我可以同時將更新語句應用於多個數據庫嗎？

Question

說我要運行以下命令：

update users set age = 10 

上的數據庫：

db1, db2, db3 

所有在同一臺服務器上，我想遍歷並執行相同的操作。

目前我正在通過下拉菜單使用management studio進行手動操作。

希望有更好的辦法。

Answer 1

不知道這樣做是「動態的」，即FOR-EACH在一個服務器中的所有數據庫風格循環，但這應該工作：

USE db1 
    update users set age = 10 
GO 
USE db2 
    update users set age = 10 
GO 
USE db3 
    update users set age = 10 

Answer 2

指定的服務器作爲中央管理服務器，然後將其他服務器添加到服務器組。然後，您可以在組中的所有數據庫上運行更新。 http://msdn.microsoft.com/en-us/library/bb934126.aspx

Answer 3

你也許可以用動態SQL做到這一點。事情是這樣：

create table #dbs (db_name sysname not null) 
insert into #dbs values ('db1'),('db2'),('db3') 

declare curs cursor for 
select db_name from #dbs 
declare @db sysname, @sql nvarchar(max) 
open curs 

while(1=1) 
begin 
    fetch next from curs into @db 
    if (@@fetch_status <> 0) 
     break 
    set @sql = 'update ' + quotename(@db) + '.dbo.users set age = 10' 
    exec(@sql) 
end 
close curs 
deallocate curs 
drop table #dbs 

Answer 4

use [WWAUTHxxx__] -- a db containing active databases. 
set nocount on 
declare @Catalog as nvarchar(32) 
declare @LibraryName as varchar(255) 
declare @dbtable as varchar(50) 
declare @retval as nvarchar(50) 
declare @sSQL as nvarchar(max) 
declare @parmdef as nvarchar(500) 
declare @retvalout as nvarchar(50) 
Declare Library_Cursor Cursor for 
    select top(1000) xCatalog, xLibraryName 
      from Active_DBs 
order by xcatalog 
    Open Library_Cursor; 
Fetch Next from Library_Cursor into @Catalog, @LibraryName 
    while @@Fetch_status = 0 
     begin 
     set @dbTable = @Catalog + '.dbo.las_circperiods' 
     set @ParmDef = N'@retvalOUT int OUTPUT'; 
     set @sSQL = N'Select @retvalout = count(*) from ' + @dbtable 
       + ' where xlastcircdate is null' 
     exec sp_executesql @ssql,@parmdef,@retvalout=@retval output 


    if @retval > 0 -- check/print Sql and then activate. 
        -- I like checking to see the potentially affected databases. 
      begin 
       print @Catalog + ',' + @LibraryName + ',' + @retval 
       set @ssql = N'update ' + @dbTable 
       + ' set xlastcircdate = '''' ' 
       + ' where xlastcircdate is null' 

     -- print @ssql -- View what you might will do 
     exec sp_executesql @ssql -- Do it. 
      end 

     Fetch Next from Library_Cursor into @Catalog, @LibraryName 
     end; 
    close Library_cursor 
    Deallocate Library_cursor