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MyBatis Advanced mapping/association queries: One-to-one/many-to-one One to many Many to many The main usage is the collection attribute and association attribute of resultMap. association Association: Used for mapping the information of association query to a single object, mapping the information of association query to a pojo object, ...

9. spring bean Foundation (1) This article mainly explains the following knowledge points. 1. An example of using bean s in spring 2. Injecting values to bean properties 3. Loading multiple configuration files 4. Example of spring internal bean s 5. Scope of spring bean s 1. An example of using bean s in spring Referencing bean s unde ...

Main points: HttpSession: The establishment of a session starts with a user sending the first request to the server, and ends with an explicit end of the user or session timeout. With session, user status can be recorded in a certain time. 2.ModelAndView: You can either set the URL address or render the view. 3. Handler Interceptor: The inte ...

Today's edition will share with you an article about the pit encountered when nodejs synchronous invocation acquires mysql data. It is very comprehensive and meticulous. It has a certain reference value. Friends who need it can refer to and learn from it. If there are any shortcomings, criticism and correction are welcome. mysql calls to get d ...

Bullshit does not say much directly on the code "novice on the road God do not spray!" 1 First, you need to build a Springboot project. I won't show you how to build it. 2. Configure two data sources in the configuration file 3. Setting up two config classes import org.apache.ibatis.session.SqlSessionFactory ...

3.4 Scope of Bean s What is scope? In object-oriented programming, "scope" generally refers to the visible range between objects or variables. In Spring containers, it refers to the visibility of the Bean objects it creates relative to the requests of other Bean objects. Spring provides two basic scopes of "singleton" an ...

The processor interceptor of Spring Web MVC is similar to the Filter filter Filter in Servlet development, which is used to preprocess and post-process the processor. Interceptor application scenarios: 1. Logging: Logging requests for information for information monitoring, information statistics, computing PV (Page View), etc. 2. Privilege ...

The ps command in Linux is the abbreviation of Process Status. The ps command lists the processes currently running in the system. The ps command lists snapshots of the current processes, which are those processes at the time of execution of the ps command. If you want to dynamically display process information, you can use the top command. T ...

Additional operations on single tables Earlier we saw how to build mybatis framework and query operations, here we talk about how to use mybatis to increase user operations. First, insert method is added to user.xml file. The code is as follows <!-- Add user --> <insertid="insertUser"parameterType="cn.itcast.mybatis.po.User ...

What is Load Balancing Load Balance, which is called Load Balance in English, refers to a set of servers composed of multiple servers in a symmetrical manner. Each server has an equivalent status, and can provide services independently without the assistance of other servers. Through some load-sharing technology, requests sent from out ...