上两篇文章: http://www.cnblogs.com/hoojo/archive/2011/06/01/2066426.html
http://www.cnblogs.com/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：Windows
IDE：eclipse、MyEclipse 8
Database：mongoDB
开发依赖库：
JavaEE5、mongo-2.5.3.jar、junit-4.8.2.jar
Email：hoojo_@126.com
Blog： http://blog.csdn.net/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： https://github.com/mongodb/mongo-java-driver/downloads
mongoDB对Java的相关支持、技术： http://www.mongodb.org/display/DOCS/Java+Language+Center
驱动源码下载： https://download.github.com/mongodb-mongo-java-driver-r2.6.1-7-g6037357.zip
在线查看源码： https://github.com/mongodb/mongo-java-driver
Morphia jar包下载： http://code.google.com/p/morphia/downloads/list
2、 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
java.net.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;
/**
* <b>function:</b> Mongo实例对象的相关方法测试
* @author hoojo
* @createDate 2011-5-24 下午02:42:29
* @file MongoDBTest.java
* @package com.hoo.test
* @project MongoDB
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
public
class
MongoDBTest {
public
static
void
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DBObject
DBObject 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;
/**
* <b>function:</b> 将Entity/Model转换成DBObject
* @author hoojo
* @createDate 2011-5-30下午01:53:08
* @file BasicDBObjectUtil.java
* @package com.hoo.util
* @project MongoDB
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
publicclass BasicDBObjectUtils {
public
static
<T> 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
java.net.UnknownHostException;
import
java.util.ArrayList;
import
java.util.List;
import
org.bson.types.ObjectId;
import
org.junit.After;
import
org.junit.Before;
import
org.junit.Test;
import
com.mongodb.BasicDBObject;
import
com.mongodb.Bytes;
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.QueryOperators;
import
com.mongodb.util.JSON;
/**
* <b>function:</b> 实现MongoDB的Index操作
* @author hoojo
* @createDate 2011-6-2 下午03:21:23
* @file MongoDB4IndexTest.java
* @package com.hoo.test
* @project MongoDB
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
public
class
MongoDB4IndexTest {
private
Mongo mg = null;
private
DB db;
private
DBCollection users;
@Before
public
void
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"
);
}
@After
public
void
destory() {
if
(mg != null)
mg.close();
mg = null;
db = null;
users = null;
System.gc();
}
public
void
print(Object o) {
System.out.println(o);
}
}
3、 下面完成对象Collection的index的操作
/**
* <b>function:</b> 测试Collection的index相关操作
* @author hoojo
* @createDate 2012-2-16 下午08:32:26
*/
@Test
public
void
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_index
coll.ensureIndex(
new
BasicDBObject(
"address"
, 1),
new
BasicDBObject(
"name"
,
"default_index"
));
// 创建索引对象，索引名称user_index
coll.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;
/**
* <b>function:</b> JavaEntity对象
* @author hoojo
* @createDate 2011-5-31上午11:45:21
* @file User.java
* @package com.hoo.entity
* @project Morphia
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
//利用morphia的annotation进行注解
@Entity
public
class
User {
@Id
private
long
id;
private
String name;
private
boolean
sex;
private
int
age;
private
String address;
public
User() {
}
public
User(
long
id, String name,
boolean
sex,
int
age, String address) {
super
();
this
.id = id;
this
.name = name;
this
.sex = sex;
this
.age = age;
this
.address = address;
}
//getter、setter
@Override
public
String toString() {
return
this
.id +
"#"
+
this
.name +
"#"
+
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
java.net.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;
/**
* <b>function:</b> morphia对象的简单测试
* @author hoojo
* @createDate 2011-5-31上午11:30:20
* @file MorphiaTest.java
* @package com.hoo.test
* @project Morphia
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
public
class
MorphiaTest {
private
Mongo mongo;
private
Morphia morphia;
@Before
public
void
init() {
try
{
mongo =
new
Mongo();
}
catch
(UnknownHostException e) {
e.printStackTrace();
}
catch
(MongoException e) {
e.printStackTrace();
}
morphia =
new
Morphia();
}
private
void
print(Object o) {
if
(o != null) {
System.out.println(o.toString());
}
}
/**
* <b>function:</b> morphia对象的简单测试
* @author hoojo
*/
@SuppressWarnings(
"deprecation"
)
@Test
public
void
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ds
ds = 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DBObject
print(
"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
));
}
/**
* <b>function:</b> 对Mapper对象相关操作
* @author hoojo
* @createDate 2012-2-16下午10:20:38
*/
@Test
public
void
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class
for
(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))));
}
/**
* <b>function:</b> 实体缓存
* @author hoojo
*/
@Test
public
void
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());
}
@After
public
void
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
java.net.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;
/**
* <b>function:</b> Datastore增删改查操作
* @author hoojo
* @createDate 2011-5-31下午06:29:04
* @fileDatastore DatastoreTest.java
* @package com.hoo.test.ds
* @project Morphia
* @blog http://blog.csdn.net/IBM_hoojo
* @email hoojo_@126.com
* @version 1.0
*/
public
class
DatastoreTest {
private
Mongo mongo;
private
Morphia morphia;
private
Datastore ds;
@Before
public
void
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"
);
}
private
void
print(Object o) {
if
(o != null) {
System.out.println(o.toString());
}
}
/**
* <b>function:</b> 查询所有
* @author hoojo
* @createDate 2012-2-16 下午10:36:13
*/
private
void
query() {
Iterable<User> it = ds.createQuery(User.
class
).fetch();
while
(it.iterator().hasNext()) {
print(
"fetch: "
+ it.iterator().next());
}
}
@After
public
void
destory() {
mongo = null;
morphia = null;
ds = null;
System.gc();
}
}
2、 增删改CUD操作
/**
* <b>function:</b> CUD增删改
* @author hoojo
* @createDate 2012-2-16 下午10:46:08
*/
@Test
public
void
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<User> users =
new
ArrayList<User>();
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<User> 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: "
+ ds.updateFirst(ds.createQuery(User.
class
).field(
"id"
).equal(1306907246518L), user, true).getUpdatedCount());
user.setId(1306916670518L);
// 合并
print(
"merge: "
+ ds.merge(user).getId());
this
.query();
//删除
print(
"delete: "
+ ds.delete(ds.createQuery(User.
class
).field(
"id"
).equal(1306907246518L)).getN());
print(
"delete: "
+ ds.delete(ds.find(User.
class
,
"age"
, 29).get()).getN());
//print("delete: " + ds.delete(User.class, 1306911594631L).getN());
//print("delete: " + ds.delete(User.class, users).getN());
//ds.delete(ds.createQuery(User.class));
this
.query();
}
3、 Find查询操作
/**
* <b>function:</b> find查询
* @author hoojo
* @createDate 2012-2-16 下午10:45:55
*/
@Test
public
void
testFind() {
print(
"find: "
+ ds.find(User.
class
).asList());
//like
print(
"find-contains: "
+ ds.find(User.
class
).field(
"name"
).contains(
"test-1"
).asList());
//忽略大小写
print(
"find-containsIgnoreCase: "
+ ds.find(User.
class
).field(
"name"
).containsIgnoreCase(
"ja"
).asList());
print(
"find-endsWith: "
+ ds.find(User.
class
).field(
"name"
).endsWith(
"22"
).asList());
print(
"find-endsWithIgnoreCase: "
+ ds.find(User.
class
).field(
"name"
).endsWithIgnoreCase(
"CK"
).asList());
//过滤null或是没有name属性的
print(
"find-doesNotExist: "
+ ds.find(User.
class
).field(
"name"
).doesNotExist().asList());
//查询name有值的数据
print(
"find-doesNotExist: "
+ ds.find(User.
class
).field(
"name"
).exists().asList());
//age > 48
print(
"find-greaterThan: "
+ ds.find(User.
class
).field(
"age"
).greaterThan(66).asList());
//age >= 48
print(
"find-greaterThan: "
+ ds.find(User.
class
).field(
"age"
).greaterThanOrEq(66).asList());
List<Integer> ageList =
new
ArrayList<Integer>();
ageList.add(22);
ageList.add(55);
ageList.add(66);
//all
print(
"find-hasAllOf: "
+ ds.find(User.
class
).field(
"age"
).hasAllOf(ageList).asList());
//in
print(
"find-hasAnyOf: "
+ ds.find(User.
class
).field(
"age"
).hasAnyOf(ageList).asList());
//not in
print(
"find-hasNoneOf: "
+ ds.find(User.
class
).field(
"age"
).hasNoneOf(ageList).asList());
//elemMatch
//print("find-hasThisElement: " + ds.find(User.class).field("age").hasThisElement(55).asList());
print(
"find-hasThisOne: "
+ ds.find(User.
class
).field(
"age"
).hasThisOne(55).asList());
print(
"find-in: "
+ ds.find(User.
class
).field(
"age"
).in(ageList).asList());
print(
"find-lessThan: "
+ ds.find(User.
class
).field(
"age"
).lessThan(20).asList());
print(
"find-lessThanOrEq: "
+ ds.find(User.
class
).field(
"age"
).lessThanOrEq(18).asList());
//print("find-lessThanOrEq: " + ds.find(User.class).field("age").near(.2, .8).asList());
print(
"find: "
+ ds.find(User.
class
,
"id"
, 1306813979609L).get());
print(
"find: "
+ ds.find(User.
class
,
"age"
, 28, 1, 2).asList());
print(
"findAndDelete: "
+ ds.findAndDelete(ds.createQuery(User.
class
).field(
"id"
).equal(1306813979609L)));
print(
"find: "
+ ds.find(User.
class
).asList());
}
4、 Query查询操作
/**
* <b>function:</b> query查询
* @author hoojo
* @createDate 2012-2-16 下午10:40:10
*/
@Test
public
void
testQuery() {
// 查询所有
print(
"query: "
+ ds.createQuery(User.
class
).asList());
// 查询主键
print(
"query key: "
+ ds.createQuery(User.
class
).asKeyList());
// 结果集数量
print(
"query: "
+ ds.createQuery(User.
class
).countAll());
// 抓取查询所有记录
Iterable<User> it = ds.createQuery(User.
class
).fetch();
while
(it.iterator().hasNext()) {
print(
"fetch: "
+ it.iterator().next());
}
// null
it = ds.createQuery(User.
class
).fetchEmptyEntities();
while
(it.iterator().hasNext()) {
print(
"fetchEmptyEntities: "
+ it.iterator().next());
}
// all key
Iterable<Key<User>> itkeys = ds.createQuery(User.
class
).fetchKeys();
while
(itkeys.iterator().hasNext()) {
print(
"fetchKeys: "
+ itkeys.iterator().next());
}
// age > 24
print(
"query: "
+ ds.createQuery(User.
class
).filter(
"age > "
, 24).asList());
// age in (20, 28)
print(
"query: "
+ ds.createQuery(User.
class
).filter(
"age in "
, newint[] { 20, 28 }).asList());
// limit 3
print(
"query: "
+ ds.createQuery(User.
class
).limit(3).asList());
// 分页类似MySQL
print(
"query: "
+ ds.createQuery(User.
class
).offset(11).limit(5).asList());
// order排序，默认asc
print(
"query: "
+ ds.createQuery(User.
class
).order(
"age"
).asList());
//desc
print(
"query: "
+ ds.createQuery(User.
class
).order(
"-age"
).asList());
// 组合排序 order by age, name
print(
"query: "
+ ds.createQuery(User.
class
).order(
"age, name"
).asList());
print(
"query: "
+ ds.createQuery(User.
class
).queryNonPrimary().asList());
print(
"query: "
+ ds.createQuery(User.
class
).queryPrimaryOnly().asList());
//如果include 为true就表示取该属性的值，其他的默认null，反之为false则该属性为null，取其他的值
print(
"query: "
+ ds.createQuery(User.
class
).retrievedFields(false,
"age"
).asList());
}
5、 get和count查询
/**
* <b>function:</b> get查询
* @author hoojo
* @createDate 2012-2-16 下午10:39:09
*/
@Test
public
void
testGet() {
User user =
new
User();
user.setId(1306916670518L);
print(
"get: "
+ ds.get(user));
List<Long> ids =
new
ArrayList<Long>();
ids.add(1306907246519L);
ids.add(1306916670524L);
// 通过id集合查询相当于in ()
print(
"get: "
+ ds.get(User.
class
, ids).asList());
// id查询
print(
"get: "
+ ds.get(User.
class
, 1306916670524L));
}
/**
* <b>function:</b> count查询
* @author hoojo
* @createDate 2012-2-16 下午10:38:02
*/
@Test
public
void
testGetCount() {
User user =
new
User();
user.setId(1306916670518L);
print(
"getCount: "
+ ds.getCount(user));
print(
"getCount: "
+ ds.getCount(User.
class
));
List<Long> ids =
new
ArrayList<Long>();
ids.add(1306907246519L);
ids.add(1306916670524L);
print(
"getCount: "
+ ds.getCount(ds.get(User.
class
, ids)));
// age > 22的记录
print(
"getCount: "
+ ds.getCount(ds.createQuery(User.
class
).filter(
"age > "
, 22)));
// 所有
print(
"countAll: "
+ ds.get(User.
class
, ids).countAll());
print(
"countAll: "
+ ds.find(User.
class
).countAll());
}
6、 其他操作
@Test
public
void
testOthers() {
query();
/** 索引 */
ds.ensureIndexes();
// 同时用annotation也可以给指定的属性建立索引
// 只需用在JavaEntity建立索引的属性上添加annotation
/*@Indexed(value = IndexDirection.ASC, name = "address_index")
String address;
// 建立唯一索引
@Indexed(value = IndexDirection.ASC, name = "bandName", unique = true)
String name;*/
ds.ensureCaps();
User user =
new
User();
user.setId(1306916670518L);
print(
"getDB: "
+ ds.getDB());
print(
"getDefaultWriteConcern: "
+ ds.getDefaultWriteConcern());
print(
"DBColl: "
+ ds.getCollection(User.
class
));
// 查询User对象对应的集合
Key<User> key = ds.getKey(user);
// 主键
print(
"getKey: "
+ key);
print(
"exists: "
+ ds.exists(user));
//是否存在该对象
print(
"exists: "
+ ds.exists(ds.getKey(user)));
print(
"getByKey: "
+ ds.getByKey(User.
class
, key));
List<Key<User>> keys =
new
ArrayList<Key<User>>();
keys.add(key);
user.setId(1306916670521L);
keys.add(ds.getKey(user));
print(
"getByKey: "
+ ds.getByKeys(keys));
print(
"getByKey: "
+ ds.getByKeys(User.
class
, keys));
query();
}
用Morphia操作对象相对比较简单，它对MongoDB对Java的操作进行了一些封装，特别是查询这方面的。有没有感觉像是在用Hibernate？
作者：
hoojo
出处：
http://www.cnblogs.com/hoojo/archive/2012/02/17/2355384.html
blog：
http://blog.csdn.net/IBM_hoojo
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
版权所有，转载请注明出处 本文出自： http://www.cnblogs.com/hoojo/archive/2012/02/17/2355384.html
版权所有，欢迎转载，转载请注明出处，谢谢
JavaEE
EJB、JDBC、JDO、RMI、JPA、JTA、JMS、 JCA、 JNDI 等等
