When QSqlQuery .exec function called?
-
when i using under code
[code example] :
q.prepare();
~
int tracking_id = 0;
tracking_id ++;
~
if(tracking_id == 2)
{
q.bindvalue(":ti", tracking_id);
}
~
if(q.exec())
{
emit send_data_to_center(data);
}======================================
end of the running this code
when i check the db
i found tracking_id 0,1,2why this happend ?
i thought .exec function only called when exist q.bindvalue ....
please help me... -
when i using under code
[code example] :
q.prepare();
~
int tracking_id = 0;
tracking_id ++;
~
if(tracking_id == 2)
{
q.bindvalue(":ti", tracking_id);
}
~
if(q.exec())
{
emit send_data_to_center(data);
}======================================
end of the running this code
when i check the db
i found tracking_id 0,1,2why this happend ?
i thought .exec function only called when exist q.bindvalue ....
please help me...When QSqlQuery .exec function called?
It is called when it executes the
if(q.exec())in your code.i thought .exec function only called when exist q.bindvalue ....
It is called when the line is hit. If you have only called
q.bindvalue()whentracking_id == 2then no value will be bound to:tiwhentracking_id != 2, which will presumably cause your query not to work. We don't know because you don't show what your query is. -
thanks for your comment :)
it's my query :q.prepare("INSERT INTO "TABLE NAME" (id, tracking_id, check)"
"VALURE (:id, :ti)" "ON CONFLICT (id) DO UPDATE SET tracking_id=:ti");so.. can you tell me what is problem is?
i want to excute the .exec function only "tracking_id == 2"
but now the .exec function also return true when tracking_id == 0 or 1 -
@donkey007 said in When QSqlQuery .exec function called?:
i want to excute the .exec function only "tracking_id == 2"
Then change your code so it does what you want. Currently you always call exec().
