QSqlError.number() always returns -1

SGaist

Hi,

Please show the code you are using as well as the query you are trying to execute.

chraz

Hello @SGaist
Here is the code :

int Project::insert()
{
    QSqlQuery query = DbConnector::getQuery();
    query.prepare("INSERT INTO project(name, description, color) VALUES(:n, :d, :c)");
    query.bindValue(":n", name);
    query.bindValue(":d", description);
    query.bindValue(":c", color);
    if(!query.exec())
    {
        qDebug() << query.lastError().number();
    }
    return query.lastInsertId().toInt();
}

I intentionnally droped the table, so I expect to see a kind of "No such table" or something like that.

jsulm

@chraz What happens if you try to do the same on SQL console?

chraz

INSERT INTO project(name, description, color) VALUES("P1", "D1", "#000000");

Got error :

Error while executing SQL query on database 'todos': no such table: project

SGaist

Which version of Qt are you using ?

chraz

Desktop Qt 5.2.0 MinGW 32bit

mranger90

Did you check the return of the query.prepare call ?
Perhaps you are not connected to the database.

chraz

int Project::insert()
{
    QSqlQuery query = DbConnector::getQuery();
    if(!query.prepare("INSERT INTO project(name, description, color) VALUES(:n, :d, :c)"))
    {
        qDebug() << "PREPARE : " << query.lastError().text();
        return 0;
    }
    query.bindValue(":n", name);
    query.bindValue(":d", description);
    query.bindValue(":c", color);
    if(!query.exec())
    {
        qDebug() << query.lastError().number();
    }
    return query.lastInsertId().toInt();
}

So it gaves me :

PREPARE :  "no such table: project Unable to execute statement"

@mranger90 , thanks for your help.
I'll mark it as resolved.

SGaist

On a side note, support for named placeholder with SQLite requires a more recent version of Qt.

chraz

Can you explain a little more ?

SGaist

Proper handling of named placeholder (e.g. the :n you are using) has been implemented recently and you are using an old 5.2.0 release current is 5.10.1 with 5.11 around the corner.