Programmer Think

Dynamic SQL Official documents: https://mybatis.net.cn/dynamic-sql.html What is dynamic SQL: dynamic SQL refers to generating different SQL statements according to different query conditions. The SQL statements we wrote before are relatively simple. If there are complex businesses, we need to write complex SQL statements, which often ne ...

SpringBean container: Beans are java objects. The container is responsible for the management of the whole life cycle of java objects, including creation, modification and destruction IOC control reversal IOC: it's an idea IOC container: the implementation container of IOC thought DI One of the ways to implement IOC, dependency injection, is ...

Mybatis actual combat Tip: you can add the directories of all articles in the series here. You need to add the directories manually For example: the first chapter is the use of pandas, an introduction to Python machine learning Tip: after writing the article, the directory can be generated automatically. For how to generate it, please refer ...

The last one was "Spring Boot - custom Banner pattern", and this one is "smoother MyBatis". MyBatis's strength comes from its vast ecology and the support of many large domestic factories. - the plass are gone From iBatis to MyBatis, and then to many peripheral tools typically represented by MyBatis Plus in domestic tea ...

Spring Bean management xml based configuration mode bean configuration requires spring managed classes id generated object name Class full class name name object alias, which can be multiple scope: Singleton (default): there is only one bean instance in Spring, singleton mode Prototype: when the prototype getBean(), new Bean() Request: each h ...

You know how to go to the town building map first 1, Introduction 2 1.1 research background 2 1.2 research purpose and Significance 2 1.3 research contents 3 1.4 feasibility study design 3 1.5 social feasibility 4 1.6 relevant technical description 4 spring 4 Spring 5 jQuery 5 Mysql 6 1) Powerful 6 2) Support cross platform 6 3) ...

1, SQL label of mapping file There are 9 top-level sql tags in the remapping file: SQL splicing and operation: select, delete, update, insert, sql (include) Cache: cache, cache ref Parameter mapping: parameterMap (this label has been abolished. For parameter mapping, in-line parameter mapping can be used) Solution map: resultMap   1. OGN ...

Introduction to off the shelf tools MyCat Active and good performance open source database middleware. It is a transparent database agent, which needs to ensure the high availability of services in the production environment. ShardingSphere ShardingSphere is composed of JDBC, Proxy and Sidecar (under planning), which can be deployed indepen ...

 19.  19. One to one and one to many association queries?     <mapper namespace="com.lcb.mapping.userMapper"> <!--association One to one association query --> <select id="getClass" parameterType="int" resultMap="ClassesResultMap"> select * from class c,teacher t where c.teacher_id=t.t_id ...

  Article catalogue catalogue Article catalogue 1, What is Spring 2, Advantages of Spring framework   3, Detailed explanation of spring IOC mechanism   IOC role summary Detailed explanation of spring IOC mechanism 1, First build maven project and add dependencies 2, Create persistence layer and implementation class 3 ...