SQL Server 2005性能排错（5）

核心提示： create proc dbo.add_column (@add_stmt varchar(500) output,@find varchar(100)=NULL,@cols_containing varchar(500)=NULL,@col_stmt varchar(max))as Th

create proc dbo.add_column (
@add_stmt varchar(500) output,
@find varchar(100)=NULL,
@cols_containing varchar(500)=NULL,
@col_stmt varchar(max))
as
--
-- This stored procedure is provided "AS IS" with no warranties, and
-- confers no rights.
-- Use of included script samples are subject to the terms specified at
-- http://www.microsoft.com/info/cpyright.htm
--
-- T. Davidson
-- @add_stmt is the result passed back to the caller
-- @find is a keyword from @cols_containing
-- @cols_containing is the list of keywords to include in the report
-- @col_stmt is the statement that will be compared with @find.
--　If @col_stmt contains @find, include this statement.
--　set @add_stmt = @col_stmt
--
declare @length int, @strindex int, @EOS bit
if @cols_containing is NULL
begin
select @add_stmt=@col_stmt
return
end
select @add_stmt = '', @EOS = 0
while @add_stmt is not null and @EOS = 0
@dbid=-1,
select @strindex = charindex(',',@cols_containing)
if @strindex = 0
select @find = @cols_containing, @EOS = 1
else
begin
select @find = substring(@cols_containing,1,@strindex-1)
select @cols_containing =　　　
substring(@cols_containing,
@strindex+1,
datalength(@cols_containing) - @strindex)
end
select @add_stmt=case
--when @cols_containing is NULL then NULL
when charindex(@find,@col_stmt) > 0 then NULL
else ''
end
end
--- NULL indicates this statement is to be passed back through out parm @add_stmt
if @add_stmt is NULL select @add_stmt=@col_stmt
go

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