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MongoDB--GettingStartedwithJavaDriver

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2016-06-07 15:59:34961browse

原文链接 http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-java-driver/ 介绍 本文的目的是让你对如何使用Mongodb的java-driver驱动有一个简单的了解,当你阅读完本文你就可以参考其他文章以了解更多信息。 下载java-driver驱动 你可以在

原文链接

http://docs.mongodb.org/ecosystem/tutorial/getting-started-with-java-driver/

介绍

本文的目的是让你对如何使用Mongodb的java-driver驱动有一个简单的了解,当你阅读完本文你就可以参考其他文章以了解更多信息。

下载java-driver驱动

你可以在这里下载需要的驱动。

添加java-driver驱动

将下载的mongo-java-driver-2.12.3.jar 拷贝到你的lib目录下。

获取数据库对象

MongoClient mongoClient = new MongoClient( "localhost" , 5000 ); // 5000 为实例端口号,默认启动端口号为27017

DB db = mongoClient.getDB("mydb"); // 必须要先创建数据库

获取集合名称

Set colls = db.getCollectionNames();

for (String s : colls) {
System.out.println(s);
}

获取集合对象

DBCollection coll = db.getCollection("blog");

获取集合文档数

System.out.println(coll.getCount());

插入一个文档

BasicDBObject doc = new BasicDBObject("name", "MongoDB")
.append("type", "database")
.append("count", 1)
.append("info", new BasicDBObject("x", 203).append("y", 102));
coll.insert(doc);

插入多个文档

for (int i=0; i coll.insert(new BasicDBObject("i", i));
}

使用游标查询满足条件的文档

BasicDBObject query = new BasicDBObject("i", 71);

DBCursor cursor = coll.find(query);

try {
while(cursor.hasNext()) {
System.out.println(cursor.next());
}
} finally {
cursor.close();
}

BulkWriteOperation builder = coll.initializeOrderedBulkOperation();
builder.insert(new BasicDBObject("_id", 1));
builder.insert(new BasicDBObject("_id", 2));
builder.insert(new BasicDBObject("_id", 3));

更新已存在的文档

builder.find(new BasicDBObject("_id", 1)).updateOne(new BasicDBObject("$set", new BasicDBObject("x", 2)));

删除已存在的文档

builder.find(new BasicDBObject("_id", 2)).removeOne();
builder.find(new BasicDBObject("_id", 3)).replaceOne(new BasicDBObject("_id", 3).append("x", 4));

BulkWriteResult result = builder.execute();
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