MongoDB增删改查操作代码演示
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
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("$gte", 24))).getN());
}
@Test
public void modify() {
print("修改：" + users.update(new BasicDBObject("_id", new ObjectId("525abdceb0c6510d21f5b429")), new BasicDBObject("age", 99)).getN());
Map
map.put("age", 9999);
map.put("name", "liuxiaochen");
map.put("class", "software");
print("修改：" + users.update(
new BasicDBObject("_id", new ObjectId("525abdceb0c6510d21f5b429")),
new BasicDBObject(map),
true,//如果数据库不存在，是否添加
false//多条修改
).getN());
print("修改：" + users.update(
new BasicDBObject("name", "haha"),
new BasicDBObject("name", "dingding"),
true,//如果数据库不存在，是否添加
true//false只修改第一天，true如果有多条就不修改
).getN());
//当数据库不存在就不修改、不添加数据，当多条数据就不修改
//print("修改多条：" + coll.updateMulti(new BasicDBObject("_id", new ObjectId("4dde23616be7c19df07db42c")), new BasicDBObject("name", "199")));
}
@Test
public void query() {
//查询所有
//queryAll();
//查询id = 4de73f7acd812d61b4626a77
print("find id = 4de73f7acd812d61b4626a77: " + users.find(new BasicDBObject("_id", new ObjectId("4de73f7acd812d61b4626a77"))).toArray());
//查询age = 24
print("find age = 24: " + users.find(new BasicDBObject("age", 24)).toArray());
//查询age >= 24
print("find age >= 24: " + users.find(new BasicDBObject("age", new BasicDBObject("$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);
}
}
MongoDB增删改查操作代码演示
