Question

您好我正在尝试执行查询，将数据从一个表复制到另一个表，即project.purchaseorder到project.processingactualgrn 我试过的MySQL查询如下：

插入project.processingactualgrn （PONo，PODate，OrderingQty，ReceivedQty，BalanceQty）选择 PONO，PODate，Quantity AS OrderingQty，（Quantity-（Quantity-2））AS 来自project.purchaseorder的ReceivedQty，（Quantity-2）AS BalanceQty 其中PONo = 1212;

在上面的查询中，我使用了值

在程序中我使用了使用PreparedStatement的占位符执行了查询，用户输入的值ex-(Quantity-2) AS BalanceQty in this '2'必须存储在数据库中

protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
RequestDispatcher rd = null;

String pno = request.getParameter("PONo");
int p = Integer.parseInt(pno);
String receivedQty1 =request.getParameter("ReceivedQty1");
int Rqty1= Integer.parseInt(receivedQty1);
String receivedQty2 =request.getParameter("ReceivedQty2");
int Rqty2= Integer.parseInt(receivedQty2);

Connection conn = null;
try {
    Class.forName("com.mysql.jdbc.Driver");
    conn = DriverManager.getConnection("jdbc:mysql://localhost:3306", "root", "dinga");

    PreparedStatement ps = conn.prepareStatement("Insert into project.processingactualgrn (PODate,PONo,OrderingQty,ReceivedQty,BalanceQty) Select PODate,PONo,Quantity AS OrderingQty,(Quantity-(Quantity-?) )AS ReceivedQty,(Quantity-?) AS BalanceQty  from project.purchaseorder where PONo=?");
    ps.setInt(1,Rqty1);
    ps.setInt(2,Rqty2);
    ps.setInt(3,p);
    System.out.println("value of ps"+ps);
    int rs = ps.executeUpdate();
    System.out.println("value of ps"+ps);
    if(rs!=0){
        rd = request.getRequestDispatcher("view/sucess.html");
        rd.forward(request, response);
    }

} catch (SQLException e) {
} catch (ClassNotFoundException e) {
} finally {
    try {
        if (conn != null) {
            conn.close();
        }
    } catch (SQLException ex) {
    }
}
}
}

将数据从一个表复制到另一个表并存储数据

0 个答案: