SQL TRUNCATE DATABASE？如何截断所有表格

Question

SQL TRUNCATE DATABASE？如何截断所有表格

use*_*511 30 database truncate sql-server-2008

我使用SQL Server 2008 R2.

是否有一个SQL命令来清空数据库,而不是必须截断所有20个表？

我只想删除数据而不是结构.

Answer 1

Mar*_*sen 42

您可以像这样使用sp_MSforeachtable存储过程:

USE MyDatabase
EXEC sp_MSforeachtable 'TRUNCATE TABLE ?'

Run Code Online (Sandbox Code Playgroud)

请注意,这将删除(通过截断)所有用户表中的所有数据.如果由于外键等原因你不能TRUNCATE,你可以像删除一样运行:

USE MyDatabase
EXEC sp_MSforeachtable 'DELETE FROM ?'

Run Code Online (Sandbox Code Playgroud)

如果任何表具有外键,这将不起作用.这些将需要删除并重新创建(不禁用/启用) (4认同)
@Martin我同时在你的评论中添加了这个信息:)尽管你是对的,你需要以正确的顺序删除,除非有级联更新/删除.否则,如你所述,他们必须事先被禁用. (2认同)
@cairnz这不是一个非常好的长期解决方案.如果您尝试自动执行此过程,您可能永远不知道它需要提前运行多少次.为此,Boycs的答案更加有效,因为它会禁用您的外键,清空表,然后重新启用它们. (2认同)

Answer 2

Boy*_*ycs 36

我用这个脚本

EXEC sp_MSForEachTable ‘ALTER TABLE ? NOCHECK CONSTRAINT ALL’
EXEC sp_MSForEachTable ‘DELETE FROM ?’
EXEC sp_MSForEachTable ‘ALTER TABLE ? CHECK CONSTRAINT ALL’
GO

Run Code Online (Sandbox Code Playgroud)

爱它.这很棒.我只会添加一个调用`dbcc checkident(？,RESEED,1)`来重置身份(对于那些有身份的表). (9认同)

Answer 3

Cha*_*nya 5

当你有外键关系时,接受的答案并不常用.在这种情况下,您必须删除约束并重新创建它们.以下是基于此处答案的存储过程

CREATE PROCEDURE [dbo].[deleteAllDataFromAllTables] AS
SET NOCOUNT ON

    DECLARE @dropAndCreateConstraintsTable TABLE ( DropStmt varchar(max) , CreateStmt varchar(max) )

    insert @dropAndCreateConstraintsTable select
      DropStmt = 'ALTER TABLE [' + ForeignKeys.ForeignTableSchema + 
          '].[' + ForeignKeys.ForeignTableName + 
          '] DROP CONSTRAINT [' + ForeignKeys.ForeignKeyName + ']; '
    ,  CreateStmt = 'ALTER TABLE [' + ForeignKeys.ForeignTableSchema + 
          '].[' + ForeignKeys.ForeignTableName + 
          '] WITH CHECK ADD CONSTRAINT [' +  ForeignKeys.ForeignKeyName + 
          '] FOREIGN KEY([' + ForeignKeys.ForeignTableColumn + 
          ']) REFERENCES [' + schema_name(sys.objects.schema_id) + '].[' +
      sys.objects.[name] + ']([' +
      sys.columns.[name] + ']); '
     from sys.objects
      inner join sys.columns
        on (sys.columns.[object_id] = sys.objects.[object_id])
      inner join (
        select sys.foreign_keys.[name] as ForeignKeyName
         ,schema_name(sys.objects.schema_id) as ForeignTableSchema
         ,sys.objects.[name] as ForeignTableName
         ,sys.columns.[name]  as ForeignTableColumn
         ,sys.foreign_keys.referenced_object_id as referenced_object_id
         ,sys.foreign_key_columns.referenced_column_id as referenced_column_id
         from sys.foreign_keys
          inner join sys.foreign_key_columns
            on (sys.foreign_key_columns.constraint_object_id
              = sys.foreign_keys.[object_id])
          inner join sys.objects
            on (sys.objects.[object_id]
              = sys.foreign_keys.parent_object_id)
            inner join sys.columns
              on (sys.columns.[object_id]
                = sys.objects.[object_id])
               and (sys.columns.column_id
                = sys.foreign_key_columns.parent_column_id)
        ) ForeignKeys
        on (ForeignKeys.referenced_object_id = sys.objects.[object_id])
         and (ForeignKeys.referenced_column_id = sys.columns.column_id)
     where (sys.objects.[type] = 'U')
      and (sys.objects.[name] not in ('sysdiagrams'))


    DECLARE @DropStatement nvarchar(max)
    DECLARE @RecreateStatement nvarchar(max)

    DECLARE C1 CURSOR READ_ONLY
    FOR
    SELECT DropStmt from @dropAndCreateConstraintsTable
    OPEN C1

    FETCH NEXT FROM C1 INTO @DropStatement

    WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT 'Executing ' + @DropStatement
        execute sp_executesql @DropStatement
        FETCH NEXT FROM C1 INTO @DropStatement
    END
    CLOSE C1
    DEALLOCATE C1

    DECLARE @DeleteTableStatement nvarchar(max)
    DECLARE C2 CURSOR READ_ONLY
    FOR
    SELECT 'Delete From [dbo].[' + TABLE_NAME + ']' from INFORMATION_SCHEMA.TABLES 
        WHERE TABLE_SCHEMA = 'dbo' -- Change your schema appropriately.
    OPEN C2

    FETCH NEXT FROM C2 INTO @DeleteTableStatement

    WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT 'Executing ' + @DeleteTableStatement
        execute sp_executesql @DeleteTableStatement
        FETCH NEXT FROM C2 INTO  @DeleteTableStatement
    END
    CLOSE C2
    DEALLOCATE C2

    DECLARE C3 CURSOR READ_ONLY
    FOR
    SELECT CreateStmt from @dropAndCreateConstraintsTable
    OPEN C3

    FETCH NEXT FROM C3 INTO @RecreateStatement

    WHILE @@FETCH_STATUS = 0
    BEGIN
        PRINT 'Executing ' + @RecreateStatement
        execute sp_executesql @RecreateStatement
        FETCH NEXT FROM C3 INTO  @RecreateStatement
    END
    CLOSE C3
    DEALLOCATE C3

GO

Run Code Online (Sandbox Code Playgroud)

Answer 4

Dav*_*ett 5

提供的大多数解决方案要么不使用与DELETE不同的TRUNCATE，要么不处理外键约束问题。Chaitanya提供的解决方案很接近，但是它只能使用DELETE，并且可以在存储过程中完成，这似乎不适合您在数据库中处理所有数据的情况。

因此，以下是我的变体，它使用TRUNCATE并解决了外键约束问题。

    /* TRUNCATE ALL TABLES IN A DATABASE */

DECLARE @dropAndCreateConstraintsTable TABLE
        (
         DropStmt VARCHAR(MAX)
        ,CreateStmt VARCHAR(MAX)
        )
/* Gather information to drop and then recreate the current foreign key constraints  */
INSERT  @dropAndCreateConstraintsTable
        SELECT  DropStmt = 'ALTER TABLE [' + ForeignKeys.ForeignTableSchema
                + '].[' + ForeignKeys.ForeignTableName + '] DROP CONSTRAINT ['
                + ForeignKeys.ForeignKeyName + ']; '
               ,CreateStmt = 'ALTER TABLE [' + ForeignKeys.ForeignTableSchema
                + '].[' + ForeignKeys.ForeignTableName
                + '] WITH CHECK ADD CONSTRAINT [' + ForeignKeys.ForeignKeyName
                + '] FOREIGN KEY([' + ForeignKeys.ForeignTableColumn
                + ']) REFERENCES [' + SCHEMA_NAME(sys.objects.schema_id)
                + '].[' + sys.objects.[name] + ']([' + sys.columns.[name]
                + ']); '
        FROM    sys.objects
        INNER JOIN sys.columns
                ON ( sys.columns.[object_id] = sys.objects.[object_id] )
        INNER JOIN ( SELECT sys.foreign_keys.[name] AS ForeignKeyName
                           ,SCHEMA_NAME(sys.objects.schema_id) AS ForeignTableSchema
                           ,sys.objects.[name] AS ForeignTableName
                           ,sys.columns.[name] AS ForeignTableColumn
                           ,sys.foreign_keys.referenced_object_id AS referenced_object_id
                           ,sys.foreign_key_columns.referenced_column_id AS referenced_column_id
                     FROM   sys.foreign_keys
                     INNER JOIN sys.foreign_key_columns
                            ON ( sys.foreign_key_columns.constraint_object_id = sys.foreign_keys.[object_id] )
                     INNER JOIN sys.objects
                            ON ( sys.objects.[object_id] = sys.foreign_keys.parent_object_id )
                     INNER JOIN sys.columns
                            ON ( sys.columns.[object_id] = sys.objects.[object_id] )
                               AND ( sys.columns.column_id = sys.foreign_key_columns.parent_column_id )
                   ) ForeignKeys
                ON ( ForeignKeys.referenced_object_id = sys.objects.[object_id] )
                   AND ( ForeignKeys.referenced_column_id = sys.columns.column_id )
        WHERE   ( sys.objects.[type] = 'U' )
                AND ( sys.objects.[name] NOT IN ( 'sysdiagrams' ) )

/* SELECT * FROM @dropAndCreateConstraintsTable AS DACCT */

DECLARE @DropStatement NVARCHAR(MAX)
DECLARE @RecreateStatement NVARCHAR(MAX)

/* Drop Constraints */
DECLARE C1 CURSOR READ_ONLY
FOR
        SELECT  DropStmt
        FROM    @dropAndCreateConstraintsTable
OPEN C1

FETCH NEXT FROM C1 INTO @DropStatement

WHILE @@FETCH_STATUS = 0
      BEGIN
            PRINT 'Executing ' + @DropStatement
            EXECUTE sp_executesql @DropStatement
            FETCH NEXT FROM C1 INTO @DropStatement
      END
CLOSE C1
DEALLOCATE C1

/* Truncate all tables in the database in the dbo schema */
DECLARE @DeleteTableStatement NVARCHAR(MAX)
DECLARE C2 CURSOR READ_ONLY
FOR
        SELECT  'TRUNCATE TABLE [dbo].[' + TABLE_NAME + ']'
        FROM    INFORMATION_SCHEMA.TABLES
        WHERE   TABLE_SCHEMA = 'dbo'
                AND TABLE_TYPE = 'BASE TABLE'
  /* Change your schema appropriately if you don't want to use dbo */
OPEN C2

FETCH NEXT FROM C2 INTO @DeleteTableStatement

WHILE @@FETCH_STATUS = 0
      BEGIN
            PRINT 'Executing ' + @DeleteTableStatement
            EXECUTE sp_executesql @DeleteTableStatement
            FETCH NEXT FROM C2 INTO @DeleteTableStatement
      END
CLOSE C2
DEALLOCATE C2

/* Recreate foreign key constraints  */
DECLARE C3 CURSOR READ_ONLY
FOR
        SELECT  CreateStmt
        FROM    @dropAndCreateConstraintsTable
OPEN C3

FETCH NEXT FROM C3 INTO @RecreateStatement

WHILE @@FETCH_STATUS = 0
      BEGIN
            PRINT 'Executing ' + @RecreateStatement
            EXECUTE sp_executesql @RecreateStatement
            FETCH NEXT FROM C3 INTO @RecreateStatement
      END
CLOSE C3
DEALLOCATE C3

GO

Run Code Online (Sandbox Code Playgroud)

归档时间：	14 年，3 月前
查看次数：	99192 次
最近记录：	6 年，7 月前