Showing image in GridView from the database? - asp.net

I have images saved in SQL server database as a binary data. Now I want to show these images in the Gridview. But there web control which directly read the data from the database. Web image control requires ImageUrl property so can not use this as my images are in databases. However i can store the images in a folder but i want some different way which directly read image data from the database and show in a grid.

using generic handler you can convert binary data into image and display it
Code:
Set image control url as
Image1.ImageUrl = "~/ShowImage.ashx?id=" + id;
where ShowImage.ashx is a generic handler file.
using System;
using System.Configuration;
using System.Web;
using System.IO;
using System.Data;
using System.Data.SqlClient;
public class ShowImage : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
Int32 empno;
if (context.Request.QueryString["id"] != null)
empno = Convert.ToInt32(context.Request.QueryString["id"]);
else
throw new ArgumentException("No parameter specified");
context.Response.ContentType = "image/jpeg";
Stream strm = ShowEmpImage(empno);
byte[] buffer = new byte[4096];
int byteSeq = strm.Read(buffer, 0, 4096);
while (byteSeq > 0)
{
context.Response.OutputStream.Write(buffer, 0, byteSeq);
byteSeq = strm.Read(buffer, 0, 4096);
}
//context.Response.BinaryWrite(buffer);
}
public Stream ShowEmpImage(int empno)
{
string conn = ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString;
SqlConnection connection = new SqlConnection(conn);
string sql = "SELECT* FROM table WHERE empid = #ID";
SqlCommand cmd = new SqlCommand(sql,connection);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("#ID", empno);
connection.Open();
object img = cmd.ExecuteScalar();
try
{
return new MemoryStream((byte[])img);
}
catch
{
return null;
}
finally
{
connection.Close();
}
}
}

the blog may give you some help
http://hi.baidu.com/pxvddcbpbrbmqxq/item/3de72787e9e1c6eae496e098

Related

how to trim the white spaces in the output of json webservice asp.net

Hi (I'm new to JSON this is my 1st webservice)
I have created an Webservice in asp.net that returns JSON data.Every thing works fine but what i need is when fetching the data from the database it should trim the white spaces before it displays.
Because in my data base i have given the field type as nvarchar(100) but inserted the text with <20 characters so in the output i'm getting the result with whitespaces also
For eg:
{"Cargo":[{"Id":1,"FirstName":"devi ","LastName":"priya ","Contactno":"965577796 "}]}
after the name devi and priya there is lots if spaces.
But the actual result i supposed to get is;
{"Cargo":[{"Id":1,"FirstName":"devi","LastName":"priya ","Contactno":"965577796 "}]}
Here is my code;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Script.Serialization;
using System.Web.Script.Services;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.ComponentModel;
namespace Webservice
{
/// <summary>
/// Summary description for Service1
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
// [System.Web.Script.Services.ScriptService]
public class Service1 : System.Web.Services.WebService
{
public Service1()
{
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Json, XmlSerializeString = false)]
//public string GetEmployees(string SearchTerm)
public void GetEmployees()
{
try
{
System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["NSConstr"].ToString());
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "SELECT * FROM Contact e ";
DataSet ds = new DataSet();
DataTable dt = new DataTable();
SqlDataAdapter da = new SqlDataAdapter(cmd);
da.SelectCommand.Connection = con;
da.Fill(dt);
con.Close();
List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
Dictionary<string, object> row = null;
foreach (DataRow rs in dt.Rows)
{
row = new Dictionary<string, object>();
foreach (DataColumn col in dt.Columns)
{
row.Add(col.ColumnName, rs[col]);
}
rows.Add(row);
}
//return serializer.Serialize(rows);
//return "{ \"Cargo\": " + serializer.Serialize(rows) + "}";
//JavaScriptSerializer js = new JavaScriptSerializer();
//string strJSON = js.Serialize(new { Cargo = rows });
this.Context.Response.ContentType = "application/json; charset=utf-8";
this.Context.Response.Write(serializer.Serialize(new { Cargo = rows }));
//return serializer.Serialize(new { Cargo = rows });
}
catch (Exception ex)
{
//return errmsg(ex);
}
}
}
can any one please help me.
thanks in advance.
hi the following code helps me to trim the white spaces:
row.Add(col.ColumnName, rs[col].ToString().Trim());

saving a pdf to a sql database using itextsharp

I'm using this tutorial https://web.archive.org/web/20211020001747/https://www.4guysfromrolla.com/articles/030211-1.aspx that’s uses a PDF template, lets the user input fields using textbox's. The file downloads onto the client’s pc but I would like to save a copy of the file into a sql database also or just save the file in the database instead of both.
protected void btnGeneratePDF_Click(object sender, EventArgs e)
{
var pdfPath = Path.Combine(Server.MapPath("~/PDFTemplates/fw9.pdf"));
// Get the form fields for this PDF and fill them in!
var formFieldMap = PDFHelper.GetFormFieldNames(pdfPath);
formFieldMap["topmostSubform[0].Page1[0].f1_01_0_[0]"] = txtName.Text;
formFieldMap["topmostSubform[0].Page1[0].f1_02_0_[0]"] = txtBusinessName.Text;
if (rblTaxClassification.SelectedValue != null)
{
var formFieldName = string.Format("topmostSubform[0].Page1[0].c1_01[{0}]", rblTaxClassification.SelectedIndex);
formFieldMap[formFieldName] = (rblTaxClassification.SelectedIndex + 1).ToString();
}
if (chkExemptPayee.Checked)
formFieldMap["topmostSubform[0].Page1[0].c1_01[7]"] = "8";
formFieldMap["topmostSubform[0].Page1[0].f1_04_0_[0]"] = txtAddress.Text;
formFieldMap["topmostSubform[0].Page1[0].f1_05_0_[0]"] = txtCityStateZIP.Text;
formFieldMap["topmostSubform[0].Page1[0].f1_07_0_[0]"] = txtAccountNumbers.Text;
// Requester's name and address (hard-coded)
formFieldMap["topmostSubform[0].Page1[0].f1_06_0_[0]"] = "Acme Website\n123 Anywhere Lane\nSpringfield, USA";
// SSN
if (!string.IsNullOrEmpty(txtSSN1.Text))
{
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField1[0]"] = txtSSN1.Text;
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[0]"] = txtSSN2.Text;
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[1]"] = txtSSN3.Text;
}
else if (!string.IsNullOrEmpty(txtEIN1.Text))
{
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[2]"] = txtEIN1.Text;
formFieldMap["topmostSubform[0].Page1[0].social[0].TextField2[3]"] = txtEIN2.Text;
}
var pdfContents = PDFHelper.GeneratePDF(pdfPath, formFieldMap);
PDFHelper.ReturnPDF(pdfContents, "Completed-W9.pdf");
FileStream fs = new FileStream(pdfPath, FileMode.Open, FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
Byte[] bytes = br.ReadBytes((Int32)fs.Length);
br.Close();
fs.Close();
//insert the file into database
string strQuery = "insert into tblFiles(Name, ContentType, Data) values (#Name, #ContentType, #Data)";
SqlCommand cmd = new SqlCommand(strQuery);
cmd.Parameters.Add("#Name", SqlDbType.VarChar).Value = "Completed-W9132.pdf";
cmd.Parameters.Add("#ContentType", SqlDbType.VarChar).Value = "application/pdf";
cmd.Parameters.Add("#Data", SqlDbType.Binary).Value = bytes;
InsertUpdateData(cmd);
App_code/pdfHelper.cs
using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Web;
using System.IO;
using iTextSharp.text.pdf;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
public class PDFHelper
{
public static Dictionary<string, string> GetFormFieldNames(string pdfPath)
{
var fields = new Dictionary<string, string>();
var reader = new PdfReader(pdfPath);
foreach (DictionaryEntry entry in reader.AcroFields.Fields)
fields.Add(entry.Key.ToString(), string.Empty);
reader.Close();
return fields;
}
public static byte[] GeneratePDF(string pdfPath, Dictionary<string, string> formFieldMap)
{
var output = new MemoryStream();
var reader = new PdfReader(pdfPath);
var stamper = new PdfStamper(reader, output);
var formFields = stamper.AcroFields;
foreach (var fieldName in formFieldMap.Keys)
formFields.SetField(fieldName, formFieldMap[fieldName]);
stamper.FormFlattening = true;
stamper.Close();
reader.Close();
return output.ToArray();
}
// See http://stackoverflow.com/questions/4491156/get-the-export-value-of-a-checkbox-using-itextsharp/
public static string GetExportValue(AcroFields.Item item)
{
var valueDict = item.GetValue(0);
var appearanceDict = valueDict.GetAsDict(PdfName.AP);
if (appearanceDict != null)
{
var normalAppearances = appearanceDict.GetAsDict(PdfName.N);
// /D is for the "down" appearances.
// if there are normal appearances, one key will be "Off", and the other
// will be the export value... there should only be two.
if (normalAppearances != null)
{
foreach (var curKey in normalAppearances.Keys)
if (!PdfName.OFF.Equals(curKey))
return curKey.ToString().Substring(1); // string will have a leading '/' character, so remove it!
}
}
// if that doesn't work, there might be an /AS key, whose value is a name with
// the export value, again with a leading '/', so remove it!
var curVal = valueDict.GetAsName(PdfName.AS);
if (curVal != null)
return curVal.ToString().Substring(1);
else
return string.Empty;
}
public static void ReturnPDF(byte[] contents)
{
ReturnPDF(contents, null);
}
public static void ReturnPDF(byte[] contents, string attachmentFilename)
{
var response = HttpContext.Current.Response;
if (!string.IsNullOrEmpty(attachmentFilename))
response.AddHeader("Content-Disposition", "attachment; filename=" + attachmentFilename);
response.ContentType = "application/pdf";
response.BinaryWrite(contents);
response.End();
}
}
The parts of the tutorial you're looking for in that case are right here:
Response.ContentType = "application/pdf";
Response.BinaryWrite(output.ToArray());
When saving a "file" to a database you essentially care about two (maybe three) things:
The byte array of the file contents
The type of the file
(Maybe a name for the file)
Since the tutorial concludes with two of these things (above), the type and the data, you can store these two things into your database however you need to store them. This depends on the database you're using, how you access that database, etc. Essentially to store these two things you just need a text column (varchar?) and a binary (or "blob") column (varbinary?).
The only difference is that instead of setting the type as a header in an HTTP response and writing the bytes to that HTTP response, you're using both of them as values in your database. Everything else is the same.

Asp.net how to correct the error

I'm designing in my web page and image are stored in my database (The project is Photostudio management system)
MY Code:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
namespace photoshops
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
SqlDataAdapter da = new SqlDataAdapter();
SqlConnection cnn = new SqlConnection();
DataSet ds = new DataSet();
string constr = null;
SqlCommand cmd = new SqlCommand();
if (IsValid != true )
{
constr = #"Data Source=DEVI\SQLEXPRESS;Initial Catalog =cat; Integrated
Security=SSPI";
cnn.ConnectionString = constr;
try
{
if (cnn.State != ConnectionState.Open)
cnn.Open();
}
catch (Exception ex)
{
string str1 = null;
str1 = ex.ToString();
}
cmd.Connection = cnn;
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "photoset";
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("#BillNo", TextBox1.Text);
cmd.Parameters.AddWithValue("#CustomerName", TextBox2.Text);
cmd.Parameters.AddWithValue("#Address", TextBox3.Text);
cmd.Parameters.AddWithValue("#StartDate",Rdbsdate.SelectedDate );
cmd.Parameters.AddWithValue("#EndDate", Rdbddate.SelectedDate );
SqlParameter param0 = new SqlParameter("#Systemurl", SqlDbType.VarChar,
50);
cmd.Parameters.AddWithValue("#Numberofcopies", TextBox7.Text);
cmd.Parameters.AddWithValue("#Amount", TextBox8.Text);
cmd.Parameters.AddWithValue("#Total", TextBox9.Text);
da.SelectCommand = cmd;
try
{
da.Fill(ds);
}
catch (Exception ex)
{
string strErrMsg = ex.Message;
//throw new applicationException("!!!! An error an occured while
//inserting record."+ex.Message)
}
finally
{
da.Dispose();
cmd.Dispose();
cnn.Close();
cnn.Dispose();
}
if (ds.Tables.Count > 0)
{
if (ds.Tables[0].Rows.Count > 0)
{
Msg.Text = "Photo setting sucessfullY";
}
else
{
Msg.Text = "photosetting failled";
}
}
}
}
}
}
My ERROR
The record are not stored and image is not stored how to change in my code .
Well first of all, you're not saving the image, you're saving the path of your computer.
You need to save the byte array of the photo.
In short:
Upload its the upload control where you select the image
pic its the byte arrey where you upload the binary content of the photo
and then you only send it as a simple parameter cmd.Parameters.Add ("#pic", pic);
public void OnUpload(Object sender, EventArgs e)
{
// Create a byte[] from the input file
int len = Upload.PostedFile.ContentLength;
byte[] pic = new byte[len];
Upload.PostedFile.InputStream.Read (pic, 0, len);
// Insert the image and comment into the database
SqlConnection connection = new
SqlConnection (#"server=INDIA\INDIA;database=iSense;uid=sa;pwd=india");
try
{
connection.Open ();
SqlCommand cmd = new SqlCommand ("insert into Image "
+ "(Picture, Comment) values (#pic, #text)", connection);
cmd.Parameters.Add ("#pic", pic);
cmd.Parameters.Add ("#text", Comment.Text);
cmd.ExecuteNonQuery ();
}
finally
{
connection.Close ();
}
}
here are some tutorials, the first link it's very straightforward and the code its simple
http://www.codeproject.com/KB/web-image/PicManager.aspx
another, just in case:
http://www.redmondpie.com/inserting-in-and-retrieving-image-from-sql-server-database-using-c/
Principal resource: http://www.codeproject.com/KB/web-image/PicManager.aspx

public class ImageHandler : IHttpHandler

cmd.Parameters.AddWithValue("#id", new system.Guid (imageid));
What using System reference would this require?
Here is the handler:
using System;
using System.Collections.Specialized;
using System.Web;
using System.Web.Configuration;
using System.Web.Security;
using System.Globalization;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using System.IO;
using System.Web.Profile;
using System.Drawing;
public class ImageHandler : IHttpHandler {
public void ProcessRequest(HttpContext context)
{
string imageid;
if (context.Request.QueryString["id"] != null)
imageid = (context.Request.QueryString["id"]);
else
throw new ArgumentException("No parameter specified");
context.Response.ContentType = "image/jpeg";
Stream strm = ShowProfileImage(imageid.ToString());
byte[] buffer = new byte[8192];
int byteSeq = strm.Read(buffer, 0, 8192);
while (byteSeq > 0)
{
context.Response.OutputStream.Write(buffer, 0, byteSeq);
byteSeq = strm.Read(buffer, 0, 8192);
}
//context.Response.BinaryWrite(buffer);
}
public Stream ShowProfileImage(String imageid)
{
string conn = ConfigurationManager.ConnectionStrings["MyConnectionString1"].ConnectionString;
SqlConnection connection = new SqlConnection(conn);
string sql = "SELECT image FROM Profile WHERE UserId = #id";
SqlCommand cmd = new SqlCommand(sql, connection);
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue("#id", new system.Guid (imageid));//Failing Here!!!!
connection.Open();
object img = cmd.ExecuteScalar();
try
{
return new MemoryStream((byte[])img);
}
catch
{
return null;
}
finally
{
connection.Close();
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
Maybe typo. Capitalize the first letter of System namespace.
new System.Guid (imageid)

ASP .NET Dataset to XML: Storage and Reading

[Below is the almost full Code modified. Currently shows illegal character error when being read].
I have a C# ASP.NET application which is currently reading an XML file from the file system and then loading it into a GridView control. In the grid I can Delete rows. There is also an file upload button below the grid which upload PDF files and they show up in the grid. My code is basically a modified version of this code
The next stage of my work involves reading the XML data as String from a database field--instead of from the XML file. For that to happen, I think I can start out by just reading from the XML file, making changes in the aspx page, and the writing the 'dataset' into a database field called 'PDF_Storage'. How can I do that. Crucially, I need to be able to convert the dataset into some kind of string format for storage. Here is my code snippet.
My database is Oracle 10 but I can figure out the Update sql syntax.
SAMPLE XML FILE:
<DataSet>
<PDF>
<pdf>MyPDF1.pdf</pdf>
</PDF>
<PDF>
<pdf>MyPDF2.pdf</pdf>
</PDF>
<PDF>
<pdf>MyPDF3.pdf</pdf>
</PDF>
</DataSet>
And the corresponding code:
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";
}
Here is how I have done this in the past. For the insert you can basically just write the dataset's xml representation out to a string and save it directly to a field in the database. In this case I leveraged Sql Server 2008 and an XML datatype for the database field. I think the datatype in Oracle is XMLTYPE.
Insert:
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();
}
}
}
Getting the dataset back out of the database is as simple as reading the xml data from the database back into a TextReader and then building a new DataSet.
Get:
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;
}
Hope this helps.
Enjoy!

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