Implementation of Abstract Factory Pattern
Introduction
This blog will discuss the Implementation of Abstract Factory Design
Pattern. Using this example you can connect any type of database provider
without any changes in code.
About Abstract Factory
Abstract
factory pattern is useful when client need to create “Which are somehow
related”. If we need to create a family of related or dependent object then the
use of abstract factory pattern
Step 1:
Database Setup
Create table name EMPLOYEE with column name EMP_ID and EMP_NAME.
We will create a service to input the user id and get the name of the employee.
SET
ANSI_NULLS ON
GO
SET
QUOTED_IDENTIFIER ON
GO
SET
ANSI_PADDING ON
GO
CREATE
TABLE [DBO].[EMPLOYEE](
[EMP_ID] [INT]
NULL,
[EMP_NAME] [VARCHAR](50)
NULL
)
ON [PRIMARY]
GO
SET
ANSI_PADDING OFF
GO
INSERT
INTO EMPLOYEE(EMP_ID,EMP_NAME)
VALUES(1,'AMIT')
INSERT
INTO EMPLOYEE(EMP_ID,EMP_NAME)
VALUES(2,'SONU')
INSERT
INTO EMPLOYEE(EMP_ID,EMP_NAME)
VALUES(3,'RAM')
Step 2: Create a Console Application
using
System;
using
System.Data.Common;
//Impelentation
of Abstract factory patteren
public
class
ashish
{
public static
DbConnection CreateConnection(string
provider, string connection)
{
DbConnection con =
null;
if (con == null)
{
try
{
DbProviderFactory dp =
DbProviderFactories.GetFactory(provider);
con =
dp.CreateConnection();
con.ConnectionString = connection;
}
catch (Exception
e1)
{
Console.WriteLine(e1.Message);
}
}
return con;
}
}
class
tarun
{
static void Main(string[]
args)
{
DbConnection con =
ashish.CreateConnection("System.Data.SqlClient",
"initial catalog=wcf;data source=AMIT-PC\\MIND;Integrated
Security=False;uid=sa;pwd=Mind1234");
con.Open();
DbCommand cmd = con.CreateCommand();
cmd.CommandText =
"select * from EMPLOYEE";
DbDataReader rd = cmd.ExecuteReader();
Console.WriteLine("Abstract
Factory Pattern....");
while (rd.Read())
{
Console.WriteLine(rd["EMP_ID"]
+ " " + rd["EMP_NAME"]);
}
Console.ReadKey(true);
}
}
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