The OSIV is read only by default, but also works in tandem with Spring's transaction managers and could change its flush mode. See http://static.springframework.org/spring/docs/2.5.x/api/org/springframework/orm/hibernate3/support/OpenSessionInViewFilter.html
2008/9/28 Jack_Ryde <[EMAIL PROTECTED]>: > > Thanks for your reply, Gabriel. > > First of all, in both A and B, we use the same action class variable (POJO) > to represent the entity bean. > The only difference is the initialize method. A uses a normal class method > while B uses the prepare method. > > Secondly, how does "OpenSessionInViewFilter" commits the session and perform > the update? I thought it is read-only? But I agree with your idea and and I > can see that from the logs "the session is closed with the hibernate > update". I just do not know why and how this happens. > > > cheers > Jack > > > > > > Gabriel Belingueres-2 wrote: >> >> I suspect that in case A) you are just creating a new POJO in memory >> (never linked to the Hibernate's Session), that's why the >> OpenSessionInViewFilter does nothing. >> >> In case B), you are loading into the Session the POJO in the prepare >> method. When submit the form, it is loaded again before action's >> execute() method, then the ParametersInterceptor updates the POJO >> field, and at the end the OpenSessionInViewFilter commits the Session >> with the POJO's fields modified, so Hibernate performs the update. >> >> 2008/9/24 Jack_Ryde <[EMAIL PROTECTED]>: >>> >>> Keyword: struts2 preparable, spring OpenSessionInViewFilter, hibernate >>> transaction management. >>> >>> Background: >>> >>> We use OpenSessionInViewFilter in our web xml to enable lazy loading in >>> web >>> views. >>> >>> The struts action class provides a basic function in adding, updating and >>> deleting data entity as a controller. >>> >>> Our form fields reference the entity object and its properties with a >>> valid >>> OGNL expression... >>> like <s:textfield name="organisation.phoneNumber"></s:textfield> >>> >>> The submitform's action does nothing to D.B. >>> >>> Problem: >>> >>> Case A: >>> >>> The struts action does not implement Preparable interface and we use some >>> private method to initialize the data used . >>> >>> The jsp uses the entity expression directly. <s:textfield >>> name="organisation.phoneNumber"></s:textfield> >>> >>> As a result, whenever you make any change in the jsp for this entity and >>> submit the form, it does not go to the D.B. >>> >>> Which is good because this is exactly what we want as "Open Session in >>> View", which is read-only. >>> >>> >>> >>> Case B: >>> >>> The struts action does implement Preparable interface and in the >>> implementation, we retrieve the data from database and populate its >>> original >>> value. >>> >>> And the jsp uses the entity expression directly. <s:textfield >>> name="organisation.phoneNumber"></s:textfield> >>> >>> As a result, whenever you make any change in the jsp for this entity and >>> submit the form, it changes the D.B. >>> >>> My question is the case B: >>> >>> How does "Preparable" influence hibernate transaction management? Anyone >>> has any idea? >>> >>> >>> I guess it is related to the struts 2 Interceptor, which does have some >>> influence to the spring, which then influences the hibernate transaction >>> control. >>> >>> I post the problem in struts forum, not spring or hibernate forum, >>> because >>> if I do not use "Preparable", everything works as expected. >>> >>> >>> cheers >>> Jack >>> >>> >>> >>> -- >>> View this message in context: >>> http://www.nabble.com/%22Preparable%22-influence-hibernate-transaction-management-when-using-%22OpenSessionInViewFilter%22-tp19660675p19660675.html >>> Sent from the Struts - User mailing list archive at Nabble.com. >>> >>> >>> --------------------------------------------------------------------- >>> 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] >> >> >> > > -- > View this message in context: > http://www.nabble.com/%22Preparable%22-influence-hibernate-transaction-management-when-using-%22OpenSessionInViewFilter%22-tp19660675p19716707.html > Sent from the Struts - User mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > 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]
