MongoDB在java上的应用

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1. 创建链接

package com.show.service;import java.net.UnknownHostException;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;import com.mongodb.Mongo;import com.mongodb.util.JSON;public class DBConnect {protected Mongo mongo;public Mongo getMongo() {return mongo;}public void setMongo(Mongo mongo) {this.mongo = mongo;}public DBConnect(String hostName, Integer port) {try {mongo = new Mongo(hostName, port);} catch (UnknownHostException e) {e.printStackTrace();}}}

2. CURD

package com.show.service;import java.util.List;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.DBCollection;import com.mongodb.DBCursor;import com.mongodb.DBObject;public class DBManager extends DBConnect {/** * DBManager的构造函数 初始化db、collectionName * @param hostName 父类的构造函数的参数 主机名 * @param port 父类的构造函数的参数 端口 * @param DBName 数据库名称 * @param collectionName 集合名称 */public DBManager(String hostName, Integer port,String DBName,String collectionName){super(hostName, port);setDb(mongo.getDB(DBName));setCollectionName(collectionName);}private DB db;private String collectionName;public DB getDb() {return db;}public void setDb(DB db) {this.db = db;}public String getCollectionName() {return collectionName;}public void setCollectionName(String collectionName) {this.collectionName = collectionName;}/** * 获取所有数据 * @return List<DBObject> DBObject的集合 */public List<DBObject> getList() {DBObject filter = new BasicDBObject("_id",0);DBCollection collection = db.getCollection(getCollectionName());DBCursor cur = collection.find(null,filter).sort(new BasicDBObject("time",1));return cur.toArray();}/** * 根据状态查询数据 * @param status PASS/ERROR/ABORT * @return List<DBObject> DBObject的集合 */public List<DBObject> getListByStatus(String status){DBObject find = new BasicDBObject("status",status);DBObject filter = new BasicDBObject("_id",0);DBCollection collection = db.getCollection(getCollectionName());DBCursor cur = collection.find(find,filter).sort(new BasicDBObject("time",1));return cur.toArray();}/** * 根据模块名查询数据 * @param moduleName * @return List<DBObject> DBObject的集合 */public List<DBObject> getListByModuleName(String moduleName){DBObject find = new BasicDBObject("module",moduleName);DBObject filter = new BasicDBObject("_id",0);DBCollection collection = db.getCollection(getCollectionName());DBCursor cur = collection.find(find,filter).sort(new BasicDBObject("time",1));return cur.toArray();}/** * 增加数据 * @return Internet 添加的条目数 */public int insertOne(DBObject data) {DBCollection collection = db.getCollection(getCollectionName());    return collection.insert(data).getN();}/** * 获取某键的值的不重复集合 * @return List<String> 键key的值的集合 */public List<String> getModuleList(){DBCollection collection = db.getCollection(getCollectionName());List<String> list= collection.distinct("module");return list;}/** * 删除所有数据 * @return Internet 删除的条目数 */public int removeAllTest(){DBCollection collection = db.getCollection(getCollectionName());return collection.remove(new BasicDBObject()).getN();}}

与MongoDB自带的find、remove、insert的参数类似，只是将“{}”换成了DBObject，省去了回调函数。

其余的如count()、sort()、distinct()等接口与MongoDB中类似

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