Question

我有一个表定义为

String currencyTableQueryString = "create table if not exists "
            + CURRENCY_NAME + " (" + CURRENCY_ROW_ID
            + " integer primary key autoincrement not null,"
            + CURRENCY_USD + " double," + CURRENCY_INR + " double,"
            + CURRENCY_EUR + " double," + CURRENCY_GBP + " double"
            + ");";

我从JSON中将数据存储在此表中。例如，我已存储此数据

CURRENCY_USD = 1.0
CURRENCY_INR = 53.997369
CURRENCY_EUR = 0.764879
CURRENCY_GBP = 0.658136

在我的下一个活动中，我从数据库中获取此数据

Ccursor = db.query(CURRENCY_NAME, new String[] { CURRENCY_ROW_ID, CURRENCY_USD, CURRENCY_INR,
            CURRENCY_EUR, CURRENCY_GBP }, null, null, null, null, null);

我拿取时总是得到错误的数据。它给了我所有领域中非常高的数字。我不确定我做错了什么。（P.S.我是Java和Android编程的新手）。

这是插入上述数字时获取的输出

CURRENCY_USD = 1.072693248E9
CURRENCY_INR = -1.0925335E8
CURRENCY_EUR = -1.80473634E8
CURRENCY_GBP = 9.1173113E7

有人可以指导我这里出了什么问题吗？

这是我的提取光标。

ArrayList<ArrayList<Object>> dataArrays = new ArrayList<ArrayList<Object>>();

    Cursor Ccursor;

    try {
        // ask the database object to create the cursor.
        Ccursor = db.query(CURRENCY_NAME, new String[] { CURRENCY_ROW_ID, CURRENCY_USD, CURRENCY_INR,
                CURRENCY_EUR, CURRENCY_GBP }, null, null, null, null, null);

        // move the cursor's pointer to position zero.
        Ccursor.moveToFirst();

        // if there is data after the current cursor position, add it
        // to the ArrayList.
        if (!Ccursor.isAfterLast()) {
            do {
                ArrayList<Object> dataList = new ArrayList<Object>();

                dataList.add(Ccursor.getLong(0));
                dataList.add(Ccursor.getDouble(1));
                dataList.add(Ccursor.getDouble(2));
                dataList.add(Ccursor.getDouble(3));
                dataList.add(Ccursor.getDouble(4));

                dataArrays.add(dataList);
            }
            // move the cursor's pointer up one position.
            while (Ccursor.moveToNext());
        }
        Ccursor.close();
    } catch (SQLException e) {
        Log.e("DB Error in Currency Retreive all", e.toString());
        e.printStackTrace();
    }

Answer 1

您可以从ddms视图数据导出数据库 - 数据到桌面并使用SqliteBrowser Link进行检查，确保插入数据是否正确，然后使用某个ID获取数据并检查

Android SQLite Double变量在fetch上提供垃圾数据

1 个答案: