i my problem:

I build a db connection to an 1.5 Firebird db server whit QT - no
problems. I open the connection - no problem. But if I execute a
QSqlQuery I get the following error from query.lastError().text() and
query.lastError().databaseText():

Unsuccessful execution caused by system error that does
not preclude successful execution of subsequent statements
Could not prepare statement


code:
QSqlDatabase db = QSqlDatabase::addDatabase("QIBASE");
db.setHostName("127.0.0.1");
db.setDatabaseName("xxx");
db.setUserName("SYSDBA");
db.setPassword("masterkey");

if(db.open())
{
QSqlQuery query;
query.exec("SELECT id FROM test");
}




I have checked the following things:
1. the table exist
2. the colum exist
3. db.lastError().driverText() return no error
4. db.lastError().databaseText() return no error

I hope you can help me. Thanks.

baloo