SQLExpresss Losing Connection To VB6 Application
Apr 2, 2007
I have a VB6 application that has MSDE as its current backend. In
testing moving to SLSQLExpress I've noticed, since this application is run on laptops, that if I disconnect the network cable while I'm in the VB6 app I lose "connection" to the database. If I end task on the app and restart it it works fine. If I reconnect the network cable while the app is running and then disconnect it the app runs fine. Also this happens when I'm connected to a wireless network and then disconnect and disable that connection.
In my template.ini file I have DISABLENETWORKPROTOCOLS=0. Is there a setting I'm missing? I can't seem to find anything else to set in the ini file.
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Sep 6, 2007
Hi,
I'm testing the use of application roles for security. The customer I work for has still a lot of ASP intranet applications running. We're migrating the databases to a SQL Server 2005 server.
I've changed the connection string to a user without any permissions but to log on. After that I use an application role for permission to select different tables and to execute Stored Procedures.
The first queries do execute but after that I get "Permission denied", like I haven't got the application role anymore.
Any ideas?
Adrian
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Apr 17, 2008
Hi - I am attempting to run an SSIS package through a SQL Agent job step. The package is fairly basic - I run some Execute SQL tasks, build an ADO recordset, enter into a For-Each loop, and perform some table updates based on the ADO recordset. So far so good. Approximately 1/3 of the records in my For-Each loop are processed, then I get a "Failed to acquire connection error". All I am doing for each iteration of the For-Each loop is updating one record in a table based upon the current value that is being processed from the ADO recordset. I am running the job on a 64-bit box, version 9.00.3050.00. I have also run this on two other 64-bit boxes (versions 9.00.1399.06 and 9.00.1406.00) and had the same issue. The owner of the Agent job is a sysadmin on the box. I don't understand why some items would be processed, then the connection drops mid-way through processing. What's even odder is the connection is dropped at the same point every time I run. The connection that I have defined in my package (I only have one connection defined in my package) is Provider type "Native OLEDBSQL Native Client", and I am using Windows authentication. The version of Visual Studio that I have developed this package in is 8.0.50727.42. Please help.
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Mar 5, 2008
Hi, I'm working on a project that connects to a database on every view of a site. It works fine for a few hours but eventually it just stops connecting to the database. There's nothing in the application logs to suggest where to look, it seems like the connections are just dying.
I am creating the connection in a pretty normal manner:SqlCommand myAwesomeCommand = new SqlCommand();myAwesomeCommand.Connection = new SqlConnection(myAwesomeConnectionString);myAwesomeCommand.CommandText = myAwesomeSQL;myAwesomeCommand.CommandType = CommandType.Text; // Otherwise known as awesomeText
myAwesomeCommand.ExecuteScalar();
I also use a SqlDataAdapter and fill it for some of my stuff for grabbing more complex data, but all happy System.Data.SqlClient stuff.
But yeah, the thing seems to just give up after a few hours. Everything I have read about connection pooling in ADO.Net says that the connections won't be reused. And yes, I believe I am closing all of my connections after I use them. The site is getting, oh, 7500 hits an hour maybe? Somewhere around that, maybe more maybe a little less.
Anyone have any ideas?
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Sep 11, 2007
On my SSIS package I have 2 connection managers, both are connecting to an Oracle db. I enter in the ID and Password then click 'test connection' I'm able to connect to the database fine. I then go to a data flow of one of my control flow task. Open up my OleDb Source and click preview. The SQL query executes with no issues. I can see the data from my connection manager source.
I then go and run the package and I get this error message:
[OLE DB Source [1]] Error: SSIS Error Code DTS_E_CANNOTACQUIRECONNECTIONFROMCONNECTIONMANAGER. The AcquireConnection method call to the connection manager "OracleConnection" failed with error code 0xC0202009. There may be error messages posted before this with more information on why the AcquireConnection method call failed.
I've been racking my brain on this for a few days and still no luck on getting this to work.
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Jul 12, 2006
Hi
I have two machines, the one has Windows 2003 server and the other has Windows Xp Pro on.
The 2003 one has SQL Standard Edition 2000 on where as the XP Pro has MSDE 2000.
I'm trying to run a windows based app from the 2003 server and it connects to a database on the XP Pro PC.
When running the application i keep getting the following exception:
"A Transport-Level error has occured when sending the request to the server (Provider: Named Pipes Provider, error: 0 - The specified network name is no longer available)
After using Preformance monitor on the XP machine it seems that when the app starts and the user logins in it make a SQL connection but then the connection is lost then the exception pops up. then i click continue and try it again then it works, then a couple of secs when using the system it pops up again. The Performance Monitor Test shows that the SQL connection keep being lost. The network is fine. its has something to do with SQL and Named Pipes and stuff.
When running the app on the Xp machine and the Connection is made to the 2003 machine there is no problem.
There are other connection made to the Windows XP Machine but i doubt that it affects the app.
The Windows firewall is off as well.
Please can anyone help.
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Aug 11, 2005
Dear members,I'am thinking about the "best" way to connect to my sql-server viaADO.Net (if there is a best way).My application uses the sql-server very intensively. At the momentevery database-operation opens a connection, executes and then closesthe connection.Another way would be to use only a single connection to the database,which is opened when the application starts.What do you think is the better way to get a high performing sqlserver: using one single application connection vs. using oneconnection for every operation?Cheers, Sebastian
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May 15, 2008
hi
i m making a win application
for which i have used sql server 2005 .i faced a very big problem that i have made the database but i cannot able to connect the database with winn application .for this purpose i ned coding.so please help me.i need your help urgent.
sheraz
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Jun 28, 2007
Hey anyone,
I got a problem to check a connection whether it is established or not from my C# Application to SQL Server.
I am developing my application which can run in 2 modes:
1. Online: There must be a connection to SQL Server to get new data updates.
2. Offline: I dont need a connection to SQL Server. I set a timer to tick every 5 seconds and it will check the connection with SQL Server and my problem here: (this is my code)1 public static bool checkConnection()
2 {
3 SqlConnection conn = new SqlConnection("mydatasource");
4 try
5 {
6 conn.Open();
7 return true;
8 }
9 catch (Exception ex) { return false; }
10 }
Yes, it works but my application seems to wait about >3 seconds to get the return "False"; I tried to add "Connect TimeOut=1" in my Connection String, but the problem is still there.
I dont know whether there is a faster way to check the connection to SQL server which is established or not.
Thank you very much,
Joesy
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Sep 27, 2007
In my asp.net application , I have to open/close SQL databse connection many time, and I dont want to declare Following variable everytime I open SQL database connection
Dim cntec As New SqlClient.SqlConnection(cnStrtec)
Dim datec As New SqlClient.SqlDataAdapter
Dim dstec As New DataSet
Dim cmdtec As New SqlClient.SqlCommand
so do I decalre above variable in module.vb as Public variable or is there any other way to do this.
Please some one give me idea how to do this
thank you
maxmax
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Sep 27, 2007
In my asp.net application , I have to open/close SQL databse connection many time, and I dont want to declare Following variable everytime I open SQL database connection
Dim cntec As New SqlClient.SqlConnection(cnStrtec)
Dim datec As New SqlClient.SqlDataAdapter
Dim dstec As New DataSet
Dim cmdtec As New SqlClient.SqlCommand
so do I decalre above variable in module.vb as Public variable or is there any other way to do this.
Please some one give me idea how to do this
Please give me some examples
thank you
maxmax
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Nov 12, 2007
Hi there,
Has anyone ever encountered problems making .Net applications connect to a SQL database on SQL 2000 with SP3a?
It's running on a virtual machine with a Windows Server 2000 Std with SP4, the .Net application is working with .Net Framework 1.1.4322.573. For some reason it can't connect to the SQL database using the specified username and password in the web.config file even though the user exists in the SQL database. I've tried using the SA password but this still doesn't work. I can logon to SQL Query Analyzer using the SA password but not using the other username.
The .Net application does work on other systems of mine all of which can run on Windows Server 2000 and 2003, I have compared them but can't find any differences.
Any ideas anybody?
Thanks,
Chris
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Jun 11, 2008
I have application that is connecting to SQL Server and runs bunch of stored procedures, but I don't think that am able to connect to my database server. When it hits the line to execute the stored procedure it comes up with syntax error saying the syntax error is at the stored procedure. I know how to set up the connection string with web app from the web config, but never done it on an app. Here is the connection string pointing to my server which I pass to my SqlConnection object: "Data Source=ServerXXXX;Initial Catalog=DB;Integrated Security=True; User ID=xxxx; Password=xxxx;" And that is the code that is using the above connection string: Public Sub MigrateNFSData(ByVal calcTbl As DataTable, ByVal strDBConnection As String) Dim sqlServerConn As New SqlConnection(strDBConnection) 'Define stored procedures Dim command As New SqlCommand Dim getAccID As New SqlCommand("GetAccountID", sqlServerConn) Dim getActionID As New SqlCommand("GetActionID", sqlServerConn) Dim getExchangeID As New SqlCommand("GetExchangeID", sqlServerConn) 'Dim getParrentAccID As New SqlCommand("GetParentAccID", sqlServerConn) Dim getStatusID As New SqlCommand("GetStatusID", sqlServerConn) Dim getTraderID As New SqlCommand("GetTraderID", sqlServerConn) Dim getGroupID As New SqlCommand("GetGroupID", sqlServerConn) 'Define insert records stored procedures Dim insertAcc As New SqlCommand("InsertAccount", sqlServerConn) Dim insertAction As New SqlCommand("InsertAction", sqlServerConn) Dim insertExchange As New SqlCommand("InsertExchange", sqlServerConn) Dim insertGroup As New SqlCommand("InsertGroup", sqlServerConn) Dim insertStatus As New SqlCommand("InsertStatus", sqlServerConn) Dim insertTrader As New SqlCommand("InsertTrader", sqlServerConn) Try sqlServerConn.Open() Catch ex As Exception 'Exception message goes here End Try 'Set parameters to helper Get Stored Procedures to retreive Id's getAccID.Parameters.Add("@AccName", SqlDbType.NVarChar) getAccID.CommandType = CommandType.StoredProcedure getActionID.Parameters.Add("@ActionName", SqlDbType.NVarChar) getActionID.CommandType = CommandType.StoredProcedure getExchangeID.Parameters.Add("@ExchName", SqlDbType.NVarChar) getExchangeID.CommandType = CommandType.StoredProcedure 'getParrentAccID.Parameters.Add("@ParentName", SqlDbType.NVarChar) 'getParrentAccID.CommandType = CommandType.StoredProcedure getStatusID.Parameters.Add("@StatusName", SqlDbType.NVarChar) getStatusID.CommandType = CommandType.StoredProcedure getTraderID.Parameters.Add("@TraderName", SqlDbType.NVarChar) getTraderID.CommandType = CommandType.StoredProcedure getGroupID.Parameters.Add("@GroupName", SqlDbType.NVarChar) getGroupID.CommandType = CommandType.StoredProcedure command = New SqlCommand("InsertTradeTransaction", sqlServerConn) command.CommandType = CommandType.StoredProcedure 'Set Parameters for Insert stored procedures insertAcc.Parameters.Add("@Account", SqlDbType.Text) insertAction.Parameters.Add("@ActionName", SqlDbType.Text) insertExchange.Parameters.Add("@Exchange", SqlDbType.Text) insertGroup.Parameters.Add("@Group", SqlDbType.Text) insertGroup.Parameters.Add("@ACCID", SqlDbType.Int) insertStatus.Parameters.Add("@StatusName", SqlDbType.Text) insertTrader.Parameters.Add("@Group", SqlDbType.UniqueIdentifier) insertTrader.Parameters.Add("@IP", SqlDbType.Text) insertTrader.Parameters.Add("@TraderName", SqlDbType.Text) 'Adding stored Get Stored Procedure's parameters----------------------- command.Parameters.Add("@OrderNum", SqlDbType.Text) command.Parameters.Add("@ACC_ID", SqlDbType.Int) command.Parameters.Add("@Group_ID", SqlDbType.UniqueIdentifier) command.Parameters.Add("@Trader_ID", SqlDbType.UniqueIdentifier) command.Parameters.Add("@Exch_ID", SqlDbType.Int) command.Parameters.Add("@Date", SqlDbType.DateTime) command.Parameters.Add("@Time", SqlDbType.DateTime) command.Parameters.Add("@ActionID", SqlDbType.Int) command.Parameters.Add("@StatusID", SqlDbType.Int) command.Parameters.Add("@TimeSent", SqlDbType.DateTime) command.Parameters.Add("@Qty", SqlDbType.Int) command.Parameters.Add("@Product", SqlDbType.Text) command.Parameters.Add("@MMYYY", SqlDbType.Text) command.Parameters.Add("@ExchOrderID", SqlDbType.Text) command.Parameters.Add("@TimeTicks", SqlDbType.Int) command.Parameters.Add("@W2G", SqlDbType.Int) command.Parameters.Add("@W2Exch", SqlDbType.Int) command.Parameters.Add("@G2ExchDerived", SqlDbType.Int) command.Parameters.Add("@ExchDate", SqlDbType.DateTime) 'command.Parameters.Add("@ParentID", SqlDbType.Int) 'Paremeters Defenition-------------------------------------- 'Write table with computed NFS data to sql server DB For Each dr As DataRow In calcTbl.Rows command.Parameters("@OrderNum").Value = dr.Item("OrderNo").ToString() getAccID.Parameters("@AccName").Value = dr.Item("Acct").ToString() If getAccID.ExecuteScalar() = 0 Then insertAcc.Parameters("@Account").Value = dr.Item("Acct").ToString() insertAcc.ExecuteNonQuery() //THIS IS WHERE IT FAILS and pops up with the message that there is syntax error at this procedure getAccID.Parameters("@AccName").Value = dr.Item("Acct").ToString() command.Parameters("@AccName").Value = getAccID.ExecuteScalar() Else command.Parameters("@ACC_ID").Value = getAccID.ExecuteScalar() End If getGroupID.Parameters("@GroupName").Value = dr.Item("GroupID").ToString() Try command.Parameters("@Group_ID").Value = getGroupID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getTraderID.Parameters("@TraderName").Value = dr.Item("TrdID").ToString() Try command.Parameters("@Trader_ID").Value = getTraderID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getExchangeID.Parameters("@ExchName").Value = dr.Item("Exch").ToString() Try command.Parameters("@Exch_ID").Value = getExchangeID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getActionID.Parameters("@ActionName").Value = dr.Item("Action").ToString() Try command.Parameters("@ActionID").Value = getActionID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try getStatusID.Parameters("@StatusName").Value = dr.Item("Status").ToString() Try command.Parameters("@StatusID").Value = getStatusID.ExecuteScalar() Catch ex As Exception 'Insert new Account if given account not being found from get stored procedure End Try 'getParrentAccID.Parameters("@ParentName").Value = "" 'Try 'command.Parameters("@ParentID").Value = getParrentAccID.ExecuteScalar() ' Catch ex As Exception 'End Try command.Parameters("@Date").Value = DateTime.Parse(dr.Item("Exch Date").ToString()) command.Parameters("@Time").Value = DateTime.Parse(dr.Item("Time").ToString()) command.Parameters("@TimeSent").Value = DateTime.Parse(dr.Item("Time Sent").ToString()) If (dr.Item("Qty").Equals(System.DBNull.Value)) Then command.Parameters("@Qty").Value = System.DBNull.Value Else command.Parameters("@Qty").Value = Int32.Parse(dr.Item("Qty").ToString()) End If command.Parameters("@Product").Value = dr.Item("Product").ToString() command.Parameters("@MMYYY").Value = dr.Item("MMYYYY").ToString() command.Parameters("@ExchOrderID").Value = dr.Item("ExchOrderID").ToString() If (dr.Item("TimeTicks").Equals(System.DBNull.Value)) Then command.Parameters("@TimeTicks").Value = System.DBNull.Value Else command.Parameters("@TimeTicks").Value = Int32.Parse(dr.Item("TimeTicks").ToString()) End If command.Parameters("@ExchDate").Value = Date.Parse(dr.Item("Exch Date").ToString()) command.Parameters("@W2G").Value = 2 command.Parameters("@W2Exch").Value = 2 command.Parameters("@G2ExchDerived").Value = 2 command.ExecuteNonQuery() sqlServerConn.Close() Next End Sub Thank you guys as always being helpful.
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Nov 24, 2003
Hello,
I was wondering if someone could help me answer this question.
If I had a site like Yahoo, that constantly had users accessing it. Would it be a good or bad idea to automatically open a database connection to SQL Server on Application Start? What would you recommend? Would opening and closing the DB connection on every page save alot of overhead and bottleneck? Thank You.
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Jul 23, 2005
Is there a way that SQL can automatically look at each users'connection and make sure it is still connected through the third partyapplication? The problem is that when a connection to this applicationis not terminated properly, the SQL server is not notified of thedisconnect and the user cannot log back into the application until allthe processes are completed and the original session terminated.Thank you.
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Jun 30, 2015
The application server gets below error while the job is being run intermittently:
An error occurred while performing connection management
com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:171)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.checkClosed(SQLServerConnection.java:319)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.prepareStatement(SQLServerConnection.java:1839)
[Code] ....
There is no error reported in SQL logs.
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Mar 20, 2008
I have VB6 application on several desktops connected to SERVER A (SQL Server 2005) in TESTING. I know I can change some registry values in VB6 application to connect it to SERVER B(SQL Server 20050 in PRODUCTION.
but it is work on each and every desktop.
Is there any way to do something on SQL Server 2005 Engine end (like Alias) so I don't have to make changes for SERVER Redirection in each and every Desktop machine(client), and Just I make change on SERVER Side.
any help or idea on that?
Thanks,
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Mar 30, 2008
I am getting this error
"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)"
in SQL EXPRESS 2005
1.Just changing the service config settings that is TCP/IP to enable will it work?i changed i run my application but it didn't work they have written the code to the server(connection string to their server- if it was to common how to write the code ?) & is there any other changes ?
2.I have developed a VB.NET EXE file -In that application(inside the code) i am using run time connection string queries to connect to the sql server database & created run time tables.
Suppose if i want to install the application to all clients/users how to Configure that application - self configuration/self installer to the installing machine SQL SERVER.
How can i do this ?
3.Is there any way i can write config file for sql server along with exe application code ? How can i do this ?
Pls answer with details/screenshots or diagramatical (if possible)
pls reply asap
Dotnetnewbie
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Nov 10, 2006
Hey everyone, I'm new to .NET and I've recently inheirited a rather large and busy asp.net website. I was asked to add a testimonials section on each page that will randomly pull a testimonial out of the db. This is fine, however, I'm getting random errors about the DB connection either being closed or connecting. Here is the code for the testimonials class: 1 public SqlDataReader GetTestimonials(ref SqlDataReader reader, int iCatID, string sLanguageType)2 {3 SqlCommand cmd = new SqlCommand("sp_DVX_Testimonials_Fetch", Connection);4 cmd.CommandType = CommandType.StoredProcedure;5
6 cmd.Parameters.Add(new SqlParameter("@Cat_ID", iCatID));7 cmd.Parameters.Add(new SqlParameter("@LanguageType", sLanguageType));8
9 reader = cmd.ExecuteReader();10
11 return reader;12 } I know this isn't the best way to do this (especially for each page[this site averages about 1000 hits a day]), so I was wondering was--is there a way to maintain a single DB connection that's set up in the Application_Start that will maintain the connection so I don't have to worry about this error. If not, does anyone and any ideas as to what would help? Thanks in advance!
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Feb 7, 2008
OK
We have always used sql servwer login to the servers for all our applications for out intranet apps
And we use windows auth to do development
So when we do that we logon to wuindows, and then just connect, with no password required
But how does an application "logon" to connect to a database
Is it just in the connection string just like sql server auth
or is it different?
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Jan 21, 2008
Hi,
I'm writing a windows application using VB.NET 2005 that must connect to Pocket PC via ActiveSync to read data from SQL Server CE. This is my code:
Dim cnn As New SqlCeConnection
cnn.ConnectionString = "Data Source =Mobile DeviceStorage CardProgram FilesMyAppMobileDB1.sdf"
cnn.Open()
But I get the following error:
The path is not valid. Check the directory for the database. [ Path = Mobile DeviceStorage CardProgram FilesMyAppMobileDB1.sdf ]
Any help would be greatly appreciated!
Leila
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Oct 15, 2007
Hi Sir
In My web application i am using the ".UDL" file functionality.
<![endif]--><!--[if !vml]-->The Select Provider tab will be used to allow users to specify the OLE DB Provider to be used for the connection. now i am able to get all provides available in system. But i have a problem how to get the cossesponding connection tab at runtime.
please save, i am in crusial stage.
Thanks In Advance.
etlu me srinu
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Apr 21, 2008
Hi all,
I think I can do this, just want to check
Can I have an sql server database (mdf file) on a server and allow windows applications at different site manipulate the database.
As far as I am concerned the only thing that needs to be configued is the connection string..is this correct.
[i would rather use windows applications rather than asp pages]
If I can, the best way to manipulate the database is to use stored procedures. How would I do the following to create and execute the following proposed procedure:
Insert data into a table
Update another table as a result
Execute the store procedure on a form to execute these two statements
Thanks in advance
Peter
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Jun 5, 2007
All:
I am writing an Internet/Extranet based (ASP.Net 2.0) web application that uses SQL server 2005 as the database. I am using forms authentication on my web application. I am also storing the connection string to SQL server in my web config file. The conn string is encrypted using DPAPI with entropy. I currently have created a SQL login account on my SQL server for use by the web application. This is the user ID I am using in my conn string. The reason for this is because all persons using the application will NOT have a windows login.
Here is my question: The login I created currently has defaulted to the "dbo" role and therefore has "dbo" rights to the database. I want to setup up this login account so that all it can do is execute stored procedures. I dont want this SQL login to be able to do anything else. In my application I am using stored procedures for ALL data access functions, via a data access layer in my application. Can someone guide me step by step as to how to setup this type of access for this SQL login.
Thanks,
Blue.
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Oct 22, 2007
How do i know whether the connection is open with the sqlserver database while work in the application?
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Jun 3, 2008
plz help me...
when establishing a connection to the server. when connecting to server 2005, this failure may be caused by the fact that under the default setting SQL Server does not allow remote connections.(provider: Named pipes provider, error:40 - could not open a connection to sqlserver)
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Aug 2, 2006
Hi,I have a problem, when I want to access to my SQL Server Expressdatabase from my ASP.NET application.My workstation ID is KITOLAP-HPMy username is user01Now I built the following connection String (VB.NET):Dim workstation As String =System.Environment.GetEnvironmentVariable("computername")connectionString = "workstation id=""" & workstation & """;packetsize=4096;user id=user01;integrated security=SSPI;data source=""" &workstation & "SQLExpress"";persist security info=True;initialcatalog=webshop"connection = New SqlConnection(connectionString)Although I put as user id "user01" the application makes an error whenI try to open the connection, saying that the login with user "aspnet"failed.How can I change it so that as login-user "user01" is taken and not"aspnet" or otherwise, how can I create a new user in the SQL Serverdatabase with which I could access the DB??thanks,kito
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Sep 19, 2007
I am running multiple instance of the same application. This application is connecting to the database and running stored procedures using ADODB (all code examples are taken from msado15).
The problem is that somehow these two applications are sharing something either with the connection or commands.
For instance if the two instances are in the following function at the same time then they both thow an SEH exception:
Code Snippet
inline _RecordsetPtr Command15::Execute ( VARIANT * RecordsAffected, VARIANT * Parameters, long Options ) {
struct _Recordset * _result = 0;
HRESULT _hr = raw_Execute(RecordsAffected, Parameters, Options, &_result);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
return _RecordsetPtr(_result, false);
}
The exception that occurs is: "First-chance exception ...: 0xC0000005: Access violation reading location 0x00000068."
And afterwords when they go to release the command an error occurs on
First-chance exception at 0x4de4120c in IpsEngine.exe: 0xC0000005: Access violation reading location 0xcccccccc.
Code Snippet
inline void _bstr_t::Data_t::_Free() throw()
{
if (m_wstr != NULL) {
::SysFreeString(m_wstr);
}
if (m_str != NULL) {
delete [] m_str;
}
}
This is being called from.
Code Snippet
inline void Command15::PutRefActiveConnection ( struct _Connection * ppvObject ) {
HRESULT _hr = putref_ActiveConnection(ppvObject);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
}
The exception that occurs: First-chance exception at ...: 0xC0000005: Access violation reading location 0xcccccccc.
Similarly when one instance releases a command using
Code Snippet
inline void Command15::PutRefActiveConnection ( struct _Connection * ppvObject ) {
HRESULT _hr = putref_ActiveConnection(ppvObject);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
}
The second instance of the application fails when running the command at the exact same time.
Code Snippet
inline _RecordsetPtr Command15::Execute ( VARIANT * RecordsAffected, VARIANT * Parameters, long Options ) {
struct _Recordset * _result = 0;
HRESULT _hr = raw_Execute(RecordsAffected, Parameters, Options, &_result);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
return _RecordsetPtr(_result, false);
}
The command and connections are not static and there should be completely seperate instances of these for each instance of the application. Does anybody know why this may be happening. Any help would be appreciated. Thanks in advance.
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Jun 29, 2006
Hi all, I was just wonder what the normal memory consumption is when just simply making a connection to a database. I have an application that starts, and when it connects the to a database, it eats up around a 1.5 MB, yes I keep the connection open for the life of the application (as its in a kinda global class, and when database reads/writes are performed I just get the open connection object) - I don't run any queries against the database here, just connect.
Is this a normal amount of memory to consume on a simple connection to a database?
Tryst
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Apr 15, 2008
Hi,
I'm writing an application with Visual Studio 2005 (Visual Basic .NET 2.0) which uses a SQL Compact Edition 3.5 database. On my HTC Touch with Windows Mobile 6.1 installed the application crashes, without any error message, if I try to open a connection. But...On the Windows Mobile 6 Pro emulator the connection opens normaly. The whole application runs perfect.
On both "devices" are the same dll's, of version 3.5.0.0.
I'm using the following code to open the connection:
Code Snippet
Private mySQLce_strConnection As String = "Data Source ='" & App_Path() & "MControl_SQLce.sdf" & "';"
Dim localConnection As New SqlCeConnection(mySQLce_strConnection)
localConnection.Open()
I tried so many things but without any success. But...I'm able to open the database (MControl_SQLce.sdf) with the Query Analyzer 3.5 on the Mobile. No problem.
This is my configuration:
Dev PC:
Windows XP SP2
Visual Studio 2005 Pro
.NET Framework 2.0 SP1
.NET Compact Framework 2.0
SQL Server Compact Edition 3.5 (this version I reference to in my VS project)
Mobile Device (HTC Touch):
Windows Mobile 6.1
SQL Server Compact Edition 3.5
Any suggestions? I can't figure this out.
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Nov 30, 2015
My application supports a single database connection and in the app console I can produce reports. If I include the app database in an AlwaysOn availability group with a read-intent replica will SQL automatically route the “selects” to that second instance thus offloading my application’s reporting activities or I need a separate db connection (maybe from a reporting app or cli) with a connection specifying read-only intent?
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Oct 19, 2007
for example : " server={0};database={1};trusted_connection=true;application name={3}"
The article SqlConnection.ConnectionString Property refer this term,but doesn't specify use.
I want to know whether it will affect sql server and how to find its effect
thanks
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Oct 28, 2015
issues with triggers in Sql Server 2014.
A few weeks ago I've done a SQL Server migration from SQL Server 2000 to SQL Server 2014.It was a bit tricky but anything worked fine.
I have some legacy VB6 (Visual Basic 6) applications written in house which worked with Databases on the old SQL server 2000.Surprisingly, these applications worked well after the upgrade to SQL Server 2014 without having to change a piece of code.
Now, some users tell me that they receive some unusual message when saving data from these legacy applications.After investing for a few hours, I discovered that triggers are not executed when those users try to save data from grids or forms in their applications.Trying to reproduce the INSERT statement in SQL Server Management Studio, the triggers run well.From the application, they don't.
These applications connect to Database Server thru OLEDB connection with the following ADO connection string :
Provider=SQLOLEDB.1;Password={password};User ID={user};Initial Catalog={db};Data Source={datasource}.the {user} is a true SQL account who have read/write/delete access in the databases.
On the web there is a lot of questions involving the same issue, but only from SSIS.I found some articles about an OLEDB connection parameter named FastLoadOptions with a value of FIRE_TRIGGERS, but nowhere how to put it in the ADO OLEDB connection string.
how to reactivate the "normal" use of triggers from an ADO OLEDB connection ?Either with some obscur parameter in the connection string or options somewhere in the SQL Server 2014.
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