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Computer programming: create connection using provider factory,c# code

The new ADO.NET classes that allow for generic data access functionality-such as DBConnection, DbCommand, and so on -are grouped under the System.Data.Common namespace.
The first step in implementing database-agnostic data access is to use the DBProviderFactory class to create a new database provider factory object.

 DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.SqlCient");

This piece of code, because of the System.Data.SqlClient parameter passed, will have the factory object contain a SQLServer database provider factory ( the term factory generally refers to a class that builds class instances, or objects, for you). The System.Data.SqlClient string parameter is kept in a configuration file, allowing you to have c# code that really doesn't know what kind of database it's dealing with.

The database provider factory class is capable of creating a database-specific connection object through its CreateConnection method. However, you'll keep the reference to the connection object stored using the generic DbConnection reference:

 DbConnection conn = factory.CreateConnection();

The connection object will actually contain a SqlConnection object if the backend database in SQLServer, an OracleConnection if the backend database is Oracle, and so on. However, instead of working with SqlConnection or OracleConnection objects, we simply use DbConnection and let it decide at runtime what kind of object to create in the background.


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Memory representation of Linked List

             In memory the linked list is stored in scattered cells (locations).The memory for each node is allocated dynamically means as and when required. So the Linked List can increase as per the user wish and the size is not fixed, it can vary.

               Suppose first node of linked list is allocated with an address 1008. Its graphical representation looks like the figure shown below:

      Suppose next node is allocated at an address 506, so the list becomes,

  Suppose next node is allocated with an address with an address 10,s the list become,

The other way to represent the linked list is as shown below:

 In the above representation the data stored in the linked list is “INDIA”, the information part of each node contains one character. The external pointer root points to first node’s address 1005. The link part of the node containing information I contains 1007, the address of next node. The last node …