Jpa basics (5): JPA ing for field types such as date_enumeration

Enumeration class:

 
1 Public EnumGender {
2Man, woman
3}
 

Person class:

 1   Import Java. util. date;
 2  
 3   Import Javax. Persistence. column;
 4   Import Javax. Persistence. entity;
 5   Import Javax. Persistence. enumtype;
 6   Import Javax. Persistence. enumerated;
 7   Import Javax. Persistence. generatedvalue;
 8   Import Javax. Persistence. ID;
 9   Import Javax. Persistence. Table;
 10   Import Javax. Persistence. Temporal;
 11  Import Javax. Persistence. temporaltype;
 12      
 13 @ Entity
 14 @ Table (name = "persontable ")
 15   Public   Class Person {
 16 @ ID
 17 @ Generatedvalue
 18       Private Integer ID;
19 @ Column (length = 10, nullable = False , Name = "personname ")
 20       Private String name;
 21 @ Temporal (temporaltype. Date)
 22       Private Date birthday;
 23 @ Enumerated (enumtype. String)
 24 @ Column (length = 5, nullable = False )
25       Private Gender gender = gender. Man;
 26       Public Person (){}
 27       Public Person (string name ){
 28           This . Name = Name;
 29 }
 30       Public Integer GETID (){
 31          Return ID;
 32 }
 33       Public   Void Setid (integer ID ){
 34           This . ID = ID;
 35 }
 36       Public String getname (){
 37           Return Name;
38 }
 39       Public   Void Setname (string name ){
 40           This . Name = Name;
 41 }
 42       Public Date getbirthday (){
 43           Return Birthday;
 44 }
45       Public   Void Setbirthday (date birthday ){
 46           This . Birthday = birthday;
 47 }
 48       Public Gender getgender (){
 49           Return Gender;
 50 }
 51      Public   Void Setgender (gender Gender ){
 52           This . Gender = gender;
 53 }
 54 }

• @ Table (name = "persontable") // change the ing table name in the database
• Private gender Gender = gender. Man; // you can set the default value here. Gender is an enumeration type.
• @ Enumerated (enumtype. String) // It indicates that this attribute is an enumeration type. The enumerated strings in the brackets indicate the enumerated strings stored in the database rather than the enumerated indexes.
• @ Temporal (temporaltype. Date) // indicates that this property is mapped to a database as a date type, and the brackets contain the date format.

The object is created for us by hibernate. When we get an object by ID, this object is returned to us. The object is created by using the reflection technology inside hibernate, and the default constructor is used for reflection, therefore, a public non-argument constructor must be provided.