Hi , I read your post and I think is pretty interesting as you say you can send sample code.
May you send me at this adresse some code sample ? Chears. <-- Alexandre Jaquet -> -----BEGIN GEEK CODE BLOCK----- Version: 3.12 GCM d+ s: a-- C++++ U*+ P L--- E--- W+++ N+++ o K---- w+++++ O---- M-- V-- PS+++ PE+++ Y+++ PGP--- 5-- X++++ R* tv b++++ DI--- D---- G++ e* h++ r% y* ------END GEEK CODE BLOCK------ ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, January 29, 2003 9:48 AM Subject: RE: Design Patterns/Examples Hi, We have used folowing approach.. To access db , we use DAO pattern(refer to Sun's blue prints for more details).The DAOs return value objects And all calls to the DAO must go through service layer.. So in action classes u get Instance of appropriate service from service factory and call the corresponding method..So all the data base access logic and conversion of result set to u r value beans is in service layer.(We have used converter classer for the same..One converter per Value bean...) Also as service factory is used, u can pretty much change ur servie implementation with out afecting the struts layer. So on struts side ,the action clsses are pretty much simple .They just delegate the request. In action, we get the data from request.And validate the data and if any validation errors, send back to the user.Each form contains value beans as thier attributes.So the data from jsps is automatically populated in the form beans and the action just has to cast the form bean to appropiate type and call getBean or beanList as the case may be.. And as u said, the most important part is how we handle conversion of data from primitives to string and vice versa.On form bean, all beans are StringBeans...So for each ValueBean we have a corresdpondign String bean..And the StringBEan has a method getBean which returns the corresponding valueBean after performing the conversions from String to primitive type.Similarly on each ValueBEan we have a getStringBEan which performs the conversion from primitive to String type.And we have a Utility class ParsingUtils which has all the conversion methods... The most important part is we use CodeGeneration using XSLT to create the value BEans,DAOs,COnverters for value beans and the String beans.And for the code generation , we use an XML which describes which StroedProc is caled and the field names etc etc.So all this conversion methods (getStringBean and getBean)are also auto generated.And as we have utility methoda in PArsingUtils,this is nto at all difficult.So we dont spend any time at all coding data conversion or data access layer.All we need to do is write jsps and action classes to delegate... Hope this is not too lengthy or confusing...I know there are some issues like too many Objects are created(for each bean, a correspondign string bean is created etc etc..)but we have found a satisfactory performance for our load tests... If any body s interrested, i can give sample code for code generation as well.. hope this helps, regards, Shirish -----Original Message----- From: pat.quinn2009 [mailto:[EMAIL PROTECTED]] Sent: Tuesday, January 28, 2003 9:21 PM To: struts-user Subject: Design Patterns/Examples Hi Guys, Any one know of some design patterns or examples i could use with struts. I want to access a database(Value Objects) allow the user to change the VO data, perform some business validation and update the database. I'd like some pointers also when working with form beans and vo object whats the best way to transfer data between them... should i use vo's as instance variable instead form bean... if so how will i handle java primitives like double's etc.. I'm not looking for the answers to all the above but i'd like to review a pattern or example which demonstrates the best approach for the above. I have my own ideas but would like to look over some design patterns/examples before commencing this work. Cheers, Guys _________________________________________________________________ Add photos to your messages with MSN 8. Get 2 months FREE*. http://join.msn.com/?page=features/featuredemail -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
