PreparedStatement 最大查询，参数未在 Java 中执行

Posted 2023-02-24

【中文标题】PreparedStatement 最大查询，参数未在 Java 中执行

【英文标题】：PreparedStatement Largest Query with Parameter Not Executing in Java

【发布时间】：2017-09-29 23:32:48

【问题描述】：

我正在尝试执行一个最大的 SQL 并使用 6 个日期参数并显示在 JTable 但它没有执行，我不知道实际问题是什么。

但令人困惑的是我能够使用Statement接口执行具有固定参数的相同查询并显示在JTable中，但无法使用PreparedStatement显示

我的源代码：

public String start_date;
    public String end_date;

    public void getMonthWithDropCombobox()
    
        if(month_sands.getSelectedIndex() != -1)
            int monthnumber = month_sands.getSelectedIndex() + 1;

             if(monthnumber>=9)
             
                 month=String.valueOf(monthnumber);

             else
             
                 month="0"+String.valueOf(monthnumber);
             

        

        String dateString = year_sands.getSelectedItem().toString()+"-"+month+"-"+"01";   
        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd", Locale.US); 
        LocalDate date = LocalDate.parse(dateString, dateFormat);
        LocalDate startDate=date.withDayOfMonth(1);
        LocalDate endDate = date.withDayOfMonth(date.getMonth().maxLength());

        start_date=startDate.toString();
        end_date=endDate.toString();


    

    public void getAllVendorDetails()
    
        getMonthWithDropCombobox();

        StockAndSales sas1=new StockAndSales();
        if(company_dropdown_sas.getSelectedItem().equals("View All Vendors"))
        

            try 


                String totalStockAndSales="select '' as Vendor_Company, '', product, price,sellprice, openingstock as openingStock, "
                + "openingstock*price as op_value, receipts as receipts, receipts*price as re_value, totalstock as totalstock, "
                + "totalstock*price as ts_value, sales as sales, sales*sellprice as s_value, return as returns,return*sellprice "
                + "as rt_value, closingstock as closingstock, closingstock*price as cl_value from purchase_table where date "

                + "between ? and ? "

                + "union all select orgname , 'TOTAL', '', sum(price),sum(sellprice), sum(openingstock) as openingStock, "
                + "sum(openingstock*price) as op_value, sum(receipts) as receipts, sum(receipts*price) as re_value, sum(totalstock) "
                + "as totalstock, sum(totalstock*price) as ts_value, sum(sales) as sales, sum(sales*sellprice) as s_value, sum(return) "
                + "as returns,sum(return*sellprice) as rt_value, sum(closingstock) as closingstock, sum(closingstock*price) as cl_value "
                + "from purchase_table where date "

                + "between ? and ? "

                + "group by orgname union all select 'Grand Total' , '', '',sum(price),sum(sellprice), sum(openingstock) as "
                + "openingStock, sum(openingstock*price) as op_value, sum(receipts) as receipts, sum(receipts*price) as re_value, "
                + "sum(totalstock) as totalstock, sum(totalstock*price) as ts_value, sum(sales) as sales, sum(sales*sellprice) as "
                + "s_value, sum(return) as returns,sum(return*sellprice) as rt_value, sum(closingstock) as closingstock, "
                + "sum(closingstock*price) as cl_value from purchase_table where date "

                + "between ? and ? "

                + "orde0r by closingstock asc";



            PreparedStatement ps_tsas=connection.prepareStatement(totalStockAndSales);
            ps_tsas.setString(1, start_date);
            ps_tsas.setString(2, end_date);
            ps_tsas.setString(3, start_date);
            ps_tsas.setString(4, end_date);
            ps_tsas.setString(5,start_date);
            ps_tsas.setString(6, end_date);

            ResultSet set_tsas=ps_tsas.executeQuery();
            sas1.table_sas.setModel(DbUtils.resultSetToTableModel(set_tsas));
            sas1.show_month_year_sas.setText("All Vendors Stock and Sales");
            sas1.name_of_user.setText(user_name_display.getText());
            sas1.setVisible(true);
            return;
         catch (Exception e) 
            // TODO: handle exception
        
        

    

【问题讨论】：

不要只吞下异常（// TODO：处理异常）。至少打印出异常消息+堆栈跟踪。有了异常消息，帮助也容易得多（假设抛出异常）

查询中日期的字符串表示可能与数据库端的预期格式不匹配。尝试使用PreparedStatement 的setDate(int parameterIndex, java.sql.Date) 方法。

【参考方案1】：

日期用setDate() 代替setString()：

ps_tsas.setDate(1, java.sql.Date.valueOf(start_date));

以实际日期为例：

ps_tsas.setDate(1, java.sql.Date.valueOf("2017-05-22"));

其他日期相同。

【讨论】：

我不知道如何感谢你，但我真的很高兴你帮助了我，这对我有用 +1，但我在这里有点困惑，在我之前的所有准备好的声明中，我使用了 setString对于它工作的所有日期参数，但为什么它不适用于这个特定的查询。任何合理的答案