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MSSQL connection string

Posted on 2008-10-12
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Last Modified: 2013-12-17
Hi,

I use the following string to connect to MSSQL 2005 server (not express).

server=companysqlserver;database=companydatabase;user id=company;password=data

It works fine.

When I need to connect to a MSSQL2005 express with the machine and instance name:
COMPANYSQLSERVER\SQLEXPRESS

server=COMPANYSQLSERVER\SQLEXPRESS;database=companydatabase;user id=company;password=data

It cannot be connected.

I also tried
server=COMPANYSQLSERVER\\SQLEXPRESS;database=companydatabase;user id=company;password=data

and

server=.\SQLEXPRESS;database=companydatabase;user id=company;password=data


I use VC# and ASP.NET
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Question by:techques
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22 Comments
 
LVL 18

Expert Comment

by:jmoss111
Comment Utility
Maybe this will help you with your connect string:

http://connectionstrings.com/?carrier=sqlserver2005

Jim
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Expert Comment

by:Anthony Perkins
Comment Utility
And the error message is ...?
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Author Comment

by:techques
Comment Utility
cannot connect to DB
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Author Comment

by:techques
Comment Utility
I read http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_22846250.html

Seems SQL server is different from SQL server express which uses the following to connect:

sConnString = "Provider=SQLOLEDB;Data Source=Kobe\SQLEXPRESS;Initial Catalog=taghistory;User ID=sa;Password=YourPassword"

Should I change it?
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Expert Comment

by:Anthony Perkins
Comment Utility
>>cannot connect to DB<<
Yes, I understand that you cannot connect.  What we need is the exact error number and message you get when you attempt to connect.
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Expert Comment

by:David Todd
Comment Utility
Hi,

I typed in this example
http://msdn.microsoft.com/en-us/library/dw70f090(VS.80).aspx

I changed the GetConnectionString to
        static private string GetConnectionString() {
            return "server=myWorkStation\\Sql2005;database=PubsNew;Integrated Security=SSPI";
       
        }

HTH
  David
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Expert Comment

by:Anurag Thakur
Comment Utility
two things comming to my mind
1. is the sql server express instance on the machine is running
2. are the sql server 2005 network protocols for the sqlexpress instance enabled
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Author Comment

by:techques
Comment Utility
how to check those 2 things? I can login to the MSSQL 2005 server express and select data.

The following is the code to throw exception and it said "Thread Terminated"

I did not see this error before.


try

{

this.Add();

}

catch (Exception ex)

{

Response.Redirect("error.aspx?error1=" + ex.Message, true);

}
 

private void Add()   

{   

try   

{   

SqlHelper.ExecuteNonQuery(DBConnection.ConnString, CommandType.Text, this.SQL());   

}   

catch   

{   

Response.Redirect("dberror.htm");   

}   

finally   

{   

}   

}   

Open in new window

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Expert Comment

by:Anurag Thakur
Comment Utility
you can check the setting by opening "SQL Server Configuration Manager"
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Author Comment

by:techques
Comment Utility
I checked

1. is the sql server express instance on the machine is running
2. are the sql server 2005 network protocols for the sqlexpress instance enabled

both are yes
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Author Comment

by:techques
Comment Utility
any help?
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LVL 26

Expert Comment

by:Anurag Thakur
Comment Utility
Default Instance Connection String - "server=companysqlserver;database=companydatabase;user id=company;password=data"

SQL Express connection string "server=COMPANYSQLSERVER\SQLEXPRESS;database=companydatabase;user id=company;password=data"

seeing both the strings i can see that the databse is called CompanyDatabase
is this database available in both the instances or you are trying to connect to the companydatabase installed under Default instance from Sql Express instance.
Just a thought
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Author Comment

by:techques
Comment Utility
Yes, I need to connect to CompanyDatabase database

Actually, I do not know what is instance.

It should be default instance.

It is the forth day, still cannot find the solution to connect to it.

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Expert Comment

by:Anurag Thakur
Comment Utility
Open sql management studio
Connect to the default instance and see if the companydatabase is there (i think it was existing there)

Not connect to the sqlexpress instance and see if companydatabase exists there (i think it does not exist there thats why you are not able to connect)
If its not there then you might have to create or restore the db on the instance

All the instances in sql server are different and they do not share information amongst themselves and not even the databases
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Author Comment

by:techques
Comment Utility
I am not sure what did you mean because I cannot only login the sql server:
COMPANYSQLSERVER\SQLEXPRESS
So that I must see the companydatabase DB.

If I login with COMPANYSQLSERVER without \SQLEXPRESS, I cannot login.

So, I am not sure what did you mean 'Not connect to the sqlexpress instance'
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Expert Comment

by:Anurag Thakur
Comment Utility
its a typo
meant to say "Now connect to the sqlexpress instance"
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Author Comment

by:techques
Comment Utility
So, what is the connection string for sqlexpress?
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by:Anurag Thakur
Comment Utility
the question i asked was if you have a default sql server instance and a sqlexperss instance installed on the same server do you have companydatabase running on both of the instances - if you can give us the answer to this question we can give you the connection string.

in my previous comment i tried to ask the same question (ID:22711975) because to access a database from an instance the database should be available on that instance and the databases are not shared across instances
each sql instance is different from the other instance and so even the databases are.
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Author Comment

by:techques
Comment Utility
I checked the default instance in regedit
Microsoft SQL Server
Instance Names
SQL

SQLEXPRESS              MSSQL.1

So, both default and sqlexpress instances are the same.  

Then, what is the connection string should be?    

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by:jmoss111
Comment Utility
It appears that you have two instances: SQL and SQLEXPRESS.  The login without \SQLEXPRESS that doesn't work says thats a named instance and if you have anywhere in the setup or surface area configuration of Express to listen on 1433 you might have problems connecting.  Go to www.connectionstrings.com like I said in my earlier post any you will find all the options for 2000 and 2005.

Jim
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Author Comment

by:techques
Comment Utility
Hi

I read

http://blogs.msdn.com/sql_protocols/archive/2007/05/13/sql-network-interfaces-error-26-error-locating-server-instance-specified.aspx

and

http://blogs.msdn.com/sql_protocols/archive/2006/02/27/unable-to-connect-to-a-sql-server-named-instance-on-a-cluster.aspx

Set the firewall exception, enable tcp/ip, all those steps were done.

However, I still cannot use the connectionstring to connect to DB

even I use aspnet_regsql.exe  and it threw error: 40 - cannot open SQL Server connection

C:\>osql -E -S cluster\inst

[SQL Native Client]SQL Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF].

[SQL Native Client]Login timeout expired

SQL Browser service is running on the server





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techques earned 0 total points
Comment Utility
I fix it finally.

server=210.172.64.15\SQLEXPRESS,1329;database=companydatabase;user id=company;password=data

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