Hibernate ID Generation policy configuration

1.student.hbm.xml Configuration

Uuid
Uses a 128-bit UUID algorithm to generate identifiers of type String that's unique within a network (the IP address is U SED). The UUID is encoded as a string of hexadecimal digits in length.

The ID must be of type string. Finally, the ID generated in MySQL is a varchar type.



 
  

  
  
  
 
   
   native 
  
  
 
 
  

  
   

   
Selects identity , sequence or hilo depending upon the capabilities of the underlying database.
   

  
   

  
   

   

   

  
   

   
2.Annotation Configuration _identity_sequence
   

  
   

   

   

  
   
@Id @generatedvalue (strategy=generationtype.identity) public int getId () {return Id;}
  
   

   

   

  
   

   


   

  
   

   
Sequence generator, using the Oracle database.
   

  
   

   
@SequenceGenerator ( name= "Teacherseq", Sequencename= "teacherseq_db") added in front of class
   

  
   

   

   

  
   

   
@GeneratedValue(strategy=generationtype.sequence,generator="Teacherseq") added before the method
   

  
   

   


   
3.TableGenerator (cross-database platform)
  
   

   
@javax. Persistence.tablegenerator (
   

  
   

   
Name= "Teacher_gen",
   

  
   

   
Table= "Generator_table",
   

  
   

   
Pkcolumnname= "Pk_key",
   

  
   

   
Valuecolumnname= "Pk_value",
   

  
   

   
Pkcolumnvalue= "Teacher",
   

  
   

   
Allocationsize=1
   

  
   

   
)
   

  
   

   


   

  
   

   
Student.hbm.xml
   

  
   

   

   

  
   
<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "Http://www.hibernate.org/dtd/hiberna Te-mapping-3.0.dtd ">
  
Teacher.hbm.xml
  

  

  
<?xml version= "1.0" encoding= "UTF-8"?
><! DOCTYPE hibernate-mapping public     "-//hibernate/hibernate mapping DTD 3.0//en"    "Http://www.hibernate.org/dtd /hibernate-mapping-3.0.dtd ">
  

  


 
  
 
 Hibernate ID Generation policy configuration