if判斷用拼接sql,然后再解析執(zhí)行sql,
					set  @exesqlAll =CONCAT('SELECT count(1) into @handle_num FROM crm_worksheet  
												
										where  create_by=@userId and del_flag=0 ');
 
						IF begin_date is not null and begin_date !=''  THEN
						set		@exesqlAll =CONCAT(@exesqlAll,' AND TO_DAYS(create_date) >=TO_DAYS(@beginDate)');
						END IF;
				
						IF end_date is not null and end_date !='' THEN
						set		@exesqlAll =CONCAT(@exesqlAll,' AND TO_DAYS(create_date) <=TO_DAYS(@endDate)');
						END IF;
 
						
					prepare allWorksheet from @exesqlAll;	#解析sql
					execute allWorksheet;					#執(zhí)行sql
					DEALLOCATE prepare allWorksheet;		#釋放sql
					SET  d_worksheet_num  = @handle_num;	#變量賦值
 
 
					IF d_worksheet_num > 0 THEN
 
 
						set  @exesqlSign =CONCAT('SELECT count(1) into @sign_num FROM crm_worksheet  
												
										where  create_by=@userId and del_flag=0  and important_degree=''sys_basic_qian_shu_he_tong'' ');
 
							IF begin_date is not null and begin_date !=''  THEN
							set		@exesqlSign =CONCAT(@exesqlSign,' AND TO_DAYS(create_date) >=TO_DAYS(@beginDate)');
							END IF;
					
							IF end_date is not null and end_date !='' THEN
							set		@exesqlSign =CONCAT(@exesqlSign,' AND TO_DAYS(create_date) <=TO_DAYS(@endDate)');
							END IF;
 
						
						prepare signWorksheet from @exesqlSign;
						execute signWorksheet;
						DEALLOCATE prepare signWorksheet;
						SET  e_sign_worksheet_num  = @sign_num;
 
					
 
						#收集交流次數(shù)
						set  @exesqlExchange =CONCAT('SELECT  COUNT(1) into @exchange_num from crm_wkst_exchange_record  e LEFT JOIN 
						crm_worksheet w on e.worksheet_no= w.worksheet_no where w.create_by=@userId and w.del_flag=0');
 
						IF begin_date is not null and begin_date !=''  THEN
						set		@exesqlExchange =CONCAT(@exesqlExchange,' AND TO_DAYS(w.create_date) >=TO_DAYS(@beginDate)');
						END IF;
				
						IF end_date is not null and end_date !='' THEN
						set		@exesqlExchange =CONCAT(@exesqlExchange,' AND TO_DAYS(w.create_date) <=TO_DAYS(@endDate)');
						END IF;
 
						
						prepare exchangeWorksheet from @exesqlExchange;
						execute exchangeWorksheet;
						DEALLOCATE prepare exchangeWorksheet;
						SET  f_exchange_num  = @exchange_num;
 
 
 
 
						#收集銷(xiāo)售額
						set  @exesqlSales =CONCAT('SELECT		 (@sumSalary := @sumSalary + solution) AS count   into @sales_num   FROM crm_worksheet cw , (SELECT @sumSalary :=	 0) b
									WHERE  cw.create_by=@userId and important_degree=''sys_basic_qian_shu_he_tong'' and cw.del_flag=0 ORDER BY   count desc limit 1 ');
 
						IF begin_date is not null and begin_date !=''  THEN
						set		@exesqlExchange =CONCAT(@exesqlExchange,' AND TO_DAYS(cw.create_date) >=TO_DAYS(@beginDate)');
						END IF;
				
						IF end_date is not null and end_date !='' THEN
						set		@exesqlExchange =CONCAT(@exesqlExchange,' AND TO_DAYS(cw.create_date) <=TO_DAYS(@endDate)');
						END IF;
 
						
						prepare salesWorksheet from @exesqlSales;
						execute salesWorksheet;
						DEALLOCATE prepare salesWorksheet;
						SET  g_sales_volume  = @sales_num;
 
 
					ELSE  
							 SET e_sign_worksheet_num=0; SET f_exchange_num=0; SET g_sales_volume=0;
 
					END IF;
 
                    insert into user_temporary(id,user_name,company_name,sign_worksheet_num,exchange_num,worksheet_num,sales_volume)
																	values(a_id,b_user_name,c_company_name,e_sign_worksheet_num,f_exchange_num,d_worksheet_num,g_sales_volume);  #插入臨時(shí)表
    
                             fetch  cursor_name into a_id,b_user_name ,c_company_name; 
                      
                    end while;  
                   
                 #關(guān)閉游標(biāo)  
  
                 CLOSE cursor_name ;  
         
				#從臨時(shí)表中查出結(jié)果集
				set @userIdInput=user_id;
				set  @exesqlResult =CONCAT('SELECT  user_name,company_name,sign_worksheet_num,exchange_num,worksheet_num,sales_volume  from user_temporary');
 
				IF user_id  is not null and user_id !=''  THEN
					set		@exesqlResult =CONCAT(@exesqlResult,'  where id = @userIdInput');
					END IF;
						
				prepare resultUser from @exesqlResult;
					execute resultUser;
				DEALLOCATE prepare resultUser;
 
               
    #語(yǔ)句執(zhí)行結(jié)束  
                   
         end;
        
END

運(yùn)行結(jié)果