Question

public Cursor ShowBarchartIncome(int yearChoose) {
    Cursor cur1=db.rawQuery("SELECT "+COLEXPENSE+" as _id,"+" SUM(PRICE) as price from "+EXPENSETABLE
    +" WHERE ("+YEAREX+" = "+2012+") AND ("+MONTHEX+" = 01) AND ("+TYPE+" = 'income')",new String [] {});
    return cur1;    
  }
public class BarGraph { 
    public Intent getIntent(Context context) {

        DBHelper.open();            
        int spn=editYEAR.getId();
        int e = Integer.valueOf(spn);
        c = DBHelper.ShowBarchartIncome(e);
        startManagingCursor(c);

        //data 1
        int[] y ={**c.getCount()**,443,443,456,234,123,342,134,123,645,234,274};
        CategorySeries series = new CategorySeries("รายรับ");
        for(int i=0;i<y.length;i++){
        series.add("Bar "+ (i+1),y[i]);     
    }
}

我无法获得真实的数据和价格，它返回1到int[] y ={c.getCount()}

如果真实数据为15000

，如何在showbarchartincome中获取数据总和价格

Answer 1

尝试代替new String [] {}只使用null。

Cursor cur1=db.rawQuery("SELECT "+COLEXPENSE+" as _id,"+" SUM(PRICE) as price from "+EXPENSETABLE
            +" WHERE ("+YEAREX+" = "+2012+") AND ("+MONTHEX+" = 01) AND ("+TYPE+" = 'income')", null);

<强>更新

要从光标获取数据，您应添加以下行：

c.moveToFirst();
price = c.getInt(c.getColumnIndex("price"));

c.getCount() just show the number of returned records.

我想从光标的int数据请帮助我

1 个答案: