[英]Android ListView - Get Values from SQLite with group by for one of the columns
我在我的Android應用程序中將SQLite表中的列呈現為ListView。 數據如下所示:
Project Name OutletName param
RA_Pepsi Tesco Shelfstrip left
RA_Pepsi Tesco Shelfstrip right
RA_Cocacola Tesco Shelfstrip top
RA_Cocacola Coors Shelfstrip bottom
我正在使用以下代碼來呈現ListView
sqLiteDatabase = sqLiteHelper.getWritableDatabase();
cursor = sqLiteDatabase.rawQuery("SELECT * FROM "+SQLiteHelper.TABLE_NAME2+"", null);
ProjectName_Array.clear();
OutletName_Array.clear();
ParamName_Array.clear();
if (cursor != null && cursor.getCount() > 0) {
if (cursor.moveToFirst()) {
do {
ProjectName_Array.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.Table2_Column_ProjectName)));
OutletName_Array.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.Table2_Column_OutletName)));
ParamName_Array.add(cursor.getString(cursor.getColumnIndex(SQLiteHelper.Table2_Column_PARAM)));
} while (cursor.moveToNext());
}
} else {
Toast.makeText( this, "No data to display!", Toast.LENGTH_SHORT ).show();
}
使用自定義適配器,這將數據呈現為ListView,如下所示:
RA_Pepsi
Tesco
Shelfstrip left
RA_Pepsi
Tesco
Shelfstrip right
RA_CocaCola
Tesco
Shelfstrip top
RA_CocaCola
Coors
Shelfstrip bottom
但是,我想在每個項目和存儲級別匯總參數,並顯示如下
RA_Pepsi
Tesco
Shelfstrip left
Shelfstrip right
RA_CocaCola
Tesco
Shelfstrip top
當我同時使用項目和插座名稱列嘗試按組分組時,我僅獲得一個呈現的參數。 如何顯示帶有聚合數據的列表視圖。
嘗試使用SQLite的group_concat()函數, 在此處查看 。
像這樣更改您的sql:
SELECT 'Project Name',OutletName,group_concat(param) as params
FROM tableName
GROUP BY 'Project Name',OutletName
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