Use Datareader And Open New Connection To The Database On Every Client Query?

Jul 6, 2009

I'm building application that will heavily use database (about 25k query's in few hours) , what is the best way to go:

A) use datareader and open new connection to the database on every client query.

B) load all the needed tables into dataset once the program loaded and use that dataset for the query's?

View 8 Replies


ADVERTISEMENT

Cannot Open Database Using Sql Query For Connection?

Nov 17, 2009

i am doin project using vb.net 2005 and using this sql query for connection

sql = "select username from login order by username"

con.ConnectionString = "Data Source=" & hostname & "; Initial Catalog=college;integrated security=sspi"

but m getting the following error:

Cannot open database "college" requested by the login. The login failed.Login failed for user 'CI4Admin'.

View 7 Replies

C# - WCF ReceiveTimeout Infinite - Keep The Client-server Connection Endless Open

Mar 6, 2012

I'm using a "wsHttpBinding" with a reliable session. I'd like to keep the client-server connection endless open. Therefore I need to set the ReceiveTimeout to "infinite". Has the "ReceiveTimeout" an other purpose (e.g. client crash detection; detecting a hanging request; etc) or can I set it to "infinite" without problems?

View 1 Replies

Datareader - Error - "there Is A Datareader Associate With This Connection That Need To Be Closed"

Aug 17, 2009

I have a problem with my project. here is the problem:

My code for login is as follows:

dim conn as SqlConnection = New SqlConnection("Data Source.................)
dim cmd as SqlCommand = New SqlCommand("Loguser",conn)
cmd.CammandType = CommandType.StoredProcedure

[CODE]...

Now the error i get is that "there is a datareader associate with this connection that need to be closed"

View 4 Replies

Update Query Failing - Error: Connection Must Be Valid And Open

Mar 29, 2011

[Code]...

Im clearly opening it there and its valid as i use the same connection to login with, anyone know the problem?

View 4 Replies

VS 2008 : Creating Own DataReader Like TCP Client/Server?

Jun 2, 2010

I'm not even sure where to start. I would like to create something like the ADO DataReader but that works in a TCP Client/Server scenario.Basically, in the TCP Client, I want to be able to call a certain command in the TCP Server which will return a DataReader like object, which I can then iterate through such as:

while dr.Read from the client. In each loop, I would parse out the various fields as in a normal DataReader.The reason I want to do this is to gain the inherent efficiency of the DataReader object since it doesn't first load ALL of the data. To my understanding, the typical TCP Client/Server setup using streams, would first load all of the data on the server, then transport ALL of that data to the client for processing. I want to avoid that, and just stream the data as the client requests through the Read() command which means the connection will remain open to the server while the Read() command is being issued by the client, or until explicitly closed by the client.

View 5 Replies

Can't Open To Connection To SQL Database

Nov 23, 2011

I have a .mdf file that I open through an Open Dialog Box and use in a ConnectionStringBuilder (where I have the user instance set to True). Later, in one of my button clicks, I try to open the connection (connection.Open()). It then gives me an error as follows: "Generating user instances in SQL Server is disabled. Use sp_configure 'user instances enabled' to generate user instances."

Here is my code:

Option Strict On
Imports System.Data.SqlClient
Public Class frmMain

[code]....

View 2 Replies

How To Open Database Connection

May 12, 2005

I am currently working on a login page using vb.net. I would like to know how to make connection to an access database and verify that the user logged in is a valid user

View 6 Replies

Open Connection To Database?

Jan 17, 2009

i want to know how to open a connection to database from vb.net

View 3 Replies

Failed To Open Connection To Database

Apr 17, 2009

I am developing an application that is using a Jet database (Access 2007). The database is local to the project (e.g., on the same drive and in the project directory). Any time I attempt to access the database (to create another DataSet, etc., via designer, etc.), I get the ubiquitous "Failed to open a connection to the database" with:
No error message available, result code: E_UNEXPECTED(0x8000FFFF).
Opening the Database Explorer and attempting to attach to the database results in the above as well. There are no apparent locks on the file, etc., and I'm the sole developer for this.

View 5 Replies

Open A Connection To A Local Database?

Jun 22, 2010

I'm trying to a open a connection to a local database and no matter what I try it just won't work (I'm pretty new to SQL Server and VB for that matter) I tried using 'sqlconnection' with different connection strings but none of them worked or gave me any useful error messages so I tried using 'OleDBConnection' instead, this hasn't worked either and it gives me this error instead:"A first chance exception of type 'System.NullReferenceException' occurred in MyProgram.exe"

Here is the code I am currently trying:

Private Sub MemDetailsSearch_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ConnectionString = ("Provider = Microsoft.Jet.OLEDB.4.0;" & "Data Source = Database.sdf")
DataConnect = New OleDbConnection(ConnectionString)

[code]....

View 2 Replies

Using The SQL And Create A New Database And Open A Connection To It?

Dec 31, 2010

I installed SQLExpress 2008 on my computer this afternoon and have been trying to create a new database and open a connection to it. I found this code online and tried it:

Dim
conStr As
String =
"Server=MSSMLBIZ;Database=;Trusted_Connection = yes"

[code]....

View 2 Replies

What Is The Right Way To Close My Database Connection While Its Open

Apr 26, 2012

I want to know what is the right way to close my Database connection while its open.

This is how i open my connection.[code..]

View 2 Replies

VS 2008 Chat Server/client - After The Client Clicks Disconnect Or Closes By Task Manager, Looses Connection

Aug 18, 2009

Im using the code from [URL] as a starter, most of the code is the same. the chat system works fine but on the client a added a disconnect button "clientSocket.Close()" and as soon as i click that i get errors, on the client, this is the code...

Private Sub getMessage()
For infiniteCounter = 1 To 2

[CODE]...

And this line...

serverStream.Read(inStream, 0, buffSize)
gives me "Unable to read data from the transport connection: A blocking operation was interrupted by a call to WSACancelBlockingCall."

Now im talking the server, after the client clicks disconnect or closes by task manager, looses connection, etc the server crashes and gives me.

View 5 Replies

Use Multiple Datareader In Same Connection?

Sep 8, 2009

I am using MySql 5.0. I using Mupliple datareader in same connection i get error message. Is possible to use multiple Datareader in same connection?

I using Mysql Connection is

MySqlConn.ConnectionString = "SERVER=" & gServerName & ";DATABASE=" & DBname & ";user=" & gUserName & ";password=" & gPassword & ";MultipleActiveResultSets=True"
MySqlConn.Open()

View 1 Replies

DB/Reporting :: Changing Database While Connection Open?

May 17, 2010

I have a connection string in my app.config:

Code:
connectionString="data source=.sql2008 ;Database=Database1; Integrated Security=FALSE; Persist Security Info=True;" />

How do I change to another database (one of many) without using multiple strings? Can I change while the connection is open?

Code:
Dim myConn As New SqlConnection(System.Configuration.ConfigurationManager.AppSettings("ConnectionString"))

View 3 Replies

Open An Oracle Database Connection In .net 2008?

May 18, 2009

I am trying to open an Oracle database connection in vb.net 2008 in order to issue a Select statement and the populate a listbox with it.

My code is as follows:

Dim orclstr As String = _
"Provider=OraOLEDB.Oracle;" & _
"Data Source=10.0.0.77;" & _
"User ID=myuser;" & _

[code]....

Obviously, I am doing something wrong, but I can't figure out what.

View 1 Replies

SQL Connection - Error Message:Cannot Open Database?

Jul 17, 2009

I keeping getting an error.Seems to be the connection string.Error happens at connection.Open()

Error Message:Cannot open database "C:UsersJEREDocumentsVisual Studio 2008ProjectsBaseball2009Baseball2009DatabaseBaseball2009.sd"
requested by the login. The login failed. Login failed for user 'JERE-PCJERE'.

Imports System.Data.SqlClient
Public Class Field
Private Sub Field_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load[code]..........

View 2 Replies

Can't Open MSI Database For A Query Using VB 2010

Jun 28, 2012

I am trying to query a MSI to get the ProductCode from the MSI so I can later populate a script with the proper ProductCode.During debugging it "looks" like the database is open for read, however if I look at the oDB object I see this "Error = No further information on this object could be discovered" When it tries to do the OpenView on the SQL statement it throws an exception "OpenView, Sql" I believe that is because the MSI really isn't open for read?I have added the reference to the Microsoft Windows Installer Object Library version 1.0.0.0

Here is the code: (I pass the fully qualified path + filename of the msi)

Private Sub GetMsiProperty(ByVal sMSIFilePath As String)
Const sReadMSIDataBaseErrorStr As String = "ERROR: Could not read MSI database!"
Const msiOpenDatabaseModeReadOnly = 0

[code]....

View 6 Replies

VS 2008 - Have To Open And Close The Connection And The Data Reader While Access The Database?

Apr 21, 2009

When using SQL connections in my program, will I have to open and close the connection and the data reader each time I want to access the database ?

[code]...

View 1 Replies

.net Datareader Already Open Error When Not Used Before

Jun 22, 2011

I have this sub as part of my login / logout system. When this sub is called to login users it works perfectly, but on logout it throws an error that doesn't make any sense to me.

[Code]...

This sets a nonsense email address so that when validate_session searches for a valid email/session combo in the db it trips the destruction of the sensitive session data.

The question boils down to this: Why is the error being thrown when the logout sub calls validate_session?

View 1 Replies

There Is Already An Open DataReader Associated With This Command

Mar 13, 2012

There is already an open DataReader associated with this Command which must be closed first

Dim staffid = TextBox1.Text
Dim conn As New SqlConnection
conn.ConnectionString = SqlDataSource1.ConnectionString

[code]....

View 4 Replies

Error: There Is Already An Open DataReader Associated With This Command

Jul 12, 2009

I have two datareaders: [Code] When i'm running the code i get this error in the highlighted line: "There is already an open DataReader associated with this Command which must be closed first." I used different variables in both readers, why do i get this error? do i have to open a new sqlConnection for this task?

View 13 Replies

Open DataReader Associated With This Command Which Must Be Closed First?

Feb 7, 2011

Ok...i have read all posts..and no solution...on main form I have...

adapSB.Connection.ConnectionString = "Password=xxx;Persist Security Info=True;User ID=xxx;Initial Catalog=dbone;Data Source=xxx
adapSB.Fill(DTSB)

and in class that starts new thread started every time users change some data(very often)

[Code]...

1. other parts of application are targeting other SQL server...just this adapter is updating only one row(table has two columns, some id and last time any of users changed something.

View 4 Replies

There Is Already An Open DataReader Associated With This Command Which Must Be Closed First

Feb 20, 2012

This reader is done in the form load event and is the very first thing done so I don't understand why it's telling me there is an open DataReader. I've also set MARS=True in my connection string so obviously it is something else.Here's my code and like I said the routine is called at the top of the form load event. The error occurs on the

Reader_Customer = command.ExecuteReader() line:
Module Globals
Public g_strConnectionString As String = "workstation id=" & System.Environment.MachineName & ;" _ & "packet size=4096;Connection Timeout=60; " _

[code].....

View 4 Replies

Error - There Is Already An Open DataReader Associated With This Command Which Must Be Closed First

Oct 14, 2009

I get the following message "There is already an open DataReader associated with this Command which must be closed first." Is the insert statement the most effiecient way to write to the table row by row?

Dim comment As String Dim cnx As Data.SqlClient.SqlConnection = SqlCnx.SourceDB Dim cmd As New Data.SqlClient.SqlCommand("select number,comment from [Comments]", cnx) Dim daComments As New SqlClient.SqlDataAdapter Dim bsComments As New BindingSource cmd.CommandTimeout = "360" cmd.CommandType = CommandType.Text cnx.Open()

[code]....

View 3 Replies

VS 2010 DataReader: Syntax Error (missing Operator) In Query Expression?

Jun 4, 2012

Dim cellidentification = ComboBox1.SelectedItem
Dim SCR = ComboBox2.SelectedItem
Dim mySelectQuery1 As String = "SELECT [" +

[code].....

View 35 Replies

Copy Opened Database - Application Gets It's Data From A Mdb-file And The Connection Remains Open As Long A Person Works?

May 14, 2010

The fact is I'm making an application, which users can install by using a Setup file...once installed the data in the database can be updated by a centralized server. To do this, they can insert a DVD/CD-ROM and export the necessary data towards it. I need to do it that way, because some of the users who really need this data will be using stand alone computers.The application gets it's data from a mdb-file and the connection remains open as long a person works with the application (maybe not the best way to do, but I know :-) )...when the user uses the application, he can perform an export...this exports the .ini-file and pictures (which works fine), but he also needs to export the mdb behind the application...I already tried connection.close() before and connection.open() after the System.IO.File.Copy...but that doesn't seems to work.

View 2 Replies

VS 2008 Recursion Failing With Command/DataReader Objects Already Open

Jun 26, 2009

I'm trying to put together a quick example for another thread about treeviews, and I'm getting a problem when I have a recursive routine, getting the message.

Quote:

There is already an open DataReader associated with this Command which must be closed first.

I'm a tad confused as I am explicitly creating a new command every time through the loop, so I'm not sure (unless its something ADO is doing behind the scenes) how the datareaders higher up the tree are interfering.

Here's my code :

Private Sub SetupChildren(ByVal ParentID As Integer, ByRef ParentNode As TreeNode)
Dim MyCommand As New SqlCommand("SELECT * FROM Groups WHERE ParentGroup=@ParentGroup", m_myConnection)

[Code]...

Obviously I could close the data reader down before calling the next level of recursion but it would prevent the code continuing the loop at the current level when it had finished processing children.

View 5 Replies

Error - ExecuteScalar Requires An Open And Available Connection - The Connection's Current State Is Closed

Aug 3, 2011

i have an application. which is executed after every 5 mins. i have an open connection but it gives me the following error:

ExecuteScalar requires an open and available Connection. The connection's current state is closed.

my code is something like this. I have shown where all i am using ExceuteScalar()

Sub Main()
Try
connection.open()
cmd.ExecuteScalar()

[code]....

View 2 Replies







Copyrights 2005-15 www.BigResource.com, All rights reserved