Table of Contents
1. Java link to MongoDB
2. View the library and view the collection
3 , Java adds, deletes and modifies MongoDB query
1. Add data
2. Delete data
3. Modify data
4. Query data
Home Java javaTutorial Example analysis of common methods of connecting MongoDB in Java

Example analysis of common methods of connecting MongoDB in Java

May 26, 2023 pm 07:06 PM
java mongodb

1. Import the Mongo driver package

Example analysis of common methods of connecting MongoDB in Java

2. Get the Mongo link object

MongoClient mc = new MongoClient("localhost",27017);
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3. Close the link

mc.close();
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2. View the library and view the collection

1. Get the library object

MongoDatabase db = mc.getDatabase("myschool");
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2. Get the collection of tables in the library

MongoIterable<String> listCollectionNames = db.listCollectionNames();
        
MongoCursor<String> iterator = listCollectionNames.iterator();
    while (iterator.hasNext()) {
        System.out.println(iterator.next());
    }
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3 , Java adds, deletes and modifies MongoDB query

1. Add data

a. Add one piece of data

//创建对象
Student s = new Student();
s.setSid(1);
s.setSname("王俊凯");
s.setBirthday(new Date());
s.setSsex("男");
s.setClassid(2);
 
//将数据转换为json格式
Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd").create();
String json = gson.toJson(s);
 
//获取集合对象
MongoCollection<Document> collection = db.getCollection("student");
 
//添加一条数据,将json格式转换为document对象
collection.insertOne(Document.parse(json));
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b. Add multiple pieces of data

//存入数据
List<Document> dlist=new ArrayList<Document>();
 
for(int i=0; i<3; i++){
    Student s = new Student();
    s.setSid(Integer.toString(i+1));
    s.setSname("王源");
    s.setBirthday(new Date());
    s.setSsex("男");
    s.setClassid(1);
    //将数据转换为json格式
    Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd").create();
    String json = gson.toJson(s);
    dlist.add(Document.parse(json));
}
 
//获取集合对象
MongoCollection<Document> collection = db.getCollection("student");
 
//添加多条数据
collection.insertMany(dlist);
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2. Delete data

a. Delete one piece of data

//获取集合对象
MongoCollection<Document> collection = db.getCollection("student");
 
Student s = new Student();
s.setSid(1);
 
Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd").create();
Bson bson = Document.parse(gson.toJson(s));
 
DeleteResult deleteOne = collection.deleteOne(bson);
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b. Delete multiple pieces of data

//获取集合对象
MongoCollection<Document> collection = db.getCollection("student");
 
Student s = new Student();
s.setSname("王源");
 
Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd").create();
Bson bson = Document.parse(gson.toJson(s));
 
DeleteResult deleteMany = collection.deleteMany(bson);
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3. Modify data

a. Modify one piece of data

MongoCollection<Document> collection = db.getCollection("student");
 
//一个条件对象
Bson eq = Filters.eq("sname","易烊千玺");
 
//要修改的数据
Document doc = new Document();
doc.put("$set", new Document("age",22));
UpdateResult  updateone = collection.updateOne(eq, doc);
System.out.println(updateone);
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b. Modify multiple pieces of data

MongoCollection<Document> collection = db.getCollection("student");
 
//多条件
Bson bson = Filters.and(Filters.gte("age", 20),Filters.lte("age", 40));
        
//要修改的数据
Document doc = new Document();        
doc.put("$set", new Document("sex","男"));
UpdateResult updateMany = collection.updateMany(bson, doc);
System.out.println(updateMany);
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4. Query data

a. Search all

MongoCollection<Document> collection = db.getCollection("student");
 
FindIterable<Document> findAll = collection.find();
 
MongoCursor<Document> iterator = findAll.iterator();
 
while(iterator.hasNext()){
   System.out.println(iterator.next()); 
}
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b. Query with conditions

MongoCollection<Document> collection = db.getCollection("student");
 
//一个条件对象
Bson eq = Filters.eq("sname","易烊千玺");
 
FindIterable<Document> findOne = collection.find(eq);
 
MongoCursor<Document> iterator = findOne.iterator();
 
while(iterator.hasNext()){
   System.out.println(iterator.next()); 
}
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c. Fuzzy query

MongoCollection<Document> collection = db.getCollection("student");
 
//使用正则表达式进行模糊查找
Bson eq = Filters.regex("sname","易");
 
FindIterable<Document> find = collection.find(eq);
 
MongoCursor<Document> iterator = find.iterator();
 
while(iterator.hasNext()){
   System.out.println(iterator.next()); 
}
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d. Paging query

MongoCollection<Document> collection = db.getCollection("student");
 
//分页查询
FindIterable<Document> find = collection.find().skip(2).limit(3);
 
MongoCursor<Document> iterator = find.iterator();
 
while(iterator.hasNext()){
   System.out.println(iterator.next()); 
}
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e. Sorting query

MongoCollection<Document> collection = db.getCollection("student");
 
//排序查询  1升序   -1降序
Bson bson = new Document("sid",1);
FindIterable<Document> find = collection.find().sort(bson);
 
MongoCursor<Document> iterator = find.iterator();
 
while(iterator.hasNext()){
   System.out.println(iterator.next()); 
}
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