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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>
>
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