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Dynamic SQL introduce In the mapping file of Mybatis, our SQL is relatively simple. Sometimes when the business logic is complex, our SQL changes dynamically. At this time, our SQL can not meet the requirements in the previous study. The official document on dynamic SQL reference is described as follows: Previous problems Example of mult ...

Dao interface proxy Case project skeleton What is agent development? Mapper interface development needs to follow the following specifications Write StudentMapper interface Case demonstration Source code analysis Analyze how dynamic proxy objects are generated? How is the analysis method performed? Dao interface proxy Case project sk ...

Preface Now that you've vowed to be a full stack engineer, you've learned to draw PCB s, C, ESP32(WiFi) programming, Linux application programming, processes, threading, network programming, and so on, and how devices connect to the cloud platform. Now it's just a matter of mobile control, and the WeChat applet is undoubtedly the first c ...

This weekend, I'm going to take a look at another focus of Spring, transaction learning in AOP and Spring. I've written articles about transactions before, all about how to use them in my work. I'll add some basics today, try to explain the role in some straightforward words, and then sort out the interview questions I occasionally heard in the ...

RabbitMQ What is MQ MQ(message queue), in its literal sense, is essentially a queue. FIFO is first in first out, but the content stored in the queue is message. It is also a cross process communication mechanism for upstream and downstream message delivery. In the Internet architecture, MQ is a very common upstream and downstream "logica ...

1, Quick start mybatis+MP Step 1: Based on the original code, let the XXXMapper (such as UserMapper) interface inherit the BaseMapper interface, so you can use the following methods defined in BaseMapper: Note that inheriting BaseMapper requires specifying the generic type of the entity class of the operation public interface UserMappe ...

Chapter 1 JDBC overview Before that, we learned JavaSE and wrote Java programs. The data is stored in variables, arrays, sets, etc., which cannot be persisted. Later, we learned that IO streams can write data to files, but it is not convenient to manage data and maintain the relationship between data; Later, we learned the database manage ...

Learning objectives Through the analysis of source code level, understand the direct relationship between the three loaders and the understanding of parental delegation mechanism​ Introduction to class loader The design team of Java virtual machine intentionally put the binary byte stream describing a class obtained through the full class ...

In the process of programming, you will find that Java code is sometimes lengthy. Lombok provides a series of annotations to generate template code in the background and delete it from your class, which helps to keep the code clean and easier to read and maintain. The following will introduce the common annotations of Lombok to show you how to ...

What I wrote earlier: most of this article (all of it is OK) is copied, and the materials in the classroom are very good. I feel ashamed of writing, but if I don't write it, it will affect the content of the whole blog. I'll revise / write my notes later. Thank you for passing by. I hope the student's notes can give you a trivial reference (2 / ...