Handwrite the DispatcherServlet central controller to obtain the name of the parameter parameter.getName(). The obtained name is arg0, arg1, arg2…, resulting in the failure to receive the token passed from the front end. When I logged in, it kept showing that the login had expired. I didn’t know that I had not received the token […]
Tag: let
Springboot2.x integrated lettuce connection redis cluster reports timeout exception Command timed out after 6 second(s)
Original/Zhu Jiqian Background: Recently, I was doing a stress test on a newly developed Springboot system. I found that when I first started the stress test, I could access data from the redis cluster normally. However, after a few minutes of pause, and then when I continued to use jmeter to perform the stress test, […]
Spring transaction @EnableTransactionManagement
Foreword @EnableTransactionManagement is an annotation provided by the Spring framework to enable annotation-based transaction management. By using this annotation, you can enable Spring’s automatic management of transactions, allowing you to use the @Transactional annotation on methods to declare transactions. @EnableTransactionManagement mainly has the following two attributes: mode (default is AdviceMode.PROXY): Specifies the mode of the […]
Let’s talk about toRef, toRefs, and their differences
toRef: Create a new Ref variable and convert a field of the Reactive object into a Ref variable toRefs: Create a new object, each of its fields is the Ref variable of each field of the Reactive object Tell me about toRef First define a reactive object interface Member {<!– –> id: number name: string […]
Write programs based on Spark SQL to complete simple indicators.
Table of Contents data preparation: I have prepared the data information of members of an aerospace company as the data for this project. The details are as follows: Demand indicators: In order to visualize the ratio of the number of members among cities in various provinces, the cities ranked by the number of aerospace company […]
Implementation of linked list (complete code attached at the end of the article)
The concept and structure of linked lists A linked list is a non-continuous and non-sequential storage structure in terms of physical storage structure. The logical order of data elements is realized through the pointer link order in the linked list The sequence table we learned in the previous article is stored continuously For example: The […]
Completely solve the problem of black screen or unchanged picture on Win11 lock screen interface
Problem description I don’t know what I did today. After a few operations, the picture on the lock screen interface of win11 became fixed. It used to have the effect of automatically changing the picture focused on windows, but now it is gone. Then I searched for help. After the second operation, the lock screen […]
C++: Memory management (new / delete)
Article directory 1. C/C++ memory distribution 2. Dynamic memory management method in C language: malloc/calloc/realloc/free 3. C++ memory management method 1. New/delete operation built-in types 2. New / delete operation custom type 4. operator new and operator delete functions 5. Implementation principles of new and delete 1. Built-in types 2. Custom type 6. Positioning new […]
How to find and delete duplicate rows in MySQL?
How to find duplicate rows The first step is to define what rows are duplicates. Most of the time it’s simple: some of their columns have the same values. This example uses this definition. Maybe your definition of “repeat” is very complicated and you need to make some modifications to the sql. Data samples to […]
Initial MySQL (2) (add, delete, check and modify tables)
Table of Contents Modify table CRUD (add, delete, modify, check) insert statement (add data to the table) update statement (modify data in the table) delete delete statement select statement Modify table Add column ALTER TABLE tablename ADD (column datatype [DEFAULT expr] [, column datatype] …); Modify column ALTER TABLE tablename MODIFY (column datatype [DEFAULT expr] […]