交叉制表--检查列的计数值和长度并加入行数据(9)

--除了需要证实列的计数值和名称长度,如果一切正常用户还需要填写#rownames表
--check column count
if (select count(*) from #colnames)>1023
begin
 drop table #colnames
 raiserror 51004 'distinct column count exceeded max of 1023'
 return -1
end
--verify colnames do not exceed max length
if (select max(datalength(rtrim(colname))-1) from #colnames)>29
begin
 drop table #colnames
 raiserror 51050 'column data length exceeded max of 30'
 return -1
end
--if all is ok ,continue to add #rownames data
select @chvexec='insert #rownames select distinct '+
 case @introwtype
 when 1 then 'convert(varchar(255),' else ''
 end +rtrim(@chrrowhead)+
 case @introwtype
 when 1 then ')'
 else ''
 end +'from '+@chrsource
--print @chvexec
exec(@chvexec)