Connecting to Java-based Data Sources

The COM Data Source driver is targeted at Visual Basic and Visual C++ developers. Because Crystal Reports 10 has a full Java SDK, an equivalent Java Data Source driver provides equivalent functionality of the COM driver for developers using the Java platform.

The process of creating a Java Data Source driver is conceptually similar to that of creating a COM Data Source driver. A Java class needs to be created that has a public function with a return type of ResultSet or CachedRowSet. A ResultSet is the standard object returned from a JDBC-based query, whereas the CachedRowSet is a disconnected recordset useful for parsing out things like XML. Listing 15.2 shows a simple Java Data Provider that returns a ResultSet.

Listing 15.2. A Java Data Provider That Returns Data from the Sample Database

import java.lang.*;

import java.sql.*;

public class XtremeDataProvider


 public ResultSet Employee()


 // connect to the database


 String url = "jdbc:odbc:Xtreme Sample Database 10";

 Connection con = DriverManager.getConnection(url, "", "");

 // run a SQL query

 Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,


 String query = "SELECT * FROM Employee";

 ResultSet rs = stmt.executeQuery(query);

 // return the results of the query

 return rs;



To identify a Java class, instead of typing in its name, place the .class file into a given directory, and add that directory's name to the following Registry key of your Windows operating system:



HKEY_LOCAL_MACHINESoftwareCrystal DecisionsCrystal Reports 10DatabaseOptions graphics/ccc.gifJavaUserClassPath

During the process of creating a report, Crystal Reports searches through all classes contained in the folder(s) specified in the Registry key discussed previously. It then provides a list of methods with return types of ResultSet. The same rules about function arguments apply. Any arguments to the Java method are mapped to report parameter fields. Using Java code, you can control exactly what data comes back.

Part I. Crystal Reports Design

Creating and Designing Basic Reports

Selecting and Grouping Data

Filtering, Sorting, and Summarizing Data

Understanding and Implementing Formulas

Implementing Parameters for Dynamic Reporting

Part II. Formatting Crystal Reports

Fundamentals of Report Formatting

Working with Report Sections

Visualizing Your Data with Charts and Maps

Custom Formatting Techniques

Part III. Advanced Crystal Reports Design

Using Cross-Tabs for Summarized Reporting

Using Record Selections and Alerts for Interactive Reporting

Using Subreports and Multi-Pass Reporting

Using Formulas and Custom Functions

Designing Effective Report Templates

Additional Data Sources for Crystal Reports

Multidimensional Reporting Against OLAP Data with Crystal Reports

Part IV. Enterprise Report Design Analytic, Web-based, and Excel Report Design

Introduction to Crystal Repository

Crystal Reports Semantic Layer Business Views

Creating Crystal Analysis Reports

Advanced Crystal Analysis Report Design

Ad-Hoc Application and Excel Plug-in for Ad-Hoc and Analytic Reporting

Part V. Web Report Distribution Using Crystal Enterprise

Introduction to Crystal Enterprise

Using Crystal Enterprise with Web Desktop

Crystal Enterprise Architecture

Planning Considerations When Deploying Crystal Enterprise

Deploying Crystal Enterprise in a Complex Network Environment

Administering and Configuring Crystal Enterprise

Part VI. Customized Report Distribution Using Crystal Reports Components

Java Reporting Components

Crystal Reports .NET Components

COM Reporting Components

Part VII. Customized Report Distribution Using Crystal Enterprise Embedded Edition

Introduction to Crystal Enterprise Embedded Edition

Crystal Enterprise Viewing Reports

Crystal Enterprise Embedded Report Modification and Creation

Part VIII. Customized Report Distribution Using Crystal Enterprise Professional

Introduction to the Crystal Enterprise Professional Object Model

Creating Enterprise Reports Applications with Crystal Enterprise Part I

Creating Enterprise Reporting Applications with Crystal Enterprise Part II

Appendix A. Using Sql Queries In Crystal Reports

Creating Enterprise Reporting Applications with Crystal Enterprise Part II

Special Edition Using Crystal Reports 10
Special Edition Using Crystal Reports 10
ISBN: 0789731134
EAN: 2147483647
Year: 2003
Pages: 341 © 2008-2020.
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