更新查询SQLite提供空指针异常

Question

我用过db = this.getWritableDatabase（）;在构造函数本身，所以我没有使用特定的打开或关闭功能。我是不是该？

public void changeCabLocation(String to_loc, String cab_id2) {
    // TODO Auto-generated method stub
    ContentValues val=new ContentValues();
    val.put(cab_location, to_loc);
    db.update(TB_cabs, val, cab_id+"="+cab_id2, null);
}

public void changeDriverLocation(String to_loc, String driver_id2) {
    // TODO Auto-generated method stub
    ContentValues val=new ContentValues();
    val.put(driver_location, to_loc);
    db.update(TB_drivers, val, driver_id+"="+driver_id2, null);
}

Answer 1

尝试以下方法：

db.update(TB_cabs, val, "cab_id=?", new String[] {cab_id2});