En combinant vos conseils et un script que j'ai trouvé en ligne, j'ai créé une procédure qui produira du SQL que vous pouvez exécuter pour effectuer une suppression en cascade indépendamment de ON DELETE CASCADE . C'était probablement une grosse perte de temps, mais j'ai passé un bon moment à l'écrire. Un avantage de le faire de cette façon est que vous pouvez mettre un GO déclaration entre chaque ligne, et il n'est pas nécessaire qu'il s'agisse d'une grosse transaction. L'original était une procédure récursive; celui-ci déroule la récursivité dans une table de pile.
create procedure usp_delete_cascade (
@base_table_name varchar(200), @base_criteria nvarchar(1000)
)
as begin
-- Adapted from http://www.sqlteam.com/article/performing-a-cascade-delete-in-sql-server-7
-- Expects the name of a table, and a conditional for selecting rows
-- within that table that you want deleted.
-- Produces SQL that, when run, deletes all table rows referencing the ones
-- you initially selected, cascading into any number of tables,
-- without the need for "ON DELETE CASCADE".
-- Does not appear to work with self-referencing tables, but it will
-- delete everything beneath them.
-- To make it easy on the server, put a "GO" statement between each line.
declare @to_delete table (
id int identity(1, 1) primary key not null,
criteria nvarchar(1000) not null,
table_name varchar(200) not null,
processed bit not null,
delete_sql varchar(1000)
)
insert into @to_delete (criteria, table_name, processed) values (@base_criteria, @base_table_name, 0)
declare @id int, @criteria nvarchar(1000), @table_name varchar(200)
while exists(select 1 from @to_delete where processed = 0) begin
select top 1 @id = id, @criteria = criteria, @table_name = table_name from @to_delete where processed = 0 order by id desc
insert into @to_delete (criteria, table_name, processed)
select referencing_column.name + ' in (select [' + referenced_column.name + '] from [' + @table_name +'] where ' + @criteria + ')',
referencing_table.name,
0
from sys.foreign_key_columns fk
inner join sys.columns referencing_column on fk.parent_object_id = referencing_column.object_id
and fk.parent_column_id = referencing_column.column_id
inner join sys.columns referenced_column on fk.referenced_object_id = referenced_column.object_id
and fk.referenced_column_id = referenced_column.column_id
inner join sys.objects referencing_table on fk.parent_object_id = referencing_table.object_id
inner join sys.objects referenced_table on fk.referenced_object_id = referenced_table.object_id
inner join sys.objects constraint_object on fk.constraint_object_id = constraint_object.object_id
where referenced_table.name = @table_name
and referencing_table.name != referenced_table.name
update @to_delete set
processed = 1
where id = @id
end
select 'print ''deleting from ' + table_name + '...''; delete from [' + table_name + '] where ' + criteria from @to_delete order by id desc
end
exec usp_delete_cascade 'root_table_name', 'id = 123'
