Question

我正在读取XML文件并根据XML文件的元素保存提取的数据。我正在使用XmlReader。但是当我运行程序时...它运行得很精细但是只有NULL值被发送到我的数据库中。我的代码如下：

 using System;
using System.Xml;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;


public partial class _Default : System.Web.UI.Page
{



    string org_id;
    string org_desig;
    string org_name;
    string add_1;
    string add_2;
    string add_3;
    string cityname;
    string countrycode;
    string countryname;
    string postalcode;
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {

        //  Load the XML file
        XmlTextReader reader = new XmlTextReader("PXMLF-8612013050420130606105906.xml");

        //  Loop over the XML file
        while (reader.Read())
        {
            //  look for element
            if (reader.NodeType == XmlNodeType.Element)
            {
                //  If the element is the one required
                if (reader.Name == "OrganizationID")
                {
                    org_id = (reader.ReadElementString());

                }

                if (reader.Name == "OrganisationDesignator")
                    {

                        org_desig = (reader.ReadElementString());
                    }

                if (reader.Name == "OrganizationName1")
                    {

                        org_name = (reader.ReadElementString());
                    }

                if (reader.Name == "AddressLine1")
                    {

                        add_1 = (reader.ReadElementString());
                    }

                if (reader.Name == "AddressLine2")
                    {

                        add_2 = (reader.ReadElementString());
                    }

                if (reader.Name == "AddressLine3")
                    {

                        add_3 = (reader.ReadElementString());
                    }

                if (reader.Name == "CityName")
                    {

                         cityname = (reader.ReadElementString());
                    }

                if (reader.Name == "CountryCode")
                    {

                        countrycode = (reader.ReadElementString());
                    }
                if (reader.Name == "CountryName")
                    {

                        countryname = (reader.ReadElementString());
                    }
                if (reader.Name == "PostalCode")
                    {

                        postalcode = (reader.ReadElementString());
                    }



            //populate table data from extracted values

            //connect to db
            string connStr = ConfigurationManager.ConnectionStrings["connXML"].ConnectionString;
            SqlConnection con = new SqlConnection(connStr);
            con.Open();

            //send extracted data to db
            SqlCommand cmd = new SqlCommand();
            cmd.CommandText = "insert into INV_HEADER VALUES ('" + org_id + "','" + org_desig + "', '" + org_name + "' , '" + add_1 + "', '" + add_2 + "', '" + add_3 + "', '" + cityname + "', '" + countrycode + "', '" + countryname + "', '" + postalcode + "')";
            cmd.CommandType = CommandType.Text;
            cmd.Connection = con;
            cmd.ExecuteNonQuery();
            con.Close();
            reader.Close();
            }

        }

Answer 1

看起来像reader.Read（）方法只循环一次迭代。为什么不在调试模式下运行它并查看变量是否实际设置为从Xml节点检索的值？如果他们正确地获取值，那么接下来要做的就是检查你的CommandText。从CommandText复制SQL语句并将其粘贴到SQL Server Management Studio并运行它以查看它是否实际插入记录（假设您使用的是SQL Server）。

Answer 2

似乎您在每个reader.Read（）之后插入值。尝试在while循环后插入。

using System;
using System.Xml;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;


public partial class _Default : System.Web.UI.Page
{
    string org_id;
    string org_desig;
    string org_name;
    string add_1;
    string add_2;
    string add_3;
    string cityname;
    string countrycode;
    string countryname;
    string postalcode;

    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        //  Load the XML file
        XmlTextReader reader = new XmlTextReader("PXMLF-8612013050420130606105906.xml");

        //  Loop over the XML file
        while (reader.Read())
        {
            //  look for element
            if (reader.NodeType == XmlNodeType.Element)
            {
                //  If the element is the one required
                switch (reader.Name)
                {
                    case "OrganizationID":
                        org_id = (reader.ReadElementString());
                        break;
                    case "OrganisationDesignator":
                        org_desig = (reader.ReadElementString());
                        break;
                    case "OrganizationName1":
                        org_name = (reader.ReadElementString());
                        break;
                    case "AddressLine1":
                        add_1 = (reader.ReadElementString());
                        break;
                    case "AddressLine2":
                        add_2 = (reader.ReadElementString());
                        break;
                    case "AddressLine3":
                        add_3 = (reader.ReadElementString());
                        break;
                    case "CityName":
                        cityname = (reader.ReadElementString());
                        break;
                    case "CountryCode":
                        countrycode = (reader.ReadElementString());
                        break;
                    case "CountryName":
                        countryname = (reader.ReadElementString());
                        break;
                    case "PostalCode":
                        postalcode = (reader.ReadElementString());
                        break; 
                }
            }
        }

        //connect to db
        string connStr = ConfigurationManager.ConnectionStrings["connXML"].ConnectionString;
        SqlConnection con = new SqlConnection(connStr);
        con.Open();

        //send extracted data to db
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = "insert into INV_HEADER VALUES ('" + org_id + "','" + org_desig + "', '" + org_name +
                          "' , '" + add_1 + "', '" + add_2 + "', '" + add_3 + "', '" + cityname + "', '" +
                          countrycode + "', '" + countryname + "', '" + postalcode + "')";
        cmd.CommandType = CommandType.Text;
        cmd.Connection = con;
        cmd.ExecuteNonQuery();
        con.Close();
        reader.Close();
    }
}

C＃中的NULL值已插入数据库中

2 个答案: