采取java操作MongoDB

1.环境准备

下载mongoDB对Java支持之使包

令包下载地址:https://github.com/mongodb/mongo-java-driver/downloads

 

2.询问集合中具备文档

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.去集合中的文档

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.朝集中插入文档

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.翻新集合中的文档

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();

  

  

 

 

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