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Table of contents

Connecting to relational database with Java

Requirements

  • Flexmonster Pivot Component version 2.213 or higher
  • Java 7 or higher
  • Driver for the database

Supported databases

Step 1: Embed the component into your web page

You already have in your HTML page an empty component. If Flexmonster Component is not embedded – return to Quickstart. Your code should look like the following example:

<div id="pivotContainer">The component will appear here</div>
<script src="flexmonster/lib/jquery.min.js"></script>
<script src="flexmonster/flexmonster.js"></script>

<script>
	var pivot = $("#pivotContainer").flexmonster({
		toolbar: true,
		licenseKey: "XXXX-XXXX-XXXX-XXXX-XXXX"
	});
</script>

Step 2: Setup Data Compressor on the server

First of all, you need to add the following dependencies to your project:

  • Appropriate database driver
  • flexmonster-compressor.jar – it is located in the Download Package

Below is the connection and query sample for MySQL database:

Class.forName("com.mysql.jdbc.Driver").newInstance();
String connectionString = "jdbc:mysql://localhost:3306/foodmart";
Connection connection = 
	DriverManager.getConnection(connectionString, "user", "pass");
String query = "SELECT * FROM customer";
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(query);

The following line of code will convert ResultSet to compressed InputStream:

InputStream inputStream = Compressor.compressDb(resultSet);

Now, you can create a response from the InputStream. For simple cases, it is enough to read all content:

Scanner s = new Scanner(inputStream).useDelimiter("\\A");
String output = s.hasNext() ? s.next() : "";

Also, it is possible to create streaming response. It means that the end user will get the response almost without delay and server will use less amount of memory. It is recommended way for large datasets:

response.setContentType("text/plain");
OutputStream outputStream = response.getOutputStream();
int length = 0;
byte[] buffer = new byte[10240];
while ((length = inputStream.read(buffer)) > 0) {
    outputStream.write(buffer, 0, length);
    outputStream.flush();
}

Full project is available at the server/java/ inside Download Package.

Step 3: Enable cross-origin resource sharing (CORS).

By default, browser prevents JavaScript from making requests across domain boundaries. CORS allows web applications to make cross-domain requests. Here are some useful links explaining how to setup CORS on your server:

Step 4: Configure report with your own data

Now it’s time to configure Flexmonster Pivot Component on the web page. Let’s create a minimal report for this (replace filename and other parameters with your specific values):

var pivot = $("#pivotContainer").flexmonster({
	toolbar: true,
	report: {
		dataSource: {
			dataSourceType: "ocsv",
			/* URL to the Data Compressor Java */
			filename: "http://localhost:8400/FlexmonsterCompressor/get"
		}
	},
	licenseKey: "XXXX-XXXX-XXXX-XXXX-XXXX"
});

Launch the web page from browser — here you go! A pivot table is embedded into your project. Check the example on JSFiddle.

Examples

Saving to file

Class.forName("com.mysql.jdbc.Driver").newInstance();
String connectionString = "jdbc:mysql://localhost:3306/foodmart";
Connection connection = 
	DriverManager.getConnection(connectionString, "user", "pass");
String query = "SELECT * FROM customer";
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(query);

InputStream inputStream = Compressor.compressDb(resultSet);
OutputStream outputStream = new FileOutputStream("data.ocsv");
int length = 0;
byte[] buffer = new byte[10240];
while ((length = inputStream.read(buffer)) > 0) {
    outputStream.write(buffer, 0, length);
}
inputStream.close();
outputStream.close();