J2EE pattern for complex database searches

I am havin trouble finding a method for doing complex searches that I am happy with.
I have a table of "log entrys" - each "log entry" is composed of an "admin user", "action" and one or two "target" value objects, as well as a Timestamp.
The problem here is a user, through a JSP form, will want to run searches such as "Get me all logs for user X between time Y and time Z involoing action A".
What is the best way of encapsulating this between the Web Tier and the EJB tier (obviously, once it's in the EJB Tier, it's time to translate it into SQL in the DAO and send the query off to the database).
Is it as simple as having a "Search Criteria" class containing many constants (e.g. SEARCH_BY_USER_ID, SEARCH_BY_MIN_TIME) and each instance of search criteria holding a map (e.g. "SEARCH_BY_USER_ID" => "BDTURNE", "SEARCH_BY_MIN_TIME" => "21st August") - or is there a better / neater way of encapsulating this call ?
All ideas / suggesitons welcomed !
Cheers,
Ben Turner

I think it is good Idea to have some constants like USERID, MINTIME, etc and can dynamically formulate the Query depending on the Data you are getting.

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http://www.tom-muck.com/extensions/help/dynamicsearchasp/
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Cheers jojo
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Welcome to this forum on "Core J2EE Patterns" by the Sun Java Center

Welcome to this forum on Core J2EE Patterns by the Sun Java Center!
CONTEXT:
This forum is intended for discussing the patterns from the Sun Java Center J2EE Pattern Catalog and other topics discussed in our book, Core J2EE Patterns.
We, the authors of the book, welcome you to this forum.
WHO WE ARE:
We are Enterprise Java Architects from the Sun Java Center (SJC), which is the Java consulting organization of Sun Microsystems. We are a world-wide group of architects focusing on all consulting related to Java technologies.
Visit our web-site for more information on SJC:
http://www.sun.com/service/sunps/jdc/index.html
BACKGROUND:
Over the last few years, we at SJC have worked with our customers in architecting, designing, and implementing solutions on the J2EE platform. We have worked on documenting the J2EE patterns for over two years and released the patterns for public review in Beta form via the Java Developer Connection in May, 2001.
The beta version of the patterns is available online as The Sun Java Center J2EE Pattern Catalog at:
http://developer.java.sun.com/developer/technicalArticles/J2EE/patterns/
Subsequent to the release, we received great feedback and comments from hundreds of reviewers. We then worked towards incorporating the feedback into the pattern documentation. One of the common comments was about the lack of code examples in the online documentation. The latest pattern documentation provides many code examples and incorporates all the feedback received so far.
BOOK INFORMATION:
Core J2EE Patterns, the book, was released at JavaOne 2001 during June 4-9, and will be available in stores around the end of June 2001.
The book includes the complete updated Sun Java Center J2EE Pattern Catalog with 15 patterns covering these J2EE technologies: Java Server Pages (JSP), Servlets, Enterprise JavaBeans (EJB), and Java Message Service (JMS). In addition to the J2EE Pattern Catalog, the book also provides other chapters that discuss design considerations,
bad practices, and J2EE Refactorings. Example code is included for all patterns and strategies.
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The online community for discussing the patterns included in our book Core J2EE Patterns has grown over the past year, since our first presentation at JavaOne 2000. This community is supported by our LISTSERV and is available for public participation at:
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You can view the past discussions on this list at the above URL.
FORUM LOGISTICS:
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All responses to questions posed in this News Group are given on an "as is" basis. We believe the solutions or explanations given here are correct, but do not guarantee that responses will be complete, without error and/or work for all platforms and system configurations.
The forum is now open! Let the discussion begin...
John Crupi - Chief Java Architect
Dan Malks - Enterprise Java Architect
Deepak Alur - Enterprise Java Architect
---Authors of Core J2EE Patterns

Rajakannan,
There are numerous ways to implement a templating mechanism in support of the composite view pattern, included in the catalog as a presentation-tier pattern.
The goal is to avoid simply having monolithic views with all the formatting code embedded directly withing the view. If we have common subviews that are shared across several or more views then we end up with a copy-and-paste type of reuse...undesirable. So, modularity is one issue. Another major force when considering the Composite View pattern is that we may want to manage the layout of our pages and the content of our pages separately. We may have some logical regions defined, such as a search panel and main body, and a subview that plugs into those logical regions that map to a physical page (ie: x.jsp and y.jsp). We may then want to vary one independent of the other...ie: we may want to modify the layout of the page w/o changing the content and we may want to vary the content w/o touching the layout.
There are a number of implementation strategies that can be used to implement the Composite View pattern, ranging from relatively simple to much more sophisticated. We describe each in our book and include source code examples.
The example in the book that allows for supporting all the issues described above is implemented using the "Custom Tag View Management Strategy" and uses a tag library written by David Geary, that supports the Composite View pattern. The library is also included in David's new book, Adv. JavaServer Pages, Prentice Hall, 2001.
Again, it's simply one implementation and, as you mention, there are many different ways to implement this strategy.
Thanks for your question,
Dan

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Question of using Struts for the J2EE pattern

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I'll take a stab at number 2 and number 3.......
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I'm not really a java programmer, I just play one on TV.

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New J2EE Pattern

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In 2008 the university manager to assess the student progress situation wants them to develop an enterprise project. Because most of students haven’t enough experiences in implementing software project, we did primary analysis and during implementing project we try to don't help them. Unfortunately output of the project was re-programming the project. This problem kept our mind busy for a long time until we try to create a standard and comprehensive pattern for completing a project. After doing this job we do many enterprise projects with this pattern and the result was 50% saving time of developing and extending the project. So we decided to offer this pattern for developers in SourgeForge website.
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thanks for share.i like it . http://www.usedconecrusher.com
Edited by: 783365 on 2010-7-20 下午6:23

Server Sizing For Oracle Database

Hi All,
I need a server sizing for the below mentioned architecture:
This application is basically for logistics company which we are planing to host it centrally with two server's one server for application and one for oracle database along with DR site (Other Location). There are four locations and each location will have 20 users who are going to access this application (20 x 4= 80 Users). We are using MPLS network of 35 mbps bandwidth.
1. Application server: Windows server 2008 R2
2. Database Server: Windows server 2008 R2, Oracle 11g r2
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EdStevens wrote:
Justin Mungal wrote:
EdStevens wrote:
user1970505 wrote:
Hi All,
I need a server sizing for the below mentioned architecture:
This application is basically for logistics company which we are planing to host it centrally with two server's one server for application and one for oracle database along with DR site (Other Location). There are four locations and each location will have 20 users who are going to access this application (20 x 4= 80 Users). We are using MPLS network of 35 mbps bandwidth.
1. Application server: Windows server 2008 R2
2. Database Server: Windows server 2008 R2, Oracle 11g r2
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Thanks........I'd seriously reconsider hosting Oracle db on Windows. Obviously there are many, many shops that do. And obviously it is often a case of the fact that they do not have (and choose to not acquire) expertise in Linux. But I've been in IT for 30+ years and have worked on IBM S-370 and its variants and descendents, Windows since v3, DEC VMS, IBM OS/2, Solaris, AIX, HPUX, and Oracle Linux. The first Oracle database I ever created was on Windows 3.11 and at that point I had never seen *nix. Now I am in a position to state that Windows is the worst excuse of an operating system of any I have ever used. I am constantly amazed/amused by how often (at least once a month on schedule, plus unplanned times) that our Windows SA has to send out a notice that he is re-booting his servers. I can't remember the last time we had to reboot a Linux server ( I have 4 of them)
Yes, I'm biased away from Windows, but that bias comes from experience. Hardly a day goes by that I don't see something that causes me to say to whoever is in earshot "have I told you how much I hate Windows?"I was going to refrain from commenting on that, as I assumed they're a Windows shop and aren't open to any other OS (but my assumption could be incorrect).
I haven't been working in IT for as long as many of the folks around here, only about 10 years. I'm a former system admin that maintained both Linux and Windows servers, but my focus was on Windows. In the right hands, Windows can be rock solid. If a system admin has to reboot Windows servers often, he is most likely doing something wrong, or is rebooting for security updates. It's never as simple as "Windows Sucks," or "Linux Sucks;" it all depends on who's running the system (again, in my opinion).
I have seen some windows servers run uninterrupted for so long no one could remember the admin password. But more often memory leaks and the "weekly update" (replacing last weeks bugs with this weeks) is the culprit.
Yes, it really is sad how often you have to reboot for updates if you want to keep your system current. Mind you, it's better to have the fixes then to not have them (maybe). I rebooted my servers about once every month at my old place... which is not that bad.
With that said, in my experience, Oracle on Windows is a major pain. It takes me much longer to do anything. Once you get proficient with a CLI like the bash shell, the Windows GUI can't compare.Agreed. One of my many complaints about Windows is the poor excuse of a shell processor. I'm pretty proficient in command line scripting, but still cringe when I have to do it. Practically every line of code I write for a command script is accompanied by the remark "this is so lame compared to what I could do with a shell script". Same for vi vs. notepad. But my real problem is the memory leaks and the registry. I'm fairly comfortable hacking certain areas of the registry, but the need to and the arcane linkages between different areas of the registry and how they influence 'process environment' remains a mystery to all but a tiny minority of admins. Compare to *nix where everything is well documented and "knowable".
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Question about what the content should be for a database standards document

Hi Experts,
I am working as development DBA in a J2EE project and have a task to create a database standards document. The document should be used as a reference by the developers when they submit requests for database changes - like adding or making changes to the database schemas (adding tables/modifying them etc.). I thought of what would be the right content for this type of standards document and I think that such a document should have the following as database standards:
1) Naming standards for the database objects.
This will include all database objects like tables, columns, primary keys, foreign keys, views, triggers, procedures etc.. For example a standard can be defined like: all primary keys should be named as PK_TABLENAME. All indexes should be named as <TABLE_NAME>_IDX01 etc.
2) Use of Oracle reserved words should be avoided in the schema object names.
3) The names should be descriptive so as to make their purpose self evident.
4) Wherever possible, tables should have primary keys.
5) Wherever possible columns should be defined NOT NULL -as it helps performance (Indexes on NULLABLE columns are not used by the optimizer).
6) When submitting request for a new table/tables, typical queries against these new tables should also be worked out and based on that indexes that will be needed for the new tables should be defined. In case this is not clear at the time of initial table creation, it should be clarified within 3 weeks (just a reasonable period to be mentioned here).
Is this fair enough content forthe standards document or does it miss some important aspects? Note that we do not have to cover in this document standards for database creation or RAC installation etc. It is a document of standards to be followed by developers as a reference when submitting database changes. I will be thankful for your review.
(Oracle version info: We are on Oracle 11.2.0.2 on Solaris 10.)
Thanks,
OraserN

rp0428 wrote:
>
5) Wherever possible columns should be defined NOT NULL -as it helps performance (Indexes on NULLABLE columns are not used by the optimizer).
>
That isn't true - post a link that supports that statement.
Heap indexes do not INDEX null values but indexes on NULLABLE columns are most certainly used by the optimizer for use cases where your query is looking for non-null values.
Columns should be defined NOT NULL when your business requirement is that the column should ALWAYS have a value. You can, of course, adopt some standard default value (e.g. 'U' for unknown) and make an otherwise NULLABLE column NOT NULL so that each row WILL be indexed. That may only be useful if you want to be able to search for rows that have that value and those rows are in the minority.Then I must be wrong....I will modify the standard as:
5) Whenever the business requirement is such that the column will allways end up having a value , then all such columns should be defined as NOT NULL. Also if a column can be defined to have a default value then this default value should also be specified.
Hope this is more proper then earlier and thanks a lot for the review!!
Edited by: orausern on May 13, 2013 9:53 AM

Oracle for genetic databases: implementations, overviews?

I'm interested in obtaining information on Oracle
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identifiers), optics (wavelengths, intensities, etc.) &
increases in cell growth. I'm going to be interested in Oracle
datamining &/or datawarehousing in order to get information out
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Kevin,
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- Table Functions to allow piplined "C" procedures for performance improvements of compute intensive operations.
Many useful features are already in 8i (see below) but have been updated or now can be integrated with new 9i features:
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- External tables for ability to make an external table appear equivalent to a native Oracle table so you can query and perform operations on.
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- Oracle InterMedia for storage of image, video etc. data types and ability to perform basic queries and operations on them.
- Oracle Workflow for automating processes within the database. E.g Upload data from GenBank, Mine data to find "targets" and distribute reports to appropriate scientists.
- Oracle Portal to facilitate collaboration and set up company "My.company.com" standard portals with personalized information, reports, etc.
- Oracle Thesaurus so you can define multiple synonyms for a word, gene or pathogen etc.
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cb
Dear Charles Berger,
How can I see the Internal LInks that you posted?
They look useful as I am a student in bioinformatics currently taking an intro course to database systems and will be implementing a db in Oracle8i.
Also, would you suggest I try to work with 9i and skip 8i. THe problem I have is that all the books and documentation I have is for 8i. Is 8i already history?
Kevin
[email protected]

J2EE pattern for complex database searches

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