Question

我试图从服务器上的大多数数据库中删除特定视图。粘贴在下面是我现在拥有的。它成功完成但实际上并没有删除视图。

我错过了什么，为什么不是错误而不是实际上放弃了视图？此外，当我在特定数据库中运行exec语句时，它会删除视图。

USE [Master]

DECLARE @DBname    VARCHAR (128);
DECLARE @NumDBs    INT;
DECLARE @Count     INT = 0;


DECLARE getDBs CURSOR
FOR 
SELECT name 
FROM sys.databases
WHERE name NOT IN ('DBName1','DBName2')
ORDER BY name;

SET @NumDBs = (SELECT COUNT(9) FROM sys.databases WHERE
name NOT IN ('DBName1','DBName2') )
;

OPEN getDBs
FETCH NEXT FROM getDBs
INTO @DBname;

WHILE (@Count < @NumDBs)
BEGIN

Exec('IF  EXISTS (SELECT * 
                  FROM '+@DBname+'.sys.views 
                  WHERE object_id= OBJECT_ID(N''[ViewName]''))                                                    
DROP VIEW [ViewName]'
);

 SET @Count = @Count + 1;

FETCH NEXT FROM getDBs
INTO @DBname;
END;

CLOSE getDBs;
DEALLOCATE getDBs;

Answer 1

    EXECUTE master.sys.sp_MSforeachdb 
'USE [?];if db_id()>4 and db_name() not in (''somedb'',''somedb1'') drop view viewname;'

Answer 2

Powershell救援！

push-location;
import-module sqlps -disablenamechecking;
pop-location;

$s = new-object microsoft.sqlserver.management.smo.server 'yourServer';
foreach ($db in $s.Databases | where {$_.IsAccessible -eq $true}) {
    $v = $db.Views['ViewName'];
    if ($v -ne $null) {
        $v.Drop();
    }
}

Answer 3

Exec('USE ' +@DBname+'; IF  EXISTS (SELECT * 
                  FROM sys.views 
                  WHERE object_id= OBJECT_ID(N''[ViewName]''))                                                    
DROP VIEW [ViewName]'
);

Answer 4

我将原来的EXEC语句替换为下面粘贴的，并且所有语句都按照我需要的方式工作。

Exec( 
    'Use ['+@DBName+'] ;
     IF  EXISTS (SELECT * FROM '+@DBname+'.sys.views WHERE object_id = OBJECT_ID(N''[ViewName]''))
        DROP VIEW [ViewName]'
    );

Answer 5

几乎所有东西都适合您的数据库。除了我不会在那里使用光标，因为它绝对是多余的，尝试不惜任何代价避免它们并开始考虑基于行集的逻辑。

您可以像这样动态构建查询：

DECLARE @SQL NVARCHAR(MAX) = N'';

SELECT @SQL += N'
    USE ' + QUOTENAME([name]) + ';
    IF OBJECT_ID(''[ViewName]'', ''V'') IS NOT NULL
        DROP VIEW [ViewName];'
FROM sys.databases
WHERE [name] NOT IN ('DBName1','DBName2')
ORDER BY [name];

EXEC sys.sp_executesql @SQL;

在我的本地实例上，它会生成这样的查询：

USE [AdventureWorks2014];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];
USE [master];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];
USE [model];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];
USE [msdb];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];
USE [ReportServer];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];
USE [ReportServerTempDB];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];
USE [tempdb];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];
USE [test];
IF OBJECT_ID('[ViewName]', 'V') IS NOT NULL
    DROP VIEW [ViewName];

总体而言，@TheGameiswar建议的解决方案是最好的解决方案，它使用sys.sp_MSforeachdb，这是针对此类用例创建的。

如何从服务器上的所有数据库中删除视图

5 个答案: