Question

我正在编写一个JDBC程序，我需要获取特定列的总和。

当我执行sysout时，正在打印的结果是正确的，但问题是，它是打印行大小的时间。我的列大小为882，结果打印为time takes s 5.75 882次（5.75是该列的总和）。

以下是我的代码。

public int getTotalFromDB() throws Exception {
        Connection conn = dbConnection.getConn();
        Statement stmt, stmt1 = dbConnection.getStmt();
        ResultSet rs, rs1 = dbConnection.getRs();

        String queryString, queryString1 = null;
        dbConnection.createClassForNameForSQLServer();
        String userName = "sa";
        String password = "mypassword";
        String url = "MYDBURL";
        dbConnection.createClassForNameForSQLServer();
        conn = DriverManager.getConnection(url, userName, password);
        stmt = conn.createStatement();
        stmt1 = conn.createStatement();
        queryString = "SELECT COUNT(*) as CNT from statusTable";
        queryString1 = "select sum([Time Taken(minutes)]) as timeTaken from statusTable";
        rs = stmt.executeQuery(queryString);
        rs.next();
        DBCount = rs.getInt("CNT");
        rs.close();
        stmt.close();
        rs1 = stmt1.executeQuery(queryString1);
        rs1.next();
        timeTaken = rs1.getFloat("timeTaken");
        rs1.close();
        stmt1.close();
        System.out.println("Time taken s " + timeTaken);
        return DBCount;
    }

调用它的代码如下。

JSP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

</head>
<body>

    <form action="GetTheCounts" method="get" id="form1">
        <div class="status">
            <span class="totalTime">Count is ${DAOCount}/${excelCount}</span> <span
                class="efficiency"></span>
        </div>
    </form>
    <script type="text/javascript">
        document.getElementById("form1").submit();
    </script>
</body>
</html>

控制器

protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    GetTheCountsDAO getTheCountsDAO = new GetTheCountsDAO();
    try {
        int excelCount = getTheCountsDAO.getTotalFromExcel();
        int DAOCount = getTheCountsDAO.getTotalFromDB();
        request.setAttribute("DAOCount", DAOCount);
        request.setAttribute("excelCount", excelCount);
        request.getRequestDispatcher("counts.jsp").forward(request, response);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

请让我知道我哪里出错了，怎么才打印一次。

由于

Answer 1

使用此代码
此代码可以帮助您打印每行中列值的总和并返回列数。

while(rs1.next())
{

        timeTaken = rs1.getFloat("timeTaken");
         System.out.println("Time taken s " + timeTaken);
}

return DBCount;

列总和以行大小打印

1 个答案: