Question

Please give me advice, what is the efficient way to select data from database if I have query like SELECT * FROM order_list WHERE order_number = ? In table I have more entries (in my case) with common order number and I’d like to create List for entries with same order number and then shot it in ListView. I don’t know if it is efficient first select all order numbers and then in foreach loop select and create List<Item> or exists something better. I’ve tried find some example but unsuccessfully. How should I solve this problem? Thank you. I appreciate every help.

Answer 1

You can use the same you are thinking like this:

"select col1,col2,col3 from table   WHERE order_number = ? ", new String[]{YOUR_VARIABLE_HERE};

For example:

 public Object[] getData(String Id) {
    Cursor c = null;
    ArrayList<String> arrayListProductName = new ArrayList<String>();
    ArrayList<String> arrayListProductId = new ArrayList<String>();
    db=helper.getWritableDatabase();
    c = db.rawQuery("select distinct  Column1,Column2 from Table1inner join Table2 on Table1.anyId = Table2.anyId  Table2.Id = ?", new String[]{Id});   
    c.moveToFirst();
    while(!c.isAfterLast())
    {
        arrayListProductName.add(c.getString(c.getColumnIndex("Column1")));
        arrayListProductId.add(c.getString(c.getColumnIndex("Column2 ")));
        c.moveToNext();
    }
    c.close();
    db.close();
    return new Object[]{arrayListProductName,arrayListProductId};
    }

And in your Activity class:

helper = new YourDatabaseHelper(this);

Object[] objectScheme = merchandisingHelper.getData(retId);
arrayListSchemeProductName = (ArrayList<String>) objectScheme[0];
arrayListSchemeProductId = (ArrayList<String>) objectScheme[1];

Hope this will help you.

Thanks