mongodb学习总结(二)
public class App {
/**
* 无密码连接mongodb服务
*/
public void connectToMongoNoPasswd() throws Exception{
//连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "192.168.1.5" , 27017 );
//连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("col");
System.out.println("Connect to database successfully");
}
/**
* 设置密码连接mongodb服务
*/
public void connectToMongoByPasswd() throws Exception{
//ServerAddress()两个参数分别为 服务器地址 和 端口
ServerAddress serverAddress = new ServerAddress("192.168.1.5",27017);
List<ServerAddress> addrs = new ArrayList<ServerAddress>();
addrs.add(serverAddress);
//MongoCredential.createScramSha1Credential()三个参数分别为 用户名 数据库名称 密码
MongoCredential credential = MongoCredential.createScramSha1Credential("username",
"databaseName", "password".toCharArray());
List<MongoCredential> credentials = new ArrayList<MongoCredential>();
credentials.add(credential);
//通过连接认证获取MongoDB连接
MongoClient mongoClient = new MongoClient(addrs,credentials);
//连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("databaseName");
System.out.println("Connect to database successfully");
}
/**
* 创建集合
*/
public void createCol() throws Exception{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient( "192.168.1.5" , 27017 );
// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("col");
System.out.println("Connect to database successfully");
mongoDatabase.createCollection("test");
System.out.println("集合创建成功");
}
/**
* 获取集合
*/
public void getCol() throws Exception{
//连接到 mongodb服务
MongoClient mongoClient = new MongoClient( "192.168.1.5" , 27017 );
//连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("col");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");
}
/**
* 插入文档
*/
public void addDoc() throws Exception{
// 连接到 mongodb 服务
MongoClient mongoClient = new MongoClient("192.168.1.5", 27017 );
// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("col");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");
//插入文档
/**
* 1. 创建文档 org.bson.Document 参数为key-value的格式
* 2. 创建文档集合List<Document>
* 3. 将文档集合插入数据库集合中 mongoCollection.insertMany(List<Document>)
* 插入单个文档可以用 mongoCollection.insertOne(Document)
**/
Document document = new Document("title", "mongo")
.append("description", "database")
.append("likes", 100)
.append("by", "Fly");
List<Document> documents = new ArrayList<Document>();
documents.add(document);
collection.insertMany(documents);
System.out.println("文档插入成功");
}
/**
* 检索所有文档
*/
public void findDoc() throws Exception{
//连接到 mongodb服务
MongoClient mongoClient = new MongoClient( "192.168.1.5" , 27017 );
// 连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("col");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");
//检索所有文档
/**
*1. 获取迭代器FindIterable<Document>
*2. 获取游标MongoCursor<Document>
*3. 通过游标遍历检索出的文档集合
**/
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while(mongoCursor.hasNext()){
System.out.println(mongoCursor.next());
}
}
/**
* 更新文档
*/
public void updateDoc() throws Exception{
//连接到 mongodb服务
MongoClient mongoClient = new MongoClient("192.168.1.5", 27017);
//连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("col");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");
//更新文档 将文档中likes=100的文档修改为likes=200
collection.updateMany(Filters.eq("likes", 100), new Document("$set",new Document("likes",200)));
//检索查看结果
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while(mongoCursor.hasNext()){
System.out.println(mongoCursor.next());
}
}
/**
* 删除文档
*/
public void delDoc() throws Exception{
//连接到 mongodb 服务
MongoClient mongoClient = new MongoClient("192.168.1.5", 27017);
//连接到数据库
MongoDatabase mongoDatabase = mongoClient.getDatabase("col");
System.out.println("Connect to database successfully");
MongoCollection<Document> collection = mongoDatabase.getCollection("test");
System.out.println("集合 test 选择成功");
//删除符合条件的第一个文档
collection.deleteOne(Filters.eq("likes", 200));
//删除所有符合条件的文档
collection.deleteMany(Filters.eq("likes", 200));
//检索查看结果
FindIterable<Document> findIterable = collection.find();
MongoCursor<Document> mongoCursor = findIterable.iterator();
while(mongoCursor.hasNext()){
System.out.println(mongoCursor.next());
}
}
public static void main( String[] args ) {
try {
App app = new App();
app.delDoc();
} catch (Exception e) {
e.printStackTrace();
}
}
}
参考:http://www.runoob.com/mongodb/mongodb-tutorial.html
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