mongodb的增删改查

mongodb的增删改查

[java]
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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);
}
}