返回多個ID時，有在數據庫中的相同值

Question

這是否會返回多個ID'S如果有多個排白衣相同的值（dataClicked）在COL_4？ COL_1 = 「ID」;

 public int getDateId(String dateClicked) { 

     int dateID=0; 
     String last_query = "SELECT " + COL_1 + " FROM " + TABLE_NAME + " WHERE " + COL_4 + " = '" + dateClicked + "'"; 
     Cursor c = database.rawQuery(last_query, null); 
     if (c != null && c.moveToFirst()) 
     { 
      dateID = c.getInt(0); 
     } 
     c.close(); 
     return dateID; 
    } 

如果它不是我可以存儲在數組中的值？我怎麼能這樣做

Answer 1

如果你有多個COL_4與dateClicked相同的值，那麼將返回多個COL_1。您可以將它們添加到列表中，如下所示：

public List<Integer> getDateIds(String dateClicked) { 
    List<Integer> ids = new ArrayList<>(); 

    String last_query = "SELECT " + COL_1 + " FROM " + TABLE_NAME + " WHERE " + COL_4 + " = '" + dateClicked + "'"; 
    Cursor c = database.rawQuery(last_query, null); 
    c.moveToFirst(); 
    while (!c.isAfterLast()) { 
     ids.add(c.getInt(0)); 

     c.moveToNext(); 
    } 
    c.close(); 
    return ids; 
}