What is ssm?

ssm, the full name of Spring SpringMVC MyBatis, is currently a mainstream Java EE enterprise-level framework and is suitable for building various large-scale enterprise-level application systems. SSM can also refer to "soft systems methodology", which is a qualitative research technology that uses systems thinking to solve non-system problems.

ssm's full name is Spring SpringMVC MyBatis. It is the current mainstream Java EE enterprise-level framework after SSH and is suitable for building various large-scale enterprises. level application system.

Introduction to the three SSM frameworks

Introduction to Spring

Spring is an open source Framework, Spring is a lightweight Java development framework that emerged in 2003. It is derived from some of the concepts and prototypes expounded by Rod Johnson in his book Expert One-On-One J2EE Development and Design. It was created to solve the complexities of enterprise application development. Spring uses basic JavaBeans to accomplish things that were previously only possible with EJBs. However, Spring's uses are not limited to server-side development. Any Java application can benefit from Spring in terms of simplicity, testability, and loose coupling. Simply put, Spring is a lightweight Inversion of Control (IoC) and Aspect-Oriented (AOP) container framework.

Advantages of spring:

A. Through Spring’s IOC feature, the dependencies between objects are controlled by Spring, which facilitates decoupling and simplifies development.
　B. Through Spring’s AOP features, it is easy to control transactions, logs, and permissions.
　C. Provides integrated support for other excellent open source frameworks.
D. Low intrusion.

Introduction to Spring MVC

Spring MVC is a follow-up product of Spring Framework and has been integrated into Spring Web Flow. The Spring features it natively supports make development very easy. Simple and standardized. Spring MVC separates the roles of controllers, model objects, dispatchers, and handler objects, making them easier to customize.

Advantages of SpringMVC

A. springMVC is a lightweight web framework that uses MVC design ideas to decouple the web layer, making our development simpler.
　B. Seamless connection with Spring.
C. Flexible data validation, formatting, and data binding mechanisms.

Introduction to MyBatis

MyBatis was originally an open source project iBatis of apache. In 2010, this project was moved from apache software foundation to google code and renamed MyBatis. MyBatis is a Java-based persistence layer framework. The persistence layer framework provided by iBATIS includes SQL Maps and Data Access Objects (DAO). MyBatis eliminates almost all JDBC code and manual setting of parameters and retrieval of result sets. MyBatis uses simple XML or annotations for configuration and original mapping, mapping interfaces and Java POJOs (Plain Old Java Objects, ordinary Java objects) into records in the database. It can be understood that MyBatis is a framework used to help you manage data additions, deletions, modifications and queries.

Advantages:

a. SQL is written in xml files, which facilitates unified management and optimization and decouples SQL and program code.

b. Provide mapping tags, support mapping between objects and database ORM field relationships, support object relationship mapping tags, and support the establishment of object relationships.

c. Provide xml tags and support writing dynamic sql. .

Disadvantages:

a. The workload is large, especially when the table has many fields and related tables.

b. The writing of sql statements depends on the database , poor portability.

c. Cascade deletion and cascade update are not supported. You need to delete the table yourself.

Integrated analysis

A. spring MVC + spring mybatis is a standard MVC design pattern that divides the entire system into display layer, Controller layer, Service layer, and DAO Layer 4

Use Spring MVC to be responsible for request forwarding and view management

Spring implements business object management, and mybatis serves as the persistence engine for data objects.

B. Spring is an open source framework. Spring is a lightweight inversion of control (IoC) and aspect-oriented (AOP) container framework, which can also better integrate other frameworks.

C. The Spring MVC framework has an MVC framework that well separates data, business and presentation by implementing the Model-View-Controller pattern.

D. MyBatis is a persistence layer framework based on Java

Extended information

ssm can also refer to "soft system" Methodology”.

Soft Systems Methodology (SSM, Soft Systems Methodology) is a qualitative research technology that uses systems thinking to solve non-system problems. It is mainly used to solve problems that contain a large number of social, political and human factors. Obviously, SSM is very different from those methods that are characterized by professional technical means to solve various "hard" problems.

SSM applies systems thinking to the real practical activities of human society. At the same time, it also recognizes that human social organization is a complex system. Therefore, it can be said that SSM is a very effective way to explore the complex human society and solve the various messy "non-technical" problems it faces.

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