在PHP查询中使用MSSQL STUFF

Question

因此，首先让我解释一下我要做什么，然后我要如何做，然后是问题出在哪里。 我正在尝试创建mssql查询以从数据库中读取发票。 每张发票本质上都是按发票ID分组在一起的单个费用的汇总。 结果是，不同的费用可能来自不同的容器（费用与容器相关）。 我需要做的是按发票ID对费用进行分组，并用诸如“ |”之类的分隔符来连接发票中所有费用的容器名称。 我创建了一个临时表@t，其中包含生成发票所需的所有费用和容器名称。 在网上寻找了一段时间之后，我发现了STUFF命令，该命令似乎可以执行我想要的操作（出现并执行）。 所以这是我查询的SQL：

select invoice_id, [Total Paid] RefNumCount,PayCount, MIN([rowNumber]) as rowNumber,     Vendor, Due, [Invoice Number], Company, MAX(Location) as Location,
 SUM([Funded Amount]) as [Funded Amount], 
 [Company ID], [Invoice ID], provider_reference_number, reconcile_date, all_providers
, STUFF(
        (
        select '|' + t1.[Container Name]
        from @t t1
        where t1.[Invoice Number] = t.[Invoice Number]
        order by t1.[Container Name]
        for XML PATH(''), TYPE
        ).value('.', 'nvarchar(100)')
        ,1,1,''
     ) as [Container Name] 

from @t t
group by invoice_id, [Total Paid], RefNumCount, PayCount, Vendor, Due, [Invoice Number], Company, 
    [Company ID], [Invoice ID], provider_reference_number, reconcile_date, all_providers

当我运行的是SQL Server Management Studio 2008时，它运行得很好。 但是，当我在PHP应用程序中使用此代码时，查询不起作用，并且最终由于尝试读取空结果集而导致致命错误。 有人知道为什么会发生此问题吗？ 或者，如果还有另一种串联字符串的方法？

以下是用于调用查询的PHP代码段

           try{
                $q = cms_database::instance();
                 $result = $q->query($sql_statement);        
                 if (!$result) {
                       throw new Exception("Database Error [{$q->errno}] {$q->error}");
                  } 

                $invoices = array();
                while($row=$result->fetch_assoc()) {
                    $invoiceX = array();
                    $invoiceX["rowNum"]     = $row["rowNumber"];
                    $invoiceX["Vendor"]     = $row["Vendor"];
                    $invoiceX["Due"]        = $row["Due"];
                    $invoiceX["Acct"]       = $row["Container Name"];//$row["Account Number"];
                    $invoiceX["container_id"]=$row["container_id"];
                    $invoiceX["provider_id"] =$row["provider_id"];
                    $invoiceX["Invoice"]    = $row["Invoice Number"];
                    $invoiceX["Location"]   = $row["Company"];
                    $invoiceX["FundedAmt"]  = $row["Funded Amount"];
                    $invoiceX["InvoiceID"]  = $row["Invoice ID"];
                    $invoiceX["Notes"]      = $row["Notes"];
                    //merge the notes with notes from payment history that matches the invoiceid


                    $invoices[] = $invoiceX;
                }

                //filter out invoices with all reference numbers accounted for and remaining to be paid is $0.00



                $returnPackage["data"] = $invoices;
                //print $result;
            } catch (Exception $e){
                $returnPackage["success"]=0;
                $returnPackage["message"]=$e.message;

            }

我得到的错误是：
致命错误 ：在第116行的D：[path_to_the_file] .php中的非对象上调用成员函数fetch_assoc（）
“

第116行是代码行

while($row=$result->fetch_assoc()) {

Answer 1

尽管这可能会晚一点，但是请尝试使用此SQL调用。

select invoice_id, [Total Paid] RefNumCount,PayCount, MIN([rowNumber]) as rowNumber, 
       Vendor, Due, [Invoice Number], Company, MAX(Location) as Location,
       SUM([Funded Amount]) as [Funded Amount], [Company ID], [Invoice ID],
       provider_reference_number, reconcile_date, all_providers , 
       STUFF((select '|' + t1.[Container Name]
              from @t t1
              where t1.[Invoice Number] = t.[Invoice Number]
              order by t1.[Container Name]
              for XML PATH('')),1,1,'') as [Container Name] 
from @t t
group by invoice_id, [Total Paid], RefNumCount, PayCount, Vendor, Due, [Invoice Number], 
         Company, [Company ID], [Invoice ID], provider_reference_number, reconcile_date, 
         all_providers

当您添加“ |”时发生错误 在下面的select语句中，它将剥离xml标记，当您使用.value（）尝试提取数据时会导致错误。

STUFF((select '|' + ... from ... for XML PATH(''), TYPE).value('.', 'nvarchar(100)'),1,1,'')