Java操作mongoDB2.6的常见API用法
时间：2014-05-18 07:51:40
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对于mongoDB而言，学习方式和学习关系型数据库差不太多
开始都是学习如何insert、find、update、remove，然后就是分页、排序、索引，再接着就是主从复制、副本集、分片等等
最后就是通过它提供的各个驱动（比如Java、PHP、node.js等等）来练习所谓的高级用法
另外：相对于Oracle有PLSQL Developer，MySQL有HeidiSQL
mongoDB也不例外，它的图形化工具中有一款叫做mongoVUE的，我用的是1.5.3破解版（不是每15天就得改一次注册表的那种）
下面演示的就是以Java为例，常见的操作mongoDB API用法
package com.jadyer.test;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import org.bson.types.ObjectId;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;
import com.mongodb.util.JSON;
/**
* mongoDB的Java驱动测试
* @see ----------------------------------------------------------------------------------------
* @see 配置
* @see 1)下载https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-2.6.1.zip
* @see 2)解压到本地硬盘D:\Develop\mongoDB\中,并配置环境变量path=D:\Develop\mongoDB\bin
* @see 然后在CMD下执行此命令验证安装成功与否>mongod --version
* @see 3)建立D:\Develop\mongoDBData\文件夹,用于存放mongoDB数据文件
* @see 4)自定义bat文件,分别用于启动mongoDB数据库和连接数据库的客户端
* @see 启动客户端的mongo_client.bat内容为-->mongo 127.0.0.1:27017/admin
* @see 启动数据库的mongo_db.bat内容为------>mongod --dbpath D:\Develop\mongoDBData --rest
* @see 注:加入[--rest]参数是为了能够访问mongoDB的Web控制台http://127.0.0.1:28017/
* @see ----------------------------------------------------------------------------------------
* @see Java驱动
* @see 这里要用到mongoDB的Java驱动包,下载地址http://docs.mongodb.org/ecosystem/drivers/java/
* @see ----------------------------------------------------------------------------------------
* @create May 15, 2014 10:17:30 PM
* @author 玄玉<http://blog.csdn.net/jadyer>
*/
public class MongoDBTest {
private static MongoClient mongoClient;
private static DB db;
/**
* 建立数据库连接
*/
@BeforeClass
public static void globalInit(){
try {
//mongoClient = new MongoClient(Arrays.asList(new ServerAddress("127.0.0.1", 27017), new ServerAddress("127.0.0.1", 27018), new ServerAddress("127.0.0.1", 27019)));
mongoClient = new MongoClient("127.0.0.1", 27017);
} catch (UnknownHostException e) {
System.err.println("mongoDB主机地址有误");
}
db = mongoClient.getDB("mydemo");
}
/**
* 销毁数据库连接
*/
@AfterClass
public static void globalDestroy(){
mongoClient.close();
}
/**
* 获取数据库信息
*/
@Test
public void getMetaData(){
//查询数据库中所有的集合名称
for(String collectionName : db.getCollectionNames()){
System.out.println("mydemo数据库所拥有的集合为:[" + collectionName + "]");
}
//查询某一集合中的数据
DBCollection collection = db.getCollection("person");
DBCursor cursor = collection.find();
try{
while(cursor.hasNext()){
System.out.println("person集合所拥有的name为--[" + cursor.next().get("name") + "]");
}
}finally{
cursor.close();
}
System.out.println("person集合中的记录数为----------->" + cursor.count());
System.out.println("person集合数据格式化后的JSON串为-->" + JSON.serialize(cursor));
}
/**
* 创建一个空的"moive"集合
*/
@Test
public void createCollection(){
db.createCollection("movie", new BasicDBObject());
}
/**
* 为"moive"集合添加文档
*/
@Test
public void insertDocument(){
DBObject doc = new BasicDBObject();
doc.put("name", "24");
doc.put("season", "ninth");
doc.put("score", 88);
List<String> actorList = new ArrayList<String>();
actorList.add("Jack Bauer");
actorList.add("Counter Terrorist Unit");
doc.put("actor", actorList);
db.getCollection("movie").insert(doc);
}
/**
* 批量插入文档
*/
@Test
public void insertBatchDocument(){
List<DBObject> docList = new ArrayList<DBObject>();
DBObject doc11 = new BasicDBObject("name", "Prison Break").append("season", "fourth").append("score", 99);
DBObject doc22 = new BasicDBObject("name", "Game of Thrones").append("season", "third").append("score", 92);
docList.add(doc11);
docList.add(doc22);
db.getCollection("movie").insert(docList);
}
/**
* 根据_id删除数据
*/
@Test
public void deleteById(){
WriteResult result = db.getCollection("movie").remove(new BasicDBObject("_id", new ObjectId("5374c6dc5030e0ea4dac8907")));
System.out.println("本次操作影响的记录条数为:" + result.getN());
}
/**
* 根据条件删除数据
*/
@Test
public void deleteByData(){
DBObject doc = new BasicDBObject();
doc.put("name", "Prison Break");
WriteResult result = db.getCollection("movie").remove(doc);
System.out.println("本次操作影响的记录条数为:" + result.getN());
}
/**
* 更新数据
* @see 增加email属性
*/
@Test
public void update(){
DBObject doc = new BasicDBObject();
doc.put("$set", new BasicDBObject("email", "Jadyer@yeah.net"));
WriteResult result = db.getCollection("movie").update(new BasicDBObject(), doc, false, true);
System.out.println("本次操作影响的记录条数为:" + result.getN());
}
/**
* 查询"moive"集合中的key
*/
@Test
public void getKey(){
DBObject keys = new BasicDBObject();
keys.put("_id", false);
keys.put("name", true);
//keys.put("score", true);
//第一个参数表示查询条件,第二个参数表示返回的具体key
DBCursor cursor = db.getCollection("movie").find(null, keys);
try{
while(cursor.hasNext()){
DBObject object = cursor.next();
System.out.println("查询到的name=" + object.get("name") + ", score=" + object.get("score"));
}
}finally{
cursor.close();
}
}
/**
* 查询"moive"集合中分数不超过95的key
*/
@Test
public void getKeyUseScore(){
DBObject ref = new BasicDBObject();
ref.put("score", new BasicDBObject("$lte", 95));
DBCursor cursor = db.getCollection("movie").find(ref, null);
try{
while(cursor.hasNext()){
DBObject object = cursor.next();
System.out.println("查询到的name=" + object.get("name") + ", score=" + object.get("score"));
}
}finally{
cursor.close();
}
}
/**
* 分页查询
*/
@Test
public void limitSkip(){
DBCursor cursor = db.getCollection("movie").find(null, null);
cursor.limit(0).skip(1);
try{
while(cursor.hasNext()){
DBObject object = cursor.next();
System.out.println("查询到的name=" + object.get("name"));
}
}finally{
cursor.close();
}
}
}
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