Hello Thomas, for me foreign key support is working. Directly after establishing the connection to the SQLite database (QSqlDatabase::open()) I use QSqlQuery to execute "PRAGMA foreign_keys = ON".
I think you have to do it every time you open a closed database, so I
implemented it in my database connection methods that it is executed if the
database connection was closed before.
Best greetings
Matthias
Am Mittwoch, 24. August 2016, 12:39:04 CEST schrieb TE:
> Hello fellow devs,
>
> I have two SQLite tables. The second table references a key from the
> first table as foreign key. Now when I delete a row in the first table I
> want all rows from the second table referencing the deleted key to be
> deleted as well. For this the action ON DELETE CASCADE seems to be
> appropriate. Unfortunately this doesn't work and the corresponding rows
> in the second table are *not* deleted.
>
> Here are the table definitions:
>
> First table:
> CREATE TABLE IF NOT EXISTS NodeMetaData (id INTEGER PRIMARY KEY,
> parentId INTEGER);
>
> Second table:
> CREATE TABLE IF NOT EXISTS NodeConcreteData (refId INTEGER NOT NULL,
> FOREIGN KEY(refId) REFERENCES NodeMetaData(id) ON DELETE CASCADE);
>
> In the sqlite docs, it is mentioned that foreign key support has to be
> acitvated. So I tried tx.executeSql("PRAGMA foreign_keys = ON;"). But
> the query tx.executeSql("PRAGMA foreign_keys;") returns 0.
>
> When I recreate the scenario in an interactive SQLite session, the above
> works (PRAGMA foreign_keys = ON has to be executed).
>
> Any ideas?
> Is the SFOS Qt lib compiled with foreign key support?
> What am I missing?
>
> Many thanks in advance!
> Thomas
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