Hibernate Persistent Class

General Conventions For Hibernate Persistent Classes

The following are the main rules of hibernate persistent classes, but none of them are rigid requirements:

1. A default constructor is required for all Java classes that will be persisted.

PojoClass()
 {
  //default constructor required here
 }

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2. All classes should have an ID so your objects can easily be identified within Hibernate and the database. This attribute corresponds to a database table's primary key column.

private int id;

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3. All persistent attributes should be declared private.

private int id;
private String firstAttribute;
private String secondAttribute;
....
....
....
private String NthAttribute;

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4. A getter and setter method should be defined for each attribute.

<--------Setter--------->

public void setfirstAttribute(String a)
{
   this.attribute = a; 
}

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<--------Getter--------->

public String getfirstAttribute()
{
   return attribute;
}

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5. Non-final classes, which are the main feature of the hibernate, should always be preferred.

6. In the persistent class, implement the equals() and hashcode() methods.

Implementation Of Hibernate Persistent Classes

public class Worker {
   private int id;
   private String first; 
   private String last;   
   private int wage;  

   public Worker() {}
   public Worker(String fname, String lname, int wage) {
      this.first = fname;
      this.last = lname;
      this.wage = wage;
   }
   
   //getter for id
   public int getId() {
      return id;
   }
   
   //setter for id
   public void setId( int id ) {
      this.id = id;
   }
   
   //getter for first name
   public String getFirstName() {
      return first;
   }
   
   //setter for first name
   public void setFirstName( String first_name ) {
      this.first = first_name;
   }
   
   //getter for last name
   public String getLastName() {
      return last;
   }
   
   //setter for last name
   public void setLastName( String last_name ) {
      this.last = last_name;
   }
   
   //getter for wage
   public int getWage() {
      return wage;
   }
   
   //setter for wage
   public void setWage( int wage ) {
      this.wage = wage;
   }
}

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Frequently Asked Questions

What is a ClassLoader?

In Java, a classloader is a Java Virtual Machine component responsible for loading class files when a program is executed. ClassLoader is the first to load the executable file.

What are the differences between Heap and Stack Memory in Java?

The stack is commonly used to record the order of method execution and local variables. Heap memory, on the other hand, is utilized to store objects. They employ dynamic memory allocation and deallocation after storing.

What is a Marker Interface?

In Java, an empty interface is known as a Marker interface. Some well-known Marker Interface examples are Serializable and Cloneable.

Conclusion

This blog discussed the Hibernate Persistent classes in Java, its conventions, and properties. We also checked out an example implementing hibernate persistent class attributes in Java.

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