快捷導(dǎo)航

mysql存儲過程在動態(tài)SQL內(nèi)獲取返回值的方法詳解

更新時(shí)間：2013年06月19日 14:54:39 作者：

本篇文章是對mysql存儲過程在動態(tài)SQL內(nèi)獲取返回值進(jìn)行了詳細(xì)的分析介紹，需要的朋友參考下

MySql通用分頁存儲過程
過程參數(shù)

p_cloumns varchar(500),p_tables varchar(100),p_where varchar(4000),p_order varchar(100),p_pageindex int,p_pagesize int,out p_recordcount int,out p_pagecount int

 $:begin
    declare v_sqlcounts varchar(4000);
    declare v_sqlselect varchar(4000);
 #拼接查詢總記錄的SQL語句
   set v_sqlcounts = concat('select count(*) into @recordcount from ',p_tables,p_where);
    #select v_sqlcounts;leave $;
   set @sqlcounts = v_sqlcounts;
   prepare stmt from @sqlcounts;
        execute stmt;
  deallocate prepare stmt;
   #獲取動態(tài)SQL語句返回值
  set p_recordcount = @recordcount;
  #根據(jù)總記錄跳數(shù)計(jì)算出總頁數(shù)
   set p_pagecount = ceiling((p_recordcount+0.0)/p_pagesize);
   if p_pageindex <1 then
       set p_pageindex = 1;
     elseif p_pageindex > p_pagecount and p_pagecount <> 0 then
       set p_pageindex = p_pagecount;
   end if;
   #拼接分頁查詢記錄的動態(tài)SQL語句
   set v_sqlselect = concat('select ',p_cloumns,' from ',p_tables,p_where,if(p_order is not null,p_order,''),' limit ',(p_pageindex-1)*p_pagesize,' , ',p_pagesize);
   #select v_sqlselect;leave $;
   set @sqlselect = v_sqlselect;
    prepare stmtselect from @sqlselect;
   execute stmtselect;
    deallocate prepare stmtselect;
   end $

復(fù)制代碼代碼如下:

#拼接查詢總記錄的SQL語句   
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);   
set @sqlcounts := v_sqlcounts;   
#預(yù)處理動態(tài)SQL   
prepare stmt from @sqlcounts;   
#傳遞動態(tài)SQL內(nèi)參數(shù)   
set @s1= categoryid;   
execute stmt using @s1;   
deallocate prepare stmt;   
#獲取動態(tài)SQL語句返回值   
set recordcount = @recordcount;  

#拼接查詢總記錄的SQL語句
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);
set @sqlcounts := v_sqlcounts;
#預(yù)處理動態(tài)SQL
prepare stmt from @sqlcounts;
#傳遞動態(tài)SQL內(nèi)參數(shù)
set @s1= categoryid; execute stmt using @s1; deallocate prepare stmt;
#獲取動態(tài)SQL語句返回值
set recordcount = @recordcount;
以上我上再做存儲過程分頁里用到動態(tài)SQL里將查詢到的count記錄條數(shù)通過變量@recordcount放到recordcount里面了。
mysql的IF ELSE和其他數(shù)據(jù)庫的判斷有點(diǎn)不一樣，簡單的判斷語句如下。

復(fù)制代碼代碼如下:

#根據(jù)總記錄跳數(shù)計(jì)算出總頁數(shù)   
set pagecount = ceiling((recordcount+0.0)/pagesize);   
if pageindex <1 then  
    set pageindex = 1;   
elseif pageindex > pagecount then  
    set pageindex = pagecount;   
else  
    select pageindex,pagecount;   
end if;  

#根據(jù)總記錄跳數(shù)計(jì)算出總頁數(shù) set pagecount = ceiling((recordcount+0.0)/pagesize); if pageindex <1 then set pageindex = 1; elseif pageindex > pagecount then set pageindex = pagecount; else select pageindex,pagecount; end if;

您可能感興趣的文章: