RE: Multi Indexed & Nested properties samples?

[Peter Pilgrim]

Data Access Object is something that you write for own application.
It is an object that abstract database read and writes from the web application code.
So theory is that DAO for Sybase could be swapped with one for Oracle.

See "http://java.sun.com/blueprints/";
http://java.sun.com/blueprints/enterprise/index.html look under DAO

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Peter Pilgrim                       ++44 (0)207-545-9923

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From:  "Annie Chang" <[EMAIL PROTECTED]> on 25/03/2002 13:59 PST

Please respond to "Struts Users Mailing List" <[EMAIL PROTECTED]>

To:    "Struts Users Mailing List" <[EMAIL PROTECTED]>
cc:
Subject:    RE: Multi Indexed & Nested properties samples?


Thank you very much Peter. I have solved the issue. Your suggestion is
another choice.

I'm trying to find a approach to access database. I'm interested in DAO
you mentioned.
What's DAO and can you give me a example? Thanks in advance.

Annie



      -----Original Message-----
      From: Peter Pilgrim
      Sent: Mon 3/25/2002 6:41 AM
      To: Struts Users Mailing List
      Cc:
      Subject: Re: Multi Indexed & Nested properties samples?





      Annie

      MUTATOR You will need the mutator method obviously `public void
setName( String )'

      PREFERS INTERFACES Instead of using java.util.Vector, prefer to
using an Java
      Collection interface java.util.List.

      public List getSubscriptionList()
      {
         List list = new ArrayList();
         // fill her up
         return list;
      }

      Pros; you change the type of ``List'' in the future. Suppose a
better list appears tomorrow
      Cons: no problem


      DELEGATE if you have a business object or DAO consider
delegation to access.
      Instead copying the accessor / mutators of the DAO to the
ActionForm.
      Let the DAO be a delegate because Struts supports ``nested bean
properties''
      out of the box,


      public class CreditDetailDAO  { ....
           public String getAuthority() { .. .}
      }

      public class Employee extends ActionForm {

      // Delegate it!
      private CreditDetail cred;
      public CreditDetailDAO  getCreditDetail() { return cred; }
      public void setCreditDetail( CreditDetailDAO c ){ this.cred = c
};
      }

      Then JSP can be written like so <bean:write name="obj"
property="creditDetail.authority" />

      --
      Peter Pilgrim                       ++44 (0)207-545-9923

      ............................................ Swamped under
electronic mails


      ---------------------------------------- Message History
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      From:  "Annie Chang" <[EMAIL PROTECTED]> on 24/03/2002
16:39 PST

      Please respond to "Struts Users Mailing List"
<[EMAIL PROTECTED]>

      To:    "Struts Users Mailing List"
<[EMAIL PROTECTED]>
      cc:    <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
      Subject:    Re: Multi Indexed & Nested properties samples?


      Arron,

      I want to let the user modify all informations in one page like
this way:


*--------------------------------------------------------------------
      |  User Information:
      |         Name:________     Telephone:_____________________
      |         Email:_________    Address:______________________
      |
      |  Subscriptions:
      |         Host          User Name   Password    Type
Autoconnect
      |         _______   ________   ________   ____  __________
      |         _______   ________   ________   ____  __________
      |         _______   ________   ________   ____  __________
      |         _______   ________   ________   ____  __________
      |
      |  Interested Webs:
      |         Catalog      Name        URL
      |         _______   _______    __________________________
      |         _______   _______    __________________________
      |         _______   _______    __________________________
      |         _______   _______    __________________________
      |
      |
      |    Save

*----------------------------------------------------------------------


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