Enable Leon’s MongoDB module¶

Leon’s MongoDB module can be enabled by adding the following line to Leon’s configuration file:

install(new Packages.io.leon.persistence.mongo.LeonMongoModule());

Setting up a connection¶

Without specifying any connection parameters Leon connects to the following database:

• Host: 127.0.0.1
• Port: 27017
• Database: leon_test

To pass your own connection parameters you can use the LeonMongoConfig object. How to do this shows the following example:

var mongoConfig = new Packages.io.leon.persistence.mongo.LeonMongoConfig("mongo0.example.com",
 27017, "your_database");

install(new Packages.io.leon.persistence.mongo.LeonMongoModule(mongoConfig));

Working with MongoDB¶

If you have enabled Leon’s MongoDB module, the MongoDB connection is bound to the server-side variable leon.mongo.

To access a Mongo collection within a server-side JavaScript file just use its name in the scope of leon.mongo. For example, the code to insert a document in a collection named people looks like this:

leon.mongo.people.insert({name: "John Doe"});

That’s all! If the collection doesn’t exist, MongoDB will create it for you.

To query a collection you can use the function find:

var cursor = leon.mongo.people.find({name: /^John.*$/});
cursor.forEach(function(person) {
  // do something with the person
});

The example above queries the collection people for documents with a field name starting with “John”. The function find returns a cursor that can be used to iterate over the result.

Please see the MongoDB documentation [2] for more information about MongoDB functions. Generally speaking, all functions MongoDB provides can be accessed via Leon’s Mongo module.

Using MongoDB from Java¶

TODO