《Mysql必讀mysql存儲過程 在動態SQL內獲取返回值的方法詳解》要點：
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MySql通用分頁存儲過程
過程參數
代碼如下:
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;
? #依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 $
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;??
#預處置動態SQL??
prepare stmt from @sqlcounts;??
#傳遞動態SQL內參數??
set @s1= categoryid;??
execute stmt using @s1;??
deallocate prepare stmt;??
#獲取動態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;
#預處理動態SQL
prepare stmt from @sqlcounts;
#傳遞動態SQL內參數
set @s1= categoryid; execute stmt using @s1; deallocate prepare stmt;
#獲取動態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SQL里將查詢到的count記錄條數通過變量@recordcount放到recordcount里面了.
mysql的IF ELSE和其他數據庫的判斷有點紛歧樣,簡單的判斷語句如下.
代碼如下:
#依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;?
#依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;
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