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If you are using .net 2.0 then ado supports MARS (multiple result sets). Here is some sample code from MS help:
' Assumes that connection is a valid SqlConnection object.
Dim command As SqlCommand = New SqlCommand( _
"SELECT CategoryID, CategoryName FROM dbo.Categories;" & _
"SELECT EmployeeID, LastName FROM dbo.Employees", connection)
connection.Open()
Dim reader As SqlDataReader = command.ExecuteReader()
Dim nextResult As Boolean = True
Do Until Not nextResult
Console.WriteLine(vbTab & reader.GetName(0) & vbTab & reader.GetName(1))
Do While reader.Read()
Console.WriteLine(vbTab & reader.GetInt32(0) & vbTab & reader.GetString(1))
Loop
nextResult = reader.NextResult()
Loop
reader.Close()
connection.Close()
Hope that helps.
Ben
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hi,
This will not work.
The qurey provided by you will return table1.rowcount * table2.rowcount number of recored.
Can you please specify why you want data from both table and what is the actual requirment?
Thanks and Regards,
Chetan Ranpariya
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@kubben I will check it
@Chetan
I have a hardware device that is connected to a sql database. I also have 7 switches connected to this device. So every time I toggle the boolean value(press button event in asp.net page) I turn on or off the corresponding switch. I use Page_load to initialize the button controls. Every switch is connected to a table with on one record that I update from the page.
The whole code for "one" button looks like this:
Public SQLconn As New SqlConnection(ConfigurationManager.ConnectionStrings("TestConnectionString").ToString())
Sub Page_Load(ByVal Sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
SQLconn.Open()
Dim SelectCmd1 As New SqlCommand("SELECT rawvalue FROM switch1", SQLconn)
SelectCmd1.CommandType = CommandType.StoredProcedure
Dim result1 As Boolean
Dim myDataReader1 As SqlDataReader
myDataReader1 = SelectCmd1.ExecuteReader()
myDataReader1.Read()
result1 = myDataReader1.GetBoolean(0)
SQLconn.Close()
ChangeButton1(result1)
End Sub
Sub ChangeButton1(ByVal Status As Boolean)
If Status Then
Label1.Text = "ON"
OnOff1.Style.Value = "background-image: url(../ImgContr/1.png);"
Else
Label1.Text = "OFF"
OnOff1.Style.Value = "background-image: url(../ImgContr/2.png);"
End If
End Sub
Sub OnOff_Click1(ByVal Sender As Object, ByVal e As System.EventArgs)
Dim updateCMD As SqlCommand
Dim query As String
If Label1.Text = "ON" Then
query = "UPDATE [switch1] SET [rawvalue] = 'False' WHERE [device] = 'channel1'"
ChangeButton1(0)
Else
query = "UPDATE [switch1] SET [rawvalue] = 'True' WHERE [device] = 'channel1'"
ChangeButton1(1)
End If
updateCMD = New SqlCommand(query, SQLconn)
updateCMD.CommandType = CommandType.Text
SQLconn.Open()
updateCMD.ExecuteNonQuery()
SQLconn.Close()
End Sub
It works for 7 switches too but I have to write every SUB 7 times.
And the initialization looks like this:
Sub Page_Load(ByVal Sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
SQLconn.Open()
Dim SelectCmd1 As New SqlCommand("prodiakoptis1", SQLconn)
SelectCmd1.CommandType = CommandType.StoredProcedure
Dim result1 As Boolean
Dim myDataReader1 As SqlDataReader
myDataReader1 = SelectCmd1.ExecuteReader()
myDataReader1.Read()
result1 = myDataReader1.GetBoolean(0)
SQLconn.Close()
SQLconn.Open()
Dim SelectCmd2 As New SqlCommand("prodiakoptis2", SQLconn)
SelectCmd2.CommandType = CommandType.StoredProcedure
Dim result2 As Boolean
Dim myDataReader2 As SqlDataReader
myDataReader2 = SelectCmd2.ExecuteReader()
myDataReader2.Read()
result2 = myDataReader2.GetBoolean(0)
SQLconn.Close()
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Hi,
First of all you dont need to open and close the connection everytime you are calling new stored procedure.
You can create only one stored procedure which will return all the values u need in the form of output parameters. Remeber this is advisable only if your number of switches is not going to change in future.
You must be familier with how to create and execute stored procedure with output parameters.
Thanks and Regards,
Chetan Ranpariya
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I actualy created a SP to retrieve the data from the tables.
ALTER PROCEDURE dbo.switch1
/*
(
@parameter1 int = 5,
@parameter2 datatype OUTPUT
)
*/
AS
SELECT [rawvalue] FROM [switch1]
/* SET NOCOUNT ON */
RETURN
I have one SP for every table.
Even if I create a SP what I don't know is how to read all this values with the datareader.
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Hi,
Is your current procedure is returning more than one rows/values?
Thanks and Regards,
Chetan Ranpariya
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No the table has only one row and the procedure returns only one boolean value.
Thanks
Leonidas Kallis
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Hi,
Then it is not necessary to use reader.
You can create a procedure that will return the values u need and then you those values as per your requirement.
In the procedure you can write selecte statements for all the tables and the assing the values to the output parameters.
By this way you will not need to write the same code again and again and only one procedure will do all your work.
Thanks and Regards,
Chetan Ranpariya
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Hi,
I hope the following solution will help you.
You create a common event handler for the command event of all your switchbuttons.
public void bttns_command(object sender, CommandEventargs e)
{
if(e.CommandName == "Switch1")
{
//do work related to switch1;
if(Label1.Text == "ON")
{
query = "Update ..........."
ChangeButton("Switch1",0);
}
else
{
query = "update............."
ChangeButton*("Switch1",1);
}
updateCMD = New SqlCommand(query, SQLconn)
updateCMD.CommandType = CommandType.Text
SQLconn.Open()
updateCMD.ExecuteNonQuery()
SQLconn.Close()
}
else if(e.CommandName == "Switch2")
{
if(Label2.Text == "ON")
{
query = "Update ..........."
ChangeButton("Switch2",0);
}
else
{
query = "update............."
ChangeButton*("Switch2",1);
}
updateCMD = New SqlCommand(query, SQLconn)
updateCMD.CommandType = CommandType.Text
SQLconn.Open()
updateCMD.ExecuteNonQuery()
SQLconn.Close()
}
else if(e.CommandName == "Switch3")
{
if(Label3.Text == "ON")
{
query = "Update ..........."
ChangeButton("Switch3",0);
}
else
{
query = "update............."
ChangeButton*("Switch3",1);
}
updateCMD = New SqlCommand(query, SQLconn)
updateCMD.CommandType = CommandType.Text
SQLconn.Open()
updateCMD.ExecuteNonQuery()
SQLconn.Close()
}
}
The html for your buttons should look like following.
<asp:Button id="bttnSwitch1" Runat="server" CommandName = "Switch1"
OnCommand="bttns_command"></asp:Button>
<asp:Button id="bttnSwitch2" Runat="server" CommandName = "Switch2"
OnCommand="bttns_command"></asp:Button>
<asp:Button id="bttnSwitch3" Runat="server" CommandName = "Switch3"
OnCommand="bttns_command"></asp:Button>
Now you ChangButton function shuld look like following:
private void ChangeButton(string switchname, bool status)
{
if(switchname == "Switch1")
{
if(status)
{
Label1.Text = "ON";
OnOff1.Style.Value = "background-image: url(../ImgContr/1.png);"
}
else
{
Label1.Text = "OFF"
OnOff1.Style.Value = "background-image: url(../ImgContr/2.png);"
}
}
else if(switchname == "Switch2")
{
if(status)
{
Label2.Text = "ON";
OnOff2.Style.Value = "background-image: url(../ImgContr/1.png);"
}
else
{
Label2.Text = "OFF"
OnOff2.Style.Value = "background-image: url(../ImgContr/2.png);"
}
}
else if(switchname == "Switch3")
{
if(status)
{
Label3.Text = "ON";
OnOff3.Style.Value = "background-image: url(../ImgContr/1.png);"
}
else
{
Label3.Text = "OFF"
OnOff3.Style.Value = "background-image: url(../ImgContr/2.png);"
}
}
}
I hope this will help you.
Thanks and Regards,
Chetan Ranpariya1
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Thank you very much...
I will study the above code and see what I can do...
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Hi,
My form contains only Textbox and Button.I have a string variable in cs file and HTML TextField in aspx page. Str I have a value i am placing Request.Querystring().So I need javascript validation like this
user Should not Enter the value that String value contains.Pls tell me syntax in javascript.
Thanks
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You would do better to render the value as a variable in javascript. Then your textbox should contain an onblur that checks if it's text equals this variable.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Sure,
and just to complement Graus sugestion, you can get that variable in your URL using a Javascript QueryString method (search for it) in the onload event of your page`s body.
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How can we use web parts as in like >> have a look at this site
http://www.pageflakes.com (asp.net 2.0 )
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Hi
ALL of you.
i use view state for sorting code is given but problem
is that it sorts perfectly on name but not on date ..
What to do????
actually i chage the date into varchar in order to display in drid
For Ex it shows 01 Feb 2007 in Grid but when i click on header it
dont sort in correct way..
<br />
<br />
Bind();<br />
oColumnCollection=dgHistory.Columns;<br />
if(ViewState["SortOrder"].ToString() == "" || ViewState["SortOrder"].ToString() == "DESC")<br />
{<br />
dv.Sort = e.SortExpression;<br />
<br />
ViewState["SortExpression"]= e.SortExpression + "ASC";<br />
ViewState["SortOrder"] = "ASC";<br />
}<br />
else<br />
{ <br />
dv.Sort = e.SortExpression + " DESC";<br />
<br />
ViewState["SortExpression"]= e.SortExpression + " DESC";<br />
ViewState["SortOrder"] = "DESC";<br />
}<br />
<br />
dgHistory.DataBind();<br />
Thanks
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For date sorting, you have to use some different logic, especially date sorting is the best one. But, here you are using just string sorting, so you won't get correct result.
So, use date field in the dataview instead of changing into varchar (that is best way), and use format to display the date into the specified format. You can use the DataFormatString property in grid.
For example: for bound column,
....asp:BoundColumn DataField="FieldName" DataFormatString="{0:dd MMM yyyy}" .....
I hope, you can get the answer from this.
Regards
R.Arockiapathinathan
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Hi,
Do not covnert you date column to varchar but set the DataFormatString property of the column in which you are displaying the date value.
Design Time
<asp:BoundColumn DataField="colName" DataFormatString = "{0:dd-MMM-yyyy}"></asp:BoundColumn>
I hope this will help you.
Thanks and Regards,
Chetan Ranpariya
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Hi, can anyone tell where i can donwnload free ASP richtextbox?
Thank
................
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Hi All..
I have a datagrid holding values in it..I have a button below that datagrid(print button)..If i click the print button the datagrid values should be sent to the printer and the print out must be taken..I have the datagrid in as .aspx page(ASP .NET)..Someone help in this regard with the code..
Regards,
Balaguru
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Balagurunathan S wrote: If i click the print button the datagrid values should be sent to the printer and the print out must be taken
Create one more empty page with this datagrid. Then on the body onload event write window.print. It will open printer dialog
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Plenty of informations is available in the net.
Just google it.
"Printing DataGrid in ASP.NET"
Regards,
Arun Kumar.A
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Have you seen the Article by Russ Quinn in CP.
Print Datagrid in Asp.Net[^]
This article will be very helpful for developing your printing options in a Datagrid in Asp.net
Regards,
Satips.
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