private Mongo mg = null;
private DB db;
private DBCollection users;
@Before
public void init() {
try {
mg = new Mongo();
// mg = new Mongo("localhost", 27017);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (MongoException e) {
e.printStackTrace();
}
// 获取temp DB;如果默认没有创建,mongodb会自动创建
db = mg.getDB("temp");
// 获取users DBCollection;如果默认没有创建,mongodb会自动创建
users = db.getCollection("users");
}
@After
public void destory() {
if (mg != null)
mg.close();
mg = null;
db = null;
users = null;
System.gc();
}
private void print(Object o) {
System.out.println(o);
}
@Test
public void queryAll() {
print("查询users的所有数据:");
// db游标
DBCursor cur = users.find();
while (cur.hasNext()) {
print(cur.next());
}
}
@Test
public void add() {
// 先查询所有数据
queryAll();
print("添加前count: " + users.count());
DBObject user = new BasicDBObject();
user.put("name", "Lily");
user.put("age", 23);
// users.save(user)保存,getN()获取影响行数
// print(users.save(user).getN());
// 扩展字段,随意添加字段,不影响现有数据
user.put("sex", "女");
print("添加一条记录后返回影响行数: " + users.save(user).getN());
// 添加多条数据,传递Array对象
print("插入数组对象返回影响行数: " +users.insert(user, new BasicDBObject("name", "tom")).getN());
// 添加List集合
List<DBObject> list = new ArrayList<DBObject>();
list.add(user);
DBObject user2 = new BasicDBObject("name", "lucy");
user.put("age", 22);
list.add(user2);
// 添加List集合
print("添加List后返回影响行数: " +users.insert(list).getN());
// 查询下数据,看看是否添加成功
print("插入后count: " + users.count());
queryAll();
}
@Test
public void modify() {
DBObject user = new BasicDBObject();
user.put("name", "Lucy");
user.put("age", 35);
user.put("sex", "女");
users.update(new BasicDBObject("age", 121) , user);
print("已修改");
queryAll();
}
@Test
public void remove() {
queryAll();
print("remove age >= 24: " + users.remove(new BasicDBObject("age", new BasicDBObject("$gte", 24))));
queryAll();
}
@Test
public void query() {
//查询所有
//queryAll();
//查询id = 4de73f7acd812d61b4626a77
print("find id = 4de73f7acd812d61b4626a77: " + users.find(new BasicDBObject("_id", new ObjectId("4de73f7acd812d61b4626a77"))).toArray());
//查询age = 24
print("find age = 23: " + users.find(new BasicDBObject("age", 23),new BasicDBObject("name", "Lily")).toArray());
//查询age >= 24
print("find age >= 24: " + users.find(new BasicDBObject("age", new BasicDBObject("$gte", 24))).toArray());
print("find age <= 24: " + users.find(new BasicDBObject("age", new BasicDBObject("$lte", 24))).toArray());
print("查询age!=25:" + users.find(new BasicDBObject("age", new BasicDBObject("$ne", 25))).toArray());
print("查询age in 25/26/27:" + users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.IN, new int[] { 25, 26, 27 }))).toArray());
print("查询age not in 25/26/27:" + users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.NIN, new int[] { 25, 26, 27 }))).toArray());
print("查询age exists 排序:" + users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.EXISTS, true))).toArray());
print("只查询age属性:" + users.find(null, new BasicDBObject("age", true)).toArray());
print("只查属性:" + users.find(null, new BasicDBObject("age", true), 0, 2).toArray());
print("只查属性:" + users.find(null, new BasicDBObject("age", true), 0, 2, Bytes.QUERYOPTION_NOTIMEOUT).toArray());
//只查询一条数据,多条去第一条
print("findOne: " + users.findOne());
print("findOne: " + users.findOne(new BasicDBObject("age", 26)));
print("findOne: " + users.findOne(new BasicDBObject("age", 26), new BasicDBObject("name", true)));
//查询修改、删除
print("findAndRemove 查询age=25的数据,并且删除: " + users.findAndRemove(new BasicDBObject("age", 25)));
//查询age=26的数据,并且修改name的值为Abc
print("findAndModify: " + users.findAndModify(new BasicDBObject("age", 26), new BasicDBObject("name", "Abc")));
print("findAndModify: " + users.findAndModify(
new BasicDBObject("age", 28), //查询age=28的数据
new BasicDBObject("name", true), //查询name属性
new BasicDBObject("age", true), //按照age排序
false, //是否删除,true表示删除
new BasicDBObject("name", "Abc"), //修改的值,将name修改成Abc
true,
true));
queryAll();
}
public void testOthers() {
DBObject user = new BasicDBObject();
user.put("name", "hoojo");
user.put("age", 24);
//JSON 对象转换
print("serialize: " + JSON.serialize(user));
//反序列化
print("parse: " + JSON.parse("{ \"name\" : \"hoojo\" , \"age\" : 24}"));
print("判断temp Collection是否存在: " + db.collectionExists("temp"));
//如果不存在就创建
if (!db.collectionExists("temp")) {
DBObject options = new BasicDBObject();
options.put("size", 20);
options.put("capped", 20);
options.put("max", 20);
print(db.createCollection("account", options));
}
//设置db为只读
db.setReadOnly(true);
//只读不能写入数据
db.getCollection("test").save(user);
}
官方API:
http://docs.mongodb.org/manual/
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