java - Android Studio >> GetCount()

Question

我有一个简单的问题，这将帮助我理解很多(我希望!)

好吧，我有这个代码:

// Getting contacts Count
    public int getContactsCount() {

    helper = new DBHelper(CheckTable.this);
    SQLiteDatabase db = helper.getReadableDatabase();

    String countQuery = "SELECT  * FROM " + Market.TABLE;

    Cursor cursor = db.rawQuery(countQuery, null);
    cursor.close();

    // return count
    return cursor.getCount();
}

如何显示这个号码？!

提前谢谢你...

Answer 1

此方法将返回您一个int。因此你必须在你的类(class)中声明它。假设您想在同一个类中显示这个数字，您可以简单地按照以下步骤操作:

   public class Example{

  // Getting contacts Count
    public int getContactsCount() {

    helper = new DBHelper(CheckTable.this);
    SQLiteDatabase db = helper.getReadableDatabase();

    String countQuery = "SELECT  * FROM " + Market.TABLE;

    Cursor cursor = db.rawQuery(countQuery, null);
    cursor.close();

    // return count
    return cursor.getCount();
}


 public static void main(String[] args) { //main method
    int a= getContactsCount(); //calling the method
    System.out.println(a);  //displaying the integer
}
}