mongodb-java-driver基本用法

1、先 目前最新版本是2.9.3

2、下面是基本的CRUD示例代码:

 1 package MongoDB;
 2 
 3 import com.mongodb.BasicDBObject;
 4 import com.mongodb.DB;
 5 import com.mongodb.DBCollection;
 6 import com.mongodb.DBCursor;
 7 import com.mongodb.DBObject;
 8 import com.mongodb.Mongo;
 9 import java.net.UnknownHostException;
10 import java.util.Set;
11 
12 import org.junit.Test;
13 
14 public class TestMongoDBDriver {
15 
16     @Test
17     public void testCRUD() throws UnknownHostException {
18         // 连接到mongodb
19         Mongo mongo = new Mongo("localhost", 27017);
20 
21         // 打开数据库test
22         DB db = mongo.getDB("test");
23 
24         // 遍历所有集合的名字
25         Set<String> colls = db.getCollectionNames();
26         for (String s : colls) {
27             System.out.println(s);
28             // 先删除所有Collection(类似于关系数据库中的"表")
29             if (!s.equals("system.indexes")) {
30                 db.getCollection(s).drop();
31             }
32         }
33 
34         // 取得集合emp(若：emp不存在，mongodb将自动创建该集合)
35         DBCollection coll = db.getCollection("emp");
36 
37         // delete all
38         DBCursor dbCursor = coll.find();
39         for (DBObject dbObject : dbCursor) {
40             coll.remove(dbObject);
41         }
42 
43         // create
44         BasicDBObject doc = new BasicDBObject("name", "杨俊明").append("sex", "男")
45                 .append("address",
46                         new BasicDBObject("postcode", "201202").append(
47                                 "street", "田林路888号").append("city", "上海"));
48         coll.insert(doc);
49 
50         // retrieve
51         BasicDBObject docFind = new BasicDBObject("name", "杨俊明");
52         DBObject findResult = coll.findOne(docFind);
53         System.out.println(findResult);
54 
55         // update
56         doc.put("sex", "MALE");// 把sex属性从"男"，改成"MALE"
57         coll.update(docFind, doc);
58         findResult = coll.findOne(docFind);
59         System.out.println(findResult);
60 
61         coll.dropIndexes();// 先删除所有索引
62         // create index
63         coll.createIndex(new BasicDBObject("name", 1)); // 1代表升序
64     }
65 
66 }

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