Framework construction: (two java classes, two xml configuration files)
1. Import the jar package, log debug file and database parameter file
2. Create a persistent class (the same class as the column value of the database)
An extension of the user class:
userQueryVo is a wrapper class for UserCustom:
3. Create a mapper and the corresponding .java file
UserMapper.java file:
userMapper.xml
The key value can be returned when inserting:
Note that the writing in mapper should correspond to the interface
4. Create a core xml configuration file (configuration environment configuration mapper)
5. Create a test class (get sqlsession for operation)
Organize the idea map: (important!)
