Programming VIP

Suppose that there are five attribute values in the database, namely id,name,sex,age and hobbies. It is required that hobbies are presented in the front end in the form of array. At this time, it can be realized through JSON. At first, I thought of using JSON directly in impl, but there is a problem that there are not only hobbies, but also ID, ...

Mybatis Learn Notes I. Understanding Mybatis MyBatis is an excellent persistence framework. It supports custom SQL, stored procedures, and advanced mappings. MyBatis eliminates almost all JDBC code and setting parameters and getting result sets. MyBatis can configure and map raw types, interfaces, and Java POJO s (Plain Old Java Objects, ...

background The new project, the framework springboot + mybatis + mybatis plus, wants to add a CommonMapper and the corresponding mapper xml file to store general sql or sql across multiple tables. As a result, an error is reported when starting the test, as shown below: org.apache.ibatis.binding.BindingException: Invalid bound statement (not ...

SpringMVC First of all, let's learn about the classic MVC mode. The full name of MVC is Model View Controller. M refers to business model and data model, V refers to user interface and C refers to controller. The purpose of using MVC is to separate the implementation codes of M and V, so that the same program can use different expressions. ...

scene In the development of back-end services, the popular framework combination is SSM (SpringBoot + Spring + MyBatis). When we develop some business systems, there will be many business data tables, and the information in the tables will be inserted again, and many operations may be carried out in the whole life cycle. For example, when we ...

1. Introduction reference resources: mysql essentially uses database rollback, and the table engine needs InnoDB The versions used are as follows <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.or ...

First, what is MyBatis? MyBatis is a state-of-the-art persistence framework that supports custom SQL, stored procedures, and advanced mapping. MyBatis eliminates almost all JDBC code and manually setting parameters and retrieving results. MyBatis can use simple XML or Annotations to configure and map primitives, mapping interfaces, and Java PO ...

Mybatis brief introduction MyBatis is an excellent persistence layer framework, which supports custom SQL, stored procedures and advanced mapping. MyBatis eliminates almost all JDBC code and the work of setting parameters and obtaining result sets. MyBatis can configure and map primitive types, interfaces and Java POJO s (Plain Old Java Objec ...

What is a transaction? Transaction is to treat a series of actions as an independent unit of work, which are either completed or ineffective. Attribute ACID of transaction: 1. Atomicity: a transaction is an atomic operation consisting of a series of actions. The atomicity of a transaction ensures that the actions are either completed or inef ...

Chapter 7 MybatisPlus plug-in 1. Overview of plug-in mechanism MybatisPlusInterceptor core plug-in MybatisPlus can intercept the execution of relevant methods of four objects (Executor, StatementHandle, ParameterHandler and ResultSetHandler) through the plug-in (Interceptor), and complete the dynamic change of relevant data according to ...