[以下是几乎完整的代码修改。目前在阅读时显示非法字符错误]。
我有一个C＃ASP.NET应用程序，它正在从文件系统读取XML文件，然后将其加载到GridView控件中。在网格中我可以删除行。网格下方还有一个文件上传按钮，用于上传PDF文件并显示在网格中。我的代码基本上是this code
的修改版本我的下一阶段工作涉及从数据库字段中读取XML数据作为String，而不是从XML文件中读取。为此，我想我可以从XML文件中读取，在aspx页面中进行更改，并将“数据集”写入名为“PDF_Storage”的数据库字段。我怎样才能做到这一点。至关重要的是，我需要能够将数据集转换为某种字符串格式进行存储。这是我的代码片段。
我的数据库是Oracle 10，但我可以找出Update sql语法。
示例XML文件：
<DataSet>
<PDF>
<pdf>MyPDF1.pdf</pdf>
</PDF>
<PDF>
<pdf>MyPDF2.pdf</pdf>
</PDF>
<PDF>
<pdf>MyPDF3.pdf</pdf>
</PDF>
</DataSet>
以及相应的代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using Oracle.DataAccess.Client;
using System.Web.Configuration;
using System.IO;
using System.Xml;
using System.Text.RegularExpressions;
public partial class XMLGridTest : System.Web.UI.Page
{
public static string GetConnString()
{
return WebConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
binddata();
}
}
void binddata()
{
DataSet ds = new DataSet();
// ds.ReadXml(Server.MapPath("testxml.xml"));
String strConnect = GetConnString();
OracleConnection oracleConn = new OracleConnection();
oracleConn.ConnectionString = strConnect;
oracleConn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = oracleConn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT PDF_Storage FROM CampusDev.CU_POLY WHERE OBJECTID = " + Request.QueryString["OBJECTID"];
OracleDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
if (!reader.IsDBNull(0))
{
//## Line Below as the 'illegal characters' problem###
ds.ReadXml(reader[0].ToString(), XmlReadMode.IgnoreSchema);
gv.DataSource = ds;
gv.DataBind();
}
else
{
// Response.Write(reader.GetString(1));
// TextBox1.Text = reader.GetString(1);
}
}
// gv.DataSource = ds;//##Hard coded for XML. Works!
// gv.DataBind();
//Finally, close the connection
oracleConn.Close();
}
protected void Canceldata(object s, GridViewCancelEditEventArgs e)
{
gv.EditIndex = -1;
binddata();
}
protected void pageddata(object s, GridViewPageEventArgs e)
{
gv.PageIndex = e.NewPageIndex;
binddata();
}
protected void insert(object sender, EventArgs e)
{
/////////////////////////////////File Upload Code/////////////////////////////////
// Initialize variables
string sSavePath = "ParcelPDF/"; ;
if (fileupload.PostedFile == null)
{
Label1.Text = "Must Upload a PDF file!";
return;
}
HttpPostedFile myFile = fileupload.PostedFile;
int nFileLen = myFile.ContentLength;
// Check file extension (must be JPG)
if (System.IO.Path.GetExtension(myFile.FileName).ToLower() != ".pdf")
{
Label1.Text = "The file must have an extension of .pdf";
return;
}
// Read file into a data stream
byte[] myData = new Byte[nFileLen];
myFile.InputStream.Read(myData, 0, nFileLen);
// Make sure a duplicate file doesn’t exist. If it does, keep on appending an incremental numeric until it is unique
string sFilename = System.IO.Path.GetFileName(myFile.FileName);
int file_append = 0;
while (System.IO.File.Exists(Server.MapPath(sSavePath + sFilename)))
{
file_append++;
sFilename = System.IO.Path.GetFileNameWithoutExtension(myFile.FileName) + file_append.ToString() + ".pdf";
}
// Save the stream to disk
System.IO.FileStream newFile = new System.IO.FileStream(Server.MapPath(sSavePath + sFilename), System.IO.FileMode.Create);
newFile.Write(myData, 0, myData.Length);
newFile.Close();
binddata();
DataSet ds = gv.DataSource as DataSet;
DataRow dr = ds.Tables[0].NewRow();
// dr[0] = pdf.Text;
dr[0] = sFilename.ToString();
ds.Tables[0].Rows.Add(dr);
ds.AcceptChanges();
string blah = "blah";
Response.Write(ds.Tables.ToString());
// ds.WriteXml(Server.MapPath("testxml.xml"));
String strConnect = GetConnString();
OracleConnection oracleConn = new OracleConnection();
oracleConn.ConnectionString = strConnect;
oracleConn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = oracleConn;
cmd.CommandType = CommandType.Text;
// cmd.CommandText = "SELECT OBJECTID,COMMENTS FROM CampusDev.CU_POLY WHERE OBJECTID = " + Request.QueryString["OBJECTID"];
cmd.CommandText = "UPDATE CampusDev.CU_POLY SET PDF_Storage = :PDF_Storage WHERE OBJECTID = " + Request.QueryString["OBJECTID"];
StringWriter SW = new StringWriter();
ds.WriteXml(SW);
cmd.Parameters.Add(":PDF_Storage", SW.ToString());
cmd.ExecuteNonQuery();
oracleConn.Close();
binddata();
}
protected void Deletedata(object s, GridViewDeleteEventArgs e)
{
binddata();
DataSet ds = gv.DataSource as DataSet;
ds.Tables[0].Rows[gv.Rows[e.RowIndex].DataItemIndex].Delete();
// ds.WriteXml(Server.MapPath("testxml.xml"));//Disabled now. Do database. Irfan. 07/09/10
String strConnect = GetConnString();
OracleConnection oracleConn = new OracleConnection();
oracleConn.ConnectionString = strConnect;
oracleConn.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = oracleConn;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "UPDATE CampusDev.CU_POLY SET PDF_Storage = :PDF_Storage WHERE OBJECTID = " + Request.QueryString["OBJECTID"];
StringWriter SW = new StringWriter();
ds.WriteXml(SW,XmlWriteMode.IgnoreSchema);
Regex regex = new Regex(@"(\r\n|\r|\n)+");
string newText = regex.Replace(SW.ToString(), "");
cmd.Parameters.Add(":PDF_Storage", newText);
cmd.ExecuteNonQuery();
oracleConn.Close();
binddata();
string blah = "blah";
}
答案 0 :(得分：0)
以下是我过去的做法。对于插入，您基本上只需将数据集的xml表示写入字符串并将其直接保存到数据库中的字段。在这种情况下，我利用Sql Server 2008和数据库字段的XML数据类型。我认为Oracle中的数据类型是XMLTYPE。
插入
public static void InsertDataSet(string key, DataSet dataSet)
{
string xml = string.Empty;
using (MemoryStream ms = new MemoryStream())
{
dataSet.WriteXml(ms, XmlWriteMode.WriteSchema);
ms.Position = 0;
using (StreamReader sr = new StreamReader(ms))
{
xml = sr.ReadToEnd();
}
using (SqlServerConnection c = new SqlServerConnection(connectionString))
{
c.command.CommandType = CommandType.StoredProcedure;
c.command.CommandText = "some stored procedure to do the insert";
c.command.Parameters.Clear();
c.command.Parameters.Add(new SqlParameter("@key", key));
c.command.Parameters.Add(new SqlParameter("@xml", xml));
c.command.ExecuteNonQuery();
}
}
}
将数据集从数据库中取出就像将数据库中的xml数据读回TextReader，然后构建新的DataSet一样简单。
获取：
public static DataSet GetDataSet(string key)
{
using (SqlServerConnection c = new SqlServerConnection(connectionString))
{
c.command.CommandType = CommandType.StoredProcedure;
c.command.CommandText = "some stored procedure to get the xml";
c.command.Parameters.Clear();
c.command.Parameters.Add(new SqlParameter("@key", key));
dr = c.command.ExecuteReader();
if (dr == null)
{
return null;
}
if (dr.HasRows)
{
while (dr.Read())
{
if (dr["xml_field"] != DBNull.Value)
{
TextReader tr = new StringReader(dr["xml_field"].ToString());
result = new DataSet();
result.ReadXml(tr, XmlReadMode.ReadSchema);
}
}
}
}
return result;
}
希望这有帮助。
享受！