無法從SQLite數據庫在Android中使用Group By子句

Question

當前計我有一個表中SQLite數據庫，如下所示：

JobId STRING,RigId STRING,area STRING,spares STRING,spare_id STRING

我想有行數的計數相同的spare_id，即如果4行有spare_id = 2，那麼返回的計數應該是4.

我寫了下面的查詢，但我沒有得到正確的計數。誰能告訴我爲什麼。我的代碼如下：

public int get_report_entry_spare_count(String jobId, 
     String RigID) { 

    String countQuery="SELECT *, COUNT(*) AS spare_id FROM spare_replaced GROUP BY spare_id "; 

    SQLiteDatabase database = this.getWritableDatabase(); 

    Cursor c = database.rawQuery(countQuery, null); 
    c.moveToFirst(); 
    int total = c.getInt(0); 
    // int total = c.getCount(); 
    c.close(); 
    return total; 
} 

Answer 1

嘗試這個代碼。

public int get_report_entry_spare_count(String jobId, 
      String RigID) { 

     String countQuery="SELECT COUNT(*) AS spare_id FROM spare_replaced GROUP BY spare_id "; 

     SQLiteDatabase database = this.getWritableDatabase(); 

     Cursor c = database.rawQuery(countQuery, null); 
     c.moveToFirst(); 
     int total = c.getInt(0);   
     c.close(); 
     return total; 
    }