2

20210609

Focus

Static method

A method is called, what is the return value of the method?

Who called the method and in which class

How to jump between methods

What do the three values in the new cycle represent


Who passed the request from the front end, who accepted it, and how to respond

The value of the name attribute in the front-end page needs to correspond to what attribute on the server side

When inserting data, the 3 question marks in precompilation are assigned to set

When getting data, what does 1234 mean? Get the value

When getting the Emp object, there is an attribute value of null, what is the reason

When doing a database query, check it all, why the return value type is ArrayList


What does JDBC do

Hierarchical structure

What is precompilation

What is SQL injection


I understand for the time being, I will come back later

What annotations have you all learned now and what meanings they represent

20210611

Focus

Create SpringBoot project, import jar package, write configuration file

Mybatis annotation

  • @Mapper
  • @Options
  • @Result
  • @Results
  • @ResultMap
  • @Select
  • @Delete
  • @Update
  • @Insert

    SQL statements in the form of Mybatis annotations

    Front-end to database execution process

    Test class in SpringBoot project

    What is synchronous and what is asynchronous

    How to use axios

    How to hand over the class to Spring to manage

    How to inject objects into references


李三岁
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