我想要一个脚本来删除名称以给定字符串开头的所有表。我确信这可以用一些动态的sql和INFORMATION_SCHEMA
表来完成。
如果有人有脚本,或者可以快速敲门,请发布。
如果在我弄清楚之前没有人发布答案,我会发布我的解决方案。
如果数据库中有多个查询,则可能需要修改查询以包含所有者。
DECLARE @cmd varchar(4000)
DECLARE cmds CURSOR FOR
SELECT 'drop table [' + Table_Name + ']'
FROM INFORMATION_SCHEMA.TABLES
WHERE Table_Name LIKE 'prefix%'
OPEN cmds
WHILE 1 = 1
BEGIN
FETCH cmds INTO @cmd
IF @@fetch_status != 0 BREAK
EXEC(@cmd)
END
CLOSE cmds;
DEALLOCATE cmds
这比使用生成脚本和运行的两步方法更清晰。但是脚本生成的一个优点是它使您有机会在实际运行之前查看将要运行的全部内容。
我知道如果我打算对生产数据库这样做,我会尽可能小心。
编辑代码示例已修复。
谢谢Curt,这就是我在自己中途的那种解决方案。
你的比我更好 - 它有助于简单修改。我在选择中添加了一个联合并删除了一些视图;)
declare @cmd varchar(4000)
declare cmds cursor for
Select 'drop table [' + Table_Name + ']'
From INFORMATION_SCHEMA.TABLES
Where Table_Name like 'prefix%'
union
Select 'drop view [' + Table_Name + ']'
From INFORMATION_SCHEMA.VIEWS
Where Table_Name like 'prefix%'
open cmds
while 1=1
begin
fetch cmds into @cmd
if @@fetch_status != 0 break
exec(@cmd)
end
close local
deallocate local
别担心,它不是一个生产数据库 - 这只是为了在我尝试填充时轻松清理我的dev db。
select 'DROP TABLE ' + name from sysobjects
where type = 'U' and sysobjects.name like '%test%'
- Test是表名
SELECT 'if object_id(''' + TABLE_NAME + ''') is not null begin drop table "' + TABLE_NAME + '" end;'
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE '[prefix]%'
我不得不对Xenph Yan的答案做一点推理,我怀疑因为我的表没有默认架构。
SELECT 'DROP TABLE Databasename.schema.' + TABLE_NAME
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE 'strmatch%'
如果是临时表,您可能想尝试一下
SELECT 'DROP TABLE "' + t.name + '"'
FROM tempdb.sys.tables t
WHERE t.name LIKE '[prefix]%'
SELECT 'DROP TABLE "' + TABLE_NAME + '"'
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE '[prefix]%'
这将生成一个脚本。
删除前添加子句以检查表的存在:
SELECT 'IF OBJECT_ID(''' +TABLE_NAME + ''') IS NOT NULL BEGIN DROP TABLE [' + TABLE_NAME + '] END;'
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE '[prefix]%'
这将以外键顺序获取表,并避免删除SQL Server创建的一些表。 t.Ordinal
值将表格切割为依赖层。
WITH TablesCTE(SchemaName, TableName, TableID, Ordinal) AS
(
SELECT OBJECT_SCHEMA_NAME(so.object_id) AS SchemaName,
OBJECT_NAME(so.object_id) AS TableName,
so.object_id AS TableID,
0 AS Ordinal
FROM sys.objects AS so
WHERE so.type = 'U'
AND so.is_ms_Shipped = 0
AND OBJECT_NAME(so.object_id)
LIKE 'MyPrefix%'
UNION ALL
SELECT OBJECT_SCHEMA_NAME(so.object_id) AS SchemaName,
OBJECT_NAME(so.object_id) AS TableName,
so.object_id AS TableID,
tt.Ordinal + 1 AS Ordinal
FROM sys.objects AS so
INNER JOIN sys.foreign_keys AS f
ON f.parent_object_id = so.object_id
AND f.parent_object_id != f.referenced_object_id
INNER JOIN TablesCTE AS tt
ON f.referenced_object_id = tt.TableID
WHERE so.type = 'U'
AND so.is_ms_Shipped = 0
AND OBJECT_NAME(so.object_id)
LIKE 'MyPrefix%'
)
SELECT DISTINCT t.Ordinal, t.SchemaName, t.TableName, t.TableID
FROM TablesCTE AS t
INNER JOIN
(
SELECT
itt.SchemaName AS SchemaName,
itt.TableName AS TableName,
itt.TableID AS TableID,
Max(itt.Ordinal) AS Ordinal
FROM TablesCTE AS itt
GROUP BY itt.SchemaName, itt.TableName, itt.TableID
) AS tt
ON t.TableID = tt.TableID
AND t.Ordinal = tt.Ordinal
ORDER BY t.Ordinal DESC, t.TableName ASC
在Oracle XE上,这有效:
SELECT 'DROP TABLE "' || TABLE_NAME || '";'
FROM USER_TABLES
WHERE TABLE_NAME LIKE 'YOURTABLEPREFIX%'
或者,如果您想要删除约束并释放空间,请使用以下命令:
SELECT 'DROP TABLE "' || TABLE_NAME || '" cascade constraints PURGE;'
FROM USER_TABLES
WHERE TABLE_NAME LIKE 'YOURTABLEPREFIX%'
这会产生一堆DROP TABLE cascade constraints PURGE
声明......
对于VIEWS
使用此:
SELECT 'DROP VIEW "' || VIEW_NAME || '";'
FROM USER_VIEWS
WHERE VIEW_NAME LIKE 'YOURVIEWPREFIX%'
EXEC sp_MSforeachtable 'if PARSENAME("?",1) like ''%CertainString%'' DROP TABLE ?'
编辑:
sp_MSforeachtable未记录,因此不适合生产,因为它的行为可能因MS_SQL版本而异。
CREATE PROCEDURE usp_GenerateDROP
@Pattern AS varchar(255)
,@PrintQuery AS bit
,@ExecQuery AS bit
AS
BEGIN
DECLARE @sql AS varchar(max)
SELECT @sql = COALESCE(@sql, '') + 'DROP TABLE [' + TABLE_NAME + ']' + CHAR(13) + CHAR(10)
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE @Pattern
IF @PrintQuery = 1 PRINT @sql
IF @ExecQuery = 1 EXEC (@sql)
END
当我在寻找mysql语句来删除基于@Xenph Yan的所有WordPress表时,我看到了这篇文章,这是我最终做的:
SELECT CONCAT( 'DROP TABLE `', TABLE_NAME, '`;' ) AS query
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE 'wp_%'
这将为您提供以wp_开头的所有表的drop查询集
这是我的解决方案:
SELECT CONCAT('DROP TABLE `', TABLE_NAME,'`;')
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_NAME LIKE 'TABLE_PREFIX_GOES_HERE%';
当然,您需要用前缀替换TABLE_PREFIX_GOES_HERE
。
Xenph Yan的回答比我的清楚得多,但这里我的一切都是一样的。
DECLARE @startStr AS Varchar (20)
SET @startStr = 'tableName'
DECLARE @startStrLen AS int
SELECT @startStrLen = LEN(@startStr)
SELECT 'DROP TABLE ' + name FROM sysobjects
WHERE type = 'U' AND LEFT(name, @startStrLen) = @startStr
只需将tableName
更改为您要搜索的字符即可。