在线查看源码:https://github.com/mongodb/mongo-java-driver
maven配置:
org.mongodb
mongo-java-driver
2.11.1
(1) 简单的mongoDB数据库操作
public class SimpleTest {
public static void main(final String[] args) throws UnknownHostException {
Mongo mg = new Mongo();
// 查询所有的Database
for (String name : mg.getDatabaseNames()) {
System.out.println("dbName: " + name);
}
DB db = mg.getDB("test");
// 查询所有的聚集集合
for (String name : db.getCollectionNames()) {
System.out.println("collectionName: " + name);
}
DBCollection users = db.getCollection("users");
// 查询所有的数据
DBCursor cur = users.find();
while (cur.hasNext()) {
System.out.println(cur.next());
}
System.out.println(cur.count());
System.out.println(cur.getCursorId());
System.out.println(JSON.serialize(cur));
}
}
public class CRUDTest {
private Mongo mg = null;
private DB db;
private DBCollection users;
public static void main(String[] args) {
CRUDTest tobj = new CRUDTest();
tobj.init();
tobj.add();
// tobj.query();
// tobj.modify();
// tobj.remove();
// tobj.testOthers();
tobj.destory();
}
private void init() {
try {
mg = new Mongo();
// mg = new Mongo("localhost", 27017);
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (MongoException e) {
e.printStackTrace();
}
// 获取test DB;如果默认没有创建,mongodb会自动创建
db = mg.getDB("test");
// 获取users DBCollection;如果默认没有创建,mongodb会自动创建
users = db.getCollection("users");
}
private void destory() {
if (mg != null) {
mg.close();
}
mg = null;
db = null;
users = null;
System.gc();
}
public void print(Object o) {
System.out.println(o);
}
/**
* 查询所有数据
*/
private void queryAll() {
print("查询users的所有数据:");
DBCursor cur = users.find();
while (cur.hasNext()) {
print(cur.next());
}
}
/**
* 添加操作
*/
public void add() {
// 查询数据
queryAll();
print("count: " + users.count());
DBObject user = new BasicDBObject();
user.put("name", "lilei");
user.put("age", 20);
user.put("sex", "male");
// users.save(user)保存,getN()获取影响行数
print(users.save(user).getN());
// 添加多条数据,传递Array对象
DBObject user2 = new BasicDBObject("name", "hanmeimei");
user2.put("age", 18);
print(users.insert(user2, new BasicDBObject("name", "jim")).getN());
// 添加多条数据,传递List集合
List list = new ArrayList();
DBObject user3 = new BasicDBObject("name", "lucy");
user3.put("age", 22);
list.add(user3);
DBObject user4 = new BasicDBObject("name", "tom");
user4.put("age", 22);
list.add(user4);
print(users.insert(list).getN());
// 查询数据
print("count: " + users.count());
queryAll();
}
public void query() {
// 查询id
print("查询 id = 54f511b4e4b0ded60d95c333: "
+ users.find(new BasicDBObject("_id", new ObjectId("54f511b4e4b0ded60d95c333"))).toArray());
// 查询age
print("查询 age = 24: " + users.find(new BasicDBObject("age", 24)).toArray());
print("查询 age >= 24: " + users.find(new BasicDBObject("age", new BasicDBObject("$gte", 24))).toArray());
print("查询 age <= 24: " + users.find(new BasicDBObject("age", new BasicDBObject("$lte", 24))).toArray());
print("查询 age != 25:" + users.find(new BasicDBObject("age", new BasicDBObject("$ne", 25))).toArray());
print("查询 age in 25/26/27:"
+ users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.IN, new int[] { 25, 26, 27 })))
.toArray());
print("查询age not in 25/26/27:"
+ users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.NIN, new int[] { 25, 26, 27 })))
.toArray());
print("查询age exists 排序:"
+ users.find(new BasicDBObject("age", new BasicDBObject(QueryOperators.EXISTS, true))).toArray());
print("只查询age属性:" + users.find(null, new BasicDBObject("age", true)).toArray());
print("只查属性:" + users.find(null, new BasicDBObject("age", true), 0, 2).toArray());
print("只查属性:" + users.find(null, new BasicDBObject("age", true), 0, 2, Bytes.QUERYOPTION_NOTIMEOUT).toArray());
// 只查询一条数据,多条去第一条
print("findOne: " + users.findOne());
print("findOne: " + users.findOne(new BasicDBObject("age", 26)));
print("findOne: " + users.findOne(new BasicDBObject("age", 26), new BasicDBObject("name", true)));
// 查询修改、删除
print("findAndRemove 查询age=25的数据,并且删除: " + users.findAndRemove(new BasicDBObject("age", 25)));
// 查询age=26的数据,并且修改name的值为Abc
print("findAndModify: " + users.findAndModify(new BasicDBObject("age", 26), new BasicDBObject("name", "Abc")));
print("findAndModify: " + users.findAndModify(new BasicDBObject("age", 28), // 查询age=28的数据
new BasicDBObject("name", true), // 查询name属性
new BasicDBObject("age", true), // 按照age排序
false, // 是否删除,true表示删除
new BasicDBObject("name", "Abc"), // 修改的值,将name修改成Abc
true, true));
queryAll();
}
/**
* 修改操作
*/
public void modify() {
print("修改:" + users.update(new BasicDBObject("name", "hanmeimei"), new BasicDBObject("age", 25)).getN());
print("修改:"
+ users.update(new BasicDBObject("age", new BasicDBObject("$gte", 22)), new BasicDBObject("age", 121),
true,// 如果数据库不存在,是否添加
false// false只修改第一条,true如果有多条就不修改
).getN());
}
/**
* 删除操作
*/
public void remove() {
print("删除id = 54f511b4e4b0ded60d95c333:"
+ users.remove(new BasicDBObject("_id", new ObjectId("54f511b4e4b0ded60d95c333"))).getN());
print("remove age >= 22: " + users.remove(new BasicDBObject("age", new BasicDBObject("$gte", 22))).getN());
}
/**
* 其他操作
*/
public void testOthers() {
DBObject user = new BasicDBObject();
user.put("name", "demo");
user.put("age", 24);
// JSON 对象转换
print("serialize: " + JSON.serialize(user));
// 反序列化
print("parse: " + JSON.parse("{ \"name\" : \"demo\" , \"age\" : 24}"));
// 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);
}
}