Morphia 操作 MongoDB.docx

Morphia操作 MongoDB上两篇文章:/hoojo/archive/2011/06/01/2066426.html/hoojo/archive/2011/06/02/2068665.html介绍到了在MongoDB的控制台完成MongoDB的数据操作、以及通过Java MongoDB 的驱动完成在Java中对MongoDB的操作，通过前两篇文章我们对MongoDB有了全面、深刻的认识和理解。现在我们就看看利用Morphia库来操作MongoDB。开发环境：System：WindowsIDE：eclipse、MyEclipse 8Database：mongoDB开发依赖库：JavaEE5、mongo-2.5.3.jar、junit-4.8.2.jarEmail：hoojo_126.comBlog：/IBM_hoojo/一、 准备工作1、 首先，下载mongoDB对Java支持的驱动包驱动包下载地址：/mongodb/mongo-java-driver/downloadsmongoDB对Java的相关支持、技术：/display/DOCS/Java+Language+Center驱动源码下载：/mongodb-mongo-java-driver-r2.6.1-7-g6037357.zip在线查看源码：/mongodb/mongo-java-driverMorphia jar包下载：/p/morphia/downloads/list2、 下面建立一个JavaProject工程，导入下载下来的驱动包。即可在Java中使用Morphia，目录如下：二、 Java操作MongoDB示例在本示例之前你需要启动mongod.exe的服务，在你安装mongoDB的目录中，找到mongod.exe启动服务后，下面的程序才能顺利执行；1、 Java操作mongoDB数据库，操作索引Mongo mongo = new Mongo();这样就创建了一个MongoDB的数据库连接对象，它默认连接到当前机器的localhost地址，端口是27017。DB db = mongo.getDB(“test”);这样就获得了一个test的数据库，如果mongoDB中没有创建这个数据库也是可以正常运行的。如果你读过上一篇文章就知道，mongoDB可以在没有创建这个数据库的情况下，完成数据的添加操作。当添加的时候，没有这个库，mongoDB会自动创建当前数据库。得到了db，下一步我们要获取一个“聚集集合DBCollection”，通过db对象的getCollection方法来完成。DBCollection users = db.getCollection(users);这样就获得了一个DBCollection，它相当于我们数据库的“表”。查询所有数据DBCursor cur = users.find();while (cur.hasNext() System.out.println(cur.next();用BasicDBObjectBuilder，向users对象中添加数据user = BasicDBObjectBuilder.start(id, 1546555).append(name, jojo).add(address, gz).append(email, hoojo_126.com).get();插入数据users.insert(user);可以利用JSON工具来序列化对象数据JSON.serialize(cur)完整源码package com.hoo.test;import .UnknownHostException;import com.hoo.entity.User;import com.hoo.util.BasicDBObjectUtils;import com.mongodb.BasicDBObjectBuilder;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.Mongo;import com.mongodb.MongoException;import com.mongodb.util.JSON;/*function:Mongo实例对象的相关方法测试*authorhoojo*createDate2011-5-24下午02:42:29*fileMongoDBTest.java*packagecom.hoo.test*projectMongoDB*blog/IBM_hoojo*emailhoojo_126.com*version1.0*/publicclass MongoDBTest publicstaticvoid main(String args) throws UnknownHostException, MongoException Mongo mg = new Mongo();System.out.println(查询所有的Database的名称);for (String name : mg.getDatabaseNames() System.out.println(dbName: + name);System.out.println(查询test库中的所有collection集合（表）名称);DB db = mg.getDB(test);for (String name : db.getCollectionNames() System.out.println(collectionName: + name);System.out.println(添加测试数据);DBCollection users = db.getCollection(users);try / 用自定义BasicDBObjectUtils工具类，将User Enity对象转换成DBObjectDBObject user = BasicDBObjectUtils.castModel2DBObject(new User(345567, jack, 22, beijin);users.insert(user);/ 用BasicDBObjectBuilder构建一个DBObject对象user = BasicDBObjectBuilder.start(id, 1546555).append(name, jojo).add(address, gz).append(email, hoojo_126.com).get();users.insert(user); catch (Exception e) e.printStackTrace();System.out.println(游标查询所有users集合数据);DBCursor cur = users.find();while (cur.hasNext() System.out.println(cur.next();System.out.println(查询游标相关内容);System.out.println(cur.count();System.out.println(cur.getCursorId();System.out.println(cur.getOptions();System.out.println(cur.getQuery();System.out.println(cur.getSizes().listIterator();System.out.println(cur.itcount();/System.out.println(cur.length();System.out.println(cur.size();System.out.println(cur.numGetMores();System.out.println(cur.curr();/System.out.println(cur.toArray().get(0);System.out.println(显示游标查询到的所有内容： + JSON.serialize(cur);工具类，将带有getter、setter方法的Java类序列化成DBObject对象package com.hoo.util;import java.lang.reflect.Method;import com.mongodb.BasicDBObject;import com.mongodb.DBObject;/*function:将Entity/Model转换成DBObject*authorhoojo*createDate2011-5-30下午01:53:08*fileBasicDBObjectUtil.java*packagecom.hoo.util*projectMongoDB*blog/IBM_hoojo*emailhoojo_126.com*version1.0*/publicclass BasicDBObjectUtils publicstatic DBObject castModel2DBObject(T entity) throws Exception Method method = entity.getClass().getMethods();DBObject dbObject = new BasicDBObject();for (Method m : method) /System.out.println(m.getName();if (m.getName().startsWith(get) String name = m.getName().replace(get, );for (Method m2 : method) if (m2.getName().equals(set + name) name = name.substring(0, 1).toLowerCase() + name.substring(1);Object returnVal = m.invoke(entity, new Object );if (returnVal != null) /System.out.println(name + : + m.invoke(shipping, new Object );dbObject.put(name, returnVal);System.out.println(dbObject: + dbObject);return dbObject;2、 完成索引操作，首先建立一个MongoDB4IndexTest.java，基本测试代码如下：package com.hoo.test;import .UnknownHostException;importjava.util.ArrayList;importjava.util.List;importorg.bson.types.ObjectId;import org.junit.After;import org.junit.Before;importorg.junit.Test;importcom.mongodb.BasicDBObject;importcom.mongodb.Bytes;import com.mongodb.DB;import com.mongodb.DBCollection;importcom.mongodb.DBCursor;importcom.mongodb.DBObject;import com.mongodb.Mongo;import com.mongodb.MongoException;importcom.mongodb.QueryOperators;importcom.mongodb.util.JSON;/* * function:实现MongoDB的Index操作 * authorhoojo * createDate 2011-6-2 下午03:21:23 * fileMongoDB4IndexTest.java * package com.hoo.test * project MongoDB * blog /IBM_hoojo * email hoojo_126.com * version 1.0 */publicclass MongoDB4IndexTest private Mongo mg = null;private DB db;private DBCollection users;Beforepublicvoid init() try mg = new Mongo();/mg = new Mongo(localhost, 27017); catch (UnknownHostException e) e.printStackTrace(); catch (MongoException e) e.printStackTrace();/获取temp DB；如果默认没有创建，mongodb会自动创建db = mg.getDB(temp);/获取users DBCollection；如果默认没有创建，mongodb会自动创建users = db.getCollection(users);Afterpublicvoid destory() if (mg != null)mg.close();mg = null;db = null;users = null;System.gc();publicvoid print(Object o) System.out.println(o);3、 下面完成对象Collection的index的操作/*function:测试Collection的index相关操作*authorhoojo*createDate2012-2-16下午08:32:26*/Testpublicvoid testIndex() query();for (DBObject index : coll.getIndexInfo() print(IndexInfo: + index);coll.dropIndexes();/创建索引coll.createIndex(new BasicDBObject(name, idx_name);print(coll.findOne(new BasicDBObject(name, haha);coll.createIndex(coll.findOne(new BasicDBObject(name, haha);DBObject o = new BasicDBObject(unique, true);/coll.createIndex(coll.findOne(), o);/ 修改索引，如果存在就修改不存在就添加coll.ensureIndex(o);coll.ensureIndex(age_1);coll.ensureIndex(new BasicDBObject(age3_1, 6), new BasicDBObject(ts, -1);coll.ensureIndex(new BasicDBObject(age_2, 1), new BasicDBObject( ts , 1 );coll.ensureIndex(new BasicDBObject(password, 2), new BasicDBObject( z , idx );coll.ensureIndex(new BasicDBObject(password, 1), new BasicDBObject( etc , idx );/ 创建唯一索引coll.ensureIndex(new BasicDBObject(emial, 2), new BasicDBObject(unique, false);/ 创建索引，指定索引名称default_indexcoll.ensureIndex(new BasicDBObject(address, 1), new BasicDBObject( name , default_index);/ 创建索引对象，索引名称user_indexcoll.ensureIndex(coll.findOne(new BasicDBObject(name, hoho), user_index);/ 唯一索引coll.ensureIndex(coll.findOne(new BasicDBObject(name, hehe), users_index_unique, true);/ 查询所有索引for (DBObject index : coll.getIndexInfo() print(IndexInfo: + index);print(DBCollection.genIndexName(coll.findOne();/coll.dropIndex(coll.findOne();print(DBCollection.genIndexName(new BasicDBObject(password, 2);/coll.dropIndex(DBCollection.genIndexName(new BasicDBObject(password, 2);/coll.dropIndexes();/coll.dropIndexes(assword_1);三、 Morphia基本操作1、 morphia可以利用annotation对JavaEntity进行注解，那样我们就可以用morphia操作JavaEntity对象package com.hoo.entity;import com.google.code.morphia.annotations.Entity;import com.google.code.morphia.annotations.Id;/*function:JavaEntity对象*authorhoojo*createDate2011-5-31上午11:45:21*fileUser.java*packagecom.hoo.entity*projectMorphia*blog/IBM_hoojo*emailhoojo_126.com*version1.0*/利用morphia的annotation进行注解Entitypublicclass User Idprivatelongid;private String name;privatebooleansex;privateintage;private String address;public User() public User(long id, String name, boolean sex, int age, String address) super();this.id = id; = name;this.sex = sex;this.age = age;this.address = address;/getter、setterOverridepublic String toString() returnthis.id + # + + # + this.age + # + this.sex + # + this.address;2、 对Morphia对象一些简单的使用，看看该对象提供了哪些基本的操作方法package com.hoo.test.morphia;import .UnknownHostException;import org.junit.After;import org.junit.Before;import org.junit.Test;import com.google.code.morphia.Datastore;import com.google.code.morphia.EntityInterceptor;import com.google.code.morphia.Morphia;import com.google.code.morphia.mapping.MappedClass;import com.google.code.morphia.mapping.Mapper;import com.google.code.morphia.mapping.cache.EntityCache;import com.hoo.entity.User;import com.mongodb.BasicDBObjectBuilder;import com.mongodb.Mongo;import com.mongodb.MongoException;/*function:morphia对象的简单测试*authorhoojo*createDate2011-5-31上午11:30:20*fileTest.java*packagecom.hoo.test*projectMorphia*blog/IBM_hoojo*emailhoojo_126.com*version1.0*/publicclass MorphiaTest private Mongo mongo;private Morphia morphia;Beforepublicvoid init() try mongo = new Mongo(); catch (UnknownHostException e) e.printStackTrace(); catch (MongoException e) e.printStackTrace();morphia = new Morphia();privatevoid print(Object o) if (o != null) System.out.println(o.toString();/*function:morphia对象的简单测试*authorhoojo*/SuppressWarnings(deprecation)Testpublicvoid testMorphia() / 创建一个Datastore，过时的方法不推荐使用Datastore ds = morphia.createDatastore(myTestDB);print(createDatastore: + ds);/ 创建dsds = morphia.createDatastore(mongo, myTestDB);print(createDatastore: + ds);/ 创建一个带用户名、密码的ds/ds = morphia.createDatastore(mongo, myTestDB, admin, new char 1, 2, 3, 4, 5, 6 );/ 设置操作资源对象，这里设置User.class 就可以完成对User的一系列操作/morphia.map(User.class);/morphia.mapPackage(com.hoo.entity);/会把整个包下面的类都加载进来/ 将对象转成DBObjectprint(toDBObject: + morphia.toDBObject(new User(System.currentTimeMillis(), jackson, true, 22, null);/ 将参数2转换成参数1的类型print(fromDBObject: + morphia.fromDBObject(User.class, BasicDBObjectBuilder.start(sex, true).get();print(getMapper: + morphia.getMapper();print(isMapped: + morphia.isMapped(User.class);/*function:对Mapper对象相关操作*authorhoojo*createDate2012-2-16下午10:20:38*/Testpublicvoid testMapper() Mapper mapper = morphia.getMapper();/ 添加对象映射print(addMappedClass: + mapper.addMappedClass(User.class);/print(mapper.addMappedClass(mapper.addMappedClass(User.class);/ 创建实体缓存print(createEntityCache: + mapper.createEntityCache();print(mapper.getCollectionName(myTestDB);print(mapper.getConverters();User user = new User(System.currentTimeMillis(), jackson, true, 22, null);user.setId(1306814012734L);print(mapper.getId(user);for (EntityInterceptor ei : mapper.getInterceptors() System.out.println(EntityInterceptor: + ei);/ 查询主键print(getKey: + mapper.getKey(user);/ 所有已经映射的classfor (MappedClass mc : mapper.getMappedClasses() System.out.println(getMappedClasses: + mc);print(mcMap: + mapper.getMCMap();print(getOptions: + mapper.getOptions();print(keyToRef: + mapper.keyToRef(mapper.getKey(user);print(refToKey: + mapper.refToKey(mapper.keyToRef(mapper.getKey(user);/*function:实体缓存*authorhoojo*/Testpublicvoid testEntityCache() EntityCache ec = morphia.getMapper().createEntityCache();print(EntityCache: + ec);Datastore ds = morphia.createDatastore(mongo, myTestDB);User user = new User(System.currentTimeMillis(), jackson, true, 22, null);user.setId(1306814012734L);/ 添加实体ec.putEntity(ds.getKey(user), user);/ 代理ec.putProxy(ds.getKey(user), user);print(getKey: + ds.getKey(user);print(getProxy: + ec.getProxy(ds.getKey(user);print(getEntity: + ec.getEntity(ds.getKey(user);print(ec.exists(ds.getKey(user);print(stats: + ec.stats();Afterpublicvoid destory() mongo = null;morphia = null;System.gc();四、 利用Morphia完成对Datastore对象的CRUD操作1、 首先添加如下准备代码，随后的方法直接添加到该文件中即可package com.hoo.test.ds;import .UnknownHostException;import java.util.ArrayList;import java.util.List;import org.junit.After;import org.junit.Before;import org.junit.Test;import com.google.code.morphia.Datastore;import com.google.code.morphia.Key;import com.google.code.morphia.Morphia;import com.google.code.morphia.query.UpdateOperations;import com.hoo.entity.User;import com.mongodb.Mongo;import com.mongodb.MongoException;/*function:Datastore增删改查操作*authorhoojo*createDate2011-5-31下午06:29:04*fileDatastoreTest.java*packagecom.hoo.test.ds*projectMorphia*blog/IBM_hoojo*emailhoojo_126.com*version1.0*/publicclass DatastoreTest private Mongo mongo;private Morphia morphia;private Datastore ds;Beforepublicvoid init() try mongo = new Mongo(); catch (UnknownHostException e) e.printStackTrace(); catch (MongoException e) e.printStackTrace();morphia = new Morphia();morphia.map(User.class);ds = morphia.createDatastore(mongo, temp);privatevoid print(Object o) if (o != null) System.out.println(o.toString();/*function:查询所有*authorhoojo*createDate2012-2-16下午10:36:13*/privatevoid query() Iterable it = ds.createQuery(User.class).fetch();while(it.iterator().hasNext() print(fetch: + it.iterator().next();Afterpublicvoid destory() mongo = null;morphia = null;ds = null;System.gc();2、 增删改CUD操作/*function:CUD增删改*authorhoojo*createDate2012-2-16下午10:46:08*/Testpublicvoid testCUD() / 添加测试数据for (int i = 0; i 50; i+) User u = new User(System.currentTimeMillis() + i, test- + i, (i % 2 = 0)? true: false), 18 + i, china-gz# + i);print(ds.save(u);/ds.delete(ds.createQuery(User.class);List users = new ArrayList();users.add(new User(1306907246518L, zhangsan, true, 22, china-gz);User user = new User(System.currentTimeMillis() + 3, zhaoliu, true, 29, china-beijin);users.add(user);users.add(new User(System.currentTimeMillis() + 6, wangwu, true, 24, china-shanghai);users.add(new User(System.currentTimeMillis() + 9, lisi, true, 26, china-wuhan);/添加集合print(save: + ds.save(users);/添加数组print(save: + ds.save(users.toArray();this.query();print(getKey: + ds.find(User.class, id, 1306907246518L).getKey();/修改操作UpdateOperations uo = ds.createUpdateOperations(User.class);print(update: + ds.update(ds.find(User.class, id, 1306907246518L).getKey(), uo).getUpdatedCount();uo.add(name, zhaoliuliu).set(age, 29).set(sex, true).add(address, gzz);print(update: + ds.update(ds.find(User.class, id, 1306907246518L).getKey(), uo).getUpdatedCount();print(update: + ds.update(ds.createQuery(User.class).field(id).equal(1306907246518L), uo).getUpdatedCount();print(update: + ds.update(ds.find(User.class, id, 1306907246518L), uo).getUpdatedCount();uo = ds.createUpdateOperations(User.class);uo.set(name, zhaoqq).set(age, 29).set(sex, true).add(address, fzz);print(update: + ds.update(ds.find(User.class, id, 1306907246518L).get(), uo).getUpdatedCount();print(update: + ds.update(ds.createQuery(User.class).field(id).equal(1306907246518L), uo, true).getUpdatedCount();/ 修改第一个对象print(updateFirst: + ds.updateFirst(ds.createQuery(User.class).field(id).equal(1306907246518L), uo).getUpdatedCount();/当参数createIfMissing为true的时候，如果修改的对象不存在就会添加这条数据，如果为false的情况下，不存在也不添加print(updateFirst: + ds.updateFirst(ds.createQuery(User.class).field(id).equal(1306907246519L), uo, true).getUpdatedCount();user.setId(1306907246518L);print(updateFirst