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1. What is a business? Database transaction is simply to operate several different SQL statements as a whole, either all successful or all failed. It has four characteristics: atomicity, consistency, isolation and persistence. Spring transaction is a transaction processing mechanism encapsulated in database transaction. It has two manageme ...

springboot: common annotations 1, spring common annotations Package scanning + Component annotation @Component: Refers to various components @Controller,@Service,@Repository Can be called@Component. @Controller: Control layer @Service: Business layer @Repository: Data access layer selector @Conditional，Only when the specified condit ...

1, Introduction to spring MVC **Learn the pre knowledge of spring MVC: * * basic knowledge of Java Web, java,Srping, HTML,CSS,JavaScript and database 1. What is MVC MVC is an idea of software architecture, which divides software according to model, view and controller M: Model, the model layer, refers to the JavaBean in the project, whi ...

Practical skills of Spring and SpringBoot development Links SpringBoot knowledge column: https://blog.csdn.net/qq_37248504/category_10924414.html Spring knowledge column: https://blog.csdn.net/qq_37248504/category_10924424.html Back end development knowledge column: https://blog.csdn.net/qq_37248504/category_9699519.html Get Applica ...

1. Scheduled task A program executed at a specified time. Usage scenario Data analysisData cleaningSystem service monitoring 2. Synchronous and asynchronous Synchronous call The program is executed in sequence according to the code sequence, and each line of program must wait for the execution of the previous line of program before executi ...

IOC concept and principle IOC concept IOC (Inversion of control) The process of creating and calling objects is handed over to Spring for managementPurpose of using IOC: reduce coupling IOC entry case: https://blog.csdn.net/CherryChenieth/article/details/123043600?spm=1001.2014.3001.5501 IOC underlying principle: xml parsi ...

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. ...

1, Foreword In this blog, we mainly introduce the prepareBeanFactory method, the initialization preparation of the bean factory, setting some attribute values of the bean factory, which interfaces to ignore, which beans to register, and which bean post processors to set, etc. Next, let's look at the specific source code analysis, and here we a ...

   students, today let's learn about generics in Java. Generics are widely used in object-oriented programming and various design patterns. Generic concept    generic, i.e. "parameterized type". When referring to parameters, the most familiar thing is that there is a formal parameter when defining the method, ...

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