Question

有人必须已经编写了一个脚本来删除数据库所有表中的所有行。使用DELETE命令不是一个选项，因为在大型表上可能需要很长时间。当然，stackoverflow和其他地方有很多例子，但它们不适用于使用外键的表。

基本上，脚本应该这样做：

将所有外键定义存储在临时表中
删除所有外键
截断所有表格
恢复外键

我想我拥有它：

IF OBJECT_ID('tempdb..#ForeignKeys') IS NOT NULL
    DROP TABLE #ForeignKeys;

WITH ForeignKeys AS (
SELECT
    QUOTENAME(SCHEMA_NAME(t.schema_id)) + '.' + QUOTENAME(t.name) AS ParentTable
    , QUOTENAME(SCHEMA_NAME(rt.schema_id)) + '.' + QUOTENAME(rt.name) AS ReferenceTable
    , QUOTENAME(f.name) AS ConstraintName
    , STUFF(Parent.Cols, 1, 1, '') AS ParentColumns
    , STUFF(Reference.Cols, 1, 1, '') AS ReferenceColumns
    , REPLACE(f.update_referential_action_desc, '_', ' ') AS UpdateAction
    , REPLACE(f.delete_referential_action_desc, '_', ' ') AS DeleteAction
FROM
    sys.tables AS t
    LEFT JOIN sys.foreign_keys AS f
        ON f.parent_object_id = t.object_id
        AND f.type = 'F'
    LEFT JOIN sys.tables AS rt
        ON f.referenced_object_id = rt.object_id
    CROSS APPLY
    (
        SELECT
            ',' + QUOTENAME(COL_NAME(fc.parent_object_id, fc.parent_column_id))AS [text()]
        FROM
            sys.foreign_key_columns AS fc
        WHERE
            fc.constraint_object_id = f.object_id
        ORDER BY
            fc.constraint_column_id
        FOR XML PATH('')
    ) Parent(Cols)
    CROSS APPLY
    (
        SELECT
            ',' + QUOTENAME(COL_NAME(fc.referenced_object_id, fc.referenced_column_id)) AS [text()]
        FROM
            sys.foreign_key_columns AS fc
        WHERE
            fc.constraint_object_id = f.object_id
        ORDER BY
            fc.constraint_column_id
        FOR XML PATH('')
    ) Reference(Cols)
)
SELECT
    ParentTable AS TableName
    , 'ALTER TABLE ' + ParentTable + ' DROP CONSTRAINT ' + ConstraintName  AS DropCmd
    , 'TRUNCATE TABLE ' + ParentTable AS TruncateCmd
    , 'ALTER TABLE ' + ParentTable + ' ADD CONSTRAINT ' + ConstraintName + ' FOREIGN KEY('
        +  ParentColumns + ') REFERENCES ' + ReferenceTable + ' (' + ReferenceColumns 
        + ') ON UPDATE ' + UpdateAction 
        + ' ON DELETE ' + DeleteAction  COLLATE SQL_Latin1_General_CP1_CI_AS AS CreateCmd
INTO
    #ForeignKeys
FROM
    ForeignKeys
ORDER BY
 1;

-- SELECT * FROM #ForeignKeys

DECLARE @TableName SYSNAME
DECLARE @Sql NVARCHAR(MAX)

-- Drop all constraints
DECLARE FkCursor CURSOR FOR 
SELECT
    TableName
    , DropCmd
FROM
    #ForeignKeys
WHERE
    DropCmd IS NOT NULL     

OPEN FkCursor  
FETCH NEXT FROM FkCursor INTO @TableName, @Sql
WHILE @@FETCH_STATUS = 0  
BEGIN  
    PRINT @TableName + ' : ' + @sql
    EXEC sp_executesql @Sql
    FETCH NEXT FROM FkCursor INTO @TableName, @Sql
END
CLOSE FkCursor
DEALLOCATE FkCursor

-- Truncate all tables
DECLARE FkCursor CURSOR FOR 
SELECT
    TableName
    , TruncateCmd
FROM
    #ForeignKeys     

OPEN FkCursor  

FETCH NEXT FROM FkCursor INTO @TableName, @Sql
WHILE @@FETCH_STATUS = 0  
BEGIN  
    PRINT @TableName + ' : ' + @sql
    EXEC sp_executesql @Sql
    FETCH NEXT FROM FkCursor INTO @TableName, @Sql
END
CLOSE FkCursor
DEALLOCATE FkCursor

-- Create all foreign keys
DECLARE FkCursor CURSOR FOR 
SELECT
    TableName
    , CreateCmd
FROM
    #ForeignKeys
WHERE
    CreateCmd IS NOT NULL      

OPEN FkCursor  
FETCH NEXT FROM FkCursor INTO @TableName, @Sql
WHILE @@FETCH_STATUS = 0  
BEGIN  
    PRINT @TableName + ' : ' + @sql
    EXEC sp_executesql @Sql
    FETCH NEXT FROM FkCursor INTO @TableName, @Sql
END
CLOSE FkCursor
DEALLOCATE FkCursor

DROP TABLE #ForeignKeys;

Answer 1

DECLARE @drop NVARCHAR(MAX), @truncate NVARCHAR(MAX), @create NVARCHAR(MAX);

SELECT @drop = N'', @truncate = N'', @create = N'';

;WITH x AS
(
    SELECT id = f.[object_id],
      cname = QUOTENAME(f.name),
      ctable = QUOTENAME(OBJECT_SCHEMA_NAME(f.parent_object_id)) 
        + '.' + QUOTENAME(OBJECT_NAME(f.parent_object_id)),
      ccol = QUOTENAME(COL_NAME(fc.parent_object_id,fc.parent_column_id)),
      rtable = QUOTENAME(OBJECT_SCHEMA_NAME(f.referenced_object_id))
        + '.' + QUOTENAME(OBJECT_NAME(f.referenced_object_id)),
      rcol = QUOTENAME(COL_NAME(fc.referenced_object_id,fc.referenced_column_id)),
      ou = f.update_referential_action_desc COLLATE SQL_Latin1_General_CP1_CI_AS,
      od = f.delete_referential_action_desc COLLATE SQL_Latin1_General_CP1_CI_AS
    FROM sys.foreign_keys AS f
    INNER JOIN sys.foreign_key_columns AS fc
    ON f.[object_id] = fc.constraint_object_id
    -- where clause to leave out certain tables here
),
y AS
(
  SELECT 
    d = CHAR(13) + CHAR(10) + 'ALTER TABLE ' + ctable + ' DROP CONSTRAINT ' + cname + ';',
    c = CHAR(13) + CHAR(10) + 'ALTER TABLE ' + ctable + ' ADD CONSTRAINT ' + cname 
      + ' FOREIGN KEY (' + STUFF((SELECT ',' + ccol FROM x AS x2 
        WHERE x2.id = x.id FOR XML PATH('')), 1, 1, '')
      + ') REFERENCES ' + rtable + '(' + STUFF((SELECT ',' + rcol FROM x AS x3 
        WHERE x3.id = x.id FOR XML PATH('')), 1, 1, '') + ')'
    + CASE WHEN od <> 'NO_ACTION' THEN 
      ' ON DELETE ' + REPLACE(od, 'SET_', 'SET ') ELSE '' END
    + CASE WHEN ou <> 'NO_ACTION' THEN 
      ' ON UPDATE ' + REPLACE(ou, 'SET_', 'SET ') ELSE '' END
  FROM x
)
SELECT 
  @drop = @drop + d, 
  @create = @create + c
FROM y GROUP BY d,c;

SELECT @truncate = @truncate + CHAR(13) + CHAR(10) + 'TRUNCATE TABLE ' 
  + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' + QUOTENAME(name) + ';'
  FROM sys.tables
  -- where clause to leave out certain tables here
;

-- use results to text. Note that for 200 tables you won't be able to
-- manually inspect the entire script in Management Studio because it
-- will only show a certain number of characters depending on settings.

SELECT @drop;
SELECT @truncate;
SELECT @create;

-- when you are happy, uncomment these:

--EXEC sp_executesql @drop;
--EXEC sp_executesql @truncate;
--EXEC sp_executesql @create;

Answer 2

右键单击对象（在对象资源管理器中），然后单击脚本作为 - ＆gt;下降到。使用相同的方法和脚本 - ＆gt;创建到。这应该为您提供Dropping脚本以及创建数据库中的所有对象。按照您喜欢的顺序运行它们。

或者如果你有很多表和对象，你可以右键单击数据库 - ＆gt;转到任务并单击Generate Scripts。 enter image description here

从数据库的所有表中删除所有行

2 个答案: