Mybatis essay notes

Fundamentals

• ORM:object-relation-Mapping
• Table - Class / Properties - Column / Object - OK
• Mapping file with the alternate code / modify the configuration file / files modify properties
• Generator command
• Support for custom SQL, eliminating all manual settings, and the result set JDBC code and parameter retrieval
• Do:
  • Reverse engineering mapping file generated Mapper
• Step Note:
  • mybatis must log4j
  • pom jar package plus support
  • mybatis.properties file
  • Reverse engineering mapping file generation Mapper

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  • Ready mybatis-Config.xml configuration file (mybatis must be used independently of the time)
  • Write test classes
  • The latter do not have more than two points

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• Mapping file corresponds to the interface implementation class
• Dao can only write CRUD
• The presence of multiple primary foreign key relationships between tables tables, classes and also the mapping class. Association class to the mapping table using the primary foreign key relationship.
• Generalization: parent-child class inherits
• Implementation: the interface between
• Dependency: A calls B, B also becomes variable A
• Association: a class holds another class as its attributes, is used to describe primary foreign key relationship

Mybatis dynamic SQL

• Inquire
  • where + if
  • choose
  • foreach
• insert
  • trim + if
• Update
  • set + if
• Delete: No

Springboot + Mybatis integration

• MVC /Controller + View +Model
• Springboot ：Controller层
• Mybatis: Dao layer