/// <summary>
/// Gets the instance.
/// When class is first accessed, GetInsatnce() creates relevant object instance and returns object identity to programmer.
/// On subsequent calls of getInstance(), no new instance is created, but identity of existing object is returned.
/// </summary>
/// <returns>return instance of DBProviderSingleton class</returns>
public static DBProviderSingleton Instance(string connectionStringName)
{
try
{
if (objDBProviderSingleton == null)
{
objDBProviderSingleton = new DBProviderSingleton(connectionStringName);
}
return(objDBProviderSingleton);
}
catch (Exception objEx)
{
throw new Exception("Error while creating instance of DBProviderSingleton.", objEx);
}
}
private void Initialiger(string ConnectionStringName = "ConnectionString")
{
try
{
////Executeting an instance of DBProviderSingleton Class
DBProviderSingleton objDBProviderSingleton = DBProviderSingleton.Instance(ConnectionStringName);
string strProviderName = objDBProviderSingleton.ProviderName.Trim(); ////Assining ProviderName
if (!string.IsNullOrEmpty(strProviderName))
{
switch (strProviderName.Trim())
{
case "System.Data.SqlClient":
this.objDBProviderFactory = DbProviderFactories.GetFactory("System.Data.SqlClient"); ////Creating an instance of SQL
break;
case "System.Data.OleDb":
this.objDBProviderFactory = DbProviderFactories.GetFactory("System.Data.OleDb"); ////Creating an instance of OleDb
break;
case "System.Data.Odbc":
this.objDBProviderFactory = DbProviderFactories.GetFactory("System.Data.Odbc"); ////Creating an instance of Odbc
break;
case "System.Data.OracleClient":
this.objDBProviderFactory = DbProviderFactories.GetFactory("System.Data.OracleClient"); ////Creating an instance of Oracle
break;
default:
this.objDBProviderFactory = DbProviderFactories.GetFactory("System.Data.SqlClient"); ////Creating an instance of SQL
break;
}
}
this.objDBConnection = this.objDBProviderFactory.CreateConnection(); ////It returns connection from DbProviderFactory.
this.objDBCommand = this.objDBProviderFactory.CreateCommand(); ////Creating an instance from DbProviderFactory.
this.objDBConnection.ConnectionString = objDBProviderSingleton.ConnectionString.Trim(); ////Assining Connection String
this.objDBCommand.Connection = this.objDBConnection;
}
catch (Exception objEx)
{
throw new Exception("Error on initializing connection.", objEx);
}
}
/// <summary>
/// Gets the instance.
/// When class is first accessed, GetInsatnce() creates relevant object instance and returns object identity to programmer.
/// On subsequent calls of getInstance(), no new instance is created, but identity of existing object is returned.
/// </summary>
/// <returns>return instance of DBProviderSingleton class</returns>
public static DBProviderSingleton Instance(string connectionStringName)
{
try
{
if (objDBProviderSingleton == null)
{
objDBProviderSingleton = new DBProviderSingleton(connectionStringName);
}
return objDBProviderSingleton;
}
catch (Exception objEx)
{
throw new Exception("Error while creating instance of DBProviderSingleton.", objEx);
}
}