Solved

Creating flexible database Connections

Posted on 2004-04-19
5
301 Views
Last Modified: 2010-05-02
I am looking out for best way of creating database connections from VB to Oracle.

Using the following connection strings to the same database using differnt providers how can I make it flexible that users can log on to different datasources like "Development" to "Test" to "Production" so that my program automatically know what datasource they are connecting to.  

    With Conn
            .ConnectionString = "Provider=OraOLEDB.Oracle;" & _
                                        "User ID=abc;" & _
                                        "Password=xyz;" & _
                                        "Data Source=development;" & _
                                        "Persist Security Info=False"
            .CursorLocation = adUseClient
            .Open
    End With

        With m_conData
           .ConnectionString = "Provider=MSDAORA.1;" & _
                                        "User ID=abc;" & _
                                        "Password=xyz;" & _
                                        "Data Source=development;" & _
                                        "Persist Security Info=False"
            .CursorLocation = adUseClient
            .Open
        End With
0
Comment
Question by:jupiterz
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
5 Comments
 
LVL 52

Expert Comment

by:Ryan Chong
ID: 10862929
>>how can I make it flexible that users can log on to different datasources like "Development" to "Test" to "Production" so that my program automatically know what datasource they are connecting to.
Is that mean the user cannot log on to a database to determine whether they are connecting to a "Test" or a "Production" Oracle server (Because the application also donno where to connect..). Since then, what i can thinking off is set the connectionString as a value and save it into a Local File. The Local File can be as a INI File, an XML file, any user-defined file format, or even Registry. Where the user info of UserID, Password (optional, or can be compare/authenticate while connecting to Oracle Server that determine by ConnectServerType), and ConnectServerType is saved in the Local File.
0
 

Author Comment

by:jupiterz
ID: 10862957
Exactly that is what I want to do, but need code how to create this INI or XML file from VB.
0
 
LVL 52

Expert Comment

by:Ryan Chong
ID: 10863091
Some useful examples here on how to read/write values in a INI file:

Using INI Files to Save Application Data - The Basics
http://vbnet.mvps.org/code/file/pprofilebasic.htm

.INI File Reader and Writer
http://www.freevbcode.com/ShowCode.Asp?ID=4786

Read And Write From INI File Demo
http://www.freevbcode.com/ShowCode.Asp?ID=4578

Simple INI Read/Write Module
http://www.freevbcode.com/ShowCode.Asp?ID=2035

The format of your INI file should something like:

[User1]
UserName=user1
ConnectionString=Provider=OraOLEDB.Oracle;User ID=abc;Password=xyz;Data Source=development;Persist Security Info=False

[User2]
UserName=user2
ConnectionString=Provider=MSDAORA.1;User ID=abc;Password=xyz;Data Source=development;Persist Security Info=False

[User<N..>]
UserName=user<N...>
ConnectionString=Provider=OraOLEDB.Oracle;User ID=abc;Password=xyz;Data Source=development;Persist Security Info=False

* Where you need to read the available section in a Loop, stop the loop when the section is Not found.

For XML, you need to use the XML Object Library to parse the XML file. Let us know if you need XML examples.
0
 
LVL 9

Accepted Solution

by:
dancebert earned 500 total points
ID: 10863419
Saving passwords in plain text is not a good idea.  I store them as an encrypted string.  The program reads the encrypted string, decripts it into a plain text connection string, then connects to the database.
0
 
LVL 3

Expert Comment

by:redfordb
ID: 10867175
The method ryansys recommends is the way I do it, show a login screen with a combobox filled with the database names, a user name and password textboxes. Then just use the replace function to replace the abc of the connection string with the supplied username and the xyz with the supplied password. Then you dont need to store the passwords outside of the database.
0

Featured Post

Instantly Create Instructional Tutorials

Contextual Guidance at the moment of need helps your employees adopt to new software or processes instantly. Boost knowledge retention and employee engagement step-by-step with one easy solution.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you have ever used Microsoft Word then you know that it has a good spell checker and it may have occurred to you that the ability to check spelling might be a nice piece of functionality to add to certain applications of yours. Well the code that…
Enums (shorthand for ‘enumerations’) are not often used by programmers but they can be quite valuable when they are.  What are they? An Enum is just a type of variable like a string or an Integer, but in this case one that you create that contains…
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Get people started with the utilization of class modules. Class modules can be a powerful tool in Microsoft Access. They allow you to create self-contained objects that encapsulate functionality. They can easily hide the complexity of a process from…

734 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question