Programmer Think

1. AOP Concepts Official Interpretation: AOP (Aspect-Oriented Programming) is a technology that dynamically and uniformly adds functionality to a program without modifying its source code through precompilation and run-time dynamic proxies.It is a new methodology and a complement to traditional OOP programming.OOP is concerned with dividing req ...

There are two related concepts in Hyperledger Fabric: Private Data and Transient Data. This paper provides four example programs, which correspond to the four combinations of Private Data and Transient Data. By observing the transactions of account books and the world state database, we can understand why Transient Data should be used as input ...

Catalog 1, Object.c 2, JVM? Clone 3, Shallow copy and deep copy 4, ObjectSynchronizer 1,FastHashCode / identity_hash_value_for 2,get_next_hash 3,inflate / inflate_helper 4,omAlloc / omRelease / omFlush 5,InduceScavenge / deflate_idle_monitors / deflate_monitor / walk_monitor_list 6,wait / n ...

Previous tutorial Main contents of this issue 1, Perfect what you didn't notice before. Set the mouse movement event before, and forget to modify the mouse click event Add the code in the original place 2, Understand the configuration file of this model file and configure it according to your own need ...

I'm new to Web applications and servlets, and I have the following questions: Whenever I print something in the Servlet and the web browser calls it, it returns a new page containing that text. Is there a way to print text on the current page using Ajax? #1 building I'll show you the entire example of a servlet and the way ajax calls ...

After the epidemic happened, almost all the people of the whole country obeyed the call to isolate themselves at home. However, there are such a group of people, called "retrograders", who are the medical staff from all provinces of the country who went to Hubei to support them. They rushed to ...

ObjectMapper class of Jackson Library Seems thread safe . Does this mean that I should declare my ObjectMapper as a static field like this? class Me { private static final ObjectMapper mapper = new ObjectMapper(); } Instead of instance level fields like this? class Me { private final ObjectMapper mapper = new ObjectMapper(); ...

1. Content Review Object-oriented Class variable Method : Static method Class method : Binding method : Attribute property Singleton Module Singleton module: design mode Singleton scenarios _u new_u(self): Instance creation, working before init logging module Logged Logging errors, operation logs For programmers to see: 1 Statistical use; ...

Model ORM (relationship object mapping) 1. field AutoField(Field) # int Auto increment column, parameter must be filled primary_key=True BigAutoField(AutoField) # bigint Auto increment column, parameter must be filled primary_key=True //If there is no auto increment column in the model, a column named id will b ...

Query Background There is a table, tmp_test_course Around 100,000 records, and then a json field, outline, that holds a one-to-many relationship (multiple codes, such as jy15776881775) We need to retrieve specific types of data in this 100,000 data set, with a total target of 2,931 SELECT COUNT(*) FROM tmp_test_course WHERE `type`=5 AND del=2 ...