数据库游标结合临时表的使用

一、创建临时表定义相关的变量:
CREATE TABLE #tempTable --创建临时表
(
MainTradeCode int,
SubTradeCode int,
SubTradeName varchar(50)
)
DECLARE @keyword varchar(200)
DECLARE @SearchCount int
二、创建游标：
DECLARE keywordCur CURSOR local FOR
SELECT TOP 8 count(*) AS SearchCount,keyword
FROM KeywordBySearch
WHERE InfoType='sell'
GROUP BY KeywordBySearch.keyword
ORDER BY SearchCount DESC
三、打开游标获得数据并往临时表中插入数据：
OPEN keywordCur
FETCH NEXT FROM keywordCur INTO @SearchCount,@keyword

WHILE @@FETCH_STATUS=0
BEGIN
INSERT INTO #tempTable
SELECT TOP 1 sd.TradeCode AS MainTradeCode,SubTrade AS SubTradeCode,
(SELECT SubTrades.TradeName FROM SubTrades WHERE SubTrades.TradeCode=sd.SubTrade) AS SubTradeName
FROM SupplyDemand sd
WHERE Keywords LIKE '%'+ @keyword +'%'
ORDER BY sd.SdId desc
FETCH NEXT FROM keywordCur INTO @SearchCount,@keyword
END
四、删除游标、返回临时表数据和删除临时表：
CLOSE keywordCur
DEALLOCATE keywordCur
SELECT * FROM #tempTable
DROP TABLE #tempTable

由于游标比较耗性能，在大量数据的场合不太适合使用游标.
可用同样的方法操作游标和用户表