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* The database needs a trigger to get rid of self-references to

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prevent a foreign key constraint violation on the Refs table when
  deleting a path.
This commit is contained in:
Eelco Dolstra 2010-02-22 14:18:55 +00:00
parent c4d388add4
commit 9cda616949
2 changed files with 20 additions and 2 deletions
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10
src/libstore/schema.sql
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@ -17,6 +17,16 @@ create table if not exists Refs (
create index if not exists IndexReferrer on Refs(referrer);
create index if not exists IndexReference on Refs(reference);
-- Paths can refer to themselves, causing a tuple (N, N) in the Refs
-- table. This causes a deletion of the corresponding row in
-- ValidPaths to cause a foreign key constraint violation (due to `on
-- delete restrict' on the `reference' column). Therefore, explicitly
-- get rid of self-references.
create trigger DeleteSelfRefs before delete on ValidPaths
begin
delete from Refs where referrer = old.id and reference = old.id;
end;
create table if not exists DerivationOutputs (
drv integer not null,
id text not null, -- symbolic output id, usually "out"