twist

Yet Another Google App Engine Datastore ORM with a twist! (We need your support, fork it, and try it)

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 :: Twist :: Object Mapping ::

twists aims to provide a lightweight Object mapping framework. Without adding complexity into the api.

Persisting POJO's, Maps and (soon Primitive types) directly into the datastore.

###Setup

@Inject
ObjectStore store;

Friend friend = createComplexFriend();

Key key = store.put(friend);

Friend saved = store.get(Friend.class, friend.getId()); 

Iterator<Friend> all = store.find(Friend.class).greaterThanOrEqual("name", "Joe").now();

Friend one = store.findOne(Friend.class).greaterThanOrEqual("name", "Joe").now();

###Updating

####Save

Passing an object to the put(..) method will do the job.

Friend joe = new Friend("Joe", 27);

store.put(joe);
joe.age = 28;
store.put(joe);

####Update

store.update(Friend.class).equals("name", "Joe").increment("age",1).now();
store.update(Friend.class).equals("name", "Joe").set("address", new Address(...)).now();
store.update(Friend.class).equals("name", "Joe").with(new Friend(..)).now();

####Insert

store.put(new Friend(..));
store.put(new Friend(..), new Friend(..));

####Remove

store.delete(key);
store.delete(friend.getId());

###Object Mapping

@Entity(name="CloseFriends") // Optional name
public class Friend {
    @Id
    private long id; // Can be long, Long or String only
    
    @Parent
    private Circle circle;
    
    @Child
    private Box box;
    
    @Embedded
    private Map map;
    
    private List<String> notes; 
}

###Querying

###Find & FindOne

Iterator<Friend> all = store.find(Friend.class).greaterThanOrEqual("name", "Joe").now();
Friend one = store.findOne(Friend.class).greaterThanOrEqual("name", "Joe").now();

####Projection and Field selection

store.find(Friend.class).projection("firstName", "address").greaterThanOrEqual("name", "Joe").now();

####Sorting

store.find(Friend.class).sortAscending("firstName").now();
store.find(Friend.class).sortDescending("lastName").now();

####Skip and Limit

store.find(Friend.class).skip(20).now();
store.find(Friend.class).limit(10).now();

Version

0.0.1

Tech

twist uses a number of open source projects to work properly:

[GAE SDK] - SDK for the AppEngine platform (GAE, AppScale or CapeDwarf)
boon

Installation

mvn clean install

or add this to your POM:

    <repositories>
        <!-- Snapshot repository -->
        <repository>
            <id>oss-jfrog-artifactory-snapshots</id>
            <name>oss-jfrog-artifactory-snapshots</name>
            <url>http://oss.jfrog.org/artifactory/oss-snapshot-local</url>
        </repository>
    </repositories>

Dependency

    <dependency>
	  <groupId>com.textquo</groupId>
	  <artifactId>twist</artifactId>
	  <version>0.0.1-SNAPSHOT</version>
	</dependency>

Contribution

Anyone is welcome to contribute, implement feature or fix bugs.

License

Apache License, Version 2.0