使用以下

SQL查询创建数据库

Create Database Feed
;
GO

USE [Feed]
drop table Doc
drop table Links
;
GO

CREATE TABLE [dbo].[Doc](
   DocID int primary key,
   Title [varchar](50) NULL,
   URL [varchar](50) NULL,
   Abstract [varchar](50) NULL
)

CREATE TABLE Links(
   DocID int, 
   LinkType [varchar](10) NULL,
   Anchor [varchar](50) NULL, 
   Link [varchar](50) NULL
   CONSTRAINT FK_DocID FOREIGN KEY (DocID)
        REFERENCES dbo.Doc (DocID)
)

C＃代码从xml填充数据库

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.Data;
using System.Data.SqlClient;

namespace ConsoleApplication1
{
    class Program
    {
        const string FILENAME = @"c:\temp\test.xml";
        const string CONNECTION_STRING = @"Server=.\SQLEXPRESS;Database=Feed;Trusted_Connection=True;";
        const string INSERT_DOC =
            "INSERT INTO [Feed].[dbo].[Doc] (" +
            "DocID, Title , URL, Abstract)" +
            " VALUES " +
            "(@DocID, @Title, @URL, @Abstract)";
        const string INSERT_LINK =
            "INSERT INTO [Feed].[dbo].[Links] (" +
            "DocID, LinkType , Anchor, Link)" +
            " VALUES " +
            "(@DocID, @Linktype, @Anchor, @Link)";

        static void Main(string[] args)
        {
            SqlConnection conn = new SqlConnection(CONNECTION_STRING);
            conn.Open();

            SqlCommand docCmd = new SqlCommand(INSERT_DOC, conn);

            docCmd.Parameters.Add("@DocID", SqlDbType.Int);
            docCmd.Parameters.Add("@Title", SqlDbType.VarChar, 50);
            docCmd.Parameters.Add("@URL", SqlDbType.VarChar, 50);
            docCmd.Parameters.Add("@Abstract", SqlDbType.VarChar, 50);

            SqlCommand linksCmd = new SqlCommand(INSERT_LINK, conn);

            linksCmd.Parameters.Add("@DocID", SqlDbType.Int);
            linksCmd.Parameters.Add("@LinkType", SqlDbType.VarChar, 10);
            linksCmd.Parameters.Add("@Anchor", SqlDbType.VarChar, 50);
            linksCmd.Parameters.Add("@Link", SqlDbType.VarChar, 50);

            XmlReader reader = XmlReader.Create(FILENAME);
            int id = 0;
            while (!reader.EOF)
            {
                if (reader.Name != "doc")
                {
                    reader.ReadToFollowing("doc");
                }
                if (!reader.EOF)
                {
                    XElement doc = (XElement)XElement.ReadFrom(reader);
                    id++;

                    docCmd.Parameters["@DocID"].Value = id;
                    docCmd.Parameters["@Title"].Value = (string)doc.Element("title");
                    docCmd.Parameters["@URL"].Value = (string)doc.Element("url");
                    docCmd.Parameters["@Abstract"].Value = (string)doc.Element("abstract");
                    int docRowsChanged = docCmd.ExecuteNonQuery();

                    foreach (XElement sublink in doc.Descendants("sublink"))
                    {
                        linksCmd.Parameters["@DocID"].Value = id;
                        linksCmd.Parameters["@LinkType"].Value = (string)sublink.Attribute("linktype");
                        linksCmd.Parameters["@Anchor"].Value = (string)sublink.Element("anchor");
                        linksCmd.Parameters["@Link"].Value = (string)sublink.Element("link");
                        int linksRowsChanged = linksCmd.ExecuteNonQuery();
                    }

                }
            }
        }
    }
}