Question

测试代码：

> String x = "30000000000.222";
> String y = "20000000000.444"; 
> double x1 = Double.parseDouble(x);  
> double y1 = Double.parseDouble(y);
> 
> ContentValues vValue51 = new ContentValues();
> vValue51.put(DatabaseStructure.fTmpAttr_X3         , x1 );
> vDatabase.insertData(DatabaseStructure.cTblTemporary3, vValue51);

> ContentValues vValue61 = new ContentValues(); 
> vValue61.put(DatabaseStructure.fTmpAttr_X3  , y1 );
> vDatabase.insertData(DatabaseStructure.cTblTemporary3, vValue61);

> vDatabase.closeDatabase();
> 
> 
> 
> List<Map<String, String>> vListData2 = new
> ArrayList<Map<String,String>>(); String vQuerY32;
>           
> 
> vQuerY32 = "Select SUM(" + DatabaseStructure.fTmpAttr_X3 + " ) 'jik' " + 
>            "From " + DatabaseStructure.cTblTemporary3; 
> 
>           vDatabase = new DatabaseHandler(getApplicationContext());
>           vListData2 = vDatabase.getListData(vQuerY32);
>           vDatabase.closeDatabase();

I tried many data type for column

> vQuery = "create table " + cTblTemporary3 +
>                "("+
>                fTmpAttr_ID3 + " integer primary key, " +
>                fTmpAttr_V3  + " DECIMAL(10,5), " +
>                fTmpAttr_W3  + " FLOAT , " +
>                fTmpAttr_X3  + " REAL, " +
>                fTmpAttr_Y3  + " DOUBLE PRECISION, " +
>                fTmpAttr_Z3  + " double " +
>                ")";       vSQL.execSQL(vQuery);

====================== getListDataFunction ======================== ===================

 public List<Map<String, String>> getListData(String vQuery)
{

  List<Map<String, String>> vListData = new ArrayList<Map<String,String>>();

  Cursor vCursor = getCursorData(vQuery);
  int vLength = vCursor.getColumnCount();
  String[] vFields = new String[vLength];

  if (vCursor.getCount() > 0){
      for (int i = 0; i < vLength; i++) 
          vFields[i] = vCursor.getColumnName(i);

      vCursor.moveToFirst();
      while (!vCursor.isAfterLast()) {

          Map<String, String> vMapData = new HashMap<String, String>();

          for (int i = 0; i < vLength; i++) 
              vMapData.put(vFields[i], vCursor.getString(i));

          vListData.add(vMapData);

          vCursor.moveToNext();
      }
  }

  vCursor.close();
  return vListData;       
}

我记录结果

Log.d（＆＃34; TEST＆＃34;，vListData2.get（0）.get（＆＃34; jik＆＃34;））;

，结果不是50000000000.666而是5e + 10，我怎么能得到50000000000.666的结果呢？请帮助这个新手:(

sqlite SUM结果十进制消失了

0 个答案: