1、 背景sql
SQL Server,若是咱們須要把數據庫A的全部表數據到數據庫B中,一般咱們會怎麼作呢?我會使用SSMS的導入導出功能,進行表數據的導入導出,無可厚非,這樣的導入很是簡單和方便;數據庫
可是,當咱們的表有上百個,並且有些表是有自增ID的,那麼這個時候使用SSMS的話,你須要一個個手動設置(如圖1),你要知道,須要設置上百個的這些選項是件多麼痛苦的事情,並且最後極可能會由於外鍵約束致使導入導出失敗。ide
(圖1)spa
雖然SSMS在導入導出的最後一步提供了生成SSIS包的功能,可是對於轉移數據的需求來講,仍是沒法達到我想要的快速、方便。code
天然而然,我想到了INSERT INTO XX SELECT FROM XX WHERE這樣的方式(這種方式的好處就是能夠對數據記錄、字段進行控制),可是如何才能快速生成整個數據庫全部表的這些語句呢?blog
假如你須要批量生成下面的SQL,我想這篇文章就能夠幫到你了:get
--[OpinionList] SET IDENTITY_INSERT [master_new].[dbo].[OpinionList] ON INSERT INTO [master_new].[dbo].[OpinionList](Id,Batch,LinkId,DB_Names,CreateTime) SELECT * FROM [DBA_DB].[dbo].[OpinionList] SET IDENTITY_INSERT [master_new].[dbo].[OpinionList] OFF GO
2、 腳本解釋string
(一) 我編寫了一個模板,這個模板你只須要設置@fromdb和@todb的名稱,這樣就會生成從@fromdb導出全部表插入到@todb中的SQL語句,須要注意的是:要選擇@fromdb對應的數據庫執行模板SQL,否則沒法生成須要的表和字段。it
DECLARE @fromdb VARCHAR(100) DECLARE @todb VARCHAR(100) DECLARE @tablename VARCHAR(100) DECLARE @columnnames NVARCHAR(300) DECLARE @isidentity NVARCHAR(30) DECLARE @temsql NVARCHAR(max) DECLARE @sql NVARCHAR(max) SET @fromdb = 'master' SET @todb = 'master_new' --遊標 DECLARE @itemCur CURSOR SET @itemCur = CURSOR FOR SELECT '['+[name]+']' from sys.tables WHERE type='U' order by name OPEN @itemCur FETCH NEXT FROM @itemCur INTO @tablename WHILE @@FETCH_STATUS=0 BEGIN SET @sql = '' --獲取表字段 SET @temsql = N' BEGIN SET @columnnamesOUT ='''' SELECT @columnnamesOUT = @columnnamesOUT + '','' + name From sys.columns where object_id=OBJECT_ID(''['+@fromdb+'].dbo.'+@tablename+''') order by column_id SELECT @columnnamesOUT=substring(@columnnamesOUT,2,len(@columnnamesOUT)) END ' EXEC sp_executesql @temsql,N'@columnnamesOUT NVARCHAR(300) OUTPUT',@columnnamesOUT=@columnnames OUTPUT PRINT ('--'+@tablename) --判斷是否有自增字段 SET @temsql = N' BEGIN SET @isidentityOUT ='''' SELECT @isidentityOUT = name From sys.columns where object_id=OBJECT_ID(''['+@fromdb+'].dbo.'+@tablename+''') and is_identity = 1 END ' EXEC sp_executesql @temsql,N'@isidentityOUT NVARCHAR(30) OUTPUT',@isidentityOUT=@isidentity OUTPUT --IDENTITY_INSERT ON IF @isidentity != '' BEGIN SET @sql = 'SET IDENTITY_INSERT ['+@todb+'].[dbo].['+@tablename+'] ON ' END --INSERT SET @sql = @sql+'INSERT INTO ['+@todb+'].[dbo].['+@tablename+']('+@columnnames+') SELECT * FROM ['+@fromdb+'].[dbo].['+@tablename+']' --IDENTITY_INSERT OFF IF @isidentity != '' BEGIN SET @sql = @sql+' SET IDENTITY_INSERT ['+@todb+'].[dbo].['+@tablename+'] OFF' END --返回SQL PRINT(@sql)PRINT('GO')+CHAR(13) FETCH NEXT FROM @itemCur INTO @tablename END CLOSE @itemCur DEALLOCATE @itemCur
(二) 下面就是返回的生成的部分腳本,模板會自動判斷表是否存在自增字段,若是存在就會生成對應的IDENTITY_INSERT語句。io
--spt_values INSERT INTO [master_new].[dbo].[spt_values](name,number,type,low,high,status) SELECT * FROM [master].[dbo].[spt_values] GO --[OpinionList] SET IDENTITY_INSERT [master_new].[dbo].[OpinionList] ON INSERT INTO [master_new].[dbo].[OpinionList](Id,Batch,LinkId,DB_Names,CreateTime) SELECT * FROM [DBA_DB].[dbo].[OpinionList] SET IDENTITY_INSERT [master_new].[dbo].[OpinionList] OFF GO