◆1. 由于update里不能用存儲(chǔ)過(guò)程，并且由于根據(jù)更新表的某些字段還要進(jìn)行計(jì)算。所以很多人采用的是游標(biāo)的方法，在這里我們可以用函數(shù)的方法實(shí)現(xiàn)。

函數(shù)部分：

CREATE FUNCTION [DBO].[FUN_GETTIME] (@TASKPHASEID INT)

RETURNS FLOAT AS

BEGIN

DECLARE @TASKID INT,

@HOUR FLOAT,

@PERCENT FLOAT,

@RETURN FLOAT

IF @TASKPHASEID IS NULL

BEGIN

RETURN(0.0)

END

SELECT @TASKID=TASKID,@PERCENT=ISNULL(WORKPERCENT,0)/100

FROM TABLETASKPHASE

WHERE ID=@TASKPHASEID

SELECT @HOUR=ISNULL(TASKTIME,0) FROM TABLETASK

WHERE ID=@TASKID

SET @RETURN=@HOUR*@PERCENT

RETURN (@RETURN)

END

調(diào)用函數(shù)的存儲(chǔ)過(guò)程部分：

CREATE PROCEDURE [DBO].[PROC_CALCCA]

@ROID INT

AS

BEGIN

DECLARE @CA FLOAT

UPDATE TABLEFMECA

SET

Cvalue_M= ISNULL(MODERATE,0)*ISNULL

(FMERATE,0)*ISNULL(B.BASFAILURERATE,0)*[DBO].[FUN_GETTIME](C.ID)

FROM TABLEFMECA ,TABLERELATION B,TABLETASKPHASE C

WHERE ROID=@ROID AND TASKPHASEID=C.ID AND B.ID=@ROID

SELECT @CA=SUM(ISNULL(Cvalue_M,0)) FROM TABLEFMECA WHERE ROID=@ROID

UPDATE TABLERELATION

SET CRITICALITY=@CA

WHERE ID=@ROID

END

GO

◆2. 我們要根據(jù)某表的某些記錄，先計(jì)算后求和，因?yàn)闊o(wú)法存儲(chǔ)中間值，平時(shí)我們也用游標(biāo)的方法進(jìn)行計(jì)算。但SQL Server 2000里支持。

SUM ( [ ALL DISTINCT ] eXPression )

expression

是常量、列或函數(shù)，或者是算術(shù)、按位與字符串等運(yùn)算符的任意組合。因此我們可以利用這一功能。

函數(shù)部分：

CREATE FUNCTION [DBO].[FUN_RATE] (@PARTID INT,

@ENID INT,@SOURCEID INT, @QUALITYID INT,@COUNT INT)

RETURNS FLOAT AS

BEGIN

DECLARE @QXS FLOAT, @G FLOAT, @RATE FLOAT

IF (@ENID=NULL) OR (@PARTID=NULL) OR (@SOURCEID=NULL) OR (@QUALITYID=NULL)

BEGIN

RETURN(0.0)

END

SELECT @QXS= ISNULL(XS,0) FROM TABLEQUALITY WHERE ID=@QUALITYID

SELECT @G=ISNULL(FRATE_G,0) FROM TABLEFAILURERATE

WHERE (SUBKINDID=@PARTID)

AND( ENID=@ENID)

AND ( DATASOURCEID=@SOURCEID)

AND( ( (ISNULL(MINCOUNT,0)<=ISNULL(@COUNT,0))

AND ( ISNULL(MAXCOUNT,0)>=ISNULL(@COUNT,0)))

OR(ISNULL(@COUNT,0)>ISNULL(MAXCOUNT,0)))

SET @RATE=ISNULL(@QXS*@G,0)

RETURN (@RATE)

END

調(diào)用函數(shù)的存儲(chǔ)過(guò)程部分:

CREATE PROC PROC_FAULTRATE

@PARTID INTEGER, @QUALITYID INTEGER,@SOURCEID INTEGER,

@COUNT INTEGER, @ROID INT, @GRADE INT,@RATE FLOAT=0 OUTPUTAS

BEGIN

DECLARE

@TASKID INT

SET @RATE=0.0

SELECT @TASKID=ISNULL(TASKPROID,-1) FROM TABLERELATION

WHERE ID=(SELECT PID FROM TABLERELATION WHERE ID=@ROID)

IF (@TASKID=-1) OR(@GRADE=1) BEGIN

SET @RATE=0

RETURN

END

SELECT @RATE=SUM([DBO].[FUN_RATE]

(@PARTID,ENID,@SOURCEID, @QUALITYID,@COUNT) *ISNULL(WORKPERCENT,0)/100.0)

FROM TABLETASKPHASE

WHERE TASKID=@TASKID

END

GO