Embedding Mondrian in a Java Application

By Will Gorman; last updated April, 2007.


This document shows a simple example of embedding mondrian in a java application. The steps include downloading Mondrian, installing a database, writing a simple application, compiling the application, and running the application.

Setting up the Environment 

First, you need to download mondrian. You can get the latest release from SourceForge.

Download the Latest Release 

Download the latest mondrian-version.zip from SourceForge, and unzip. Now find the mondrian-version-src.zip inside this distribution, and unzip it within the mondrian binary distribution under the "src" directory.

Installing the Database 

Before you run this simple example, you must install the standard FoodMart dataset. This is described in the installation guide.

The Source Code 

Here is a simple example of embedding mondrian in a java class. A connection is retrieved, a query is generated and finally the query is executed. Open the file SimpleEmbeddedExample.java in the main Mondrian directory and paste the contents below.

import mondrian.olap.*;
import java.io.*;

public class SimpleEmbeddedExample {

  public static void main(String args[]) {

    // First, set up a valid connection string
    String connStr = "Provider=mondrian;" +
                     "Catalog=demo/FoodMart.xml;" +
                     "JdbcDrivers=com.mysql.jdbc.Driver;" +
                     "Jdbc=jdbc:mysql://localhost/foodmart?user=foodmart&password=foodmart;" +
                     "jdbcUser=foodmart;" +
                     "jdbcPassword=foodmart";

    // Second, set up a valid query string
    String queryStr = "select " +
                      "{[Measures].[Unit Sales]} on columns, " +
                      "{[Store].[All Stores]} on rows " +
                      "from [Sales]";

    // Third, retrieve a connection from the DriveManager
    Connection connection = DriverManager.getConnection(connStr, null, true);

    // Fourth, generate a MDX Query object
    Query query = connection.parseQuery(queryStr);

    // Fifth, execute the query
    Result result = connection.execute(query);

    // Finally, print out the result
    StringWriter sw = new StringWriter();
    PrintWriter pw = new PrintWriter(sw);
    result.print(pw);
    pw.flush();
    System.out.println(sw.toString());
  }

}

Note that you should replace the specific jdbc information with your own JDBC connection properties.

Compiling the Example  

To compile this example via the command line:

javac -cp "lib/mondrian.jar" SimpleEmbeddedExample.java

Running the Example  

Below is the java command line that will execute the SimpleEmbeddedExample class. Note that you must replace $JDBC_DRIVER_JAR_LOCATION with the correct path to your specific JDBC driver.

java -cp ".:src/lib/log4j-1.2.9.jar:src/lib/commons-dbcp.jar:src/lib/commons-pool.jar:src/lib/commons-collections.jar
:src/lib/commons-vfs.jar:src/lib/commons-logging.jar:src/lib/commons-math-1.0.jar:src/lib/javacup.jar
:src/lib/eigenbase-resgen.jar:src/lib/eigenbase-properties.jar:src/lib/eigenbase-xom.jar:lib/mondrian.jar
:$JDBC_DRIVER_JAR_LOCATION" SimpleEmbeddedExample

You should see this output:

log4j:WARN No appenders could be found for logger (mondrian.olap.MondrianProperties).
log4j:WARN Please initialize the log4j system properly.
Axis #0:
{}
Axis #1:
{[Measures].[Unit Sales]}
Axis #2:
{[Store].[All Stores]}
Row #0: 266,773

View Mondrian's API for more details on traversing the Result object.


Author: Will Gorman; last updated April, 2007.
Version: $Id: //open/mondrian/doc/embedding_mondrian.html#3 $ (log )
Copyright (C) 2005-2007 Julian Hyde