我经常看到这样的代码:迭代数据库查询的结果,对每一行执行一些操作,然后转到下一行.典型的例子如下.
Cursor cursor = db.rawQuery(...);
cursor.moveToFirst();
while (cursor.isAfterLast() == false)
{
...
cursor.moveToNext();
}
Cursor cursor = db.rawQuery(...);
for (boolean hasItem = cursor.moveToFirst();
hasItem;
hasItem = cursor.moveToNext()) {
...
}
Cursor cursor = db.rawQuery(...);
if (cursor.moveToFirst()) {
do {
...
} while (cursor.moveToNext());
}
在我看来,这些方法似乎都太冗长了,每个方法都对Cursor
个方法进行了多次调用.肯定有更整洁的方法吗?