更新时间:2021-12-26 22:09:39
以防万一将来对某人有帮助,这是我针对此问题的解决方案.有关如何提出该命令的完整历史,请参见将视图从当前数据库复制到另一个数据库的存储过程
In case this helps someone in the future, here's my solution to this problem. The full history of how I came up with it is over at Stored Procedure to Copy Views from Current Database to Another
CREATE PROCEDURE [dbo].[usp_Copy_View_To_Database]
@ViewName SYSNAME, -- The name of the view to copy over
@DatabaseName SYSNAME, -- The name of the database to copy the view to
@overwrite bit = 1 -- Whether to overwrite any existing view
AS
IF DB_ID(@DatabaseName) IS NULL -- Validate the database name exists
BEGIN
RAISERROR('Invalid Destination Database Name passed',16,1)
RETURN
END
SET NOCOUNT ON
IF @overwrite = 1 -- If set to overwrite, try to drop the remote view
BEGIN
DECLARE @DropViewStatement NVARCHAR(MAX) =
'EXEC ' + QUOTENAME(@DatabaseName) + '.sys.sp_executesql N''DROP VIEW IF EXISTS ' + QUOTENAME(@ViewName) + ';'';'
EXEC (@DropViewStatement);
END
-- Extract the saved definition of the view
DECLARE @ViewDefinition NVARCHAR(MAX);
SELECT @ViewDefinition = definition FROM sys.sql_modules WHERE [object_id] = OBJECT_ID(@ViewName);
-- Check for a mismatch between the internal view name and the expected name (TODO: Resolve this automatically?)
IF @ViewDefinition NOT LIKE ('%' + @ViewName + '%')
BEGIN
DECLARE @InternalName NVARCHAR(MAX) = SUBSTRING(@ViewDefinition, 3, CHARINDEX(char(10), @ViewDefinition, 3)-4);
PRINT ('Warning: The view named '+@ViewName+' has an internal definition name that is different ('+@InternalName+'). This may have been caused by renaming the view after it was created. You will have to drop and recreate it with the correct name.')
END
-- Substitute any hard-coded references to the current database with the destination database
SET @ViewDefinition = REPLACE(@ViewDefinition, db_name(), @DatabaseName);
-- Generate the dynamic SQL that will create the view on the remote database
DECLARE @CreateViewStatement NVARCHAR(MAX) =
'EXEC ' + QUOTENAME(@DatabaseName) + '.sys.sp_executesql N''' + REPLACE(@ViewDefinition,'''','''''') + ''';'
--PRINT '@CreateViewStatement: ' + @CreateViewStatement -- Can be used for debugging
-- Execute the create statement
EXEC (@CreateViewStatement);
简而言之,您需要两层嵌套的动态SQL:
In short, you need two layers of nested dynamic SQL:
EXEC SomeDatabase.sys.sp_executesql @CreateViewSQL
在原始发布者的暂定解决方案的内部循环中调用上述存储的proc应该可以解决将视图复制到另一个数据库的问题.
Calling the above stored proc in the inner-loop of the original poster's tentative solution should solve the problem of copying a view to another database.
请注意,如果视图彼此依赖,则仅循环浏览所有视图可能会带来挑战.可能存在一些其他复杂性,其中包括解析视图的依赖关系树并以正确的顺序复制视图.可替代地,简单而又简单"的解决方案包括:方法可能是遍历所有视图,忽略故障,并不断重复该过程,直到创建完所有视图为止.
Note that simply looping over all views might pose a challenge if views depend on one another. There may be some additional complexity involving resolving the dependency tree of views an copying them in the correct order. Alternatively, a "dumb and easy" approach might be to loop over all views, ignore failures, and keep repeating the process until all views have been created.