Home > Database > Mysql Tutorial > 交叉制表--检查列的计数值和长度并加入行数据(9)

交叉制表--检查列的计数值和长度并加入行数据(9)

WBOY
Release: 2016-06-07 14:54:33
Original
1171 people have browsed it

交叉制表--检查列的计数值和长度并加入行数据(9) 交叉表 --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 countif (select count(*) from #colnames)1023begin drop table #colnames raiserror 51004 'distinct co

交叉制表--检查列的计数值和长度并加入行数据(9)
交叉表
--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)  
Copy after login
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template