1 //...此处省略了import... 2 /** 3 * Created by shenzhigang on 4/15/16. 4 */ 5 public class Main { 6 public static void main(String[] args) { 7 Datastore datastore; 8 final Morphia morphia = new Morphia(); 9 morphia.mapPackage("com.bdb.datatypes.common.po");10 datastore = morphia.createDatastore(new MongoClient("localhost", 27017), "test001");11 datastore.ensureIndexes();12 13 Student student = new Student();14 student.setName("沈志刚");15 student.setAge(30);16 17 School school = new School();18 school.setName("苏州小学");19 school.setAddress("苏州市");20 datastore.save(school);21 22 student.setSchool(school);23 datastore.save(student);24 25 List<Key<School>> schools =datastore.createQuery(School.class).field("name").equal("苏州小学").asKeyList();26 List<Student> studentList = datastore.find(Student.class).field("school").in(schools).asList();27 }28 }29 30 @Entity31 class Student {32 @Id33 private ObjectId objectId ;34 private String name;35 private int age;36 @Reference37 private School school;38 //...此处省略了get set.... 39 }40 41 @Entity42 class School {43 @Id44 private ObjectId objectId;45 private String address;46 private String name;47 //....此处省略了get set...48 }49
原标题:mongodb morphia关联查询一例
关键词:MongoDB