mongodb增删改查
闲着没事干，自己用了下mongodb 写了点 mongodb的增删改查 代码如此啊 有注解，自己看吧
package com.xiaochen.test;import com.mongodb.*;import com.mongodb.util.JSON;import org.bson.types.ObjectId;import org.junit.After;import org.junit.Before;import org.junit.Test;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class MongoDB4CRUDTest { private Mongo mg = null; private DB db; private DBCollection users; @Before public void init() { try { mg = new Mongo("localhost", 27017); //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("TEST_CRUD"); //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); } private void queryAll() { print("查询users的所有数据："); //db游标 DBCursor cur = users.find(); while (cur.hasNext()) { print(cur.next()); } } @Test public void add() { //先查询所有数据 queryAll(); print("count: " + users.count()); DBObject user = new BasicDBObject(); user.put("name", "hoojo"); user.put("age", 24); //users.save(user)保存，getN()获取影响行数 //print(users.save(user).getN()); //扩展字段，随意添加字段，不影响现有数据 user.put("sex", "男");// print(users.insert(user)); //添加多条数据，传递Array对象 print(users.insert(user, new BasicDBObject("name", "tom"))); //添加List集合 List<DBObject> list = new ArrayList<>(); list.add(user); DBObject user2 = new BasicDBObject("name", "lucy"); user.put("age", 22); list.add(user2); //添加List集合 print(users.insert(list)); //查询下数据，看看是否添加成功 print("count: " + users.count()); queryAll(); } @Test public void remove() { queryAll(); print("删除id = 4de73f7acd812d61b4626a77：" + users.remove(new BasicDBObject("_id", new ObjectId("525abdbbb0c683cf578095ef"))).getN()); print("remove age >= 24: " + users.remove(new BasicDBObject("age", new BasicDBObject("$gte", 24))).getN()); } @Test public void modify() { print("修改：" + users.update(new BasicDBObject("_id", new ObjectId("525abdceb0c6510d21f5b429")), new BasicDBObject("age", 99)).getN()); Map<String, Object> map = new HashMap<String, Object>(); map.put("age", 9999); map.put("name", "liuxiaochen"); map.put("class", "software"); print("修改：" + users.update( new BasicDBObject("_id", new ObjectId("525abdceb0c6510d21f5b429")), new BasicDBObject(map), true,//如果数据库不存在，是否添加 false//多条修改 ).getN()); print("修改：" + users.update( new BasicDBObject("name", "haha"), new BasicDBObject("name", "dingding"), true,//如果数据库不存在，是否添加 true//false只修改第一天，true如果有多条就不修改 ).getN()); //当数据库不存在就不修改、不添加数据，当多条数据就不修改 //print("修改多条：" + coll.updateMulti(new BasicDBObject("_id", new ObjectId("4dde23616be7c19df07db42c")), new BasicDBObject("name", "199"))); } @Test public void query() { //查询所有 //queryAll(); //查询id = 4de73f7acd812d61b4626a77 print("find id = 4de73f7acd812d61b4626a77: " + users.find(new BasicDBObject("_id", new ObjectId("4de73f7acd812d61b4626a77"))).toArray()); //查询age = 24 print("find age = 24: " + users.find(new BasicDBObject("age", 24)).toArray()); //查询age >= 24 print("find age >= 24: " + users.find(new BasicDBObject("age", new BasicDBObject("$gte", 24))).toArray()); print("find age <= 24: " + users.find(new BasicDBObject("age", new BasicDBObject("$lte", 24))).toArray()); print("查询age!=25：" + users.find(new BasicDBObject("age", new BasicDBObject("$ne", 25))).toArray()); print("查询age in 25/26/27：" + users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.IN, new int[]{25, 26, 27}))).toArray()); print("查询age not in 25/26/27：" + users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.NIN, new int[]{25, 26, 27}))).toArray()); print("查询age exists 排序：" + users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.EXISTS, true))).toArray()); print("只查询age属性：" + users.find(null, new BasicDBObject("age", true)).toArray()); print("只查属性：" + users.find(null, new BasicDBObject("age", true), 0, 2).toArray()); print("只查属性：" + users.find(null, new BasicDBObject("age", true), 0, 2, Bytes.QUERYOPTION_NOTIMEOUT).toArray()); //只查询一条数据，多条去第一条 print("findOne: " + users.findOne()); print("findOne: " + users.findOne(new BasicDBObject("age", 26))); print("findOne: " + users.findOne(new BasicDBObject("age", 26), new BasicDBObject("name", true))); //查询修改、删除 print("findAndRemove 查询age=25的数据，并且删除: " + users.findAndRemove(new BasicDBObject("age", 25))); //查询age=26的数据，并且修改name的值为Abc print("findAndModify: " + users.findAndModify(new BasicDBObject("age", 26), new BasicDBObject("name", "Abc"))); print("findAndModify: " + users.findAndModify( new BasicDBObject("age", 28), //查询age=28的数据 new BasicDBObject("name", true), //查询name属性 new BasicDBObject("age", true), //按照age排序 false, //是否删除，true表示删除 new BasicDBObject("name", "Abc"), //修改的值，将name修改成Abc true, true)); queryAll(); } @Test public void testOthers() { DBObject user = new BasicDBObject(); user.put("name", "hoojo"); user.put("age", 24); //JSON 对象转换 print("serialize: " + JSON.serialize(user)); //反序列化 print("parse: " + JSON.parse("{ \"name\" : \"hoojo\" , \"age\" : 24}")); print("判断temp Collection是否存在: " + db.collectionExists("temp")); //如果不存在就创建 if (!db.collectionExists("temp")) { DBObject options = new BasicDBObject(); options.put("size", 20); options.put("capped", 20); options.put("max", 20); print(db.createCollection("account", options)); } //设置db为只读 db.setReadOnly(true); //只读不能写入数据 db.getCollection("test").save(user); }}