我编写了一个存储过程,从当前数据库中的每个表格的每个uniqueidentifier列中进行SELECT操作,并在找到GUID时返回结果集。
它使用INFORMATION_SCHEMA视图来查找所有基本表(而不是视图)中的所有uniqueidentifier列。对于每个列,它都会发出一个SELECT语句,返回找到该GUID的表格和列的名称。
CREATE PROCEDURE dbo.FindGUID @searchValue uniqueidentifier AS
/*
Search all tables in the database for a guid
6/9/2009: Removed the IF EXISTS to double hit the database
*/
--DECLARE @searchValue uniqueidentifier
--SET @searchValue = '{2A6814B9-8261-452D-A144-13264433864E}'
DECLARE abc CURSOR FOR
SELECT
c.TABLE_NAME, c.COLUMN_NAME
FROM INFORMATION_SCHEMA.Columns c
INNER JOIN INFORMATION_SCHEMA.Tables t
ON c.TABLE_NAME = t.TABLE_NAME
AND t.TABLE_TYPE = 'BASE TABLE'
WHERE DATA_TYPE = 'uniqueidentifier'
DECLARE @tableName varchar(200)
DECLARE @columnName varchar(200)
DECLARE @szQuery varchar(8000)
OPEN ABC
FETCH NEXT FROM abc INTO @tableName, @columnName
WHILE (@@FETCH_STATUS = 0)
BEGIN
SET @szQuery =
'SELECT '''+@tableName+''' AS TheTable, '''+@columnName+''' AS TheColumn '+
'FROM '+@tableName+' '+
'WHERE '+@columnName+' = '''+CAST(@searchValue AS varchar(50))+''''
PRINT 'Searching '+@tableName+'.'+@columnName+'..'
PRINT @szQuery
EXEC (@szQuery)
FETCH NEXT FROM abc INTO @tableName, @columnName
END
CLOSE abc
DEALLOCATE abc
我的问题是:
问题1
有没有人能够找出一种方法,将其更改为在同一张表中搜索多个唯一标识符列作为OR,而不是单独的查询。
例如:
SELECT ... FROM Prices WHERE BookGUID = '{...}'
SELECT ... FROM Prices WHERE AuthorGUID = '{...}'
SELECT ... FROM Prices WHERE PublisherGUID = '{...}'
SELECT ... FROM Prices WHERE StoreGUID = '{...}'
would become:
SELECT ...
FROM Prices
WHERE BookGUID = '{...}'
OR AuthorGUID = '{...}'
OR PublisherGUID = '{...}'
OR StoreGUID = '{...}'
我尝试在游标内使用另一个游标,但FETCH_STATUS发生了冲突。
问题2 有没有人能想到更好的方法?
脚注:
° SQL Server 2000
‡ 受关系数据库中使用唯一标识符的约束限制。