I encountered a bug that has not been resolved by scratching the earplug for a long time. It is necessary to record it.
Now I use a multi-dimensional list.
IListint>> list = new Listint
Tag: Medium
MySQL – Implement the hierarchical data structure in the database
I know there are two methods: adjacency list and nested tree. It is said that due to a large number of queries, the adjacency list will be slow to traverse. But I don’t know any actual numbers in t
Personal understanding of value types and reference types in C #
In addition to ultimately inheriting from Object, value types also inherit from ValueType
Value types inherit from ValueType, and ValueType inherits from Object. (All types in c# ultimately i
Can the alliance initialize in the statement?
For example, suppose we have a union
typedef union {
unsigned long U32;
float f;
}U_U32_F; Is there any way to set the initial value when declaring this union type variable?
U_U32_F u
Modify a single XML attribute in C #
I have written the XML document very well, it will look like this
I I’m trying to find a way to access the “class” attribute of a single character and modify it. So far, I have reached the po
Handling the best practices for processing a string in the VC?
Since I am new to Visual C, there are many types of strings that can be processed. When I use a certain type and continue to code, but in the next step, there are other types of built-in functions
How to handle null values in WHERE IN conditions in mysql
I want to include the possible values as null in the conditions of the mysql query.
This is my query: but it doesn’t show any values. Please suggest me how to write WHERE IN The condition contai
How to manage Java certificates in a distributed Jenkins build environment?
I have a Jenkins server, which rotates nodes as the build traffic increases. I am trying to run integration tests with a project, and it requires me to have a certificate generated by keytool to co
Symfony – How do I handle custom SQL functions in architecture updates?
Sometimes, when you are looking for performance, you need to use some complexity functions and triggers to delegate some responsibilities to the database. I want to know that when you call the doct
Retrieve all product IDs associated with directory price rules in Magento
I need a way to retrieve the product ID associated with a catalog price rule promotion (for example, 50% of the price of all items in the BICYCLES category). I want to do this without having to tra