《Mysql必讀mysql存儲(chǔ)過(guò)程 在動(dòng)態(tài)SQL內(nèi)獲取返回值的方法詳解》要點(diǎn)：
本文介紹了Mysql必讀mysql存儲(chǔ)過(guò)程 在動(dòng)態(tài)SQL內(nèi)獲取返回值的方法詳解，希望對(duì)您有用。如果有疑問(wèn)，可以聯(lián)系我們。
MySql通用分頁(yè)存儲(chǔ)過(guò)程
過(guò)程參數(shù)
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(yǔ)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(dòng)態(tài)SQL語(yǔ)句返回值
? set p_recordcount = @recordcount;
? #依據(jù)總記錄跳數(shù)計(jì)算出總頁(yè)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(yè)查詢記錄的動(dòng)態(tài)SQL語(yǔ)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(yǔ)句??
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);??
set @sqlcounts := v_sqlcounts;??
#預(yù)處置動(dòng)態(tài)SQL??
prepare stmt from @sqlcounts;??
#傳遞動(dòng)態(tài)SQL內(nèi)參數(shù)??
set @s1= categoryid;??
execute stmt using @s1;??
deallocate prepare stmt;??
#獲取動(dòng)態(tài)SQL語(yǔ)句返回值??
set recordcount = @recordcount;?
#拼接查詢總記錄的SQL語(yǔ)句
set v_sqlcounts = concat('select count(*) into @recordcount from ',v_tables,v_where);
set @sqlcounts := v_sqlcounts;
#預(yù)處理動(dòng)態(tài)SQL
prepare stmt from @sqlcounts;
#傳遞動(dòng)態(tài)SQL內(nèi)參數(shù)
set @s1= categoryid; execute stmt using @s1; deallocate prepare stmt;
#獲取動(dòng)態(tài)SQL語(yǔ)句返回值
set recordcount = @recordcount;
以上我上再做存儲(chǔ)過(guò)程分頁(yè)里用到動(dòng)態(tài)SQL里將查詢到的count記錄條數(shù)通過(guò)變量@recordcount放到recordcount里面了.
mysql的IF ELSE和其他數(shù)據(jù)庫(kù)的判斷有點(diǎn)紛歧樣,簡(jiǎn)單的判斷語(yǔ)句如下.
代碼如下:
#依據(jù)總記錄跳數(shù)計(jì)算出總頁(yè)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;?
#依據(jù)總記錄跳數(shù)計(jì)算出總頁(yè)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;
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