四、MongoDB原生Java客戶端
阿新 • • 發佈:2020-12-02
MongoDB原生Java客戶端
1.Maven依賴
<!-- mongodb -->
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>3.5.0</version>
</dependency>
2.第一種方式:Document
2.1 連線MongoDB
// 資料庫 private MongoDatabase db; // 文件集合 private MongoCollection<Document> doc; // 連線客戶端(內建執行緒池) private MongoClient client; @Before public void init() { client = new MongoClient("192.168.137.100", 27017); db = client.getDatabase("rab"); doc = db.getCollection("users"); }
2.2 新增
@Test public void insertDemo() { Document doc1 = new Document(); doc1.append("username", "cang"); doc1.append("country", "USA"); doc1.append("age", 20); doc1.append("lenght", 1.77f); doc1.append("salary", new BigDecimal("6565.22"));// 存金額,使用bigdecimal這個資料型別 Map<String, String> address1 = new HashMap<>(); address1.put("aCode", "0000"); address1.put("add", "xxx000"); doc1.append("address", address1); // 新增“favorites”子文件,其中兩個屬性是陣列 Map<String, Object> favorites1 = new HashMap<String, Object>(); favorites1.put("movies", Arrays.asList("aa", "bb")); favorites1.put("cites", Arrays.asList("東莞", "東京")); doc1.append("favorites", favorites1); Document doc2 = new Document(); doc2.append("username", "Chen"); doc2.append("country", "China"); doc2.append("age", 30); doc2.append("lenght", 1.77f); doc2.append("salary", new BigDecimal("8888.22")); Map<String, String> address2 = new HashMap<>(); address2.put("aCode", "411000"); address2.put("add", "我的地址2"); doc2.append("address", address2); Map<String, Object> favorites2 = new HashMap<>(); favorites2.put("movies", Arrays.asList("東遊記", "一路向東")); favorites2.put("cites", Arrays.asList("珠海", "東京")); doc2.append("favorites", favorites2); // 使用insertMany插入多條資料 doc.insertMany(Arrays.asList(doc1, doc2)); }
2.3 查詢
@Test public void testFind() { final List<Document> ret = new ArrayList<>(); // block介面專門用於處理查詢出來的資料 Block<Document> printBlock = new Block<Document>() { @Override public void apply(Document t) { logger.info(t.toJson());// 列印資料 ret.add(t); } }; // select * from users where favorites.cites has "東莞"、"東京" // db.users.find({ "favorites.cites" : { "$all" : [ "東莞" , "東京"]}}) Bson all = all("favorites.cites", Arrays.asList("東莞", "東京")); FindIterable<Document> find = doc.find(all); find.forEach(printBlock); logger.info("------------------>" + String.valueOf(ret.size())); ret.removeAll(ret); // select * from users where username like '%s%' and (contry= English or contry // = USA) // db.users.find({ "$and" : [ { "username" : { "$regex" : ".*s.*"}} , { "$or" : // [ { "country" : "English"} , { "country" : "USA"}]}]}) String regexStr = ".*s.*"; Bson regex = regex("username", regexStr);// 定義資料過濾器,username like '%s%' Bson or = or(eq("country", "English"), eq("country", "USA"));// 定義資料過濾器,(contry= English or contry = USA) Bson and = and(regex, or); FindIterable<Document> find2 = doc.find(and); find2.forEach(printBlock); logger.info("------------------>" + String.valueOf(ret.size())); }
2.4 修改
@Test
public void testUpdate() {
// update users set age=6 where username = 'lison'
// db.users.updateMany({ "username" : "lison"},{ "$set" : { "age" : 6}},true)
Bson eq = eq("username", "lison"); // 定義資料過濾器,username = 'lison'
Bson set = set("age", 8);// 更新的欄位.來自於Updates包的靜態匯入
UpdateResult updateMany = doc.updateMany(eq, set);
logger.info("------------------>" + String.valueOf(updateMany.getModifiedCount()));// 列印受影響的行數
// update users set favorites.movies add "小電影2 ", "小電影3" where favorites.cites
// has "東莞"
// db.users.updateMany({ "favorites.cites" : "東莞"}, { "$addToSet" : {
// "favorites.movies" : { "$each" : [ "小電影2 " , "小電影3"]}}},true)
Bson eq2 = eq("favorites.cites", "東莞");
Bson addEachToSet = addEachToSet("favorites.movies", Arrays.asList("小電影2 ", "小電影3"));// 更新的欄位.來自於Updates包的靜態匯入
UpdateResult updateMany2 = doc.updateMany(eq2, addEachToSet);
logger.info("------------------>" + String.valueOf(updateMany2.getModifiedCount()));
}
2.5 刪除
@Test
public void testDelete() {
// delete from users where username = ‘lison’
Bson eq = eq("username", "lison"); // 定義資料過濾器,username='lison'
DeleteResult deleteMany = doc.deleteMany(eq);
logger.info("------------------>" + String.valueOf(deleteMany.getDeletedCount()));// 列印受影響的行數
// delete from users where age >8 and age <25
Bson gt = gt("age", 8);// 定義資料過濾器,age > 8,所有過濾器的定義來自於Filter這個包的靜態方法,需要頻繁使用所以靜態匯入
// Bson gt = Filter.gt("age",8);
Bson lt = lt("age", 25);// 定義資料過濾器,age < 25
Bson and = and(gt, lt);// 定義資料過濾器,將條件用and拼接
DeleteResult deleteMany2 = doc.deleteMany(and);
logger.info("------------------>" + String.valueOf(deleteMany2.getDeletedCount()));// 列印受影響的行數
}
3.第二種方式:Pojo
3.1 連線MongoDB
private MongoDatabase db;
private MongoCollection<User> doc;
private MongoClient client;
@Before
public void init() {
// 編解碼器的list
List<CodecRegistry> codecResgistes = new ArrayList<>();
// list加入預設的編解碼器集合
codecResgistes.add(MongoClient.getDefaultCodecRegistry());
// 生成一個pojo的編解碼器
CodecRegistry pojoCodecRegistry = CodecRegistries
.fromProviders(PojoCodecProvider.builder().automatic(true).build());
// list加入pojo的編解碼器
codecResgistes.add(pojoCodecRegistry);
// 通過編解碼器的list生成編解碼器註冊中心
CodecRegistry registry = CodecRegistries.fromRegistries(codecResgistes);
// 把編解碼器註冊中心放入MongoClientOptions
// MongoClientOptions相當於連線池的配置資訊
MongoClientOptions build = MongoClientOptions.builder().codecRegistry(registry).build();
ServerAddress serverAddress = new ServerAddress("192.168.137.100", 27017);
client = new MongoClient(serverAddress, build);
db = client.getDatabase("lison");
doc = db.getCollection("users", User.class);
}
3.2 新增
@Test
public void insertDemo() {
User user = new User();
user.setUsername("cang");
user.setCountry("USA");
user.setAge(20);
user.setLenght(1.77f);
user.setSalary(new BigDecimal("6265.22"));
// 新增“address”子文件
Address address1 = new Address();
address1.setaCode("411222");
address1.setAdd("sdfsdf");
user.setAddress(address1);
// 新增“favorites”子文件,其中兩個屬性是陣列
Favorites favorites1 = new Favorites();
favorites1.setCites(Arrays.asList("東莞", "東京"));
favorites1.setMovies(Arrays.asList("西遊記", "一路向西"));
user.setFavorites(favorites1);
User user1 = new User();
user1.setUsername("chen");
user1.setCountry("China");
user1.setAge(30);
user1.setLenght(1.77f);
user1.setSalary(new BigDecimal("6885.22"));
Address address2 = new Address();
address2.setaCode("411000");
address2.setAdd("我的地址2");
user1.setAddress(address2);
Favorites favorites2 = new Favorites();
favorites2.setCites(Arrays.asList("珠海", "東京"));
favorites2.setMovies(Arrays.asList("東遊記", "一路向東"));
user1.setFavorites(favorites2);
// 使用insertMany插入多條資料
doc.insertMany(Arrays.asList(user, user1));
}
3.3 查詢
@Test
public void testFind() {
final List<User> ret = new ArrayList<>();
Block<User> printBlock = new Block<User>() {
@Override
public void apply(User t) {
System.out.println(t.toString());
ret.add(t);
}
};
// select * from users where favorites.cites has "東莞"、"東京"
Bson all = all("favorites.cites", Arrays.asList("東莞", "東京"));// 定義資料過濾器,喜歡的城市中要包含"東莞"、"東京"
FindIterable<User> find = doc.find(all);
find.forEach(printBlock);
logger.info("------------------>" + String.valueOf(ret.size()));
ret.removeAll(ret);
// select * from users where username like '%s%' and (contry= English or contry
// = USA)
String regexStr = ".*s.*";
Bson regex = regex("username", regexStr);// 定義資料過濾器,username like '%s%'
Bson or = or(eq("country", "English"), eq("country", "USA"));// 定義資料過濾器,(contry= English or contry = USA)
FindIterable<User> find2 = doc.find(and(regex, or));
find2.forEach(printBlock);
logger.info("------------------>" + String.valueOf(ret.size、()));
}
3.4 更新
@Test
public void testUpdate() {
// update users set age=6 where username = 'lison'
Bson eq = eq("username", "lison");// 定義資料過濾器,username = 'lison'
Bson set = set("age", 8);// 更新的欄位.來自於Updates包的靜態匯入
UpdateResult updateMany = doc.updateMany(eq, set);
logger.info("------------------>" + String.valueOf(updateMany.getModifiedCount()));// 列印受影響的行數
// update users set favorites.movies add "小電影2 ", "小電影3" where favorites.cites
// has "東莞"
Bson eq2 = eq("favorites.cites", "東莞");// 定義資料過濾器,favorites.cites has "東莞"
Bson addEachToSet = addEachToSet("favorites.movies", Arrays.asList("小電影2 ", "小電影3"));// 更新的欄位.來自於Updates包的靜態匯入
UpdateResult updateMany2 = doc.updateMany(eq2, addEachToSet);
logger.info("------------------>" + String.valueOf(updateMany2.getModifiedCount()));
}
3.5 刪除
@Test
public void testDelete() {
// delete from users where username = ‘lison’
Bson eq = eq("username", "lison");// 定義資料過濾器,username='lison'
DeleteResult deleteMany = doc.deleteMany(eq);
logger.info("------------------>" + String.valueOf(deleteMany.getDeletedCount()));// 列印受影響的行數
// delete from users where age >8 and age <25
Bson gt = gt("age", 8);// 定義資料過濾器,age > 8,所有過濾器的定義來自於Filter這個包的靜態方法,需要頻繁使用所以靜態匯入
Bson lt = lt("age", 25);// 定義資料過濾器,age < 25
Bson and = and(gt, lt);// 定義資料過濾器,將條件用and拼接
DeleteResult deleteMany2 = doc.deleteMany(and);
logger.info("------------------>" + String.valueOf(deleteMany2.getDeletedCount()));// 列印受影響的行數
}