通過兩個屬性來訂購SQLite

我爲我想存儲在我的應用中的事件設置了一個正常的SQLite數據庫。每個對象都具有以下屬性：通過兩個屬性來訂購SQLite

private static final String KEY_ID = "id"; 
private static final String KEY_NAME = "name"; 
private static final String KEY_GENDER = "gender"; 
private static final String KEY_CATEGORY = "category"; 
private static final String KEY_DAY = "day"; 
private static final String KEY_MONTH = "month"; 
private static final String KEY_YEAR = "year";

如何按天和月訂購此數據庫？我的目標是用這個填充ListView，因此我需要按日期排序（不是年，只有日和月）。

來源

2014-11-04 M P

所以它與Android類，查找_id兼容，你應該命名爲id字段_id。 – danny117 2014-11-04 18:43:52

@ danny17這不是必要的。您始終可以使用別名。 – 2014-11-04 19:00:36

'SELECT * FROM myTable ORDER BY day，month'（我會換一個月一天） – 2014-11-04 19:01:41

MyDatabaseHelper.java

public class MyDatabaseHelper extends SQLiteOpenHelper { 
private static final String DATABASE_NAME="dbname"; 
public static final String KEY_ID = "_id"; 
public static final String KEY_NAME = "name"; 
public static final String KEY_GENDER = "gender"; 
public static final String KEY_CATEGORY = "category"; 
public static final String KEY_DAY = "day"; 
public static final String KEY_MONTH = "month"; 
public static final String KEY_YEAR = "year"; 


public DatabaseDomeny(Context context) { 
    super(context, DATABASE_NAME2, null, 1); 
} 

@Override 
public void onCreate(SQLiteDatabase db) { 

    db.execSQL("CREATE TABLE mytable (_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, " + 
      "gender TEXT, category TEXT, day TEXT, month TEXT, year TEXT);"); 



} 

@Override 
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    android.util.Log.w("mytable", "Upgrading database, which will destroy all old data"); 
    db.execSQL("DROP TABLE IF EXISTS mytable"); 
    onCreate(db); 
} 


}

MyActivity.java

public class MyActivity extends ListActivity { 

private SQLiteDatabase db=null; 
private Cursor constantsCursor=null; 


@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    db=(new MyDatabaseHelper(this)).getWritableDatabase(); 


    list_it(); 

    ListView lv = getListView(); 


    lv.setOnItemClickListener(new OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 


     } 
    }); 

} 


private void list_it() { 
    constantsCursor=db.rawQuery("SELECT * FROM mytable WHERE _id > 0 ORDER BY day, month ", 
      null); 

    ListAdapter adapter=new SimpleAdapter(this, 
      R.layout.mylistxml, constantsCursor, 
      new String[] {"name", "gender", "category", "day", "month", "year"}, 
      new int[] {R.id.name, R.id.gender, R.id.category, R.id.day, R.id.month, R.id.year}); 

    setListAdapter(adapter); 
} 




@Override 
public void onDestroy() { 
    super.onDestroy(); 

    constantsCursor.close(); 
    db.close(); 
} 

}

來源

2014-11-05 07:08:50 eurosecom

通過兩個屬性來訂購SQLite

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