未捕获的 SoapFault 异常：[soapenv:Server] 在结果集开始之前

Question

我正在为电子商务网站开发一个 Web 服务，我正在将所有基于 supplier_id 的产品从 java 返回到 php 客户端，但它给了我这个错误

Fatal error: Uncaught SoapFault exception: [soapenv:Server] Before start of result set in C:\wamp\www\eshop\viewProductsSupplier.php:194 Stack trace: #0 C:\wamp\www\eshop\viewProductsSupplier.php(194): SoapClient->__soapCall('viewProducts', Array) #1 {main} thrown in C:\wamp\www\eshop\viewProductsSupplier.php on line 194

我已经尝试检查查询是否执行，但一切正常

//php代码

$soapclient = new SoapClient('http://localhost:8090/Eshop_ecommerce/services/Eshop_ecommerce?wsdl', ['trace' => 1]);
            session_start();
            $id=array('id'=>@$_SESSION['supplierId']);
            $response=$soapclient->__soapCall("viewProducts",$id);
            if (isset($response->Name))
            {
                print $response;
            }
            else
            {
                print "Data is null";
            }

//Java代码

ViewProductsResponse res = new ViewProductsResponse();
                Class.forName(driver);
                conn = DriverManager.getConnection(url,username,password);
                stmt = conn.createStatement();
                String Query=null;
                String in=viewProducts.getViewProductsRequest();
                if(!in.isEmpty())
                {
                    Query="SELECT * FROM product";
                }
                else
                {
                    Query="SELECT * FROM product WHERE product_supplier_id='"+viewProducts.getViewProductsRequest()+"'";
                }
                ProductArray pa=new ProductArray();
                ResultSet result= stmt.executeQuery(Query);
                //System.out.println(result);
                while(result.next())
                {
                    Product p= new Product();
                    //System.out.println(result.getString("product_id"));
                    p.setId(result.getString("product_id"));
                    p.setName(result.getString("product_name"));
                    p.setPrice(result.getString("product_price"));
                    p.setStock(result.getString("product_stock"));
                    String supplierNameQuery="SELECT supplier_id,supplier_name FROM supplier WHERE supplier_id='"+result.getString("product_supplier_id")+"'";
                    ResultSet resultSupplierName = stmt.executeQuery(supplierNameQuery);
                    p.setSupplierName(resultSupplierName.getString("supplier_name"));
                    String catQuery="SELECT * FROM product_category WHERE category_id='"+result.getString("product_category_id")+"'";
                    ResultSet resCat= stmt.executeQuery(catQuery);
                    p.setCategoryName(resCat.getString("category_name"));
                    pa.setProduct(p);
                    res.setProducts(pa);
                }
                //res.setViewProductsResponse("Data Entered");
                return res;

我希望它打印所有生成的产品

Answer 1

一个ResultSet returned from Statement#executeQuery is positioned before the first row (see linked-in JavaDoc). In order for such ResultSet to point to the first row it needs re-positioned to it, for example using the next()方法。这是针对外部 SELECT 而不是针对两个内部的。此外，需要检查来自 next() 调用的 return 值，以查看 ResultSet.

中是否有任何行

这可以像这样实现：

 if(resultSupplierName.next()) {
     p.setSupplierName(resultSupplierName.getString("supplier_name"));
 }
 if(resCat.next()) {
     p.setCategoryName(resCat.getString("category_name"));
 }

请注意，发布的代码还有其他未解决的问题，例如 JDBC 资源未关闭。我强烈建议查看 JEE 或 Spring（假设代码显然在应用程序服务器中运行）或至少在 this. Further is the code prone to SQL injection

未捕获的 SoapFault 异常：[soapenv:Server] 在结果集开始之前

Uncaught SoapFault exception: [soapenv:Server] Before start of result set

java

php

soap

resultset

soap-client