Est-il possible de mettre à jour une valeur de colonne de clé primaire en cascadant la mise à jour parmi toutes les clés étrangères qui la référencent?
# EDIT 1: lorsque j'exécute une requête de suivi
select * from sys.foreign_keys where referenced_object_id=OBJECT_ID('myTable') , Je vois que update_referential_action est mis à 0. Ainsi, AUCUNE ACTION n'est prise après la mise à jour de mes colonnes de clés primaires. Comment puis-je mettre à jour les clés étrangères pour les rendre À LA MISE À JOUR EN CASCADE ?
# EDIT 2:
Afin de créer un script pour la création ou la suppression de toutes les clés étrangères dans votre schéma, exécutez le script suivant (extrait d' ici )
DECLARE @schema_name sysname;
DECLARE @table_name sysname;
DECLARE @constraint_name sysname;
DECLARE @constraint_object_id int;
DECLARE @referenced_object_name sysname;
DECLARE @is_disabled bit;
DECLARE @is_not_for_replication bit;
DECLARE @is_not_trusted bit;
DECLARE @delete_referential_action tinyint;
DECLARE @update_referential_action tinyint;
DECLARE @tsql nvarchar(4000);
DECLARE @tsql2 nvarchar(4000);
DECLARE @fkCol sysname;
DECLARE @pkCol sysname;
DECLARE @col1 bit;
DECLARE @action char(6);
DECLARE @referenced_schema_name sysname;
DECLARE FKcursor CURSOR FOR
select OBJECT_SCHEMA_NAME(parent_object_id)
, OBJECT_NAME(parent_object_id), name, OBJECT_NAME(referenced_object_id)
, object_id
, is_disabled, is_not_for_replication, is_not_trusted
, delete_referential_action, update_referential_action, OBJECT_SCHEMA_NAME(referenced_object_id)
from sys.foreign_keys
order by 1,2;
OPEN FKcursor;
FETCH NEXT FROM FKcursor INTO @schema_name, @table_name, @constraint_name
, @referenced_object_name, @constraint_object_id
, @is_disabled, @is_not_for_replication, @is_not_trusted
, @delete_referential_action, @update_referential_action, @referenced_schema_name;
WHILE @@FETCH_STATUS = 0
BEGIN
IF @action <> 'CREATE'
SET @tsql = 'ALTER TABLE '
+ QUOTENAME(@schema_name) + '.' + QUOTENAME(@table_name)
+ ' DROP CONSTRAINT ' + QUOTENAME(@constraint_name) + ';';
ELSE
BEGIN
SET @tsql = 'ALTER TABLE '
+ QUOTENAME(@schema_name) + '.' + QUOTENAME(@table_name)
+ CASE @is_not_trusted
WHEN 0 THEN ' WITH CHECK '
ELSE ' WITH NOCHECK '
END
+ ' ADD CONSTRAINT ' + QUOTENAME(@constraint_name)
+ ' FOREIGN KEY (';
SET @tsql2 = '';
DECLARE ColumnCursor CURSOR FOR
select COL_NAME(fk.parent_object_id, fkc.parent_column_id)
, COL_NAME(fk.referenced_object_id, fkc.referenced_column_id)
from sys.foreign_keys fk
inner join sys.foreign_key_columns fkc
on fk.object_id = fkc.constraint_object_id
where fkc.constraint_object_id = @constraint_object_id
order by fkc.constraint_column_id;
OPEN ColumnCursor;
SET @col1 = 1;
FETCH NEXT FROM ColumnCursor INTO @fkCol, @pkCol;
WHILE @@FETCH_STATUS = 0
BEGIN
IF (@col1 = 1)
SET @col1 = 0;
ELSE
BEGIN
SET @tsql = @tsql + ',';
SET @tsql2 = @tsql2 + ',';
END;
SET @tsql = @tsql + QUOTENAME(@fkCol);
SET @tsql2 = @tsql2 + QUOTENAME(@pkCol);
FETCH NEXT FROM ColumnCursor INTO @fkCol, @pkCol;
END;
CLOSE ColumnCursor;
DEALLOCATE ColumnCursor;
SET @tsql = @tsql + ' ) REFERENCES ' + QUOTENAME(@referenced_schema_name) + '.' + QUOTENAME(@referenced_object_name)
+ ' (' + @tsql2 + ')';
SET @tsql = @tsql
+ ' ON UPDATE ' + CASE @update_referential_action
WHEN 0 THEN 'NO ACTION '
WHEN 1 THEN 'CASCADE '
WHEN 2 THEN 'SET NULL '
ELSE 'SET DEFAULT '
END
+ ' ON DELETE ' + CASE @delete_referential_action
WHEN 0 THEN 'NO ACTION '
WHEN 1 THEN 'CASCADE '
WHEN 2 THEN 'SET NULL '
ELSE 'SET DEFAULT '
END
+ CASE @is_not_for_replication
WHEN 1 THEN ' NOT FOR REPLICATION '
ELSE ''
END
+ ';';
END;
PRINT @tsql;
IF @action = 'CREATE'
BEGIN
SET @tsql = 'ALTER TABLE '
+ QUOTENAME(@schema_name) + '.' + QUOTENAME(@table_name)
+ CASE @is_disabled
WHEN 0 THEN ' CHECK '
ELSE ' NOCHECK '
END
+ 'CONSTRAINT ' + QUOTENAME(@constraint_name)
+ ';';
PRINT @tsql;
END;
FETCH NEXT FROM FKcursor INTO @schema_name, @table_name, @constraint_name
, @referenced_object_name, @constraint_object_id
, @is_disabled, @is_not_for_replication, @is_not_trusted
, @delete_referential_action, @update_referential_action, @referenced_schema_name;
END;
CLOSE FKcursor;
DEALLOCATE FKcursor;
Pour générer le script de clés étrangères DROP, modifiez la valeur @action pour qu'elle soit égale à 'DROP' dans la clause de déclaration:
DECLARE @action char(6) = 'DROP';