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使用java操作MongoDB
1.环境准备
下载mongoDB对Java支持的驱动包
驱动包下载地址：https://github.com/mongodb/mongo-java-driver/downloads
2.查询集合中所有文档
Mongo mongo = new Mongo("localhost",27017);
DB db = mongo.getDB("test");
DBCollection collection = db.getCollection("customer");
DBCursor dbCursor = collection.find();
System.out.println(collection.getCount());
while(dbCursor.hasNext()){
System.out.println(dbCursor.next());
}
mongo.close();
3.删除集合中的文档
Mongo mongo = new Mongo("localhost",27017);
DB db = mongo.getDB("test");
DBCollection collection = db.getCollection("customer");
BasicDBObject o = new BasicDBObject("_id", new ObjectId("5199ee647d5fc789bc760c07"));
collection.remove(o);
mongo.close();
4.向集合中插入文档
Mongo mongo = new Mongo("localhost",27017);
DB db = mongo.getDB("test");
DBCollection collection = db.getCollection("customer");
DBObject c = new BasicDBObject();
c.put("name", “jack");
c.put("age", 24);
collection.insert(c);
mongo.close();
5.更新集合中的文档
Mongo mongo = new Mongo("localhost",27017);
DB db = mongo.getDB("test");
DBCollection collection = db.getCollection("customer");
BasicDBObject query = new BasicDBObject("_id",new ObjectId("519e2e393296cf3baccdb10c"));
BasicDBObject object = (BasicDBObject) collection.findOne(query);
object.put("name", “wangwu");
int n = collection.update(query, object).getN();
System.out.println(n);
mongo.close();
使用java操作MongoDB
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