Mybatis profile

1.1 What is Mybatis

• MyBatis is an excellent persistence layer framework
• It supports customized SQL, stored procedures, and advanced mapping.
• MyBatis avoids almost all JDBC code and manually setting parameters and obtaining result sets.
• MyBatis can use simple XML or annotations to configure and map native types, interfaces, and Java POJOs (Plain Old Java Objects) as records in the database.
• MyBatis was originally an open source project iBatis of apache . In 2010 this project was migrated from apache software foundation to google code and renamed as MyBatis.
• Migrated to Github in November 2013.

How to get Mybatis?

• maven repository:

  <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
  <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.2</version>
  </dependency>
  

• Github ： https://github.com/mybatis/mybatis-3/releases

• Chinese document: https://mybatis.org/mybatis-3/zh/index.html

1.2, endurance

Data persistence

• Persistence is the process of transforming program data in a persistent state and a transient state
• Memory: Loss after power off
• Database (Jdbc), io file persistence.
• Life: Refrigerated. Canned.

Why do you need to persist?

• There are some objects that cannot be lost.

• Memory is too expensive

1.3, persistence layer

Dao layer, Service layer, Controller layer ...

• The code block to complete the persistence
• Layer boundaries are very obvious.

1.4 Why is Mybatis needed?

• Help the programmer save the data into the database.
• Convenience
• The traditional JDBC code is too complicated. simplify. frame. automation.
• No need for Mybatis. It's easier to get started. Technology is not high or low
• advantage:
  • Easy to learn
  • flexible
  • The separation of SQL and code improves maintainability.
  • Provide mapping tags to support the mapping between object and database orm field relationship
  • Provide object relationship mapping tags to support object relationship formation and maintenance
  • Provide xml tags, support to write dynamic sql.

The most important point: many people use it!

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