java对mongoDB的基本操作

package com.mongodb.text;import java.net.UnknownHostException;import java.util.List;import org.bson.types.ObjectId;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.MongoException;public class MongoDb {//1.建立一个Mongo的数据库连接对象static Mongo connection = null;//2.创建相关数据库的连接static DB db = null;public MongoDb(String dbName) throws UnknownHostException, MongoException{connection = new Mongo("127.0.0.1:27017");db = connection.getDB(dbName);}public static void main(String[] args) throws UnknownHostException, MongoException {//实例化MongoDb mongoDb = new MongoDb("foobar");    /**     * 1.创建一个名字叫javadb的数据库     *///mongoDb.createCollection("javadb");/** * 2.为集合javadb添加一条数据 *///DBObject dbs = new BasicDBObject();//dbs.put("name", "uspcat.com");//dbs.put("age", 2);//List<String>  books = new ArrayList<String>();//books.add("EXTJS");//books.add("MONGODB");//dbs.put("books", books);//mongoDb.insert(dbs, "javadb");/** * 3.批量插入数据 *///List<DBObject> dbObjects = new ArrayList<DBObject>();//DBObject jim = new BasicDBObject("name","jim");//DBObject lisi = new BasicDBObject("name","lisi");//dbObjects.add(jim);//dbObjects.add(lisi);//mongoDb.insertBatch(dbObjects, "javadb");/** * 4.根据ID删除数据 *///mongoDb.deleteById("502870dab9c368bf5b151a04", "javadb");/** * 5.根据条件删除数据 *///DBObject lisi = new BasicDBObject();//lisi.put("name", "lisi");//int count = mongoDb.deleteByDbs(lisi, "javadb");//System.out.println("删除数据的条数是: "+count);/** * 6.更新操作,为集合增加email属性 *///DBObject update = new BasicDBObject();//update.put("$set", //new BasicDBObject("eamil","[e-mail]"));//mongoDb.update(new BasicDBObject(),//update,false,true,"javadb");/** * 7.查询出persons集合中的name和age *///DBObject keys = new BasicDBObject();//keys.put("_id", false);//keys.put("name", true);//keys.put("age", true);//DBCursor cursor = mongoDb.find(null, keys, "persons");//    while (cursor.hasNext()) {//    DBObject object = cursor.next();//    System.out.println(object.get("name"));//    }    /**     * 7.查询出年龄大于26岁并且英语成绩小于80分     *///DBObject ref = new BasicDBObject();//ref.put("age", new BasicDBObject("$gte",26));//ref.put("e", new BasicDBObject("$lte",80));//DBCursor cursor = mongoDb.find(ref, null, "persons");//    while (cursor.hasNext()) {//    DBObject object = cursor.next();//    System.out.print(object.get("name")+"-->");//    System.out.print(object.get("age")+"-->");//    System.out.println(object.get("e"));//    }/** * 8.分页例子 */DBCursor cursor = mongoDb.find(null, null, 0, 3, "persons");    while (cursor.hasNext()) {    DBObject object = cursor.next();    System.out.print(object.get("name")+"-->");    System.out.print(object.get("age")+"-->");    System.out.println(object.get("e"));    }//关闭连接对象connection.close();}/** * 穿件一个数据库集合 * @param collName 集合名称 * @param db  数据库实例 */public void createCollection(String collName){DBObject dbs = new BasicDBObject();db.createCollection("javadb", dbs);}/** * 为相应的集合添加数据 * @param dbs * @param collName */public void insert(DBObject dbs,String collName){//1.得到集合DBCollection coll = db.getCollection(collName);//2.插入操作coll.insert(dbs);}/** * 为集合批量插入数据 * @param dbses * @param collName */public void insertBatch(List<DBObject> dbses,String collName){//1.得到集合DBCollection coll = db.getCollection(collName);//2.插入操作coll.insert(dbses);}/** * 根据id删除数据 * @param id * @param collName * @return 返回影响的数据条数 */public int deleteById(String id,String collName){//1.得到集合DBCollection coll = db.getCollection(collName);DBObject dbs = new BasicDBObject("_id", new ObjectId(id));int count = coll.remove(dbs).getN();return count;}/** * 根据条件删除数据 * @param id * @param collName * @return 返回影响的数据条数 */public int deleteByDbs(DBObject dbs,String collName){//1.得到集合DBCollection coll = db.getCollection(collName);int count = coll.remove(dbs).getN();return count;}/** * 更新数据 * @param find 查询器 * @param update 更新器 * @param upsert 更新或插入 * @param multi 是否批量更新 * @param collName 集合名称 * @return 返回影响的数据条数 */public int update(DBObject find,DBObject update,boolean upsert,boolean multi,String collName){//1.得到集合DBCollection coll = db.getCollection(collName);int count = coll.update(find, update, upsert, multi).getN();return count;}/** * 查询器(分页) * @param ref * @param keys * @param start * @param limit * @return */public DBCursor find(DBObject ref, DBObject keys,int start,int limit,String collName){DBCursor cur = find(ref, keys, collName);return cur.limit(limit).skip(start);}/** * 查询器(不分页) * @param ref * @param keys * @param start * @param limit * @param collName * @return */public DBCursor find(DBObject ref,DBObject keys,String collName){//1.得到集合DBCollection coll = db.getCollection(collName);DBCursor cur = coll.find(ref, keys);return cur;}}