Must be seeing things... but why:

Qt Code: 
  1. sql = "SELECT * FROM garmin_packets WHERE unit_imei=? AND fmi_packet_id=? AND unique_id=?";
  2.     queryCheck.prepare(sql);
  3.     queryCheck.bindValue(0, this->connAvlImei);
  4.     queryCheck.bindValue(1, FMI_A607_DRIVER_ID_UPDATE);
  5.     queryCheck.bindValue(2, driver_id.change_id);
  6.     queryCheck.exec ( sql );
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produces this:
Qt Code: 
  1. "SELECT * FROM garmin_packets WHERE unit_imei=? AND fmi_packet_id=? AND unique_id=?"
  2. QSqlError(-1, "QPSQL: Unable to create query", "ERROR:  operator does not exist: character =?
  3. LINE 1: SELECT * FROM garmin_packets WHERE unit_imei=? AND fmi_packe...
  4.  
  5. HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.                                                                                                                                   
  6. ")
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???

Btw I made sure to check my stupidity and caffeine levels... all checked out inside reasonable range...