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When you initiate a connection by using either the SQL*Plus interface or some other means, you need to provide your username and password for the database you are connecting to Once you do so, Oracle Net has to figure out which server the database is running on, so it consults the tnsnamesora file to resolve the network address, the protocol, and the port for the database server When it successfully resolves these, it initiates contact with the listener on the machine where the database server is located Once the listener hands off the connection to the database server, the database authenticates your username and password Once you configure connections using the local naming method, all database connections, whether they are made directly through SQL*Plus or through an application s logon page, will use the tnsnamesora file to resolve service names In addition to the tnsnames.

Public Class CoordinatorOrderEntry Public Function GetColors(ByVal theModel As String, _ ByVal theStyle As String) As Color() Return FireGetColors(theModel, theStyle) End Function ' each entry in the returned ArrayList is a PriceItem[] Public Function GetOptions(ByVal theModel As String, _ ByVal theStyle As String) As ArrayList Return FireGetOptions(theModel, theStyle) End Function Public Function GetStyles(ByVal theModel As String) As String() Return FireGetStyles(theModel) End Function Public Sub SubmitOrder(ByVal theModel As String, ByVal theStyle As String, _ ByVal theColor As Color, ByVal theOptions _ As PricedItem() ) FireSubmit(theModel, theStyle, theColor, theOptions) End Sub Public Function ComputeCostOfOptions(ByVal theOptions As PricedItem() ) _ As Decimal Dim totalPrice As Decimal = 0 For Each opt As PricedItem In theOptions totalPrice += opt.Cost Next Return totalPrice End Function Public Delegate Function GetStylesHandler(ByVal theModel As String) As String() Public OnGetStyles As GetStylesHandler Function FireGetStyles(ByVal theModel As String) As String() If OnGetStyles Is Nothing Then Return Nothing Return OnGetStyles(theModel) End Function Public Delegate Function GetColorsHandler(ByVal theModel As String, _ ByVal theStyle As String) As Color() Public OnGetColors As GetColorsHandler Function FireGetColors(ByVal theModel As String, _ ByVal theStyle As String) As Color() If OnGetColors Is Nothing Then Return Nothing Return OnGetColors(theModel, theStyle) End Function

ora file, client machines make use of another file called sqlnetora when they use the local naming method The sqlnetora file is located on each client and contains import network configuration parameters (Of course, if a server is used as a client as well, there will be a sqlnetora file on the server) 11 shows how to use the SQLNETAUTHENTICATION_SERVICES parameter to configure operating system authentication Here s a typical sqlnetora file: # SQLNETORA Network Configuration File: /u01/app/oracle/product/1010/db_1/network/admin/sqlnetora # Generated by Oracle configuration tools NAMESDEFAULT_DOMAIN = wowcompanycom SQLNETAUTHENTICATION_SERVICES= (NTS) NAMESDIRECTORY_PATH= (TNSNAMES) The tnsnamesora and sqlnetora configuration files are usually located in the $ORACLE_HOME/ network/admin directory on UNIX/Linux systems and in the $ORACLE_HOME\network\admin directory on Windows systems However, you can place these files anywhere you like.

If you place them in a nondefault location, you have to use the TNS_ADMIN environment variable to tell Oracle where the files are Oracle will search for the two files in the following locations, and it will use the first of each it finds: 1 Oracle looks in the directory specified by the TNS_ADMIN environment variable 2 For the tnsnamesora file, Oracle will look in the global configuration directory For a UNIX/ Linux system, this is usually the /var/opt/oracle directory 3 Oracle will look in the standard network directories: $ORACLE_HOME/network/admin on UNIX/ Linux systems and $ORACLE_HOME\network\admin on Windows systems..

To configure local naming, you have to edit the tnsnames.ora file provided by Oracle when you create a database. All you need to do is go to the default tnsnames.ora location, $ORACLE_HOME/ network/admin, and edit this file to reflect your network and database service name information. When you add a new database to your system, you also need to physically add the new database service name mapping to each user s tnsnames.ora file or send all your users a new, updated tnsnames.ora file to replace the old one. Listing 11-6 shows a typical tnsnames.ora file. Listing 11-6. A Typical tnsnames.ora File # TNSNAMES.ORA Network Configuration File: /u01/app/oracle/product/10.1.0/db_1/network/admin/tnsnames.ora # Generated by Oracle configuration tools. finance = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)) ) (CONNECT_DATA =

' each entry in the returned ArrayList is a PriceItem Public Delegate Function GetOptionsHandler(ByVal theModel As String, _ ByVal theStyle As String) _ As ArrayList Public OnGetOptions As GetOptionsHandler Function FireGetOptions(ByVal theModel As String, ByVal theStyle As String) _ As ArrayList If OnGetOptions Is Nothing Then Return Nothing Return OnGetOptions(theModel, theStyle) End Function Public Event OnSubmit(ByVal theModel As String, ByVal theStyle As String, _ ByVal theColor As Color, _ ByVal theOptions As PricedItem() ) Sub FireSubmit(ByVal theModel As String, ByVal theStyle As String, _ ByVal theColor As Color, ByVal theOptions As PricedItem() ) RaiseEvent OnSubmit(theModel, theStyle, theColor, theOptions) End Sub End Class ' class Router