Question

String weeklyQuery = "Select ItemName, SUM(Unit) As SoldUnit, SUM(Total) As
                      TotalAmount, SUM(Profit) As TotalProfit 
                      from InvoiceTable 
                      Where DateSO BETWEEN?AND?GROUPBY ItemName"

通过使用此查询，没有异常或错误阻塞bt结果未生成意味着没有提取单个记录。

Answer 1

嗯，您正试图以非常奇怪的方式对数据库进行查询。实际上，它是在java中从未这样做过。

您需要做什么：

Connection con = DriverManager.getConnection(
                     "jdbc:myDriver:myDatabase",
                     username,
                     password);

PreparedStatement pstmt = con.prepareStatement(
    "Select ItemName
          , SUM(Unit) As SoldUnit
          , SUM(Total) As TotalAmount
          , SUM(Profit) As TotalProfit 
       from InvoiceTable 
      Where DateSO BETWEEN ? AND ? GROUPBY ItemName");

pstmt.setDate(1, dateSOMin);
pstmt.setDate(2, dateSOMax);
ResultSet rs = pstmt.executeQuery();

while (rs.next()) {
    String itemName = rs.getString("ItemName");
    int soldUnit= rs.getInt("SoldUnit");
    int totalAmount= rs.getInt("TotalAmount");
    float totalProfit = rs.getFloat("TotalProfit");

    //do something with it
}

另外，请确保您的数据库sql dialect允许您编写BETWEEN min AND max？

您的数据库可能只允许您编写where DateSO >= min AND DateSO <= max

我建议您阅读本教程： http://docs.oracle.com/javase/tutorial/jdbc/index.html

Answer 2

由于缺乏信息，我会提出一个建议。

将between子句更改为DateSo＆gt; smallestDateYouWant和DateSo＆lt; largestDateYouWant

另外，附上样本集，以便我们可以在不盲目的情况下进行测试。

Answer 3

好吧，你写的查询语句没问题。但你可以尝试这样：

String weeklyQuery = "Select ItemName, SUM(Unit) As SoldUnit, SUM(Total) As
                      TotalAmount, SUM(Profit) As TotalProfit 
                      from InvoiceTable 
                      WHERE DateSO >= ? AND DateSO <= ? GROUPBY ItemName"

如何在java中访问两个日期之间获取数据？

3 个答案: