mysql儲存過程 在動態SQL內獲取返回值
阿新 • • 發佈:2019-02-09
MySql通用分頁儲存過程 過程引數
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SQL語句返回值 set p_recordcount = @recordcount; #根據總記錄跳數計算出總頁數 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 $
Sql程式碼
- #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;
- #預處理動態SQL
- prepare stmt from @sqlcounts;
- #傳遞動態SQL內參數
- set @s1= categoryid;
- execute stmt using @s1;
- deallocateprepare stmt;
- #獲取動態SQL語句返回值
- set
以上我上再做儲存過程分頁裡用到動態SQL裡將查詢到的count記錄條數通過變數@recordcount放到recordcount裡面了。
mysql的IF ELSE和其他資料庫的判斷有點不一樣,簡單的判斷語句如下。
Sql程式碼- #根據總記錄跳數計算出總頁數
- 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;