How to get sqlite error message RAISE by trigger

[miraks]

Hi,

I have a sqlite database containing trigger to manage constraints.
(see attached file)

If I try to violate a constraint with sqlite3, the right error message is returned:

sqlite> delete from unit;
SQL error: delete on table unit violates foreign key constraint fkd_unit_unit_rc_unit_id_id

sqlite> delete from unit;
SQL error: delete on table unit violates foreign key constraint fkd_unit_unit_rc_unit_id_id

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But, if I try to violate a constraint with QT API (QSqlQuery), this error message is returned by QSqlError::lastError():

constraint failed Impossible d'extraire la ligne

constraint failed Impossible d'extraire la ligne

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Do you know how to do to retrieve the right error message with QT API ?

In advance, thank you.