Question

我在Java NetBeans中遇到了一些高级搜索问题。该特定区域的代码不是由我制作的，而是我试图纠正它。 clieninput，productinput和truckinput无效。他们找不到任何东西，或者只展示一些记录。

其他2个工作正常，一个只是数字，另一个是日期，是否与任何事情有关？

该部分的代码是：

private void generarButtonActionPerformed(java.awt.event.ActionEvent evt) {
    try {
        model.getRows().clear();
        String sql = "SELECT id_scale_load, ticket_number, customer_code, customer_name, product_code, " +
                "product_name, truck_code, truck_name, tagid, tare, gross, (gross - tare) " +
                "AS net, ash, btu, mustuire, sulfur, fin FROM scale_load " +
                "WHERE (ticket_number = ? OR ? = true)AND(customer_name LIKE ? OR ? = true) " +
                "AND (date(fin) = ? OR ? = true) AND(product_name LIKE ? OR ? = true) " +
                "AND(truck_code LIKE ? OR > ? = true) ";

        pst = conn.prepareStatement(sql);

        if (!ticketInput.getText().isEmpty()) {
            pst.setString(1, ticketInput.getText());
            pst.setBoolean(2, false);
        } else {
            pst.setString(1, "");
            pst.setBoolean(2, true);
        }

        if (!clientInput.getText().isEmpty()) {
            pst.setString(3, "'" + clientInput.getText() + "'");
            pst.setBoolean(4, false);
        } else {
            pst.setString(3, "");
            pst.setBoolean(4, true);
        }

        if (dateInput.getDate() != null) {
            pst.setDate(5, new java.sql.Date(dateInput.getDate().getTime()));
            pst.setBoolean(6, false);
        } else {
            pst.setString(5, null);
            pst.setBoolean(6, true);
        }

        if (!productInput.getText().isEmpty()) {
            pst.setString(7, "'" + productInput.getText() + "%'");
            pst.setBoolean(8, false);
        } else {
            pst.setString(7, "");
            pst.setBoolean(8, true);
        }

        if (!truckInput.getText().isEmpty()) {
            pst.setString(9, "'" + truckInput.getText() + "%'");
            pst.setBoolean(10, false);
        } else {
            pst.setString(9, "");
            pst.setBoolean(10, true);
        }
        rs = pst.executeQuery();
        printButton.setEnabled(true);

        ResultSetMetaData meta = rs.getMetaData();
        while (rs.next()) {
            Ticket row = new Ticket();
            row.setNo(rs.getInt(1));
            row.setTicket(rs.getInt(2));
            row.setCustomerCode(rs.getString(3));
            row.setCustomerName(rs.getString(4));
            row.setProductCode(rs.getString(5));
            row.setProductName(rs.getString(6));
            row.setTruckCode(rs.getString(7));
            row.setTruckName(rs.getString(8));
            row.setTagID(rs.getString(9));
            row.setGross(rs.getInt(10));
            row.setTare(rs.getInt(11));
            row.setNet(rs.getInt(12));
            row.setAsh(rs.getDouble(13));
            row.setBtu(rs.getInt(14));
            row.setMustuire(rs.getDouble(15));
            row.setSulfure(rs.getDouble(16));
            row.setDate(new Date(rs.getDate(17).getTime()));
            model.addRow(row);
        }
        model.refresh();
        //ticketInput.setText("");
        printTicketButton.setEnabled(false);
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);

    }
}

代码中有错误吗？

Answer 1

您没有提供太多信息，但看起来有些错误：当您提供查询参数时，您会单引号，但是当您没有提供参数时，您会使用＆＃34;＆＃ 34;，我认为这会导致SQL语法错误

带有提供值的版本将创建一个如下所示的（正确）行：

(product_name LIKE 'Product' OR false = true)

vs不提供应该创建这样一行的行：

(product_name LIKE OR true = true)
                  ^ SQL Wants something here, even if true=true!

难道第二个问题不是吗？尝试将其默认为＆＃34; ＆＃39; ＆＃39; ＆＃34;而不是＆＃34;＆＃34;得到：

(product_name LIKE '' OR true = true)

Java NetBeans中的高级搜索问题

1 个答案: