Image Retrieving From Database
Jan 16, 2004
hi,
I have a SQL database that has Images stored. I am able to read the image from the database and display it. But i am not able to control the size and the position where it is displayed. I want to develop something like a photo album. the images should be displayed in a smaller size. but when the user clicks on the image, it should blow up to its original size.
I am struggling with this for some time. Any suggestions as how to develop it??.
Any help in this regard would be highly appreciated.
thanks,
-sriram
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Jul 3, 2007
Ok, again, I'm reasonably new to this. I've been trying to display an image stored in SQL in a ASP.NET page. Pretty simple stuff I would have thought. I've read countless examples of how to do this online, and many of them use the same method of displaying the image, but none seem to work for me. The problem seems to lie in the following line of code:
Dim imageData As Byte() = CByte(command.ExecuteScalar())Which always returns the error: Value of type 'Byte' cannot be converted to '1-dimensional array of Byte'.Here's the rest of my code, hope someone can help. It's doing my head in!
Imports System.Data.SqlClient
Imports System.Data
Imports System.Drawing
Imports System.IOPartial Class _ProfileEditor
Inherits System.Web.UI.PageProtected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Get the UserID of the currently logged on user Dim NTUserID As String = HttpContext.Current.User.Identity.Name.ToString
Session("UserID") = NTUserID
Dim Photo As Image = NothingDim connection As New SqlConnection(ConfigurationManager.ConnectionStrings("MyConnectionString").ConnectionString)
Dim command As SqlCommand = connection.CreateCommand()
command.CommandText = "SELECT Photograph, ImageType FROM Users WHERE UserID = @UserID"command.Parameters.AddWithValue("@UserID", NTUserID)
connection.Open()Dim imageData As Byte() = CByte(command.ExecuteScalar())Dim memStream As New MemoryStream(Buffer)
Photo = Image.FromStream(memStream)
End Sub
End Class
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Sep 22, 2007
Dear Friends,
I have read many solution over the net, but since I am unable to utilize anyone according to my needs I am seeking help from you people.
I have a table imagedata in sql server 2005 having fields name and imageperson. Name is string and imageperson is Image field. I have successfully stored name of the person and his image in database.
I have populated the dataset from codebehind and bind it to the repeater.
By writing <%# DataBinder.Eval(Container.DataItem, "name")%>I am a able to retrieve the name of the person. But when I pass photodata as
<%#photogen((DataBinder.Eval(Container.DataItem, "imageperson")))%>
where photogen is function in code behind having structure
public void photogen(byte[] dataretrieved)
{
Response.BinaryWrite(datarerieved)
}
But it is giving error at <%#photogen((DataBinder.Eval(Container.DataItem, "imageperson")))%>
The best overloaded method match for '_Default.photogen(byte[])' has some invalid arguments
AND
Cannot convert object to byte[].
Can anyone please provide me working solution with code for aspx page and code behind.
Thanks and regards
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Sep 19, 2006
Hello and thanks for taking a moment. I am trying to retrieve and display an image that is stored in SQL Server 2000. My aspx code is as follows:<HTML> <HEAD> <title>photoitem</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:DataGrid id="DataGrid3" HorizontalAlign='Left' runat="server" AutoGenerateColumns="true" Visible="True"> <Columns> <asp:TemplateColumn HeaderText="Image"> <ItemTemplate> <asp:Image Width="150" Height="125" ImageUrl='<%# FormatURL(DataBinder.Eval(Container.DataItem, "InventoryItemPhoto")) %>' Runat=server /> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:DataGrid> </form> </body></HTML>-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------My code behind file is below VS 2003 does not like my datareader. It says the following: 'System.Data.SqlClient.SqlDataReader' does not contain a definition for 'Items'If there are any suggestions as to what I am doing wrong I would appreciate the input. - Jasonusing System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Data.SqlClient;using System.Text;namespace ActionLinkAdHoc{ /// <summary> /// Summary description for photoitem. /// </summary> public class photoitem : System.Web.UI.Page { string connStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"]; protected System.Web.UI.WebControls.DataGrid DataGrid3; private void Page_Load(object sender, System.EventArgs e) { // Get the querystring ID string item =Request.QueryString["ID"]; int ID=Convert.ToInt32(item); SqlConnection dbConn5 = new SqlConnection(connStr); SqlCommand sqlCom5 =new SqlCommand("sp4TWRetrieveItemPhotos"); sqlCom5.Connection = dbConn5; sqlCom5.CommandType = CommandType.StoredProcedure; sqlCom5.Parameters.Add("@ID", SqlDbType.Int); sqlCom5.Parameters["@ID"].Value =ID; dbConn5.Open(); SqlDataReader myDataReader; myDataReader = sqlCom5.ExecuteReader(CommandBehavior.CloseConnection); DataGrid3.DataSource = sqlCom5.ExecuteReader(); DataGrid3.DataBind(); while(myDataReader.Read()) { Response.ContentType = myDataReader.Items("JPEG"); Response.BinaryWrite(myDataReader.Items("InventoryItemPhoto")); } dbConn5.Close(); } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion }}
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Sep 19, 2006
Hello and thanks for taking a moment. I am trying to retrieve and display an image that is stored in SQL Server 2000. My aspx code is as follows:<HTML> <HEAD> <title>photoitem</title> <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1"> <meta name="CODE_LANGUAGE" Content="C#"> <meta name="vs_defaultClientScript" content="JavaScript"> <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"> </HEAD> <body MS_POSITIONING="GridLayout"> <form id="Form1" method="post" runat="server"> <asp:DataGrid id="DataGrid3" HorizontalAlign='Left' runat="server" AutoGenerateColumns="true" Visible="True"> <Columns> <asp:TemplateColumn HeaderText="Image"> <ItemTemplate> <asp:Image Width="150" Height="125" ImageUrl='<%# FormatURL(DataBinder.Eval(Container.DataItem, "InventoryItemPhoto")) %>' Runat=server /> </ItemTemplate> </asp:TemplateColumn> </Columns> </asp:DataGrid> </form> </body></HTML>-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------My code behind file is below VS 2003 does not like my datareader. It says the following: 'System.Data.SqlClient.SqlDataReader' does not contain a definition for 'Items'If there are any suggestions as to what I am doing wrong I would appreciate the input. - Jasonusing System;using System.Collections;using System.ComponentModel;using System.Data;using System.Drawing;using System.Web;using System.Web.SessionState;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.HtmlControls;using System.Data.SqlClient;using System.Text;namespace ActionLinkAdHoc{ /// <summary> /// Summary description for photoitem. /// </summary> public class photoitem : System.Web.UI.Page { string connStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"]; protected System.Web.UI.WebControls.DataGrid DataGrid3; private void Page_Load(object sender, System.EventArgs e) { // Get the querystring ID string item =Request.QueryString["ID"]; int ID=Convert.ToInt32(item); SqlConnection dbConn5 = new SqlConnection(connStr); SqlCommand sqlCom5 =new SqlCommand("sp4TWRetrieveItemPhotos"); sqlCom5.Connection = dbConn5; sqlCom5.CommandType = CommandType.StoredProcedure; sqlCom5.Parameters.Add("@ID", SqlDbType.Int); sqlCom5.Parameters["@ID"].Value =ID; dbConn5.Open(); SqlDataReader myDataReader; myDataReader = sqlCom5.ExecuteReader(CommandBehavior.CloseConnection); DataGrid3.DataSource = sqlCom5.ExecuteReader(); DataGrid3.DataBind(); while(myDataReader.Read()) { Response.ContentType = myDataReader.Items("JPEG"); Response.BinaryWrite(myDataReader.Items("InventoryItemPhoto")); } dbConn5.Close(); } #region Web Form Designer generated code override protected void OnInit(EventArgs e) { // // CODEGEN: This call is required by the ASP.NET Web Form Designer. // InitializeComponent(); base.OnInit(e); } /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.Load += new System.EventHandler(this.Page_Load); } #endregion }}
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Jul 21, 2005
i am trying to retrieve an image blob stored in SQL to a web matrix form (using VB.NET). I am totaly new to this and i got the code below from a site but it doesn't see to work.....
<%@ Page Language="VB" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.IO" %>
<%@ import Namespace="System.Drawing.Image" %>
<%@ import Namespace="System.Drawing.Bitmap" %>
<%@ import Namespace="System.Drawing.Graphics" %>
<%@ import Namespace="System.Web.UI.WebControls" %>
<%@ import Namespace="System.Data.Odbc" %>
<%@ import Namespace="System.Data.SqlClient" %>
<script runat="server">
Private Function GetImageFromDB(ByVal ImageID As Integer) As System.Drawing.Image
' Get the Connection string
Dim strConnection As String
strConnection = "server='(local)'; trusted_connection=true; database='mydatabasename'"
Dim conn As New SqlConnection(strConnection)
Dim sqlCommand As String
Dim strImage As String
Dim image As System.Drawing.Image
Try
sqlCommand = "SELECT ImageField FROM ImageTable WHERE MyImageId = " + ImageID.ToString
Dim cmd As New SqlCommand(sqlCommand)
cmd.Connection = conn
conn.Open()
Dim dr As SqlDataReader
dr = cmd.ExecuteReader()
While (dr.Read())
Dim byt As Byte()
byt = dr.Item(strImage)
Dim bmp As New System.Drawing.Bitmap(New System.IO.MemoryStream(byt))
image = bmp
End While
Catch ex As Exception
' Log Error
Response.Write(ex.Message)
Finally
If conn.State = ConnectionState.Open Then
conn.Close()
End If
End Try
Return image
End Function
Private Sub Page_Load (ByVal sender As System.Object, ByVal e As System.EventArgs)
If Not IsPostBack Then
GetImageFromDB(2111)
End If
End Sub
</script>
<html>
<head>
</head>
<body>
<form enctype="multipart/form-data" runat="server">
<asp:Image id="BrandSignImg" runat="server"></asp:Image>
</form></body></html>
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Jun 13, 2008
Kindly descibe how i can save image and retieve images with vb form. Also include vb code to execute the process.
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Sep 28, 2007
I have an employee directory application that displays employees in a gridview. When a record is selected, a new page opens and displays all info about the employee, including their photo. I have the code working that displays the photos, however, when no photo is present an exception is thrown that "Unable to cast object of type System.DbNull to System.Byte[]". I'm not sure how to test for no photo before trying to write it out.
My code is as follows (with no error trapping):
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load, Me.Load
Dim temp As String
Dim connPhoto As System.Data.SqlClient.SqlConnection
Dim connstring As Stringconnstring = Web.Configuration.WebConfigurationManager.ConnectionStrings("connPhoto").ConnectionString
connPhoto = New System.Data.SqlClient.SqlConnection(connstring)temp = Request.QueryString("id")
Dim SqlSelectCommand2 As System.Data.SqlClient.SqlCommand
Dim sqlstring As String
sqlstring = "Select * from dbo.PhotoDir WHERE (CMS_ID = " + temp + ")"SqlSelectCommand2 = New System.Data.SqlClient.SqlCommand(sqlstring, connPhoto)
Try
connPhoto.Open()Dim myDataReader As System.Data.SqlClient.SqlDataReader
myDataReader = SqlSelectCommand2.ExecuteReader
Do While (myDataReader.Read())
Response.BinaryWrite(myDataReader.Item("ImportedPhoto"))
Loop
connPhoto.Close()Catch SQLexec As System.Data.SqlClient.SqlException
Response.Write("Read Failed : " & SQLexec.ToString())
End TryEnd Sub
End Class
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Dec 3, 2007
As part of a web site I allow users to store documents in SQL Server 2000 using an Image column on a table. After the file is saved the user can open the document through the browser. This works great for most file extensions such as ".XLS" or ".DOC" but fails when attempting to open ".MSG" files (saved outlook messages). XLS documents will open in Excel and DOC documents open in Word, but MSG documents open in Notepad and display what appears to be binary data. I'm trying to figure out if this is a SQL Server issue or some sort of ASP/ASP.NET webserver issue.
If I attempt to open an MSG file stored directly on the web server, the file opens correctly using the "Microsoft Outlook View Control", but when attempting to open the same file saved in SQL Server, it attempts to open in notepad.
Any ideas?
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Aug 17, 2007
Hi,
I have a website and i am uploading the gif image to the database. i have used varchar(500) as the datatype and i am saving the file in the webserver so the path to it c:intepub....a.gif
my upload table has the folliwing feilds
UploadId Int Identity, Description, FileName, DiskPath varchar(500), weblocation varchar(500). I have a main sproc for the report where i am doing a inner join with other table to get the path of the gif..
So my question is how can i get a picture to show up on the report. .
What kinda datatype the gif file should be stored in the database? If it is stored as a varchar how can i access it and what is best way to reference that particular.
any help will appreciated....
Regards
Karen
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Sep 24, 2007
I am now retrieving the PDF from the database and I am getting an error:
Error 1 'GetImages.GetImage(int)': not all code paths return a value
I have:
int imageid = Convert.ToInt32(Request.QueryString["ACTUAL_IMAGE_PDF"]);
And...
private SqlDataReader GetImage(int imageid)
{
Sql Statement...
}
Could someone help please??
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Nov 29, 2007
VWD 2005 Express. I need to retrieve a value from a SQL database from the code behind a page and assign it to a variable. In Microsoft Access I can do this using the DLookup function. What I need to do is get the data that results from the following query into a variable:
SELECT [SystemUserId] FROM [SystemUser] WHERE ([Username] = @Username)
The name of the data source is SqlDataSource2
Also, in Access I can create a recordset from a query and then process through the recordset. Can that be done in VB code in VWD 2005 Express?
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Mar 25, 2008
Hi everyoneI created a database graphically in VS2005.Now I want the text version of those DDL(create) commands. Question is where and how are those commands stored in SqlServer I have the management studio too. Any ideas??
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Jun 10, 2008
Hi.
I've been traling the forum and the internet for a striaghtr forward solution on this.
I'm trying to do what loads of people have already achieved: retrive images from an SQL database.
I have successfully uploaded inages to an "iamges" table, storing the image as SQL type "image", also storing size, type, description, name etc.
I want to be able to read one or more of these images (and other data) back from the table.
I'm using C#, ASP NET 2.0, SQL,
Any examples I've found needed a lot of tweaking, and for some reason or other didn't work!
Please don;t just pose yet another URL to an example - I've probably tried it and failed already.
I don't mind if I display the images in a GridView or just within an aspx page.
Ideally I'd be able to dispaly a few images on a page.
I know how to read and display the rest of the data in the "images" table.
Can anyone help please?
Do you need more info?
Thanks in advance,
Garrett
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Nov 23, 2004
hello
i want to know if there is any way to retrieve all the tables for a Database programmatically.
i want to connect to a server and select a database .then by selecting the database all it's tables be loaded into a ComboBox(for example)..the tables name i mean.
i want to give the user the option to select a table from a database.if it is possible help me
my programming language is C#.Net
any information is appereicated
Somayeh
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Jun 5, 2007
Hi, I've been trying to write an sql statement that can output the 10 minimum entries from a database, but I can't figure out how to do it.
Any help?
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Jun 4, 2006
Hi all,
I am working on a project on PocketPC in which it is required to reteive data from database. I have created database on simulator as .sdf file. I want to retreive data from eVC++ code. How i can do so?
thanx
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Sep 18, 2007
Heres my requirement from a financial analysis im doing...I have just calculated an industry averages on financial ratios...Now i wanna upload this industry average to the system...so that I can compare it to the individual companies' averages after calculating a particular company's average; meaning i wanna be able to call the industry average of a particular ratio (eg Current Ratio) after calculating a company's corresponding ratio...Is there a code fragment i can use for this ?? Thanks in advance...Adam
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Sep 8, 2003
Hi,
I want to get information about all the indexes in a database.
Can any one suggest me a query for this.
Thanks.
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Oct 5, 2006
hi,
here i had created a database named "books" and it contains 8tables in sql server 2005. now i want to take a copy of this "books" database in another system which also have sql server2005 as a back end to asp.net. so where i can get this "books". i.e in which folder it will be saved. is it possible to svae this databse or have to svae each queries by which i created tables?
One can never consent to creep,when one feels an impulse to soar
RAMMOHAN
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Apr 9, 2007
I've played with various configurations of the MS SQL Server encryption functionality, and come across an embarrassingly easy question that I cannot seem to resolve. How do I retrieve the actual symmetric and asymmetric keys out of the database?
I'd like to explore the possibility of off-loading the encryption/decryption work from the database server to a load-balanced pool of servers. For this model to work the pool would need access to the keys. The symmetric keys currently are generated with the command...
create symmetric key EncryptionKey211
with algorithm = AES_256
ENCRYPTION BY certificate CreditCardCert
Am I missing something obvious here?
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May 12, 2006
I have inherited a database and with it a set of triggers that are 'apparently' installed. However I have a number of different 'versions' for a specific update trigger and it is not clear from the files which is the latest, hence I am unsure of what 'version' of the trigger is installed in the database itself.
I am trying to retrieve the trigger code from the databse so that i can correctly determine which one of my trigger files is the latest version.
I don't want to end up in a situation where an earlier version of the update trigger is installed as this could wreck the underlying data.
I have tried using the syscomments.text column that relates to the trigger but it only gives me a concatenated version of the sql code and not enough to determine which file version was used for the trigger.
Is there a way of retreiving the entire SQL code that was entered rather than just the first few lines?
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Jan 7, 2008
OK, this is the scenario. I have a database with many columns ( each a mean value and a standard deviation, and with it a set of coordinates that i want to retrieve ).
Then i have a value that i want to query with the database, by comparing it with the mean and its standard deviation, and it should return a few sets (lets say 2) of coordinates whereby the the value of the mean is closet to the one in the database, in order of nearest value. How should i do it, since i am not using the exact value of the mean in the database?
I know its a bit confusing the way i wrote, but anyone understand wat i am trying to say and can help, i am very grateful. I had googled around for answers but cannot find. Thanks.
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Dec 15, 2004
well i have got a form which displays some result from the databasse, it runs fi9 in webmatrix, but when i try to run it from my main page and when i click on that button which should displays the aspx page, it gives me this error:
############################################################
Server Error in '/' Application.
--------------------------------------------------------------------------------
Login failed for user 'MUFADDALASPNET'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'MUFADDALASPNET'.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[SqlException: Login failed for user 'MUFADDALASPNET'.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) +472
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) +372
System.Data.SqlClient.SqlConnection.Open() +384
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState) +44
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +304
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +77
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +36
Microsoft.Matrix.Framework.Web.UI.SqlDataSourceControl.PopulateDataSet(DataSet dataSet, String listName) +494
Microsoft.Matrix.Framework.Web.UI.SqlDataSourceControl.GetDataSource(String listName) +51
Microsoft.Matrix.Framework.Web.UI.DataBoundControl.ResolveDataSource() +95
Microsoft.Matrix.Framework.Web.UI.DataBoundControl.DataBind() +59
Microsoft.Matrix.Framework.Web.UI.MxDataGrid.DataBind() +10
Microsoft.Matrix.Framework.Web.UI.MxDataGrid.OnPreRender(EventArgs e) +62
System.Web.UI.Control.PreRenderRecursiveInternal() +62
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Page.ProcessRequestMain() +1489
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573
############################################################
i have kept no passwords in my mssql server 2000 database
can anyone help me out with this problem
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Aug 8, 2001
Hi,
How to ennumerate the Rights of an User for all the tables [Select/Insert/Update/Delete] in a database or how to ennumerate/list all the Table rights for a particular user in a database? By User, i mean the Login names [like bill, sam, sa] and not dbowner, public, etc. thanx in advance.
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May 6, 2008
MySql has a statement like:
SHOW CREATE TABLE tablename;
that returns the precise CREATE TABLE statement for the specified tablename.
Sql Management Studio also allows scripting Create Statement for any object by right-clicking it.
But I want to do this programatically, and fetch CREATE statements for Tables, Procedures & Views.
How can I retrive CREATE statements for Database objects progrmatically in Sql Server???
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Jul 8, 2007
I have a query that gets the tables, columns, indexes, index_columns for all tables in a data base.
But, I need to be able to select any data base on the server
and then drill down into the tables, columns, etc.
I looked at sys.databases but can't see how to relate that to the
sys.tables to extend my query.
Is there a way?
I've looked at the information_schema area and catalog views
but I don't see a solution yet.
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May 26, 2004
Hi All,
Currently i am defining a simple relationship between
Customers->Orders->Order Details through the Database Diagrams feature in
the SQL 2K. Using the Server Explorer, i can see the Database Diagrams, but
when i try to "drop" the Database Diagrams into the page, it gives the error
message.
I would like to know the procedures to retrieve the database relationships
from Database Diagrams and manipulate them through ADO.NET
I prefer to "convert" already defined relationship using SQL Server Database
Diagrams into XSD file or probably there is another method to "read" those
relationship and manipulate them.
Thank you very much for all your help
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Jul 18, 2014
I have a drop down menu for transmission. Inside the drop down menu, there are 1.Any 2.Auto 3.Manual options
Now I want to retrieve from my database, if the client select '1.Any' option. Meaning the output I want it to display all the products which have both auto and manual for transmission.
I have no problem retrieving all the products which either only have auto option or manual option.
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Sep 26, 2007
I have some VB.NET code to retrieve data from an SQL Server database and display it. The code is as follows: -------------------------------------------------------------------------------------------------------
sw_calendar = calendarAdapter.GetEventByID(cid)
If sw_calendar.Rows.Count > 0 Then
lblStartDateText.Text = sw_calendar(0).eventStartDate
lblEndDateText.Text = sw_calendar(0).eventEndDate
lblTitleText.Text = sw_calendar(0).title
lblLocationText.Text = sw_calendar(0).location
lblDescriptionText.Text = sw_calendar(0).description
Else
lblStartDateText.Text = "*** Not Found ***"
lblEndDateText.Text = "*** Not Found ***"
lblTitleText.Text = "*** Not Found ***"
lblLocationText.Text = "*** Not Found ***"
lblDescriptionText.Text = "*** Not Found ***"
End If
-------------------------------------------------------------------------------------------------------
If all of the fields in the database has values, everything works ok. However, if the title, location or description fields have a null value, I receive the following error message:
Unable to cast object of type 'System.DBNull' to type 'System.String'.
I've tried a bunch of different things such as:
Adding ".ToString" to the database field,
Seeing if the value is null: If sw_calendar(0).description = system.DBnull.value...
...but either I get syntax errors in the code, or if the syntax is ok, I still get the above error message.
Can anyone help me with the code required to trap the null within the code example I've provided? I'm sure there are other, and better, ways to code this, but for now I'd really like to get it working as is, and then optimize the code once the application is working (...can you tell I have a tight deadline )
Thanks,
Brad
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Dec 21, 2004
Hi there folks,
was just wondering if there was an easy way to include a files contents into a web page via a database field. A bit confusing i know.
Here goes:
I got a field called ContentPage stored in a database. (e.g Index.htm)
I want to retrieve this page and then include its contents in my middle div of the webpage like so: <!--#include file="<%=ContentPage%>"-->. Not allowing me to do this as you may have guessed. These pages will either be htm or aspx pages. This would make my life so much easier.
Is there any way of doing this or am i kidding myself.
Would appreciate any help.
Paul
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Jan 11, 2008
Mean_A Std_Dev_A Mean_B Std_Dev_B Mean_C Std_Dev_C X_Co Y_Co Posn
71.7
9.36
73.23
3.62
70.87
4.06
12
14
1
72.69
8.02
79.39
2.66
73.39
5.16
13
15
2
74.37
10.27
77.33
4.10
79.33
3.44
14
16
3
The Above is my database, I need help in retrieving the X_Co and the Y_Co using values of rcv_A, rcv_B and rcv_C to compare with the Mean_A, Mean_B, Mean_C. The values of rcv_A, rcv_B and rcv_C are instances of values that are not exact of the mean columns , and we want is to compare it against our database and retrieve the row that is the closest to the rcv_A, rcv_B and rcv_C.
Here is an example of what i need. Let's say my rcv_A = 71, rcv_B = 73 and rcv_C = 70.8, so the row with mean value closest would be row 1, followed by row 2, then row 3.
So the result i hope to retrieve is in order of the closest value and i only need the X_Co and Y_Co.
This is what i want
X_Co Y_Co
---------------------------
12 14
13 15
14 16
So anyone please can help me in querying for the above results? Thanks
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Feb 14, 2005
hi, friends
i need your help.
i want to add image into sql database.
how can i do this?
plz give any solution.
thank in advance.
it's urgent.
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