Did you try?
I combined both the
PRAGMA foreign_keys = ON;
and
PRAGMA foreign_keys;
into one transaction.
David
On 24/08/16 14:56, TE wrote:
Sorry for being ambiguous. It returns: {"foreign_keys":0}
On 24.08.2016 15:53, David Greaves wrote:
What does
function queryForeignKeysEnabled()
{
instance().transaction(function(tx) {
var rs = tx.executeSql("PRAGMA foreign_keys = ON; PRAGMA
foreign_keys;");
console.log(JSON.stringify(rs.rows.item(0)))
});
}
return?
David
On 24/08/16 13:45, TE wrote:
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
_______________________________________________
SailfishOS.org Devel mailing list
To unsubscribe, please send a mail to
devel-unsubscr...@lists.sailfishos.org
_______________________________________________
SailfishOS.org Devel mailing list
To unsubscribe, please send a mail to
devel-unsubscr...@lists.sailfishos.org
_______________________________________________
SailfishOS.org Devel mailing list
To unsubscribe, please send a mail to
devel-unsubscr...@lists.sailfishos.org
_______________________________________________
SailfishOS.org Devel mailing list
To unsubscribe, please send a mail to
devel-unsubscr...@lists.sailfishos.org
_______________________________________________
SailfishOS.org Devel mailing list
To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
_______________________________________________
SailfishOS.org Devel mailing list
To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
