CAST supports MongoDB via its NoSQL for Java extension. Details about how this support is provided for Java source code is discussed below.
Supported Libraries
| Library | Supported? |
|---|---|
| Jongo - 1.4.0 |
|
| Mongo Java Driver - 3.12.8 |
|
Supported Operations
| For Storing the data | |
|---|---|
| For Fetching the data | |
| For Removing the data | |
| For Updating the data |
Objects
| Icon | Description |
|---|---|
| Java MongoDB database |
| Java MongoDB collection |
| Java unknown MongoDB database |
| Java unknown MongoDB collection |
Links
| Link type | Source and destination of link | Methods supported |
|---|---|---|
| belongsTo | From Java MongoDB collection object to Java MongoDB database object | |
| useLink | Between the caller Java Method objects (constructors also) and Java Mongo Collection Object |
|
useSelectLink | ||
| useUpdateLink | ||
| useDeleteLink | ||
| useInsertLink | ||
| *Bulkops results in the links as per the operations used |
Amazon DocumentDB Identification
The below mentioned objects have properties to indicate whether the object is of type MongoDB or Amazon DocumentDB.
Object | Property Description | Type of Property Value | Possible Value(s) | Meaning |
|---|---|---|---|---|
| Java MongoDB collection | Is an Amazon DocumentDB collection? | Integer | 1 | The collection object is of type Amazon DocumentDB |
| 0 | The collection object is of type MongoDB | |||
| Java unknown MongoDB collection | Is an Amazon DocumentDB collection? | Integer | 1 | The collection object is of type Amazon DocumentDB |
| 0 | The collection object is of type MongoDB |
What results can you expect?
Once the analysis/snapshot generation is complete, you can view the results in the normal manner (for example via CAST Enlighten). Some examples are shown below.
Creation of Database and Collection
public MongoUserDAO(DB db) {
Mongo mongo = new Mongo();
db = mongo.getDB("TestDatabase");
db.createCollection("User", dbo);
}
Insert Operation
public void insertDocuments(DBObject[] documents) {
userCol.insert(documents);
}
Select Operation
public void getCollection() {
DBCollection col = db.getCollection("User");
}
Update Operation
public void updateDoc(DBObject query, DBObject update) {
userCol.update(query, update);
}
Delete Operation
Amazon DocumentDB Identification
Sample Code
package com.sample.app;
import com.mongodb.MongoClient;
import com.mongodb.MongoClientURI;
import com.mongodb.ServerAddress;
import com.mongodb.MongoException;
import com.mongodb.client.MongoCursor;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.MongoCollection;
import org.bson.Document;
public final class App {
private App() {
}
public static void main(String[] args) {
String connectionString = "mongodb://root:rootroot@sample-cluster.cluster-cqjaxx9hbhi0.us-west-2.docdb.amazonaws.com:27017/?replicaSet=rs0&readpreference=secondaryPreferred";
MongoClientURI clientURI = new MongoClientURI(connectionString);
MongoClient mongoClient = new MongoClient(clientURI);
MongoDatabase testDB = mongoClient.getDatabase("library");
MongoCollection<Document> numbersCollection = testDB.getCollection("books");
Document doc = new Document("name", "title").append("value", "Harry Potter");
numbersCollection.insertOne(doc);
MongoCursor<Document> cursor = numbersCollection.find().iterator();
try {
while (cursor.hasNext()) {
System.out.println(cursor.next().toJson());
}
} finally {
cursor.close();
}
}
}
Evolution
- There will be no connection object created.
- Better resolution for database and collection name
- Support for CRUD APIs com.mongodb.client.MongoCollection
Limitations
- For the method 'mapReduce' the type of link produced is 'useLink' as its type is not determined
- If collection name is not resolved in the CRUD API, then link is created with unknown collection object.
- Setting of properties related to Amazon DocumentDB identification depends on proper resolution of connection string.