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This article mainly explains "how to understand the date attribute of springboot pojo object". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to understand the date attribute of springboot pojo object".

Catalogue

Pojo object date property

Pojo default settings

Pojo Settings (recommended)

Pojo object date property

The FeignClient date property is maintained with pojo, using the Date type

The value of the pojo attribute is annotated JsonFormat, and the property obtained by the front end is the formatted value.

@ JsonFormat (timezone = DateUtils.TIMEZONE, pattern = DateUtils.DATE_TIME_FORMATE) private Date date;pojo default setting

We sometimes need to set default values for POJO

Pojo Settings (recommended)

1 、 User

Package com.xxx.firstboot.domain;import lombok.Getter;import lombok.Setter;@Getter@Setterpublic class User {private int id; private String username = ""; / / set default value private String password = ""; / / set default value}

2 、 UserController

@ ApiOperation ("add user / test POJO defaults") @ RequestMapping (value= "/ addUserWithNoParam", method=RequestMethod.POST) public boolean addUserWithNoParam () {return userService.addUserWithNoParam (new User ()); / / only new, no value}

3 、 UserService

Public boolean addUserWithNoParam (User user) {return userDao.insertUserWithUserParam (user) > zero true false;}

4 、 UserDao

Public int insertUserWithUserParam (User user) {return userMapper.insertUserWithUserParam (user);}

5 、 UserMapper

Insert ("INSERT INTO tb_user (username, password) VALUES (# {username}, # {password})") public int insertUserWithUserParam (User user)

Testing: viewing database

If the database also sets the default value, as follows

Execute the above procedure again, and find that the result is the same as above, because although we did not pass the values of username and password of pojo, the default value is set to "" in the User class. In this case, when it is transferred to the database, username is not actually null, then the default value of mysql will not be used.

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