SQL Server:搜索所有表以查找特定GUID

Question

我想要清理一些数据,我需要在SQL Server°中找到一些特定的guids(即uniqueidentifiers).

我想出了一个存储过程,它从当前数据库中每个表的每个uniqueidentifier列执行SELECT,并在找到guid时返回结果集.

它使用INFORMATION_SCHEMA视图查找所有基表中的所有uniqueidentifier列(与视图相对).对于每个列,它会发出一个select,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
是否有人可以找到一种方法来更改它以在与OR相同的表中搜索多个uniqueidentifier列,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 = '{...}'

会成为:

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

我尝试在游标中使用游标,但FETCH_STATUS发生了冲突.

问题2 有人能想到更好的方法吗？‡

---

脚注:

°SQL Server 2000

‡受限于在关系数据库中使用uniqueidentifier.

Answer 1

您可以推迟EXEC直到光标循环完成.然后,只需跟踪循环中的表名,如果相同,则添加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,它执行所有表和uniqueidentifier字段的UNION ALL.像这样的架构的东西:

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上执行单个SELECT语句以获取所有匹配的GUID.要在单个表中进行搜索,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非常智能,无法查看其他表,它使用现有表的索引.

通过重用单个视图,您只需在更改模式时循环访问information_schema,而不是每次查询,并且视图的结果可以比存储过程的结果更容易连接.

回答

原始海报最终解决方案,基于这个答案:

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

Answer 2

您可以将all包装到单个SELECT中并一次搜索所有表:

ALTER PROCEDURE dbo.FindGUID @searchValue uniqueidentifier AS
BEGIN
SET NOCOUNT ON;
DECLARE @sql NVARCHAR(MAX);
WITH cte_all_tables(SQL) AS (
    SELECT N'SELECT ''' + QUOTENAME(t.TABLE_SCHEMA) + '.' +QUOTENAME(t.TABLE_NAME) + 
        + N''' FROM ' + QUOTENAME(t.TABLE_SCHEMA) + '.' +QUOTENAME(t.TABLE_NAME)
        + N' WHERE ' +
        (
            SELECT QUOTENAME(c.COLUMN_NAME) + N'= @searchValue OR '
            FROM INFORMATION_SCHEMA.Columns c
            WHERE c.TABLE_NAME = t.TABLE_NAME
                AND c.TABLE_SCHEMA = t.TABLE_SCHEMA
                AND c.DATA_TYPE = 'uniqueidentifier'
            FOR XML PATH('')
        ) + N' 0=1 ' 
   FROM INFORMATION_SCHEMA.Columns c
        INNER JOIN INFORMATION_SCHEMA.Tables t
        ON c.TABLE_NAME = t.TABLE_NAME
        AND t.TABLE_SCHEMA = c.TABLE_SCHEMA
        AND t.TABLE_TYPE = 'BASE TABLE'
    WHERE DATA_TYPE = 'uniqueidentifier')
SELECT @sql = (SELECT [SQL] + N' UNION ALL ' FROM cte_all_tables
FOR XML PATH('')) + N' SELECT NULL WHERE 0=1';
PRINT @SQL;
exec sp_executesql @sql, N'@searchValue uniqueidentifier', @searchValue;
END

我使用像'OR 0 = 1'这样的墓碑终结器甚至是整个UNION,但这只是因为我懒得从构建的连接字符串中修剪结尾.

Answer 3

这是 SQL 2000 的解决方案，无偿使用游标：

declare @searchvalue uniqueidentifier
set @searchValue = '{2A6814B9-8261-452D-A144-13264433864E}'

if object_id('tempdb..#results') is not null drop table #results
create table #results (TableSchema sysname, TableName sysname)

declare @sql nvarchar(4000)

declare @cursor1 cursor
declare @tablename sysname
declare @tableschema sysname

declare @cursor2 cursor
declare @columnname sysname
declare @searchFields nvarchar(4000)

set @cursor1 = cursor for
  select t.TABLE_SCHEMA, t.TABLE_NAME
  from INFORMATION_SCHEMA.Tables t
  where t.TABLE_TYPE = 'BASE TABLE'
    and exists (
      select * from INFORMATION_SCHEMA.Columns c
      where c.TABLE_NAME = t.TABLE_NAME
        and c.TABLE_SCHEMA = t.TABLE_SCHEMA
        and c.DATA_TYPE = 'uniqueidentifier'
      )

open @cursor1
while 1=1 begin
  fetch next from @cursor1 into @tableschema, @tablename
  if @@fetch_status <> 0 break

  set @searchFields = ''
  set @cursor2 = cursor for 
    select c.COLUMN_NAME
    from INFORMATION_SCHEMA.Columns c
    where c.TABLE_NAME = @tablename
      and c.TABLE_SCHEMA = @tableschema
      and c.DATA_TYPE = 'uniqueidentifier'

  open @cursor2
  while 1=1 begin
    fetch next from @cursor2 into @columnname
    if @@fetch_status <> 0 break
    set @searchFields = @searchFields + ', ' + quotename(@columnname)
  end      

  set @searchFields = substring(@searchFields,3,len(@searchFields))
  set @sql = ' insert #results'
           + ' select '''+@tableschema+''','''+@tablename+''''
           + ' from '+quotename(@tableschema)+'.'+quotename(@tablename)
           + ' where @searchValue in ('+@searchFields+')'

  print @sql
  exec sp_executesql @sql, N'@searchValue uniqueidentifier', @searchValue
end

select * from #results

这是 SQL 2005 的解决方案，基于 Remus 的解决方案，带有临时表以实现更好的扩展：

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

IF OBJECT_ID('tempdb..#results') IS NOT NULL DROP TABLE #results
CREATE TABLE #results (TableSchema SYSNAME, TableName SYSNAME);
DECLARE @sql NVARCHAR(MAX);
WITH cte_all_tables(SQL) AS (
    SELECT
          N' INSERT #results (TableSchema, TableName)'
        + N' SELECT ''' + t.TABLE_SCHEMA + ''', ''' + t.TABLE_NAME + N'''' 
        + N' FROM ' + QUOTENAME(t.TABLE_SCHEMA) + '.' +QUOTENAME(t.TABLE_NAME)
        + N' WHERE ' +
        (
                SELECT QUOTENAME(c.COLUMN_NAME) + N' = @searchValue OR '
                FROM INFORMATION_SCHEMA.Columns c
                WHERE c.TABLE_NAME = t.TABLE_NAME
                        AND c.TABLE_SCHEMA = t.TABLE_SCHEMA
                        AND c.DATA_TYPE = 'uniqueidentifier'
                FOR XML PATH('')
        ) + N'0=1'
   FROM INFORMATION_SCHEMA.Columns c
        INNER JOIN INFORMATION_SCHEMA.Tables t
        ON c.TABLE_NAME = t.TABLE_NAME
        AND t.TABLE_SCHEMA = c.TABLE_SCHEMA
        AND t.TABLE_TYPE = 'BASE TABLE'
    WHERE DATA_TYPE = 'uniqueidentifier')
SELECT @sql = (SELECT [SQL]+nchar(10) FROM cte_all_tables FOR XML PATH(''));

PRINT @SQL;
exec sp_executesql @sql, N'@searchValue uniqueidentifier', @searchValue;
SELECT * FROM #results