MongoDB之Java测试代码（DAO层）
dao
java
mongodb
代码
测试
MongoInit.java是数据库初始化及连接类 MongoUtils.java是对mongodb的各种操作方法 MongoInit.java package com.wlwcloud.datatest;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.net.UnknownHostException;i
MongoInit.java是数据库初始化及连接类
MongoUtils.java是对mongodb的各种操作方法
MongoInit.java
package com.wlwcloud.datatest;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.UnknownHostException;
import java.util.Properties;
import org.apache.log4j.Logger;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.Mongo;
import com.mongodb.MongoOptions;
import com.mongodb.ServerAddress;
/**
* Mongo工具类:设计为单例模式，每当月份发生变化，数据库连接名称就会发生变化，这是业务规则 因MongoDB的Java驱动是线程安全的，对于一般的应用，只要一个Mongo实例即可，Mongo有个内置的连接池（池大小默认为10个）。
* 对于有大量写和读的环境中，为了确保在一个Session中使用同一个DB时，我们可以用以下方式保证一致性： DB mdb =mongo.getDB('dbname'); mdb.requestStart(); // 业务代码 mdb.requestDone();
* DB和DBCollection是绝对线程安全的
* @author undoner
*/
public class MongoInit {
/** DB监听端口号 */
private static int DBPort = 27017;
/** DB连接URL */
private static String DBUrl = "localhost";
/** 连接DB库名称 */
private static String DBName = "wlwdb";
static Logger log = Logger.getRootLogger();
private static Mongo mongo;
private static DBCollection coll;
private static DB db;
static {
try {
DBproperties();
MongoOptions options = new MongoOptions();
options.autoConnectRetry = true;
options.connectionsPerHost = 1000;
options.maxWaitTime = 5000;
options.socketTimeout = 0;
options.connectTimeout = 15000;
options.threadsAllowedToBlockForConnectionMultiplier = 5000;
// 事实上，Mongo实例代表了一个数据库连接池，即使在多线程的环境中，一个Mongo实例对我们来说已经足够了
ServerAddress serverAddress = new ServerAddress(DBUrl, DBPort);
mongo = new Mongo(serverAddress, options);
} catch (UnknownHostException e) {
log.info("get mongo instance failed");
}
}
static void DBproperties() {
// 读取配置文件config.properties中的属性值
String myFilePath = MongoInit.class.getResource("/").getPath() + "MongoDBConfig.properties";
Properties properties = new Properties();
FileInputStream fileInputStream = null;
try {
fileInputStream = new FileInputStream(myFilePath);
properties.load(fileInputStream);
DBPort = Integer.parseInt((String) properties.getProperty("DBPort"));
DBUrl = (String) properties.getProperty("DBUrl");
DBName = (String) properties.getProperty("DBName");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
fileInputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public static DB getDB() {
if (db == null) {
db = mongo.getDB(DBName);
}
return db;
}
public static Mongo getMong() {
return mongo;
}
public static DBCollection getColl(String collname) {
return getDB().getCollection(collname);
}
}登录后复制
package com.wlwcloud.datatest;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.ketayao.ketacustom.entity.main.User;
import com.ketayao.utils.SecurityUtils;
import com.mongodb.AggregationOutput;
import com.mongodb.BasicDBList;
import com.mongodb.BasicDBObject;
import com.mongodb.BasicDBObjectBuilder;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
import com.mongodb.MapReduceCommand;
import com.mongodb.MapReduceOutput;
import com.mongodb.Mongo;
import com.mongodb.MongoException;
import com.mongodb.QueryBuilder;
import com.mongodb.WriteConcern;
public class MongoUtils {
//DBCursor cursor = coll.find(condition).addOption(Bytes.QUERYOPTION_NOTIMEOUT);//设置游标不要超时
/**
* 获取所有数据库实例
*/
public void testGetDBS() {
List<String> dbnames = MongoInit.getMong().getDatabaseNames();
for (String dbname : dbnames) {
System.out.println("dbname:" + dbname);
}
}
/**
* 删除数据库
*/
public void dropDatabase(String dbname) {
MongoInit.getMong().dropDatabase(dbname);
}
/**
* 查询所有表名
*/
public void getAllCollections() {
Set<String> colls = MongoInit.getDB().getCollectionNames();
for (String s : colls) {
System.out.println("Collections:"+s);
}
}
/**
* 删除一个表
*/
public void dropCollection(String collection) {
MongoInit.getColl(collection).drop();
}
/**
* 添加一条记录
*/
public void addData(String dbCollection,String dataID,String dataTime,String dataContent,String dataStatus) {
DBCollection coll = MongoInit.getColl(dbCollection);
BasicDBObject doc = new BasicDBObject();
doc.put("id", dataID);
doc.put("time", dataTime);
doc.put("data", dataContent);
doc.put("status", dataStatus);
coll.insert(doc);
// 设定write concern，以便操作失败时得到提示
coll.setWriteConcern(WriteConcern.SAFE);
findOne(dbCollection);
}
/**
* 创建索引
*/
public void createIndex(String collection) {
MongoInit.getColl(collection).createIndex(new BasicDBObject("index_id", 1));
}
/**
* 获取索引信息
*/
public void getIndexInfo(String dbCollection) {
List<DBObject> list = MongoInit.getColl(dbCollection).getIndexInfo();
for (DBObject o : list) {
System.out.println(o);
}
}
/**
* 添加多条记录
*/
public void addMultiData() {
for (int i = 0; i < 100; i++) {
MongoInit.getColl("wujintao").insert(
new BasicDBObject().append("i", i));
}
List<DBObject> docs = new ArrayList<DBObject>();
for (int i = 0; i < 50; i++) {
docs.add(new BasicDBObject().append("i", i));
}
MongoInit.getColl("wujintao").insert(docs);
// 设定write concern，以便操作失败时得到提示
MongoInit.getColl("wujintao").setWriteConcern(WriteConcern.SAFE);
}
/**
* 查找第一条记录
*/
public void findOne(String dbCollection) {
DBObject myDoc = MongoInit.getColl(dbCollection).findOne();
System.out.println(myDoc);
}
/**
* 获取表中所有记录条数
*/
public void count(String dbCollection) {
System.out.println(MongoInit.getColl(dbCollection).getCount());
System.out.println(MongoInit.getColl(dbCollection).count());
}
/**
* 获取查询结果集的记录数
*/
public void getCount(String dbCollection,String dataID) {
DBObject query = new BasicDBObject("id", dataID);
long count = MongoInit.getColl(dbCollection).count(query);
System.out.println(count);
}
/**
* 查询所有结果
*/
public void getAllDocuments(String dbCollection) {
DBCursor cursor = MongoInit.getColl(dbCollection).find();
try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}
}
/**
* 按照一个条件查询
*/
public void queryByConditionOne() {
BasicDBObject query = new BasicDBObject();
query.put("name", "MongoDB");
DBCursor cursor = MongoInit.getColl("wujintao").find(query);
try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}
}
public List<SensorData> queryById(String id) {
User user = SecurityUtils.getLoginUser();
BasicDBObject query = new BasicDBObject();
System.out.print(id);
query.put("id", id);
String table="table_";
DBCursor cursor = MongoInit.getColl("table_"+user.getUsername()).find(query);
List<DBObject> list=cursor.toArray();
System.out.println(list.size());
System.out.println("dao.."+list.toString());
List<SensorData> sensordata=new ArrayList<SensorData>();
for(int i=1;i<list.size();i++)
{
String sid=(String)list.get(i).get("id");
String stime=(String)list.get(i).get("time");
String sdata=(String)list.get(i).get("data");
String status=(String)list.get(i).get("status");
String sstatus;
if(status.equals("0"))sstatus="正常";
else if(status.equals("1")) sstatus="删除";
else sstatus="未知状态";
SensorData a=new SensorData(sid,stime,sdata,sstatus);
//System.out.print(a.getData()+a.getId()+a.getStatus()+a.getTime());
sensordata.add(a);
}
return sensordata;
/* try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
} */
}
/**
* AND多条件查询,区间查询
*/
public void queryMulti() {
BasicDBObject query = new BasicDBObject();
// 查询j不等于3,k大于10的结果集
query.put("j", new BasicDBObject("$ne", 3));
query.put("k", new BasicDBObject("$gt", 10));
DBCursor cursor = MongoInit.getColl("wujintao").find(query);
try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}
}
/**
* 区间查询
* select * from table where i >50
*/
public void queryMulti2() {
BasicDBObject query = new BasicDBObject();
query = new BasicDBObject();
query.put("i", new BasicDBObject("$gt", 50)); // e.g. find all where i >
DBCursor cursor = MongoInit.getColl("wujintao").find(query);
try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}
}
/**
* 区间查询
* select * from table where 20 < i <= 30
//比较符
//"$gt"： 大于
//"$gte"：大于等于
//"$lt"： 小于
//"$lte"：小于等于
//"$in"： 包含
*/
public void queryMulti3() {
BasicDBObject query = new BasicDBObject();
query = new BasicDBObject();
query.put("i", new BasicDBObject("$gt", 20).append("$lte", 30));
DBCursor cursor = MongoInit.getColl("wujintao").find(query);
try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}
}
/**
* 组合in和and select * from test_Table where (a=5 or b=6) and (c=5 or d = 6)
*/
public void queryMulti4() {
BasicDBObject query11 = new BasicDBObject();
query11.put("a", 1);
BasicDBObject query12 = new BasicDBObject();
query12.put("b", 2);
List<BasicDBObject> orQueryList1 = new ArrayList<BasicDBObject>();
orQueryList1.add(query11);
orQueryList1.add(query12);
BasicDBObject orQuery1 = new BasicDBObject("$or", orQueryList1);
BasicDBObject query21 = new BasicDBObject();
query21.put("c", 5);
BasicDBObject query22 = new BasicDBObject();
query22.put("d", 6);
List<BasicDBObject> orQueryList2 = new ArrayList<BasicDBObject>();
orQueryList2.add(query21);
orQueryList2.add(query22);
BasicDBObject orQuery2 = new BasicDBObject("$or", orQueryList2);
List<BasicDBObject> orQueryCombinationList = new ArrayList<BasicDBObject>();
orQueryCombinationList.add(orQuery1);
orQueryCombinationList.add(orQuery2);
BasicDBObject finalQuery = new BasicDBObject("$and",
orQueryCombinationList);
DBCursor cursor = MongoInit.getColl("wujintao").find(finalQuery);
}
/**
* IN查询
* if i need to query name in (a,b); just use { name : { $in : ['a', 'b'] } }
* select * from things where name='a' or name='b'
* @param coll
*/
public void queryIn() {
BasicDBList values = new BasicDBList();
values.add("a");
values.add("b");
BasicDBObject in = new BasicDBObject("$in", values);
DBCursor cursor = MongoInit.getColl("wujintao").find(
new BasicDBObject("name", in));
try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}
}
/**
* 或查询
* select * from table where name = '12' or title = 'p'
* @param coll
*/
public void queryOr() {
QueryBuilder query = new QueryBuilder();
query.or(new BasicDBObject("name", 12), new BasicDBObject("title", "p"));
DBCursor cursor = MongoInit.getColl("wujintao").find(query.get()).addSpecial("$returnKey", "");
try {
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}
}
public void customQueryField() throws UnknownHostException{
Mongo mongo = new Mongo("localhost", 27017);
DB db = mongo.getDB("zhongsou_ad");
BasicDBObjectBuilder bulder = new BasicDBObjectBuilder();
bulder.add("times",1);
bulder.add("aid",1);
DBCursor cusor = db.getCollection("ad_union_ad_c_1").find(new BasicDBObject(),bulder.get());
for (DBObject dbObject : cusor) {
System.out.println(dbObject);
}
}
public void mapReduce() throws UnknownHostException{
Mongo mongo = new Mongo("localhost", 27017);
DB db = mongo.getDB("zhongsou_ad");
/***
* book1 = {name : "Understanding JAVA", pages : 100}
* book2 = {name : "Understanding JSON", pages : 200}
* db.books.save(book1)
* db.books.save(book2)
* book = {name : "Understanding XML", pages : 300}
* db.books.save(book)
* book = {name : "Understanding Web Services", pages : 400}
* db.books.save(book)
* book = {name : "Understanding Axis2", pages : 150}
* db.books.save(book)
*
var map = function() {
var category;
if ( this.pages >= 250 )
category = 'Big Books';
else
category = "Small Books";
emit(category, {name: this.name});
};
var reduce = function(key, values) {
var sum = 0;
values.forEach(function(doc) {
sum += 1;
});
return {books: sum};
};
var count = db.books.mapReduce(map, reduce, {out: "book_results"});
*/
try {
DBCollection books = db.getCollection("books");
BasicDBObject book = new BasicDBObject();
book.put("name", "Understanding JAVA");
book.put("pages", 100);
books.insert(book);
book = new BasicDBObject();
book.put("name", "Understanding JSON");
book.put("pages", 200);
books.insert(book);
book = new BasicDBObject();
book.put("name", "Understanding XML");
book.put("pages", 300);
books.insert(book);
book = new BasicDBObject();
book.put("name", "Understanding Web Services");
book.put("pages", 400);
books.insert(book);
book = new BasicDBObject();
book.put("name", "Understanding Axis2");
book.put("pages", 150);
books.insert(book);
String map = "function() { "+
"var category; " +
"if ( this.pages >= 250 ) "+
"category = 'Big Books'; " +
"else " +
"category = 'Small Books'; "+
"emit(category, {name: this.name});}";
String reduce = "function(key, values) { " +
"var sum = 0; " +
"values.forEach(function(doc) { " +
"sum += 1; "+
"}); " +
"return {books: sum};} ";
MapReduceCommand cmd = new MapReduceCommand(books, map, reduce,
null, MapReduceCommand.OutputType.INLINE, null);
MapReduceOutput out = books.mapReduce(cmd);
for (DBObject o : out.results()) {
System.out.println(o.toString());
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void GroupByManyField() throws UnknownHostException{
//此方法没有运行成功
Mongo mongo = new Mongo("localhost", 27017);
DB db = mongo.getDB("libary");
DBCollection books = db.getCollection("books");
BasicDBObject groupKeys = new BasicDBObject();
groupKeys.put("total", new BasicDBObject("$sum","pages"));
BasicDBObject condition = new BasicDBObject();
condition.append("pages", new BasicDBObject().put("$gt", 0));
String reduce = "function(key, values) { " +
"var sum = 0; " +
"values.forEach(function(doc) { " +
"sum += 1; "+
"}); " +
"return {books: sum};} ";
/**
BasicDBList basicDBList = (BasicDBList)db.getCollection("mongodb中集合编码或者编码")
.group(DBObject key, --分组字段，即group by的字段
DBObject cond, --查询中where条件
DBObject initial, --初始化各字段的值
String reduce, --每个分组都需要执行的Function
String finial --终结Funciton对结果进行最终的处理
*/
DBObject obj = books.group(groupKeys, condition, new BasicDBObject(), reduce);
System.out.println(obj);
AggregationOutput ouput = books.aggregate(new BasicDBObject("$group",groupKeys));
System.out.println(ouput.getCommandResult());
System.out.println(books.find(new BasicDBObject("$group",groupKeys)));
}
/**
* 分页查询
*/
public void pageQuery() {
DBCursor cursor = MongoInit.getColl("wujintao").find().skip(0)
.limit(10);
while (cursor.hasNext()) {
System.out.println(cursor.next());
}
}
/**
* 模糊查询
*/
public void likeQuery() {
Pattern john = Pattern.compile("joh?n");
BasicDBObject query = new BasicDBObject("name", john);
// finds all people with "name" matching /joh?n/i
DBCursor cursor = MongoInit.getColl("wujintao").find(query);
}
/**
* 条件删除
*/
public void delete(String dbCollection,String dataID) {
BasicDBObject query = new BasicDBObject();
query.put("id", dataID);
// 找到并且删除，并返回删除的对象
DBObject removeObj = MongoInit.getColl(dbCollection).findAndRemove(query);
System.out.println(removeObj);
}
/**
* 更新
*/
public void update() {
BasicDBObject query = new BasicDBObject();
query.put("name", "liu");
DBObject stuFound = MongoInit.getColl("wujintao").findOne(query);
stuFound.put("name", stuFound.get("name") + "update_1");
MongoInit.getColl("wujintao").update(query, stuFound);
}
public void testGpsData() {
try {
//13862082455:117.13172:029.77659:131.2580
Date d = new Date();
SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd HH:mm:ss SSS");
String dateNowStr = sdf.format(d);
System.out.println(dateNowStr);
DBCollection coll = MongoInit.getColl("table_admin");
BasicDBObject doc = new BasicDBObject();
doc.put("id", "12345678");
doc.put("time", dateNowStr);
doc.put("data", "117.13172:029.77659:131.2580");
doc.put("status", "0");
coll.insert(doc);
// 设定write concern，以便操作失败时得到提示
coll.setWriteConcern(WriteConcern.SAFE);
BasicDBObject dsort = new BasicDBObject();
dsort.put("time", -1);
BasicDBObject searchDevice = new BasicDBObject();
searchDevice.put("id", "12345678");
DBCursor cursor = coll.find(searchDevice).sort(dsort);
List<DBObject> list = cursor.toArray();
//ArrayList<SensorData> listSensorData=new ArrayList<SensorData>(list.size());
ObjectMapper mapper = new ObjectMapper();
String jsonfromList = null;
try {
//list转json
jsonfromList = mapper.writeValueAsString(list);
} catch (JsonProcessingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//System.out.println(jsonfromList);
// for(int i=0;i<list.size();i++)
// {
// System.out.println((String) list.get(i).get("time"));
//}
//System.out.println(list.size()+","+listSensorData);//list的长度
// System.out.println(cursor.count());//计算结果的数量，类似于(mysql count()函数),不受limit的影响
// while (cursor.hasNext()) {
// System.out.println(cursor.next());
// }
System.out.println("The Search Query has Executed!");
} catch (MongoException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
String dbname="wlwdb";
String dbCollection="table_admin";
String dbCollection1="15257102317";
String dataID="12345678";
MongoUtils tb=new MongoUtils();
tb.testGetDBS();//查询所有数据库
tb.getAllCollections();//查询所有表
//
// tb.findOne(dbCollection);//查找第一条记录
tb.testGpsData();
tb.getAllDocuments(dbCollection);//获取制定表明的所有数据
//tb.dropDatabase(dbname);//删除指定数据库
//tb.delete(dbCollection,dataID);//删除制定表明和设备ID的数据
//tb.dropCollection(dbCollection);// 删除一个表
//tb.createIndex(dbCollection1);//创建索引
//tb.getIndexInfo(dbCollection1);//获得表中所有索引
}
}登录后复制
#端口设置 DBPort=27017 #URL DBUrl=localhost #URL DBName=wlwdb
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PHP适合web开发，特别是在快速开发和处理动态内容方面表现出色，但不擅长数据科学和企业级应用。与Python相比，PHP在web开发中更具优势，但在数据科学领域不如Python；与Java相比，PHP在企业级应用中表现较差，但在web开发中更灵活；与JavaScript相比，PHP在后端开发中更简洁，但在前端开发中不如JavaScript。
PHP与Python：核心功能
Apr 13, 2025 am 12:16 AM
PHP和Python各有优势，适合不同场景。1.PHP适用于web开发，提供内置web服务器和丰富函数库。2.Python适合数据科学和机器学习，语法简洁且有强大标准库。选择时应根据项目需求决定。
PHP：许多网站的基础
Apr 13, 2025 am 12:07 AM
PHP成为许多网站首选技术栈的原因包括其易用性、强大社区支持和广泛应用。1)易于学习和使用，适合初学者。2)拥有庞大的开发者社区，资源丰富。3)广泛应用于WordPress、Drupal等平台。4)与Web服务器紧密集成，简化开发部署。
使用 Composer 解决推荐系统的困境：andres-montanez/recommendations-bundle 的实践
Apr 18, 2025 am 11:48 AM
在开发一个电商网站时，我遇到了一个棘手的问题：如何为用户提供个性化的商品推荐。最初，我尝试了一些简单的推荐算法，但效果并不理想，用户的满意度也因此受到影响。为了提升推荐系统的精度和效率，我决定采用更专业的解决方案。最终，我通过Composer安装了andres-montanez/recommendations-bundle，这不仅解决了我的问题，还大大提升了推荐系统的性能。可以通过一下地址学习composer：学习地址
PHP的影响：网络开发及以后
Apr 18, 2025 am 12:10 AM
PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
PHP与Python：用例和应用程序
Apr 17, 2025 am 12:23 AM
PHP适用于Web开发和内容管理系统，Python适合数据科学、机器学习和自动化脚本。1.PHP在构建快速、可扩展的网站和应用程序方面表现出色，常用于WordPress等CMS。2.Python在数据科学和机器学习领域表现卓越，拥有丰富的库如NumPy和TensorFlow。
CentOS MongoDB备份策略是什么
Apr 14, 2025 pm 04:51 PM
CentOS系统下MongoDB高效备份策略详解本文将详细介绍在CentOS系统上实施MongoDB备份的多种策略，以确保数据安全和业务连续性。我们将涵盖手动备份、定时备份、自动化脚本备份以及Docker容器环境下的备份方法，并提供备份文件管理的最佳实践。手动备份:利用mongodump命令进行手动全量备份，例如：mongodump-hlocalhost:27017-u用户名-p密码-d数据库名称-o/备份目录此命令会将指定数据库的数据及元数据导出到指定的备份目录。
