Pro deaktivaci cizích klíčů jsem použil následující dva skripty. Nevytvořil jsem je, našel jsem je na interwebech, ale posledních pár let mi fungovaly perfektně. Bohužel už nemohu najít jejich zdroj.
references_sp.sql je uložená procedura, kterou je třeba vytvořit před spuštěním jiného skriptu.
references_run.sql je skript, který generuje skript pro zakázání/povolení cizích klíčů.
Všimněte si, že je bezpečné spustit zde uvedený skript - nemění databázi (kromě vytváření a následného mazání dočasných tabulek), pouze generuje další skript, který cizí klíče zruší a znovu vytvoří.
A teď skripty.
references_sp.sql:
USE [master]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
/*********************************************************************************************
Copyright SQLServerNation.com
* Author: Tim Chapman
***********************************************************************************************/
CREATE PROCEDURE [dbo].[sp_ShowForeignKeyObjects]
AS
SELECT
OBJECT_NAME(constid) AS ConstraintName,
OBJECT_SCHEMA_NAME(fkeyid) + '.' + OBJECT_NAME(fkeyid) + '.' + COL_NAME(fkeyid, fkey) AS ForeignKeyObject,
OBJECT_SCHEMA_NAME(rkeyid) + '.' + OBJECT_NAME(rkeyid) + '.' + COL_NAME(rkeyid, rkey) AS ReferenceKeyObject,
COL_NAME(fkeyid, fkey) AS ForeignKeyColumn,
COL_NAME(rkeyid, rkey) AS ReferenceKeyColumn,
constid AS ConstraintID,
OBJECT_SCHEMA_NAME(fkeyid) + '.' + OBJECT_NAME(fkeyid) AS ForeignKeyTable,
fkeyid AS ForeignKeyID,
OBJECT_SCHEMA_NAME(rkeyid) + '.' + OBJECT_NAME(rkeyid) AS ReferenceKeyTable,
rkeyid AS ReferenceKeyID,
keyno AS KeySequenceNumber
FROM
sysforeignkeys
ORDER BY
OBJECT_NAME(rkeyid) ASC, COL_NAME(rkeyid, rkey)
GO
references_run.sql:
IF OBJECT_ID('tempdb..#FK')>0
DROP TABLE #FK
IF OBJECT_ID('tempdb..#Const')>0
DROP TABLE #Const
CREATE TABLE #FK
(
ConstraintName VARCHAR(255),
ForeignKeyObject VARCHAR(255),
ReferenceObject VARCHAR(255),
ForeignKeyColumn VARCHAR(255),
ReferenceKeyColumn VARCHAR(255),
ConstraintID INT,
ForeignKeyTable VARCHAR(255),
ForeignKeyID INT,
ReferenceKeyTable VARCHAR(255),
ReferenceKeyID INT,
KeySequenceNumber SMALLINT
)
CREATE TABLE #Const
(
ConstraintID INT,
FBuildField VARCHAR(2000) DEFAULT(''),
RBuildField VARCHAR(2000) DEFAULT(''),
CountField SMALLINT
)
INSERT INTO #FK
EXEC sp_Showforeignkeyobjects
SET NOCOUNT ON
DECLARE tempcursor
CURSOR
READ_ONLY
FOR
SELECT
f.ConstraintName ,
f.ForeignKeyObject ,
f.ReferenceObject ,
f.ForeignKeyColumn ,
f.ReferenceKeyColumn,
f.ConstraintID ,
f.ForeignKeyID ,
f.ReferenceKeyID ,
f.KeySequenceNumber,
f.ForeignKeyTable,
f.ReferenceKeyTable
FROM #FK AS f
INNER JOIN
(
SELECT ConstraintID, MAX(KeySequenceNumber) AS MaxSeq
FROM #FK AS k
GROUP BY k.ConstraintID
)b ON f.ConstraintID = b.ConstraintID AND f.KeySequenceNumber = b.MaxSeq
DECLARE
@ConstraintName VARCHAR(255),
@ForeignKeyObject VARCHAR(255),
@ReferenceObject VARCHAR(255),
@ForeignKeyColumn VARCHAR(255),
@ReferenceKeyColumn VARCHAR(255),
@ConstraintID INT,
@ForeignKeyID INT,
@ReferenceKeyID INT,
@KeySequenceNumber SMALLINT,
@ForeignKeyTable VARCHAR(255),
@ReferenceKeyTable VARCHAR(255)
OPEN tempcursor
FETCH NEXT FROM tempCursor INTO
@ConstraintName ,
@ForeignKeyObject ,
@ReferenceObject ,
@ForeignKeyColumn ,
@ReferenceKeyColumn,
@ConstraintID ,
@ForeignKeyID ,
@ReferenceKeyID,
@KeySequenceNumber,
@ForeignKeyTable ,
@ReferenceKeyTable
WHILE (@@fetch_status <> -1)
BEGIN
DECLARE tempcursor2
CURSOR
READ_ONLY
FOR
SELECT ConstraintID, ForeignKeyColumn, ReferenceKeyColumn, KeySequenceNumber
FROM #FK
WHERE ConstraintID = @ConstraintID
ORDER BY ConstraintID, KeySequenceNumber ASC
DECLARE @ConstraintID2 INT, @ForeignKeyColumn2 VARCHAR(255), @ReferenceKeyColumn2 VARCHAR(255), @KeySequenceNumber2 SMALLINT
DECLARE @FKeyBuildField VARCHAR(1000), @RKeyBuildField VARCHAR(1000), @Cnt SMALLINT
OPEN tempcursor2
SELECT @FKeyBuildField = '', @RKeyBuildField = '', @Cnt = 0
FETCH NEXT FROM tempcursor2 INTO @ConstraintID2 , @ForeignKeyColumn2 , @ReferenceKeyColumn2 , @KeySequenceNumber2
WHILE (@@fetch_status <> -1)
BEGIN
SET @Cnt = @Cnt + 1
SELECT @FKeyBuildField = @FKeyBuildField + ISNULL(@ForeignKeyColumn2,'')+
CASE
WHEN @ForeignKeyColumn2 IS NULL THEN ''
ELSE
CASE WHEN @KeySequenceNumber = @KeySequenceNumber2 THEN '' ELSE ',' END
END
SELECT @RKeyBuildField = @RKeyBuildField + ISNULL(@ReferenceKeyColumn2,'')+
CASE
WHEN @ReferenceKeyColumn2 IS NULL THEN ''
ELSE
CASE WHEN @KeySequenceNumber = @KeySequenceNumber2 THEN '' ELSE ',' END
END
INSERT INTO #Const
(
ConstraintID ,
FBuildField ,
RBuildField,
CountField
)
VALUES
(
@ConstraintID,
@FKeyBuildField,
@RKeyBuildField,
@Cnt
)
FETCH NEXT FROM tempcursor2 INTO @ConstraintID2 , @ForeignKeyColumn2 , @ReferenceKeyColumn2 , @KeySequenceNumber2
END
CLOSE tempcursor2
DEALLOCATE tempcursor2
FETCH NEXT FROM tempCursor INTO
@ConstraintName ,
@ForeignKeyObject ,
@ReferenceObject ,
@ForeignKeyColumn ,
@ReferenceKeyColumn,
@ConstraintID ,
@ForeignKeyID ,
@ReferenceKeyID ,
@KeySequenceNumber ,
@ForeignKeyTable ,
@ReferenceKeyTable
END
CLOSE tempcursor
DEALLOCATE tempcursor
SELECT 'ALTER TABLE ' + FKTable + ' DROP CONSTRAINT ' + OBJECT_NAME(a.ConstraintID) AS DropKeys,
'ALTER TABLE ' + FKTable + ' WITH NOCHECK ADD CONSTRAINT ' + OBJECT_NAME(a.ConstraintID) + ' FOREIGN KEY(' + FBuildField + ') REFERENCES ' + RKTable + '(' + RBuildField+')' AS BuildKeys
,*
FROM #Const a
JOIN
(
SELECT ConstraintID, MAX(countfield) AS maxcount
FROM #Const
GROUP BY ConstraintID
) b ON a.ConstraintID = b.ConstraintID AND a.countfield = b.maxcount
JOIN
(
SELECT DISTINCT constraintid, '[' + OBJECT_SCHEMA_NAME(foreignkeyid) + '].[' + OBJECT_NAME(foreignkeyid) + ']' AS FKTable, '[' + OBJECT_SCHEMA_NAME(referencekeyid) + '].[' + OBJECT_NAME(referencekeyid) + ']' AS RKTable FROM #fk
) c ON a.constraintid = c.constraintid
DROP TABLE #Const