交叉制表-验证对象的存在(3) 交叉表 --通过考察sysobjects 表可以验证源对象的存在性.所有提供的三个列分别被检查以查看---他们对于提供的源对象在syscolumns表中是否存在. --check if source exists if not exists (select * from sysobjects where name=@c
交叉制表-验证对象的存在(3) 交叉表--通过考察sysobjects 表可以验证源对象的存在性.所有提供的三个列分别被检查以查看---他们对于提供的源对象在syscolumns表中是否存在.
--check if source exists
if not exists
(select * from sysobjects where name=@chrsource and type in(''v'',''u''))
begin
raiserror 51001 ''source does not exist.''
return -1
end
--check for column existence
if not exists
(select sc.name from syscolumns sc join sysobjects so on sc.id=so.id
where so.name=@chrsource and sc.name=@chrhead)
begin
raiserror 51002 ''invalid @chrcolhead name''
return -1
end
if not exists
(select sc.name from syscolumns sc join sysobjects so on sc.id=so.id
where so.name=@chrsource and sc.name=@chrrowhead)
begin
raiserror 51002 ''invalid @chrrowhead name''
return -1
end
if not exists
(select sc.name from syscolumns sc join sysobjects so on sc.id=so.id
where so.name=@chrsource and sc.name=@chrvalue)
begin
raiserror 51002 ''invalid @chrvalue name''
return -1
end
--verify type is valid 1(sum) 2(avg) etc...
if @inytype<1 or @inytype>5
-- if @inytype not between 1 and 5
begin
raiserror 51000 ''invalid crosstab type''
return -1
end
