データベースのすべてのテーブルからすべての行を削除するスクリプトを誰かがすでに書いているはずです。大きなテーブルでは時間がかかる可能性があるため、DELETE コマンドの使用はオプションではありません。もちろん、stackoverflow などには多くの例がありますが、それらは外部キーを使用するテーブルでは機能しません。
基本的に、スクリプトはこれを行う必要があります：
- すべての外部キー定義を一時テーブルに保存します
- すべての外部キーを削除
- すべてのテーブルを切り捨てる
- 外部キーを復元する
私はそれを持っていると思います：
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;
