Problem Conecting To The Same DB From Two Applications
Apr 7, 2006
Hello,
I'm new to VB and SQL server. I have a windows forms application and a Web application that need to connect to the same database (Named WebCenter). But when I try to connect to it from the Web app while running the windows forms app this error message apears:
Unable to open the physical file "C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDataWebCenter_Data.MDF". Operating system error 32: "32(The process has no access to the file because is being used by another process).
Unable to open the physical file "C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDataWebCenter_Log.LDF". Operating system error 32: "32(The process has no access to the file because is being used by another process.)".
Cannot open database "WebCenter" requested by the login. The login failed.
Login failed for user 'CARLOS-PCASPNET'.
File activation failure. The physical file name "C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLDataWebCenter_Log.LDF" may be incorrect.
Can anyone give me hand or point me in the right direction.
Thanks,
Carlos.
Pd. Please excuse my english.
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Oct 18, 2000
i want to connect to remote sql server through ip address
iam using winnt server 4.0 and sql 7.0
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Feb 22, 2008
Hey
When i try to add a connection, as intructed in the tutorial video for visual basic 2008, it says "access to databasefile not allowed. [filename= c:program filesMicrosoft SQL server compact editionv3.5samplesorthwind.sdf"
Tried scrolling the forums for quite a while now, but can't seem to find anything helpfull, so please?
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May 29, 2007
hello
please can somebody help me.
I downloaded sql express a couple of days ago, first time using it.
I want to connect to it from visual studio , but i get an error message.
I can connect to an access database fine.
The Message i get is as follows from within visual studio
'generating user instances in sql is disabled. use sp configure 'user instances enabled' to generate user instances.'
My problem is i dont know were to go to to do this/enable it, or even if i have downloaded enough of the sql express package as there was about 4 options.
I hope i have posted my queston in the correct place.
I would like to thank you all in advance.
Many Thanks
Ian
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Apr 7, 2008
Hello,
i'v installed a pogram that uses SQLEXpress and reporting sevices on a clients computer. I can acces the reports wih http://localhost/reports$SQLEXpress from that computer, but i can't reach them from other computers in the netwok by typing http://servername/reports$SQLEXpress
i am asked to imput a pasword for user "servername/guest" (which i do not know and dont think there is one) and then get the following:
You are not authorized to view this page
You do not have permission to view this directory or page using the credentials you supplied.
Please try the following:
Click the Refresh button to try again with different credentials.
If you believe you should be able to view this directory or page, please contact the Web site administrator by using the e-mail address or phone number listed on the preactor home page.
HTTP 401.3 - Access denied by ACL on resource
Internet Information Services
What should i do to solve this problem?
Regards
Darius
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Here is the big problem:
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problem is that the first application that connects to the database, locks the database, and so the other application cannot use the database untill the other application is closed.
I am going on circles about this, and just don't know what to do.
Please please please. love me do.
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Thanks
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http://www.sqlserverstudy.com
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I can create a .cab file for the app using a setup project, but it eludes me what to install on the PPC of the customer, database wise.
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thx in advance,
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Nov 30, 2006
using System;
namespace BaResearch.Data.msSql
{
interface ISqlDataObject
{
System.Data.SqlClient.SqlConnection Connection { get; }
string ConnectionString { get; set; }
}
}
___________________________________using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
namespace BaResearch.Data.msSql
{
public class SqlDataObject : ISqlDataObject
{
private string _ConnectionString;
public SqlConnection Connection
{
get { return new SqlConnection(_ConnectionString); }
}
public string ConnectionString
{
get
{
return _ConnectionString;
}
set
{
_ConnectionString = value;
}
}
}
}
__________________________________using System;
namespace BaResearch.Data
{
interface IBid
{
string Client { get; set; }
string Contact { get; set; }
string Sponsor { get; set; }
string Priority { get; set; }
string BidStatus { get; set; }
}
}
_____________________________________________using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace BaResearch.Data.msSql
{
public class Bid : SqlDataObject, IBid
{
#region private member & variables
private int _BidID;
private string _DateCreated;
private string _CreatedBy;
private string _Client;
private string _Contact;
private string _Sponsor;
private string _Priority;
private string _BidStatus;
private SqlDataAdapter sqlda = new SqlDataAdapter();
private SqlCommand _command;
private SqlParameter[] _parameters =
{
new SqlParameter("@client",SqlDbType.NVarChar),
new SqlParameter("@contact",SqlDbType.NVarChar),
new SqlParameter("@sponsor",SqlDbType.NVarChar),
new SqlParameter("@priority",SqlDbType.NVarChar),
new SqlParameter("@bidstatus",SqlDbType.NVarChar),
};
#endregion
#region public member variables - stored procedures
//private string sp_Create = "bids_sp_insert";
//private string sp_Update_ByID = "bids_sp_updatebyid";
//private string sp_Delete_ByID = "bids_sp_deletebyid";
//private string sp_Select_All = "bids_sp_selectall";
//private string sp_Select_ByID = "bids_sp_selectbyid";
//private string sp_Select_ByValue = "bids_sp_selectbyvalue";
#endregion
#region constructors and destructors
public Bid()
{
if (this.ConnectionString == null)
{
this.ConnectionString = ConfigurationManager.ConnectionStrings["SQL.ConnectionString"].ConnectionString;
}
else
{
new Bid(this.ConnectionString);
}
}
public Bid(string ConnectionString)
{
this.ConnectionString = ConnectionString;
}
#endregion
#region methods & events
/// <summary>
/// Attach parameters to an SqlCommand
/// </summary>
/// <param name="sqlcmd">SqlCommand</param>
private void attachparameters(SqlCommand sqlcmd)
{
sqlcmd.Parameters.Clear();
foreach (SqlParameter param in _parameters)
{
sqlcmd.Parameters.Add(param);
}
}
/// <summary>
/// Assign value to the parameters
/// </summary>
/// <param name="sqlcmd">SqlCommand</param>
/// <param name="value">Client object</param>
private void assignparametervalues(SqlCommand sqlcmd, Bid value)
{
this.attachparameters(sqlcmd);
// todo: assign parameter values here
sqlcmd.Parameters[0].Value = value.Client;
sqlcmd.Parameters[1].Value = value.Contact;
sqlcmd.Parameters[2].Value = value.Sponsor;
sqlcmd.Parameters[3].Value = value.Priority;
sqlcmd.Parameters[4].Value = value.BidStatus;
}
public virtual void Create(Bid value)
{
_command = new SqlCommand();
_command.Connection = this.Connection;
_command.CommandText = @"INSERT INTO bids (client, contact, sponsor, priority, bidstatus, createdby)
VALUES (@client, @contact, @sponsor, @priority, @bidstatus, @createdby);";
_command.CommandType = CommandType.Text;
try
{
sqlda.InsertCommand = _command;
this.assignparametervalues(sqlda.InsertCommand, value);
sqlda.InsertCommand.Parameters.AddWithValue("@createdby", value.CreatedBy);
sqlda.InsertCommand.Parameters.Add("@bidid", SqlDbType.Int);
sqlda.InsertCommand.Parameters["@bidid"].Direction = ParameterDirection.ReturnValue;
sqlda.InsertCommand.Connection.Open();
sqlda.InsertCommand.ExecuteNonQuery();
sqlda.InsertCommand.Connection.Close();
sqlda.InsertCommand.Connection.Dispose();
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
public virtual int Update(Bid value)
{
int result;
_command = new SqlCommand();
_command.Connection = this.Connection;
_command.CommandText = @"UPDATE bids SET client=@client, contact=@contact, sponsor=@sponsor,
priority=@priority, bidstatus=@bidstatus
WHERE bidid=@bidid";
_command.CommandType = CommandType.Text;
try
{
sqlda.UpdateCommand = _command;
using (SqlCommand _cmd = sqlda.UpdateCommand)
{
this.assignparametervalues(_cmd, value);
_cmd.Parameters.AddWithValue("@bidid", value.BidID);
_cmd.Connection.Open();
result = _cmd.ExecuteNonQuery();
_cmd.Connection.Close();
_cmd.Connection.Dispose();
}
}
catch (Exception e)
{
throw new Exception(e.Message);
}
return result;
}
public virtual void Delete(Bid value)
{
_command = new SqlCommand();
_command.Connection = this.Connection;
_command.CommandText = @"DELETE bids WHERE bidid=@bidid;";
_command.CommandType = CommandType.Text;
try
{
sqlda.DeleteCommand = _command;
using (SqlCommand _cmd = sqlda.DeleteCommand)
{
_cmd.Parameters.AddWithValue("@bidid", value.BidID);
_cmd.Connection.Open();
_cmd.ExecuteNonQuery();
_cmd.Connection.Close();
_cmd.Connection.Dispose();
}
}
catch (Exception e)
{
throw new Exception(e.Message);
}
}
public virtual DataSet List(string filter)
{
DataSet result = new DataSet();
_command = new SqlCommand();
_command.Connection = this.Connection;
_command.CommandText = @"SELECT * FROM bids_view_listall
WHERE (clientname like @value) or (contactname like @value)
or (sponsor like @value) ORDER BY datecreated DESC";
_command.CommandType = CommandType.Text;
try
{
if (filter != null)
{
filter = filter.Replace(" ", "%");
}
sqlda.SelectCommand = _command;
sqlda.SelectCommand.Parameters.AddWithValue("@value", "%" + filter + "%");
sqlda.Fill(result);
}
catch (Exception e)
{
throw new Exception(e.Message);
}
return (DataSet)result;
}
#endregion
#region IBid Members
public string Client
{
get
{
return _Client;
}
set
{
_Client = value;
}
}
public string Contact
{
get
{
return _Contact;
}
set
{
_Contact = value;
}
}
public string Sponsor
{
get
{
return _Sponsor;
}
set
{
_Sponsor = value;
}
}
public string Priority
{
get
{
return _Priority;
}
set
{
_Priority = value;
}
}
public string BidStatus
{
get
{
return _BidStatus;
}
set
{
_BidStatus = value;
}
}
#endregion
#region Properties
public int BidID
{
get
{ return _BidID; }
set
{ _BidID = value; }
}
public string DateCreated
{
get
{
return _DateCreated;
}
set
{
_DateCreated = value;
}
}
public string CreatedBy
{
get
{
return _CreatedBy;
}
set
{
_CreatedBy = value;
}
}
#endregion
}
}
_____________________________________________
Am I on a right path? I will greatly appreciate in any comments or suggestions for a design. I am creating an n-tier application and i don't know if my design is right. I dont have the proper schooling for creating this kind of applications and I am still on layer of data access and business logic.
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Feb 7, 2007
Hi;
I have an ASP.NET application with a SQL Express database.Here is the connection string used on the web application:"Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|admindata.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"
Now, i create a Windows application which will run on the server to perform some scheduled tasks, for the Windows application I used this connection string:"Data Source=.SQLEXPRESS;AttachDbFilename=D:WebSitesmywebsite.comwwwApp_Dataadmindata.mdf;Integrated Security=True;User Instance=True"The problem is, when the web site is running and using the database, the windows application can't connect to the database and i don't know where i'm doing wrong, if it's the web application connection string or, if it's the windows application connection string.
I hope someone had the same experience and can point me to a direction.
Thank you;Emerson Brito
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Apr 28, 2008
Good morning,After long hours of search on the subject, I could not find a clear answer to my question.I understand what are ths physical limit fo the express version (1Gb or Ram, 4Gb database, 64 bit WOW).My configuration is as follow, windows webserver 64bit, I have 4 database of 10Mb each for 4 web-application. The maximum concurent connection is a total fo about 8 for all the web-application together.Therefore due to the cost of buying a workgroup of standard license, I was hoping to be able to use the express edition.Please let me know your thought.ThanksArno
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Jan 5, 2005
If I'm wanting to sell my Web Applications to clients that run using SQL Server, is it best to use a UserID and Password in the connection string, or would using Windows Integrated Security (SSPI) do? The reason I'm wondering is because I wouldn't know my customer's UserID and Password when they purchased one of my web apps, I would have to recompile the app with the new connection string (I'm not storing it in the web.config file)..
What is the best way to handle this on a global level, so that it would work on any system?
for example, would having the following connection string be a good idea for a production site?
string strMyConnectionString = " Data Source = (local); Integrated Security = SSPI; Initital Catalog = MyDBSource; ";
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