Any example of scenarios other than doing search for which I could use "compass"?
Lets say we have a page that list top 10 most view article. How to use compass to show this kind of results. Any demo/sample project on this to refer to? definitely Jira would be a good example but its source code is not available. I want to know how to maximize the benefits of using compass-lucene in an application.
May i know where can i download spring-compass jpa #annotated example? The nightly built i downloaded is xml-based.
Any example of scenarios other than doing search for which I could use "compass"?
Well, AFAIK, this is what is has been designed for.
Lets say we have a page that list top 10 most view article. How to use compass to show this kind of results.
I'm not sure this is a good use-case, Compass is in my opinion useful when you want to search results across the whole application business domain model i.e. not only lets say articles (in that case, you can just query the database).
Now, let's imagine that your domains objects are searchable classes and have a searchable property numberOfViews, I guess it would be possible to search on this property (refer to the whole Searching section).
Any demo/sample project on this to refer to?
The compass distribution includes samples: a Library basic example that highlights the main features of Compass::Core and a Petclinic sample that shows how to add compass to an existing application (the Spring petclinic sample).
I want to know how to maximize the benefits of using compass-lucene in an application.
Read the author's blog, Compass wiki and the reference documentation :)
May i know where I can download spring-compass jpa #annotated example?
As mentioned, the spring-compass sample included in compass distribution is based on Spring's petclinic which doesn't use annotations (see SPR-2960). Just in case, petclinic annotated entities are attached to SPR-2960 so feel free to use them.
Related
I am quite new to StormCrawler - as I have been exploring the documentation, as well as the READMEs and additional resources, I have noticed that it is often referred to a "URL database" which should handle storing information concerning the the URLs from the run of the crawler (for example here).
I have, however, not found anywhere of what type this database is, nor how to customize it or replace it with custom modules. I have been following the code and got to IOOutputController, which has some quite confusing methods and with the lack of docstrings, it is quite challenging to actually even determine the class responsible for handling this.
I would be very grateful for any guidance!
Thank you for your time, Matyáš
The most commonly used storage for the URLs in StormCrawler is Elasticsearch. This is illustrated in the tutorials. There are other ones available such as SQL or SOLR, see enter link description here; StormCrawler is not limited to a specific database.
In most cases, people just use an existing backend implementation such as the Elasticsearch one.
I am trying to build a basic CRUD application with NetBeans 7.4, JSF, PrimeFaces and JPA using MySQL.
I have successfully done this by using the NetBeans wizards. I want to do this from scratch, no wizards.
There seems to be a lack of support for the combo of JSF, PrimeFaces and JPA. When I say "lack", I mean a full example (I might be asking too much), without using the CRUD auto-gen templates/classes AND shows actual queries coded and passed to the datatables(primefaces). YouTube is full of non-English speaking examples using Hibernate (not JPA) and other examples that show flashy GUI's with no code.
So far I understand you need an #Entity class (provides the physical build of the tables), a Controller (serializable) and the .xhtml web page to show the datatable.. what else? Also, I'm not seeing any posts or examples where queries are using with JPA/JSF and how they are tied together (in one place). I need to connect the dots here so that I can leverage JSF/JPA to create simple queries to populate my PF DataTables. I've read the blogs and I've googled the intranets until I'm blue in the face. Sending me a list of URL's to read to learn about each product is something I've already done. I get what they do independently, but am looking for the "How do they all connect" answer with maybe some basic code examples!! :)
Since version 11, PrimeFaces comes with a JpaLazyDataModel which you can use with your p:dataTable. In its simplest form to be used like:
new JpaLazyDataModel<>(MyEntity.class, () -> entityManager);
See also:
DataTable documentation on JpaLazyDataModel
Source code
I think this should help you:
http://www.tutorialspoint.com/jsf/jsf_tutorial.pdf
Tung
look.If you need an example about CRUD operation using JPA/EJB as Model layer and JSF as view layer,you can see the follwing example:
http://uaihebert.com/?p=834
also my own blog is based on many examples explaining this.These examples are using JPA2/EJB3 as model and JSF2 and primfaces as view you can see
http://jsfspotlight.blogspot.com/2013/05/jsf2ejb3-preparing-your-environment.html (this post for explaining how to prepare your environment before developing EJB/JSF Applications
http://jsfspotlight.blogspot.com/2013/05/ejbjsf-master-detail-web-application-in_25.html
(in this post i explain in details how to create EJB/JSF master_detail Application including what you need about connecting model and view layers)
explore the blog for more examples
Try this archetype which will create you an example and then check how it is implemented: https://github.com/ignl/happyfacescrud. You will learn about Spring, Spring security, Spring WS, JPA and Hibernate, Spring data and QueryDsl for easier querying, and custom JSF components which will make you very productive jsf developer.
My application is related to health care, so I would like to have queries that use "heart" to also bring results that include "cardiac"
That is just an example, I have many more synonyms I need to load.
How does SOLR can be taught about those synonyms?
See the SOLR documentation, you'll want to create a SynonymFilter on a Field in your schema, and then define a synonyms.txt file to define all your synonyms, formatting of the file is detailed best in the docs so I won't go into it here.
http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters
I have been handed a large Spring - Hibernate project and have been told to go through the code and figure out how it works.
I have been able to run the project in JBoss and access pages locally, but I have no idea how to figure out how the program is layed out, as I have no web programming experience.
I have been told that it is "pretty simple" and is a "normal Spring-Hibernate project."
Any idea where to begin?
Well, for starters, you'll really need to learn at least the basics of how these frameworks operate. Here's a tutorial on Spring MVC, and here's a Hibernate tutorial.
You'll need to identify the classes that create the various layers; there are certainly going to be Controller classes (which take a web request and figure out how to construct the response) and DAO classes (Data Access Objects, which manage saving and retrieving data).
There will probably be JSP files which describe the views; that is, what the user sees. The HTML code that builds the actual web pages should be here.
My suggestion: pick one simple page and follow it through. Where's the JSP that sets up the HTML for that page? Where's the controller it gets POSTed to? Does that controller call a service class or a DAO? A validator? Etc. -- type in one bit of data and follow it all the way through. It will help to have an IDE that shows you the structure of the application, and allows you to go into debug mode and step through the code.
Good luck!
I'm hoping to find out what tools folks use to synchronize data between databases. I'm looking for a JDBC solution that can be used as a command-line tool.
There used to be a tool called Sync4J that used the SyncML framework but this seems to have fallen by the wayside.
I have heard that the Data Replication Service provided by Db4O is really good. It allows you to use Hibernate to back onto a RDBMS - I don't think it supports JDBC tho (http://www.db4o.com/about/productinformation/drs/Default.aspx?AspxAutoDetectCookieSupport=1)
There is an open source project called Daffodil, but I haven't investigated it at all. (https://daffodilreplicator.dev.java.net/)
The one I am currently considering using is called SymmetricDS (http://symmetricds.sourceforge.net/)
There are others, they each do it slightly differently. Some use triggers, some poll, some use intercepting JDBC drivers. You need to decide what technical limitations you are under to determine which one you really want to use.
Wikipedia provides a nice overview of different techniques (http://en.wikipedia.org/wiki/Multi-master_replication) and also provides a link to another alternative DBReplicator (http://dbreplicator.org/).
If you have a model and DAO layer that exists already for your codebase, you can just create your own sync framework, it isn't hard.
Copy data is as simple as:
read an object from database A
remove database metadata (uuid, etc)
insert into database B
Syncing has some level of knowledge about what has been synced already. You can either do it at runtime by getting a list of uuids from TableInA and TableInB and working out which entries are new, or you can have a table of items that need to be synced (populate with a trigger upon insert/update in TableInA), and run from that. Your tool can be a TimerTask so databases are kept synced at the time granularity that you desire.
However there is probably some tool out there that does it all without any of this implementation faff, and each implementation would be different based on business needs anyway. In addition at the database level there will be replication tools.
True synchronization requires some data that I hope your database schema has (you can read the SyncML doc to see how they proceed). Sync4J won't help you much, it's really high-level and XML oriented. If you don't foresee any conflicts (which means: really easy synchronisation), you could try with a lightweight ETL like Enhydra Octopus.
I'm primarily using Oracle at the moment, and the most full-featured route I've come across is Red Gate's Data Compare:
http://www.red-gate.com/products/oracle-development/data-compare-for-oracle/
This old blog gives a good summary of the solution routes available:
http://www.novell.com/coolsolutions/feature/17995.html
The JDBC-specific offerings I've come across have been very basic. The solution mentioned by Aidos seems the most feature complete if you want to go down the publish-subscribe route:
http://symmetricds.codehaus.org/
Hope this helps.