Re: [SailfishDevel] SQLite: ON DELETE CASCADE with Foreign Keys not working
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",
> 500); /* 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
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Re: [SailfishDevel] SQLite: ON DELETE CASCADE with Foreign Keys not working
Oh, maximum sorry! I missed your proposed changes, which btw result in
the following (non?-)error:
Error: not an error Unable to execute multiple statements at a time
Cheers,
Thomas
On 24.08.2016 16:03, David Greaves wrote:
> 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",
500); /* 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
>
>
>
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Re: [SailfishDevel] SQLite: ON DELETE CASCADE with Foreign Keys not working
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",
500); /* 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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Re: [SailfishDevel] SQLite: ON DELETE CASCADE with Foreign Keys not working
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",
500); /* 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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Re: [SailfishDevel] SQLite: ON DELETE CASCADE with Foreign Keys not working
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",
500); /* 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
>
>
>
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Re: [SailfishDevel] SQLite: ON DELETE CASCADE with Foreign Keys not working
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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> To unsubscribe, please send a mail to devel-unsubscr...@lists.sailfishos.org
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[SailfishDevel] SQLite: ON DELETE CASCADE with Foreign Keys not working
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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