Programmer Think

The code is placed directly in the Github repository[ https://github.com/Damaer/Mybatis-Learning/tree/master/mybatis-06-resultMap ], it can be run directly, so it doesn't take up space.Many times, we have such requirements. The field name of the database is inconsistent with the attribute name of the entity class. What do we need to do at this ...

The code is placed directly in the Github repository[ https://github.com/Damaer/Mybatis-Learning ], it can be run directly, so it doesn't take up space.1. #{} placeholder2. ${} splice3. #{} and ${} difference1. #{} placeholder1. #{} placeholders can be used to set parameters. If the basic type is passed in, that is (string,long,double,int,boole ...

When we get the upper point and fully test the upper point, the goal of the test is to get the confirmed information. It can display the database information we want, all table information, all field information, and even the permission of the background manager. In this article, we will solve this problem Use the upper point to explode the li ...

Certification process analysis 3.1 login process analysis To understand the spring security authentication process, we must first understand the three basic components related to it: AuthenticationManager, ProviderManager and AuthenticationProvider. At the same time, we should also understand the filter of access authentication functio ...

I've been watching Vue videos in recent days. I've watched the video of dark horse. It's very miscellaneous. I already have the basic knowledge of Vue, Webpack, VueUi framework Wait, it's messy, and it's very laborious to learn, and I don't know yet. The API behind the video has expired (I know it only after going to the official). I can only l ...

1, Shallow clone In shallow cloning, if the member variable of the prototype object is a value type, a copy will be copied to the cloned object; If the member variable of the prototype object is a reference type, copy the address of the reference object to the clone object, that is, the member variables of the prototype object and the clone ob ...

1, Introduction to MDC MDC (Mapped Diagnostic Contexts) maps diagnostic contexts. This feature is a function provided by logback to facilitate logging under multi-threaded conditions. Some applications use multithreading to process requests from multiple users. During the use of a user, there may be multiple different threads to process. A typ ...

Dynamic memory management Significance of dynamic memory allocation Introduction to dynamic memory function mallocfreecallocrealloc Common dynamic memory errors Several classic written test questions Flexible array Significance of dynamic memory allocation We have pointed out the way of memory development: //Open up four bytes of ...

1: RDD operator RDD operators, also known as RDD methods, are mainly divided into two categories. Conversion operator and action operator. 2: RDD conversion operator According to different data processing methods, the operators are divided into value type, double value type and key value type 2.1: map value conversion package com.atg ...

Analysis of algorithm design principle Quick sort is an improvement on bubble sort. The basic idea of quick sort is to divide the data to be sorted into two independent parts through one-time sorting, in which all the data in one part is smaller than all the data in the other part, and then quickly sort the two fractional data respectively acc ...