SQL Server:在所有表中搜索特定的GUID [英] SQL Server: Search all tables for a particular GUID

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问题描述

我遇到了清理一些数据的需要，并且我需要在SQL Server°中找到一些特殊的指导(即 uniqueidentifiers ).

我想出了一个存储过程，该存储过程将从当前数据库中每个表的每个uniqueidentifier列中进行 SELECT ，并在找到GUID时返回结果集.

它使用INFORMATION_SCHEMA视图在所有基本表中找到所有 uniqueidentifier 列(而不是视图).对于每个列，它都会发出一个选择，并返回表的名称和找到该表的列.

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，以执行与OR相同的表中的多个uniqueidentifier列的搜索，而不是单独的查询

即

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

将成为:

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

我尝试在游标中使用游标，但是 FETCH_STATUS 发生冲突.

问题2 有人能想到更好的方法吗?‡

脚注:

°SQL Server 2000

‡受在关系数据库中使用唯一标识符的约束.

解决方案

您可以将EXEC推迟到光标循环完成之前.然后，只需在循环内跟踪表名，如果相同，则添加一个OR，否则结束SELECT并开始一个新的.

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，您只需要在此可重用的VIEW上执行一个SELECT语句即可获取所有匹配的GUID.要在单个表中进行搜索，请使用相关的子查询，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')

这将在价格表中的所有GUID字段中进行搜索. SQL Server非常聪明，不会浏览其他表，并且使用现有表的索引.

通过重新使用单个视图，您只需在更改模式时就遍历information_schema，而不必与每个查询一起遍历，并且视图的结果比存储过程的结果更容易连接. /p>

答案

基于此答案的原始海报最终解决方案:

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

i came across the need to cleanse some data, and i need to find some particular guids (i.e. uniqueidentifiers) in SQL Server°.

i've come up with a stored procedure that does a SELECT from every uniqueidentifier column in every table in the current database, and returns a result set if the guid is found.

It uses the INFORMATION_SCHEMA views to find all uniqueidentifier columns in all base tables (as opposed to views). For each column it issues a select, returning the name of the table and the column where it was found.

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

My question are:

Question 1
Could anyone figure out a way to change it to perform a search of multiple uniqueidentifier columns in the same table as ORs, rather than separate queries

i.e.

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 = '{...}'

i tried using a cursor inside a cursor, but the FETCH_STATUS's conflict.

Question 2 Can anyone think of any better way to do it?‡

Footnotes:

° SQL Server 2000

‡ Subject to the constraint of using uniqueidentifiers in a relational database.

解决方案

You could defer the EXEC until your cursor loop is done. Then, just track the table name inside your loop and if it's the same, add an OR, otherwise end your SELECT and start a new one.

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);

You could also create the stored procedure to build a VIEW that does a UNION ALL of all tables and uniqueidentifier fields. Something with a schema like this:

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
    )

Then, you just need to perform a single SELECT statement on this reusable VIEW to get all of the matching GUIDs. To search within a single table, use a correlated subquery, e.g.:

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

That will search across all GUID fields in the prices table. SQL Server is smart enough to not go looking through other tables, and it uses your existing tables' indexes.

By re-using a single view, you only have to go looping through information_schema when you change your schema, not with every query, and the results of a view can be joined more readily than the results of a stored procedure.

Answer

Original posters final solution, based on this answer:

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

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