sql server复制表数据到另外一个表的存储过程

if    exists (select * from sysobjects where id=object_id('GenerateData') and  OBJECTPROPERTY(id, 'IsProcedure') =1 )
    Drop Procedure GenerateData
go
CREATE PROCEDURE GenerateData 
@tablename sysname --同一数据库下的表名
AS 
begin
    declare @column varchar(2000) 
    declare @columndata varchar(2000) 
    declare @sql varchar(8000) 
    declare @xtype tinyint 
    declare @name sysname 
    declare @objectId int 
    declare @objectname sysname 
    declare @ident int 

    set nocount on 
    set @objectId=object_id(@tablename) 

    if @objectId is null -- 判断对象是否存在 
    begin 
        print 'The object not exists' 
        return 
    end 
    set @objectname=rtrim(object_name(@objectId)) 

    if @objectname is null or charindex(@objectname,@tablename)=0 --此判断不严密 
    begin 
        print 'object not in current database' 
        return 
    end 

    if OBJECTPROPERTY(@objectId,'IsTable') < > 1 -- 判断对象是否是table 
    begin 
        print 'The object is not table' 
        return 
    end 

    select @ident=status&0x80 from syscolumns where id=@objectid and status&0x80=0x80 

    if @ident is not null 
    print 'SET IDENTITY_INSERT '+@TableName+' ON' 

    declare syscolumns_cursor cursor
    for select c.name,c.xtype from syscolumns c 
    where c.id=@objectid order by c.colid 

    open syscolumns_cursor 
    set @column='' 
    set @columndata='' 
    fetch next from syscolumns_cursor into @name,@xtype 

    while @@fetch_status < >-1 
    begin 
        if @@fetch_status < >-2 
        begin 
            if @xtype not in(189,34,35,99,98) --timestamp不需处理，image,text,ntext,sql_variant 暂时不处理 

            begin 
                set @column=@column+case when len(@column)=0 then'' else ','end+@name 

                set @columndata=@columndata+case when len(@columndata)=0 then '' else ','','','end 
                +case when @xtype in(167,175) then '''''''''+'+@name+'+''''''''' --varchar,char 
                when @xtype in(231,239) then '''N''''''+'+@name+'+''''''''' --nvarchar,nchar 
                when @xtype=61 then '''''''''+convert(char(23),'+@name+',121)+''''''''' --datetime 
                when @xtype=58 then '''''''''+convert(char(16),'+@name+',120)+''''''''' --smalldatetime 
                when @xtype=36 then '''''''''+convert(char(36),'+@name+')+''''''''' --uniqueidentifier 
                else @name end 

            end 

        end 

        fetch next from syscolumns_cursor into @name,@xtype 

    end 

    close syscolumns_cursor 
    deallocate syscolumns_cursor 

    set @sql='set nocount on select ''insert into '+@tablename+'('+@column+') values(''as ''--'','+@columndata+','')'' from '+@tablename 

    print '--'+@sql 
    exec(@sql) 

    if @ident is not null 
    print 'SET IDENTITY_INSERT '+@TableName+' OFF' 
end
GO