@Model
public class User {
    int age;
    String name;
    Cat cat;
    List<Dog> dogs;
}

@Model
public class Dog {
    String name;
}

@Model
public class Cat {
    String shortName;
}

UserEntityManager userEntityManager = new UserEntityManager();

User user = ... // Create a new object
userEntityManager.add(user);</pre> </div>
 
   Querying
 
Freezer query engine uses a fluent interface to construct multi-clause queries.
 
   Simple
 
To find all users:
 

 
List<User> allUsers = userEntityManager.select()
                             .asList();
 
 
To find the first user who is 3 years old: 
 

 
User user3 = userEntityManager.select()
                    .age().equalsTo(3)
                    .first();
 
 
   Complex
 
To find all users 
 
 
 
with name "Florent"

or who own a cat with shortNamed "Java" 
or who own a dog named "Sasha" 
 
 
you would write: 
 

 
List<User> allUsers = userEntityManager.select()
                                .name().equalsTo("Florent")
                             .or()
                                .cat(CatEntityManager.where().shortName().equalsTo("Java"))
                             .or()
                                .dogs(DogEntityManager.where().name().equalsTo("Sasha"))
                             .asList();
 
 
   Selectors
 

 
//strings
     .name().equalsTo("florent")
     .name().notEqualsTo("kevin")
     .name().contains("flo")
//numbers
     .age().equalsTo(10)
     .age().notEqualsTo(30)
     .age().greatherThan(5)
     .age().between(10,20)
//booleans
     .hacker().equalsTo(true)
     .hacker().isTrue()
     .hacker().isFalse()
 
 
   Aggregation
 
The QueryBuilder offers various aggregation methods:
 

 
float agesSum      = userEntityManager.select().sum(UserColumns.age);
float agesAverage  = userEntityManager.select().average(UserColumns.age);
float ageMin       = userEntityManager.select().min(UserColumns.age);
float ageMax       = userEntityManager.select().max(UserColumns.age);
int count          = userEntityManager.select().count();
 
 
   Entities
 
Freezer makes it possible, yes you can design your entities as your wish:
 

 
@Model
public class MyEntity {

    // primitives
    [ int / float / boolean / String / long / double ] field;

    // arrays
    [ int[] / float[] / boolean[] / String[] / long[] / double ] array; 

    // collections
    [ List<Integer> / List<Float> / List<Boolean> / List<String> / List<Long> / List<Double> ] collection;

    // One To One
    MySecondEntity child;

    // One To Many
    List<MySecondEntity> childs;
}
 
 
   Logging
 
You can log all SQL queries from entities managers:
 

 
userEntityManager.logQueries((query, datas) -> Log.d(TAG, query) }
 
 
   It's always better with a context
 
Don't forget to initialise Freezer in your application:
 

 
public class MyApplication extends Application {

    @Override public void onCreate() {
        super.onCreate();
        Freezer.onCreate(this);
    }

}
 
 
   Migration
 
To handle schema migration, just add @Migration(newVersion) in a static method, then describe the modifications:
 

 
public class DatabaseMigration {

    @Migration(2)
    public static void migrateTo2(Migrator migrator) {
        migrator.update("User")
                .removeField("age")
                .renameTo("Man");
    }

    @Migration(3)
    public static void migrateTo3(Migrator migrator) {
        migrator.update("Man")
                .addField("birth", ColumnType.Primitive.Int);
    }

    @Migration(4)
    public static void migrateTo4(Migrator migrator) {
        migrator.addTable(migrator.createModel("Woman")
                .field("name", ColumnType.Primitive.String)
                .build());
    }
}
 
 
Migration isn't yet capable of:
 
 
 
changing type of field
adding/modifying One To One
adding/modifying One To Many
handling collections/arrays
 
 
   TODO
 
 
 
Update an entry
Improve migration
Add some selectors operations (like, ...)
Add Observable support
Provide an Asynchronous API
Add @Ignore annotation
Add unit tests
 
 
   Changelog
 
   1.0.1
 
Introduced Migration Engine.
 
   1.0.2
 
 
 
Support long & double
Support arrays
Improved QueryBuilder
Refactored cursors helpers
 </ul>
 
   A project initiated by Xebia
 
This project was first developed by Xebia and has been open-sourced since. We will continue working on it. We encourage the community to contribute to the project by opening tickets and/or pull requests.
 

 
   Download
 
  
 

 
buildscript {
  dependencies {
    classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
  }
}

apply plugin: 'com.neenbedankt.android-apt'
dependencies {
  compile 'fr.xebia.android.freezer:freezer:1.0.2'
  provided 'fr.xebia.android.freezer:freezer-annotations:1.0.2'
  apt 'fr.xebia.android.freezer:freezer-compiler:1.0.2'
}</pre> </div>
 
   License
 
Copyright 2015 Xebia, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.</pre>
項目地址： https://github.com/florent37/Freezer

                    
                    

                        
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