Hello Thomas, I never used LocalStorage directly from QML/JS. I access the database from the C++ part. Your code looks like if you are using database transaction/commit.
But in C++ for me it did not work to set the PRAGMA if it is part of a
database transaction. I have to execute it on its own, without transaction/
commit.
Best greetings
Matthias
Am Mittwoch, 24. August 2016, 14:45:13 CEST schrieb TE:
> Hello Matthias,
>
> thanks for the quick reply! I access the database from the QML/JS
> domain. To open a connection I use the following function:
>
> function instance()
> {
> var db = Storage.LocalStorage.openDatabaseSync("Db", "", "Nodes",
> 5000000); /* DB Size: 5MB */
> db.transaction(function(tx) {
> tx.executeSql("PRAGMA foreign_keys = ON;");
> });
> return db
> }
>
> The following test function
>
> function queryForeignKeysEnabled()
> {
> instance().transaction(function(tx) {
> var rs = tx.executeSql("PRAGMA foreign_keys;");
> console.log(JSON.stringify(rs.rows.item(0)))
> });
> }
>
> returns
>
> {"foreign_keys":0}.
>
> Can you map this implementation to your C++ code and tell the difference?
>
> Cheers,
> Thomas
>
> On 24.08.2016 13:54, Matthias Fehring wrote:
> > 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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