交叉制表-验证对象的存在(3)

--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