How can I get the all data of row of one by the name Android SQLite DB?

in data class:

public String getDb(String r_c ){
    String dd = new String();
    String where = "name" + "=" + r_c;
    Cursor cursor = db.query( "info" , null , where , null,null ,null , null);
    if(cursor !=null && cursor.moveToFirst()){
        do{
            dd = (cursor.getString(1)+"\n " + cursor.getString(3)+"\n" + cursor.getString(2)+"\n" + cursor.getString(4));
        }
        while (cursor.moveToNext());
    }
    return dd ;
}
public void del(String r_c){
    String where = "name" + " = " + r_c;
    db.delete("info", where, null);


}

in my activity:

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            int itemPosition   = position;
            z = String.valueOf(itemPosition + 1);
            final String a = parent.getAdapter().getItem(itemPosition).toString();

            String aa = dba.getDb(a);
            AlertDialog.Builder ad = new AlertDialog.Builder(view.this);
            ad.setTitle("data");
            ad.setMessage(aa);
            ad.setPositiveButton("ok", null);
            ad.setNegativeButton("delet", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dba.del(a);
                    loadList();
                }
            });
            ad.show();


        }

at the first I made it by ID but when I delete any row found that an error of data I just wont to do it by NAME to avoid this problem but it didn't work....