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tutorial

NetBeans/JPA Java EE 6 Tutorial

Step by step tutorial that demonstrates how to build a simple Java EE web application (with Servlet, JSP and an EJB Session Bean) in NetBeans using JPA.... basic guestbook page. Every visitor can sign the guestbook by filling a simple form. The visitors that have already signed are listed ... tutorial consists of the following steps: Step 1: Create a Java EE 6 Web Project Step 2: Entity Class and ...

 
tutorial

Eclipse/JPA Java EE 6 Tutorial

Step by step tutorial that demonstrates how to build a simple Java EE web application (with Servlet, JSP and an EJB Session Bean) in Eclipse using JPA.... basic guestbook page. Every visitor can sign the guestbook by filling a simple form. The visitors that have already signed are listed ... tutorial consists of the following steps: Step 1: Create a Java EE 6 Web Project Step 2: Entity Class and ...

 
manual

GROUP BY and HAVING clauses

Explains how to use the GROUP BY and HAVING clauses in a JPA/JPQL query. The GROUP BY clause enables grouping of query results. A JPQL query with a GROUP BY clause returns properties of generated groups instead of individual objects ... objects by the first letter of the country name. The next step is to pass the groups to the SELECT clause which returns the first letters ...

 
forum_thread

What are the steps of creating small web app?

Hello guys, I have a question about creating small new web application, I am almost done with researching and studying and I have covered all the important concepts e.g. # Starting from web technologies: HTML, CSS, JS, JQuery. # Moving to Java Technologies:  Core Java, Servlet, Managed Beans, JSF, JSP, EJB, JMS, JPA, JDBC,Security, Ajax using Primefaces. # Backend technologies: MYSQL, SQLite, JavaDB, BIRT/ Jasper reporting. Tools: Eclipse, Netbeanse, SVN, Git repositories, SQLyog, Glassfish. ------------- ... Avoid overflow of published source code examples by breaking long lines . You may mark in paragraph code words ... names) with the code style (can be applied by ctrl + D). Long stack traces (> 50 lines) and complex ...

 
page

ObjectDB Download

... click here. First Steps in using ObjectDB For step by step instructions on how to use ObjectDB in your IDE refer to one of the ...

 
tutorial

Report Generation with BIRT and JPA

Demonstrates how to use ObjectDB as a data source of the Business Intelligence and Reporting Tools (BIRT), open source report generator.... The tutorial consists of the following steps:  Step 1: Install BIRT and ObjectDB Driver Step 2: Create a Project and a Report Step 3: Create an ObjectDB Data ...

 
forum_thread

Slow searching with two indexes

I'm running queries on a large database (tens of millions of objects), and I'm running into a performance problem using two indexes.  An entity I'm querying has two indexed fields - one is the primary key (id) and so is different for each object, and the other is an object reference that only has a few tens of different values.   When I query by just the primary key, it's (of course) extremely fast, but when I also query using the other key, queries can take minutes.... has a few tens of different values.   When I query by just the primary key, it's (of course) extremely fast, but when I also ... Plan Description ======================   [ Step 1 ] Scan index com.spiffymap.sealog.model.NmeaBatch [ ...

 
forum_thread

Performance in large transactions

Hello, we have a performance problem when we use a large transaction. Let's do exactly the same in several transactions the ObjectDB works much faster. In our use case, we create many new entities and between the creations we call a select query. The execution of the query becomes slower at each iteration. (In the query, we search for an item of type Entity2. However, there is only one entity.)   Pseudocode for the fast and the slow solution FAST: ... and  test2_ManyTransactions), mentioned in step 3, are not found in the projects. Please follow the posting ... it would be better to use conventional inverse (mapped by) collection in MyEntity : @ Entity public ...

 
forum_thread

Difficulty with the BIRT plugin

Hi, am trying to get the BIRT plugin to work. Firstly: connecting to an odb server doesn't seem to work (incompatible versions) - but there isn't any way to find out what version the BIRT plugin is using. Next: connecting directly to a file datasource seems to work, in the sense that I can ping the database, however, there doesn't appear to be any way to create a new Data Set from the Data Explorer, as suggested in the online manual: ... manual: Open the [New Data Set] dialog box by right clicking the Data Sets node in the [Data Explorer] window and ... the instructions in the manual there is a more detailed step by step tutorial , that explains how exactly to create the data set. If ...

 
forum_thread

Eclipse plugin problem (using ObjectDB as a separate bundle)

Hello support, I have seen multiple attempts to correct similar errors as in the title above - the latest in the 2.2.8.01 release of objectDb. However I still get this error.   Here is my scenario (Groovy 1.8 and Eclipse 3.6) used. I have a com.epimss.lab.data.toxicology.TherapeauticDrugScreenRqst. Nested in this class are the following two classes: com.epimss.lab.data.misc.OtherRqst and com.epimss.lab.data.misc.RequestDateAndNumber. ... In an attempt to isoloate the problem I cleaned by project, and enhanced with ObjectDB with the small utility class ... you tried these steps yourself? For me it fails on step 3: Contact all update sites during install to find ...