我有生产数据库(例如,PROD1
)。它与其他数据库有很多同义词(例如,PROD2
)。
我创建了PROD2_TEST
(作为PROD2
的完整副本)和PROD1_TEST
(作为PROD1
的完整副本)。但结果是PROD1_TEST
代表了PROD2
,而不是PROD2_TEST
。
如何自动重新创建测试数据库的所有同义词?
答案 0 :(得分:6)
基于@artm建议我将它扩展了一点,以包含参数以使其更通用。这是代码
DECLARE @newDB VARCHAR(MAX) = 'newDB', --newDB to point the synonym to
@linkedSrv VARCHAR(MAX) = null --if the synonym points to a linked server than specify it here like '[LinkedSrv].' (including the dot in the end)
SELECT 'Drop Synonym [' + SCHEMA_NAME(schema_id) + '].[' + PARSENAME(base_object_name, 1) + '];' AS dropSynonym,
' CREATE SYNONYM [' + SCHEMA_NAME(schema_id) + '].[' + UPPER(PARSENAME(base_object_name, 1)) + '] FOR '
+ COALESCE(@linkedSrv, '') + '[' + @newDB + '].[' + COALESCE(PARSENAME(base_object_name, 2),
SCHEMA_NAME(SCHEMA_ID())) + '].['
+ UPPER(PARSENAME(base_object_name, 1)) + '];' AS createSynonym
FROM sys.synonyms`
答案 1 :(得分:5)
出于同样的原因,我必须这样做,这是我使用的查询。运行查询,将结果复制粘贴到新服务器(PROD_Test)并运行生成的查询。它处理不同的模式名称和多个数据库,以防您使用它们:
SELECT 'Drop Synonym [' + SCHEMA_NAME(schema_id) + '].[' + PARSENAME(base_object_name,1) + '];CREATE SYNONYM [' +
SCHEMA_NAME(schema_id) + '].[' + PARSENAME(base_object_name,1) + '] FOR [' + COALESCE(PARSENAME(base_object_name,3),DB_NAME(DB_ID())) + '_Test].['
+ COALESCE(PARSENAME(base_object_name,2),SCHEMA_NAME(SCHEMA_ID())) + '].[' + PARSENAME(base_object_name,1) + '];'
FROM sys.synonyms
答案 2 :(得分:1)
无法更改同义词,您必须删除并创建它们。以下文章包含用于为一系列表创建同义词的脚本。希望您可以根据自己的需要进行修改:
Use synonyms to abstract SQL Server objects
您可以使用sys.synonyms
视图查看所有现有同义词。在伪代码中,您要做的是:
name
和base_object_name
PROD2
更改为PROD2_TEST
答案 3 :(得分:1)
以下是我用来将所有同义词重新映射到同一服务器上的新数据库的内容(基于Tobsey的建议)
SET NOCOUNT ON;
DECLARE @db_name SYSNAME
DECLARE @schema_name SYSNAME
DECLARE @cmd NVARCHAR(256)
SET @schema_name = N'dbo'
SET @db_name = N'[newdb]'
DECLARE @schema_id INT
SELECT @schema_id = schema_id
FROM sys.schemas
WHERE NAME = @schema_name;
DECLARE @table_list TABLE (table_name SYSNAME,dest_table_name sysname,dest_schema_name sysname)
DECLARE @table_name SYSNAME
declare @dest_table_name sysname
declare @dest_schema_name sysname
DECLARE @prefix NVARCHAR(50)
DECLARE @synonym SYSNAME
DECLARE @linked_server SYSNAME
SET @linked_server = N'SERVER'
-- create a synonym for these tables (insert each table)
INSERT INTO @table_list (table_name,dest_table_name,dest_schema_name)
SELECT name
,'['+SUBSTRING(name,CHARINDEX('.',name,CHARINDEX('.',name,0)+1)+1,LEN(name)-CHARINDEX('.',name,CHARINDEX('.',name,0)+1))+']'
,SUBSTRING(name,CHARINDEX('.',name,0)+1,CHARINDEX('.',name,CHARINDEX('.',name,0)+1)-CHARINDEX('.',name,0)-1)
FROM sys.synonyms
WHERE base_object_name LIKE '![SERVER!].![olddb!]%' ESCAPE ('!')
ORDER BY name
IF EXISTS (
SELECT *
FROM sys.servers
WHERE NAME = @linked_server
)
-- 4 part name
SET @prefix = @linked_server + N'.' + @db_name
ELSE
-- 3 part name
SET @prefix = @db_name
SELECT TOP 1 @table_name = table_name,@dest_table_name = dest_table_name,@dest_schema_name=dest_schema_name
FROM @table_list
WHILE @table_name IS NOT NULL
BEGIN
-- set the schema and name for the synonym
SET @synonym = @schema_name+ N'.' + '['+@table_name+']'
-- delete the synonym if it exists
IF EXISTS (
SELECT *
FROM sys.synonyms
WHERE NAME = @table_name
AND schema_id = @schema_id
)
BEGIN
SET @cmd = N'drop synonym ' + @synonym
PRINT @cmd
--EXEC sp_executesql @cmd
END
-- create the synonym
SET @cmd = N'create synonym ' + @synonym + N' for ' + @prefix + N'.'+ @dest_schema_name + N'.'+ @dest_table_name
PRINT @cmd
--EXEC sp_executesql @cmd
PRINT 'GO'
DELETE TOP (1)
FROM @table_list
SET @table_name = NULL
SELECT TOP 1 @table_name = table_name,@dest_table_name = dest_table_name,@dest_schema_name=dest_schema_name
FROM @table_list
END
GO