Myormframeworkjdbc review and problem analysis of user-defined persistence layer framework, and thought analysis of user-defined persistence layer framework

JDBC Review and problem analysis

Design idea of custom persistence layer framework

End of use ( project )

• Introducing a custom persistence layer framework jar package
• Provides two parts of configuration information : Database configuration information 、sql Configuration information :sql sentence 、 Parameter type 、 The return value type uses the configuration file to provide these two parts of configuration information :
  • sqlMapConfg.xml: Store database configuration information , Deposit mapper.xml The full path of
  • mapper.xml: Deposit sql Configuration information

Customize the persistence layer framework itself ( engineering )

The essence is right JDBC The code is encapsulated

1. Load profile : According to the path of the configuration file , Load configuration file into byte input stream , Stored in memory

establish Resources Class method :InputSteam getResourceAsSteam(String path)

2. Create two javaBean:( Container object )∶ What is stored is the content parsed from the configuration file

Configuration: Core configuration class : Deposit sqIMapConfg.xml What's coming out of it
MappedStatement: Mapping configuration class : Deposit mapper.xml What's coming out of it

3. Parse configuration file : dom4j

Create a class :SqlSessionFactoryBuilder Method :build(InputSteam in)
First of all : Use dom4j Parse configuration file , Encapsulate the parsed content into the container object
second : establish SqlSessionFactory object ; production sqlSession : Conversation object ( Factory mode )

4. establish SqlSessionFactory Interface and implementation class DefaultSqISessionFacotry

openSession(): production sqlSession

5. establish SqlSession Interface and implementation class DefaultSession

Define the database crud operation : selectList()
selectOne()
update()
delete()
insert()

6. establish Executor Interface and implementation class SimpleExecutor Implementation class

query(Confguration,MappedStatement,Object… params): What we're doing is JDBC Code

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