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prefaceMongoDB is a non relational database written in C + + language. It is an open source database system based on distributed file storage. Its content storage form is similar to JSON object. Its field value can contain other documents, arrays and document arrays, which is very flexible. In this section, let's take a look at the storage oper ...

summary Spring Security is a framework launched by spring in terms of security. It adopts the design pattern of responsibility chain and is implemented based on Spring AOP and Servlet filter. This article documents some concepts of authentication authorization and how to use it to extend and protect our applications. Concept of authentication ...

catalogue 1, What is a two-way circular linked list II Advantages and disadvantages of two-way cyclic linked list III How to create a two-way circular linked list IV Specific code 1, What is a two-way circular linked list Definition: lead two-way circular linked list: the most complex structure, which is generally used to store data sepa ...

Spring 1. Introduction to spring framework Spring, born in 2002, was created by Rod Johnson. Spring framework is an open source, lightweight project management framework that integrates many design patterns. Committed to JAVAEE lightweight solutions. Compared with the original framework, the spring framework is essentially different fro ...

1, Operator Arithmetic operators: common in mathematics +,, -, *, /,% and special + +, -. Different types of operations will take the maximum type as the output type-- It is to + 1 and - 1 by itself. Note that i + + is to + 1 after the end of operation i, and + + i is to + 1 i before operating i. public static void main(String[] args) { ...

In the last blog, we mentioned the branches and loops of C language. In this blog, I'll share the relevant knowledge of C language functions. Please open your eyes and have a good look (HA HA). When it comes to functions, the first thing we think of is mathematical functions. This very interesting and practical knowledge in the field of math ...

Background: write a dynamic library of modules and provide necessary header files and demo s. Thinking: first, make it clear that the library to be written provides several interfaces to the outside world. Read the structure of the relevant header file and the functions to be used in the library written by yourself. In the actual project deve ...

Inheritance: Extract the same content of multiple classes into another class, and then use the keyword extends to implement inheritance Benefits of inheritance: 1. Improve the reusability of the code 2. The maintainability of the code is improved. Only the content of the parent class needs to be modified 3. Create inheritance relationship ...

Chapter 7 exception handling Section 4.6 implementation of triangular_ When the iteratorclass, the iterator has potential errors, which may lead to the generation of error status. class Triangular { friend class Triangular_iterator; public: static bool is_elem(int); static void gen_elements(int length); static void gen_elems_t ...

catalogue ​ Pointer What is a pointer and what is the relationship between a pointer and memory Pointer variable Basic operation of pointer &The address represents the address of the variable, and * represents a dereference of the variable found according to the address Size of pointer variable Type of pointer variable Conclusion ...