Question

different datbase by binding soruce

Asked by: abdallah1973

Dear all,

kindly, I understand that the databinding source which create tha adapter can connect with different database in the same time if you change you connectionstring.

do you think if I keep another database of SQL in the type of Oracle 10 G will obtian me to do some changes in tables and triggers or any other thing will make my project troubles.

Please feed us with samples changes needed1

Please recommand us.

Thanks

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Asked On
2009-09-24 at 08:07:05ID24758728
Topics

Visual Studio

,

Microsoft Visual Basic.Net

Participating Experts
1
Points
500
Comments
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Answers

 

by: Priest04Posted on 2009-09-24 at 23:33:52ID: 25420428

BindingSource is not database dependant (like DataTable and DataSet arent). But in order to use different datasource, you would need differemt connection objects, different tableAdapters, Command objects, DataReaders, etc. You can easily distinguish which is DBMS dependant by looking at the namespace they belong to. For example, everything that is in System.Data can be used with any DBMS. Everything that is in System.Data.SqlClient can be used with SQL Server only.

You can work with interfaces if you want to be DBMS independent. For example, you could use IDataReader instead of SqlDataReader, IDbTransaction instead of SqlTranscation, etc. IDataReader is inherited by both SQL Server and Oracle Data Readers. And the same thing for every class thay is DBMS dependant

here is one example how you can create DBMS independent data access layer

http://aspalliance.com/837_Implementing_a_Data_Access_Layer_in_C.

Goran

 

by: abdallah1973Posted on 2009-09-25 at 08:25:05ID: 25423976

The article is good and it help but the matter is that I need use it with vb.2005 not vb.net 2003


The idea that I need confirm specailly when I create a bindingsource the system will ask to create connection then I will select (OLE, ODBC, ORACLE, SQL)
The VB.net 2005 will create data adapter that connect to that type of connection and also show the table from the desire database belong to that connection withing the wizzard that help you to create full till you reach the final dataset.

I am planing to change the source of connection using parameters

if connectypes="Oracle" then
   Me.Users_settingsTableAdapter.Connection.ConnectionString = strconnection1
elseif connectypes="SQL" then
   Me.Users_settingsTableAdapter.Connection.ConnectionString = strconnection12
elseif connectypes="Access" then
   Me.Users_settingsTableAdapter.Connection.ConnectionString = strconnection1


Are this correct?
if it's correct ? do I need to make any extra changes in database or in the connection settings.


thanks

 

by: Priest04Posted on 2009-09-25 at 09:16:26ID: 25424459

If you look at the generated code for typed dataset, you can see that several objects are created which exist in System.Data.SqlClient

System.Data.SqlClient.SqlDataAdapter _adapter;
System.Data.SqlClient.SqlConnection _connection;
System.Data.SqlClient.SqlTransaction _transaction;
System.Data.SqlClient.SqlCommand[] _commandCollection;

All this objects are used with SQL server Provider, and are not supposed to be used with Oracle Provider. So, in order to make it work with both databases, you would need to create Oracle versions of these objects, and this, as you expect, leads to very confusing code which is hard to maintain. This is where DAL comes to scene. Its implementation is not trivial, but when you are done with it, you have ready-to-go interface that can interact with most DBMS and do CRUD operations.

Where exactly did you see that the article I provided is using framework 1.1?

 

by: abdallah1973Posted on 2009-10-22 at 17:39:58ID: 31633037

Nill

20120131-EE-VQP-002

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