Q: What is a "data source" and a "data set"? BIRT uses these terms to define how the report accesses data. Data Set — is a description of data to be retrieved. SQL queries are the ones most often used, but BIRT also supports a wide variety of sources such as stored procedures, Java classes and so on.

Author:Negrel Kagataur
Language:English (Spanish)
Published (Last):28 November 2011
PDF File Size:8.69 Mb
ePub File Size:14.95 Mb
Price:Free* [*Free Regsitration Required]

Q: What is a "data source" and a "data set"? BIRT uses these terms to define how the report accesses data. Data Set — is a description of data to be retrieved. SQL queries are the ones most often used, but BIRT also supports a wide variety of sources such as stored procedures, Java classes and so on.

Any one BIRT report can contain any number of data sets and data sources. Q: Can I build my own data set? The only requirement is that your data set return data in tabular format so that BIRT can perform sorting, aggregation, grouping and so on. There are two ways to build a data set: Scripted data set — Best for data sets that are used by one specific report.

For example, to access a specific set of application objects. Extended data sets are best when creating a generic feature used access a type of data source. For example, to access web logs. Scripted — Lets you write code to access other data sources. FlatFile - Allows acessing flat file data using standard delimiters. XPath syntax is used to specify columns. See the installation instructions. Use the ojdbc The older classes The ojdbc This can be used by entering sun. That is, those that 1 use scalar input parameters only or no parameters, and 2 retrieve a single result set directly, like those in SQL Server or Sybase instead of via a cursor output parameter like those in Oracle.

When writting a query against some JDBC data sources change the case of the result columns. For example select id,url from table; table with two columns: Some databases will return id others will return ID.

When this value is used in BIRT expressions, it will default to what the database returned. This will prevent the same report from working with the different databases. One solution to this problem is to use the alias column in the Data Set Editor.

If you initially design the report and the output column is in lowercase, add the column name in uppercase in the alias field. This should allow the Expression Builder to reference it as either value. You may use a jndi. See description in Bugzilla for more details. The username and password properties, if specified, are used in both cases. This gives you control over whether filtering and sorting is done within BIRT or within the database.

BIRT provides filtering capabilities in both the data set editor and in the Property editor for report items. These filters can include JavaScript expressions, including calls into your Java code.

BIRT executes such expressions in its own data engine. In the case, the filtering happens on the database, and cannot include JavaScript code: it must include only SQL valid for your target database. SQL filtering? It is more efficient to restrict the data within the query to eliminate the overhead of sending the data to BIRT.

BIRT provides a sorting option on tables and lists. When you define groups, BIRT implicitly defines a sort order. SQL sorting? For performance, use SQL sorting whenever possible, especially if your database has indexes that will speed up the sort. This can be done using the scripted data set element. Next, we need to identify the right element within the design to hold the glue code. The scripted data set has four methods: describe, open, fetch and close.

JavaScript has an import statement that creates a bridge to our Java objects. There are many ways to do this, but it is probably most appropriate to create an intermediate class, that calls the EJB and returns the values.

GreeterEjbClient ; ejbclient. See the examples page for a demonstration. DataInputStream new Packages. Obviously, you will want use an XML parser in this method to parse the document and set several row variable values based on all of the XML attribute and entity values. JDO Java Data Objects is used to connect to any source relational or non-relational while Hibernate is used to connect to relational databases.

You can access the objects as is described for POJOs above. An example of this will be placed on the web site shortly. Q: My class implements java. How do I use it as a data source? Start with an SQL parameter. Then, follow the SQL rules for parameters.

An SQL "? Note: the wildcards are DB-specific. Next, define a data set parameter. The parameters must have a one-to-one correspondence with your "? Data set parameters take a default value.

In theory, the default value should not be required unless it makes logical sense for your report design. It is possible to specify a report parameter as a default value, such as params["status"]. Q: How do I use Data Set parameters? There are two common ways to use data set parameters. First, you can bind them to a report parameter so that your user can select the data to display in the report.

Second, you can pass in data from another part of your report. For example, you can create a subreport that takes its parameter value from a master report. For example, you might get a list of customers the master report from an Oracle database. Then, for each customer, you might get the list of orders the detail report from a DB2 database. If a report item bound to a data set has a parameter binding, evaluate that expression and use the value as the data set parameter.

If not, then check if the data set parameter has a default value and use that. Otherwise, use null as the parameter value. Then, check if the parameter value is null.

If it is, and if the parameter does not allow null is not "nullable" , issue a runtime error. As an example you can setup connection on Tomcat as follows.

The designer prompts you to enter the server name, user name and password when building a JDBC data source. While this works for testing, production systems will often externalize this information from the report design so that the same design can work against both a test and production database, or against different production databases. Alternatively, you can reference a dynamic Connection Profile stored in an encrypted profile file.

They just know the domain specific terms. Can I create a custom data source and custom data set designer? You can provide both the run-time mechanism to access the data, as well as the design-time UI for defining your data set.

If your users are comforatable using a tool such as Eclipse, then they can use your custom UI to build reports within the BIRT designer. If, however, your users want a very simple tool, you can provide your own designer that asks the right questions, then generates the report for them, filling in all the "boiler plate", perhaps using one of several standard layouts defined by your app.

This reflects the "embedded" nature of BIRT. Q: How can I access application-specific metadata to simplify report design? This avoids having the report designer duplicate the efforts of the BPM designer.

The result allow the report design tool to have Business Process Intelligence built-in. The design step is the one where BPM integration would likely occur. A BIRT design is an XML file that contains instructions for accessing a data source, transforming the data sorting, filtering, totals , and presenting the results. An integrated application needs the ability to build a query based on the BPM.

First, you can develop a custom data set builder extension to the BIRT designer. The builder could leverage the meta-data information in the BPM.

The result would be a custom data set that looks to BIRT just like any other data set. Suppose further that the BPM system can provide descriptive information about customers, and about the fields for a customer.

A custom data set builder could display this information to help the user understand the data, and use the relationships to help the user choose the data of interest.

The details, of course, are likely to depend on the specific BPM system in question. Second, you can develop a custom report designer that is tightly integrated with the BPM system.


Integrate the BIRT Viewer with Java and Java EE web applications

A unique identifier for the viewer. This attribute is used to create a form and is required if using the isCustom attribute. This attribute must be unique. Valid values are true and false. Frameset is used by default.


Customizing the BIRT report viewer

One part of the application was to generate reports that are based on the data that is submitted in the backend. For the custom web application, it was decided to use Struts2 framework. The reports were developed by using BIRT designer. An easiest option was to use the BIRT runtime org. Apart from rendering the report, the client also needed to export the report in different formats, such as PDF or Excel. In addition to rendering the reports in various formats, this sample viewer also provides other useful features: Navigation through a large report by page and from a table of contents Running and generating reports in formats like HTML or PDF Exporting the report data in formats like CSV, TSV, and PSV Printing the report locally or at the server Testing and rerunning of the reports with other parameters Considering all these useful features, we preferred to reuse the sample BIRT viewer viewer application instead of writing custom code for viewing and downloading reports by using BIRT runtime API.


Viewer Usage


Related Articles