Leave The Connection Open Or Always Open And Close Immediately?
Jun 7, 2006
Hi there,
I got an approach like that:
1) Read something from DB - check the value, if true stop if false go on
2) Read the second Value (another SQL Statement) - check the value etc.
Now I could open the connection at 1) and if I have to go to 2) I leave the connection open and use the same connection at 2). Is it ok to do that?
The other scenario would be opening a connection at 1), immediately close it after I read the value and open a new connection at 2).
Thanks for the input!
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Mar 20, 2008
Hello, I have always closed my db connections asap after opening them and have always thought this was the best practice. But now I am wondering if I can just leave the connection open.
I created a windows service which runs on a timer and executes every 5 seconds. The problem is that the code takes longer than that to process and the code may be executing three times at once. Im worried that since I use the same connection each time the code executes that a connection opened by the first run through may be closed or reopened by the second or third running of the code resulting in an error. The connection is opened and closed about 10 times each time the timer event fires. Should I open the connection once and leave it open when the service is started and close it when it is stopped or on any error?
Thanks
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Feb 3, 2005
I am used to writing applications that hit the database "every so often" and am happy with opening and closing the connection to SQL Server for each one.
I am now writing an application that monitors a table where rows are written to it by a 3rd party application at possibly several rows per second. My job is to "pickup" those rows, analyse the data and move them to different tables. This will be done with a timer which is currently set to tick every second.
My question is: At what stage should I start to think about keeping open a permanent connection to the database ?
1 row per second ?
100 rows per second ?
Any suggestions appreciated.
Steve.
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Jan 24, 2008
I know that with traditional SQL systems, it is important to only open connections to a sql server when they are needed. However, since there is no "server" in mobile apps, is it bad practice to leave one open throughout the duration of an application?
The application is going to be constantly reading and writing to the data tables and it seems like it might be a good idea to leave it open.
Thanks!
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Jul 20, 2005
Just a quick question about connection management. My application willnever need more than 1 or 2 connections about at any given time. Also, I donot expect many users to be connected at any given time. For efficiency, Iwould like to keep connections alive throughout the lifetime of the objectsrequiring them, rather than opening a new connection, executing code andthen closing it again. What is the most efficient way of doing this?Should I perform the open/close or just one open when I create the objectand a close when I dispose of it?
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Apr 6, 2006
Hi All,
I have a table call case and case_status have two fields, date and status as below:
date status
04/01/2006 open
04/05/2006 closed
04/10/2006 open
04/15/2006 closed
Whenever i open and closed the case, one record is insert into the case_status table.
Now I would need to calculate the total days of the case in storeprocedure.
Anyone can help me please.
Aung
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Apr 13, 2008
Just to verify that this was an issue, I downloaded web developer 2008 and I do not experience this same problem.
BUT when I go to add a dataset in vs2005 for an asp website - all my db files come up in the dialogue box but everyone that click (every db file) I get "This file is in use. Please enter a new name or close the file that's open in another program."
But, like I said, I downloaded 2008 and it does not occur. Plus I KNOW that the db's are not being used. Can someone give me a remedy to this?
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Dec 3, 2006
I am working on a stock price analysis project. Stock prices are stored in SQL Server as tick by tick data (that means in a high frequency) and need to be grouped by minutes in order to display them as as high, low, open and close prices in a candlestick or similar chart.
The fields in the table are:
Time (for every stock price tick)
Price (stock price)
Symbol (of the stock)
A sample time series would look like this:
11:45:01 $22.11 MSFT
11:45:02 $22.10 MSFT
11:45:04 $22.25 MSFT
...
...
...
11:45:58 $22.45 MSFT
11:46:03 $22.22 MSFT
11:46:08 $22.25 MSFT
...
...
...
11:46:59 $22.45 MSFT
The result of the SQL query should be:
Symbol Time Open High Low Close
MSFT 11:45 $22.11 $22.45 $22.10 $22.45
MSFT 11:46 $22.22 $22.45 $22.22 $22.45
This is the SQL statement I came up with but obviously doesn't work:
SELECT DATEPART(Minute,Time), MIN(Price), MAX(Price) FROM dbo.TimeSales WHERE Symbol='MSFT' GROUP BY DATEPART(Minute,Time)
I would appreciate any suggestions.
Thank you!
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Sep 7, 2007
I get the below error only when my IDE open. It connects well when it is found closed.
[SqlException (0x80131904): Cannot open user default database. Login failed.Login failed for user 'JPASPNET'.]
I could solve this by giving the logged in windows user to impersonate under IIS window > WEBSITE > ASP.NET tab > EDIT CONFIG > APPLICATION tab
But I wish someone could give me the proper solution.
I almost tried all from giving ASPNET user as a administrator to configuring the same in Express management tool.
Environment: XP pro, VWD and SQL Express
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Nov 3, 2014
Post installation of SQL Server 2014 Express edition, I am able to connect to the Database Instance.
But while opening a new query window in SSMS or opening a table getting the error:
Package 'RadLangSvc.Package, RadLangSvc, Version 12.0.0.0, Culture=Neutral, Public Token=89845dcd8080cc91' failed to load
Object reference not set to an instance of an object. (mscorlib)..Have already tried installing the componentsDACProjectSystemSetup_enu.msi, TSql LanguageService_enu.msi, DACFramework_enu.msi from path VS 2010 WCU DAC.
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Apr 26, 2007
I am accessing SQL2005 with C# code using OleDbConnection.
A try and catch block catches the following error once a while between the Open() and Close() of the connection:
ExecuteNonQuery requires an open and available Connection. The connection's current state is closed.
I do not even have any idea where to start to debug this. The ExecuteNonQuery() runs a delete SQL query. It works 99.9% of the time. I do not see anything wrong when this error happens.
Any hint would be greatly appreciated.
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Oct 20, 2007
Hi, I am new to ASP.NET and Visual Web Developer 2005 Express, which I run on Windows Vista. I am currently going through some of the tutorial videos on http://www.asp.net/learn/videos/ . I encountered an error in Lesson 04 and I would have ignored it but it keeps haunting me and now I cannot proceed with the lesson 09 all because of the same error. I would really appreciate it if somebody could help me resolve this because it.
General error text
The database filename can not contain the following 3 characters: [ (open square brace), ] (close square brace) and ' (single quote)
Lesson 4 circumstances
Web.Configis modified to contain the following code just before the closing </system.web> tag:<anonymousIdentification enabled="true"/><profile enabled="true"> <properties> <add name="MyNewProperty" allowAnonymous="true"/> </properties></profile>
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Nov 1, 2007
Hello everybody I would like to know more about the number of possible connection to a sql server is it by pool ? or there is max for all the database ? all the server ? how I can get the number of connection open ? Thx in advance
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Sep 22, 2007
Hi,
I hope this is right place to ask for help.If it is not, Please show me where and if it is please Help me
I using Window Vista bussiness, Microsoft visual 2005 professional edition, Microsoft SQL server express edtion
I have created table on Database.
My sql server name is KYAW-HQ
**but in the bar it shown like as KYAW-HQSQLEXPRESS
My data base name is kyaw
I have already Enabled Name Pipes and TCP/IP setting in sql studio management tool express
I using window authentication to log in to sql server management studio express.
My coding for c# is as follow:
private void button4_Click(object sender, EventArgs e)
{
//connect sql connection
SqlConnection con = new SqlConnection("Server=KYAW-HQ;Database=kyaw;UID=;PWD=;");
//open sql conection
con.Open();
SqlDataAdapter ad = new SqlDataAdapter("Select * From kyaw", con);
DataSet ds = new DataSet();
ad.Fill(ds, "kyaw");
dataGridView1.DataSource = ds.Tables[0].DefaultView;
con.Close();
}
After I click the button the error has shown like below
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server).
Please tell me what i have to do.
If someone read me, please tell me and advice me how to fix above problem.
Thanks
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Jan 22, 2008
Hello!
This code sample stops when I try to open a connection (see below). Ther error message reads "pipe provider , error 40". The help suggests that the credentials are wrong. I donīt think so, could there be another problem? Tough question but, I would appreciate any help.
System.Data.SqlClient.SqlConnection sqlConnection1 =
new System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings["SwimAdminConnectionString"].ConnectionString);
System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
cmd.CommandType = System.Data.CommandType.Text;
string sql1 = Session["txtFirstName"].ToString();
string sql2 = Session["txtLastName"].ToString();
cmd.CommandText = "INSERT dbo.Member (mbrFirstName, mbrLastName) VALUES (sql1, sql2)";
cmd.Connection = sqlConnection1;
sqlConnection1.Open(); //EXCEPTION HERE!!!
cmd.ExecuteNonQuery();
sqlConnection1.Close();
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Nov 25, 2007
Hi, Has somebody had a problem like this before? Exception Details: System.Data.SqlClient.SqlException:
An error has occurred while establishing a connection to the server.
When connecting to SQL Server 2005, this failure may be caused by the
fact that under the default settings SQL Server does not allow remote
connections. (provider: Named Pipes Provider, error: 40 - Could not
open a connection to SQL Server) That's part of the code: SqlConnection con; string sql; SqlCommand cmd; con=new SqlConnection("Data Source=elf/SQLEXPRESS;Initial Catalog=logos;Integrated Security=SSPI;"); sql="SELECT max(id_kandydat) from Kandydat"; con.Open(); cmd=new SqlCommand(sql,con); int id = Convert.ToInt32(cmd.ExecuteScalar()); con.Close(); SqlDataSource7.InsertCommand="INSERT INTO Kandydat_na_Kierunek(id_kandydat, id_kierunku, id_stan) VALUES ("+"'"+id+"'"+","+"'"+DropDownList1.SelectedValue+"'"+","+'1'+");"; I don't really get it. I'm nearly 100% sure that before some changes in my project this had worked perfectly. Does anybody have any idea how to make it work again? I would be very grateful for any help. And, yesy, I know it is quite common error, but proposed solution found didn't help.Regards,N.
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Jun 3, 2008
i m getting this exception
"An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"
i want to know that this exception is from my end or on Server End. because 5 to 6 month my application works fine but in these days i m getting this exception 5 to 20 times a day
your help will really appricate...
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Jun 14, 2006
hi to all,
I create a web application in asp.net with sql server 2000, I use always close connection in .net code as my consern but when run my application then visit page to page give a error "General network error " message . then i check lots of connection is sleeping state in process info in sql manegment(current activity) Now i open the particular processId in Process info show open connection with any storeprocedure name and show .net sqlclient data provoider referance as open connection which is fetch the data from sql then i check in code find really the connection which is got data by that store procedure is not close properly and i close it. This is ok but one problem is that some procesId show blank info with .net sql client data provoider. so how can i find where these conneciton is open in my applicaton because this processId doesn't give any clue for it , it show nothing only blank but status is sleeping. If any help have this context then quick feedback.
Thanks
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Feb 20, 2006
Hi,
One issue has got me stuck while getting to build an application(ASP.NET/SQLSERVER). Whenever I try to connect to SQL Server 2005 (installed on local host) using Visual Web Developer 2005 Databse Explorer, I get the following error message:
"An error has occured while establishing a connection to the server.
when connection to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - could not open a connection to SQL Server)"
NB:
- on SQL Servers' Surface Area Configuration, Remote connections are set to "Local and Remote connnections" and "Using both TCP/IP and named pipes".
ANyone with a solution? pse help
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May 8, 2007
I am developing a web service that uses a sql data connection.
The sql database is on a server, and the development version of my web service is on my pc.
I can connect/access the data accross my network when I run the service on my PC, but as soon as I put the web service onto the server(with the sql) it displays, the service wont function - error: 40 - could not open a connection....
I presume that sql is configured correctly as I am recieving data back when I request it accross the network. I dont understand why it wont work when I have the service on the server with the sql?
Any help will be appreciated.
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Jan 25, 2008
tried to install SQL Server 2005 in a fresh installed Windows 2003 SP2. And this server is a workgroup member, not a member of a domain.
The services (Database service, integration service, reporting services and so on) work fines, but I could not connect to server
I checked the log, I found the following error,error :40-Could not connect to SQL Server(Microsoft SQL Server,Error-1231).
I never had this problem and this time, I really got the trouble and do not have solution.
Who have ever encounter this problem? Or someone can help me?
Thanks.
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Sep 21, 2006
I'm trying to update an SQL DB from data in Quickbooks. I am trying to find if I can open a dsn connection in a stored procedure, called from an ASP page, to the quickbooks db using odbc. The driver I have for odbc does not allow for linked servers. I'm very new to stored procedures and such so please bear with me. Thxs.
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Apr 17, 2008
hello ,i write this code
string sql="SELECT * FROM Customers";
SqlConnection connection = CollectionManager.getHotelConnection();
SqlCommand command = new SqlCommand(sql,connection);
command.CommandType = CommandType.Text;
command.ExecuteNonQuery();
result = command.ExecuteScalar();
connection.Open();
...
and when the debug goes to
connection.Open ()
it throws me this
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
but i have all enabled ,browser running normally ,name pipes tcp ip enable all ,but it makes me this thsi all the time what mayb e huppens there?
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Dec 13, 2007
Hi,
I hope someone can help me with this.
I have created a data reader to loop thru a table and build an update statement.
Now I need to execute this statement in the datareader loop but the connection object is in use.
I tried creating another connection object but get an error:
"The context connection is already in use."
Is there a way to open another connection while the main context connection is open.
Just to make it clear, I do not want to read all the rows into memory first and then call update, it has to
happen for each iteration of the datareader.
Thanks.
--
With Regards
Shailen Sukul
Software Architect/Developer/Consultant
(BSc | Mcts (Biztalk (IP)) | Mcpd | Mcts (Web, Win, Dist Apps) | Mcsd.NET | Mcsd | Mcad)
Ashlen Consulting Services Pty Ltd
(http://www.ashlen.com.au)
MSN | Skype | GTalk Id: shailensukul
Ph: +61 0421 277 812
Fax: +61 3 9011 9732
Linked In: http://www.linkedin.com/in/shailensukul
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Feb 9, 2006
Try
Dim l_connString As String
l_connString = "Server=kangalert;database=Order;user id=sa;password=123;"
m_cn = New SqlConnection(l_connString)
m_cn.Open()
Catch ex As SqlException
Dim l_sqlerr As SqlError
For Each l_sqlerr In ex.Errors
MsgBox(l_sqlerr.Message)
Next
End Try
i got this in my mobile application, which try to open a connection directly to the sql server, but i got the following message
General Network error, check your network documentation.
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Dec 11, 2006
In my ssis package,
I have a DSN connection like this: "DSN=myDSNname". Which decide from i have to pull the data.
By using OLE DB Source Editor, I want to assign that ODBC Connection to it.
By data source Reader i can achive this but where i have to pass the hard-code SQL Query that i don't want.
i'm using the variable for dynamic SQL command.
Thanks.
Manoj
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Feb 12, 2007
Hi,
I've created an "ASP.NET Web Application" project in Visual Studio and I want to simply open a connection to a database in SQL Server. All I have done is adding these 3 lines below without modifying any other generated codes by Visual Studio.(I've done this within code behind in Page_Load() not by <script> tag within HTML code)
public class WebForm1 : System.Web.UI.Page { private void Page_Load(object sender, System.EventArgs e) { // Put user code to initialize the page here SqlConnection c = new SqlConnection(); c.ConnectionString = "workstation id=BABAK;integrated security=SSPI;initial catalog=db1;persist security info=False"; c.Open(); } ... }
But I get this error :
Server Error in '/projects/fortest/tDB2' Application.--------------------------------------------------------------------------------
Login failed for user 'BABAKASPNET'.
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 'BABAKASPNET'.
Source Error:
Line 24: SqlConnection c = new SqlConnection();Line 25: c.ConnectionString = "workstation id=BABAK;integrated security=SSPI;initial catalog=db1;persist security info=False";Line 26: c.Open();Line 27: }Line 28: Source File: c:inetpubwwwrootprojectsfortest db2webform1.aspx.cs Line: 26
What's wrong ?
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Jul 11, 2007
I posted this on the Dotnetnuke forums but no answer for it, so since it is a SQL error I guess maybe someone here might know.
I installed the core forum that comes with the installation, the page runs great until I add the forum module.
I get this error:
A critical error has occurred.An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
The portal is in godaddy if this can help.
Thanks,
Erick
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Nov 21, 2007
Hello,
I receive
this error when choosing the data connection in TableAdapter Wizard for me to
reference the ASPNETDB.mdf database.
Failed to open a connection to the database
"The header for file
'C:InetpubwwwrootWebsites4App_DataASPNETDB.MDF is not valid databasefile header. The FILE SIZE property is incorrect.An attempt to attach an auto-named database exists, or
specified file cannotbe opened, or it is located on UNC share."
Check the connection and try again.
I already have the connection at config but the error
persists.
...
<connectionStrings> <add
name="ConnectionString1" connectionString="Data
Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|mydatabase.mdf;Integrated
Security=True"providerName="System.Data.SqlClient" /> <add
name="ASPNETDBConnectionString1" connectionString="DataSource=.SQLEXPRESS;AttachDbFilename=|DataDirectory|ASPNETDB.MDF;Integrated
Security=True" providerName="System.Data.SqlClient" />
</connectionStrings> <system.web>... cheers,imperialx
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Feb 7, 2008
hI I have a website which is on a web server owned by another companyI have webpages which should connect from the web server to sql server 2000 which is based at my companyhowever I am getting the error messageAn error has occurred while establishing a connection to the server.
When connecting to SQL Server 2005, this failure may be caused by the fact that
under the default settings SQL Server does not allow remote connections.
(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL
Server) When the website was on citrix it connected fine, however once it has moved to a web server it does notI have checked and tcp/ip and named pipes are both enabled any1 any ideasthanks in advance!! :-)
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Mar 28, 2008
Hi, I have a web apllication using asp.net, I have two connectionstrings (cadenaCon and cadenaCon2) in web.config.
<connectionStrings> <add connectionString="Server=SUNBOGW-MROMEROSQLEXPRESS;Database=ModulosWebkkk;UID=sa;PWD=martha;" name="cadenaCon" providerName="System.Data.SqlClient" /> <add connectionString="Server=SUNBOGW-MROMEROSQLEXPRESS;Database=ModulosWeb;UID=sa;PWD=martha;" name="cadenaCon_bak" providerName="System.Data.SqlClient" /></connectionStrings>In the class file I have this sub and it works well
Public Sub New() conexion = New SqlConnection(ConfigurationManager.ConnectionStrings("cadenaCon").ConnectionString.ToString)End Sub
My problem is I like to try to connect with cadenaCon and if this connection fails use the other. I used a try but it donÂīt work,
Public Sub New() Try conexion = New SqlConnection(ConfigurationManager.ConnectionStrings("cadenaCon").ConnectionString.ToString) Catch ex As Exception Throw New Exception(ex.Message) conexion = New SqlConnection(ConfigurationManager.ConnectionStrings("cadenaCon_bak").ConnectionString.ToString) Finally End TryEnd Sub
Please I aprecitate a sugestion. Thanks
Martha
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Apr 19, 2008
HiI am connecting to an external web server running sql 2005 absolutly fine when testing a site using my localhost on my laptop. How ever, when i deploy the site to my server i get the error 40 code - the external database its trying to connect to is on a different server to both my own localhost and my own server.here is my connection string from my web.config: <add name="plightConnectionString" connectionString="Data Source=111.222.333.444;Initial Catalog=plight;Persist Security Info=True;User ID=xxxxxxx;Password=xxxxxxxx;" providerName="System.Data.SqlClient" /> I've googled the error but all answers require alterations to the server where the sql database is installed, and it works from my localhost anyway - is there anything i need to do to my own server which is running the website? Regards
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Nov 24, 2005
I'm using VS2005 and SQL2000. I created a database name "myDatabase" in
SQL Server 2000 and built a website that connet to this database. When
I'm running this website in VS2005 IDE (press F5 or Ctrl-F5),
everything is OK. I publiced this site. When I connect to database on
my computer, everything is OK also, but when I connect to database on
another computer, an error occurred like this :
"An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005,
this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.
(provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)"
Now, I don't know how to fix it. Pls help me as soon as possible.
Regards.
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