也有兩種方法，跟視屏中的類似，也有封裝好的api方法，只要填相應的字段，也可以自己寫。比如：

public?void?onClick(View?v)?{
????SQLiteDatabase?db?=?dbHelper.getWritableDatabase();
????//查詢Book表中的所有數據，后面的都為null表示查找所有數據，沒有條件，這種是封裝好的api方法
????Cursor?cursor?=?db.query("Book",?null,?null,?null,?null,?null,?null);
????if?(cursor.moveToFirst())?{
????????do?{
????????????//遍歷Cursor對象，取出數據并打印
????????????String?name?=?cursor.getString(cursor.getColumnIndex("name"));
????????????String?author?=?cursor.getString(cursor.getColumnIndex("author"));
????????????int?pages?=?cursor.getInt(cursor.getColumnIndex("pages"));
????????????Double?price?=?cursor.getDouble(cursor.getColumnIndex("price"));
????????????Log.d(TAG,?"book?name?is?"?+?name);
????????????Log.d(TAG,?"book?author?is?"?+?author);
????????????Log.d(TAG,?"book?pages?is?"?+?pages);
????????????Log.d(TAG,?"book?price?is?"?+?price);
????????}?while?(cursor.moveToNext());
????}
????cursor.close();
}

select 字段名 from 表名 where 查詢條件