批量给数据库表加字段

 

declare @tablename varchar(50)

       ,@sql varchar(1000)

       ,@dbname varchar(50)

set @dbname=DB_NAME()



declare addcolumn_Cusor cursor  for select name from sys.tables 



open addcolumn_Cusor

fetch next from addcolumn_Cusor into @tablename

while(@@fetch_status=0)

begin



set @sql='IF NOT EXISTS (SELECT 1 FROM '+@dbname+'.dbo.SYSCOLUMNS WHERE ID=OBJECT_ID('''+@dbname+'.dbo.'+@tablename+''') AND NAME=''CreateDate'')'



set @sql += 'alter table '+@tablename+' add CreateDate datetime default(getdate())'



set @sql+='IF NOT EXISTS (SELECT 1 FROM '+@dbname+'.dbo.SYSCOLUMNS WHERE ID=OBJECT_ID('''+@dbname+'.dbo.'+@tablename+''') AND NAME=''Creator'')'



set @sql += 'alter table '+@tablename+' add Creator nvarchar(12)'



set @sql+='IF NOT EXISTS (SELECT 1 FROM '+@dbname+'.dbo.SYSCOLUMNS WHERE ID=OBJECT_ID('''+@dbname+'.dbo.'+@tablename+''') AND NAME=''UpdateDate'')'



set @sql += 'alter table '+@tablename+' add UpdateDate datetime default(getdate())'



set @sql+='IF NOT EXISTS (SELECT 1 FROM '+@dbname+'.dbo.SYSCOLUMNS WHERE ID=OBJECT_ID('''+@dbname+'.dbo.'+@tablename+''') AND NAME=''Updator'')'



set @sql += 'alter table '+@tablename+' add Updator nvarchar(12)'



exec(@sql)



fetch next from addcolumn_Cusor into @tablename

end

close addcolumn_Cusor

deallocate addcolumn_Cusor