SQL Server：搜索所有表中的特定 GUID

我发现需要清理一些数据，并且我需要找到一些特定的指南（即唯一标识符）在 SQL Server°。

我想出了一个存储过程SELECT从当前数据库中每个表的每个 uniqueidentifier 列中查找，如果找到 guid，则返回一个结果集。

它使用 INFORMATION_SCHEMA 视图来查找所有唯一标识符全部列基表（与视图相对）。对于每一列，它发出一个选择，返回表的名称和找到它的列。

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
任何人都可以找到一种方法来更改它以执行对同一个表中的多个 uniqueidentifier 列的 OR 搜索，而不是单独的查询

i.e.

SELECT ... FROM Prices WHERE BookGUID = '{...}'
SELECT ... FROM Prices WHERE AuthorGUID = '{...}'
SELECT ... FROM Prices WHERE PublisherGUID = '{...}'
SELECT ... FROM Prices WHERE StoreGUID = '{...}'

会成为：

SELECT ... 
FROM Prices 
WHERE BookGUID = '{...}'
OR AuthorGUID = '{...}'
OR PublisherGUID = '{...}'
OR StoreGUID = '{...}'

我尝试在游标内使用游标，但是FETCH_STATUS的冲突。

问题2谁能想到更好的方法吗？‡

脚注：

° SQL Server 2000

‡ 受到在关系数据库中使用唯一标识符的约束。

您可以推迟执行，直到光标循环完成。然后，只需跟踪循环内的表名称，如果相同，则添加一个 OR，否则结束 SELECT 并开始新的 SELECT。

DECLARE @lasttable varchar(255);
SET @lasttable='';
FETCH NEXT FROM abc INTO @tableName, @columnName;
WHILE (@@FETCH_STATUS = 0)
BEGIN
   IF(@lasttable=@tablename) BEGIN
       SET @szQuery = @szQuery + ' OR [' + @columnName + ']=''' + CAST(@searchValue AS varchar(50)) + '''';
   END ELSE BEGIN
       SET @lasttable = @tablename;
       SET @szQuery = @szQuery + 
         'SELECT '''+@tableName+''' AS TheTable, '''+@columnName+''' AS TheColumn '+
         'FROM '+@tableName+' '+
         'WHERE '+@columnName+' = '''+CAST(@searchValue AS varchar(50))+''''
   END
   FETCH NEXT FROM abc INTO @tableName, @columnName;
END
PRINT @szQuery;
EXEC (@szQuery);

您还可以创建存储过程来构建一个 VIEW，该 VIEW 对所有表和 uniqueidentifier 字段执行 UNION ALL。具有这样的架构的东西：

CREATE VIEW all_uuids AS (
    SELECT 'prices' AS tablename, 'BookGUID' as fieldname, ID as primarykey, BookGUID AS guid FROM prices
    UNION ALL SELECT 'prices', 'AuthorGUID', ID, AuthorGUID FROM prices
    UNION ALL SELECT 'othertable', 'otherfield', ID, otherfield FROM othertable
    )

然后，您只需在此可重用的 VIEW 上执行单个 SELECT 语句即可获取所有匹配的 GUID。要在单个表中搜索，请使用相关子查询，例如：

SELECT * FROM prices WHERE EXISTS (SELECT null FROM all_uuids u WHERE u.primarykey=prices.id AND u.guid=@searchfor AND u.tablename='prices')

这将搜索价格表中的所有 GUID 字段。 SQL Server 足够智能，不会查找其他表，而是使用现有表的索引。

通过重用单个视图，您只需在更改架构时循环访问 information_schema，而不是每次查询，并且视图的结果比存储过程的结果更容易连接。

Answer

原始海报最终解决方案基于此答案：

CREATE PROCEDURE dbo.FindGUID @searchValue uniqueidentifier AS

/*
    Search all tables in the database for a guid

    Revision History
    6/9/2009: Initally created
    6/10/2009: Build or clause of multiple columns on one table
*/

--DECLARE @searchValue uniqueidentifier
--SET @searchValue = '{2A6814B9-8261-452D-A144-13264433864E}'

DECLARE abc CURSOR FOR
    SELECT 
        c.TABLE_SCHEMA, 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 @tableSchema varchar(200)
DECLARE @tableName varchar(200)
DECLARE @columnName varchar(200)
DECLARE @szQuery varchar(8000)
SET @szQuery = ''

DECLARE @lasttable varchar(255);
SET @lasttable='';

OPEN ABC

FETCH NEXT FROM abc INTO @tableSchema, @tableName, @columnName;
WHILE (@@FETCH_STATUS = 0)
BEGIN
   IF(@lasttable=@tablename) 
   BEGIN
      SET @szQuery = @szQuery + ' OR [' + @columnName + ']=''' + CAST(@searchValue AS varchar(50)) + '''';
   END 
   ELSE 
   BEGIN
       SET @lasttable = @tablename;

       IF @szQuery <> '' 
       BEGIN
          PRINT @szQuery
          EXEC ('IF EXISTS (' + @szQuery + ') BEGIN ' + @szQuery + ' END');
       END

       SET @szQuery = 
         'SELECT '''+@tableSchema+'.'+@tableName+''' AS TheTable, '''+@columnName+''' AS TheColumn '+
         'FROM '+@tableName+' '+
         'WHERE '+@columnName+' = '''+CAST(@searchValue AS varchar(50))+''''
   END
   FETCH NEXT FROM abc INTO @tableSchema, @tableName, @columnName;
END

CLOSE abc
DEALLOCATE abc

IF @szQuery <> '' 
BEGIN
    PRINT @szQuery
    EXEC ('IF EXISTS (' + @szQuery + ') BEGIN ' + @szQuery + ' END');
END
GO