@Formula模式在休眠

我正在閱讀關於Hibernate的一些面試問題，並且遇到了Hibernate派生的屬性。我正在嘗試使用@Formula註釋的簡單示例，但它不起作用。任何人都可以告訴我我錯過了什麼。代碼片段低於@Formula模式在休眠

輸出和SQL查詢顯示在最後。

實體（Employee.java）

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.Id; 
import javax.persistence.Table; 
import org.hibernate.annotations.Formula; 

@Entity 
@Table(name="EMPLOYEE") 
public class Employee implements java.io.Serializable { 

private static final long serialVersionUID = -7311873726885796936L; 

@Id 
@Column(name="ID") 
private Integer id; 

@Column(name="FIRST_NAME", length=31) 
private String firstName; 

@Column(name="LAST_NAME", length=31) 
private String lastName; 

@Column(name="MONTHLY_SALARY") 
private float monthlySalary; 

@Formula("MONTHLY_SALARY*12") 
    private float yearlySalary; 

public Employee() { 
} 

public Integer getId() { 
    return id; 
} 

public void setId(Integer id) { 
    this.id = id; 
} 

public String getFirstName() { 
    return firstName; 
} 

public void setFirstName(String firstName) { 
    this.firstName = firstName; 
} 

public String getLastName() { 
    return lastName; 
} 

public void setLastName(String lastName) { 
    this.lastName = lastName; 
} 

public float getMonthlySalary() { 
    return monthlySalary; 
} 

public void setMonthlySalary(float monthlySalary) { 
    this.monthlySalary = monthlySalary; 
} 

public float getYearlySalary() { 
    return yearlySalary; 
} 
}

的hibernate.cfg.xml

<hibernate-configuration> 
<session-factory> 
    <property name="hibernate.dialect">org.hibernate.dialect.Oracle9iDialect</property> 
    <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property> 
    <property name="hibernate.connection.username">system</property> 
    <property name="hibernate.connection.password">system</property> 
    <property  name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:XE</property> 
    <property name="hibernate.cache.use_query_cache">false</property> 

    <property name="hibernate.jdbc.use_streams_for_binary">true</property> 
    <property name="hibernate.jdbc.batch_size">0</property> 
    <property name="hibernate.max_fetch_depth">3</property> 
    <property name="hibernate.hbm2ddl.auto">create</property> 
    <property name ="show_sql">true</property> 
    <mapping class="Employee"/> 
    <!-- <mapping class="dto.UserDetailsEmbeddedId"/>--> 

</session-factory> 
</hibernate-configuration>

Tester類 進口的org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; 公共類HibernateTest {

/** 
* @param args 
*/ 
public static void main(String[] args) { 
    // TODO Auto-generated method stub 
    SessionFactory factory = (new  Configuration()).configure().buildSessionFactory(); 
    Session session = factory.openSession(); 
    Employee employee = new Employee(); 
    employee.setFirstName("Tarun"); 
    employee.setLastName("bhatt"); 
    employee.setMonthlySalary(34000); 
    employee.setId(12); 

    session.beginTransaction(); 
    session.save(employee); 
    session.getTransaction().commit(); 
    System.out.println("salary1 = "+employee.getYearlySalary()); 
    session.close(); 
    System.out.println("salary = "+employee.getYearlySalary()); 

}

}

輸出 salary1 = 0.0 薪水= 0.0

查詢休眠：創建表EMPLOYEE（ID號碼（10,0）不null，FIRST_NAME varchar2（31 char），LAST_NAME varchar2（31 char），MONTHLY_SALARY float，主鍵（ID）） Hibernate：insert into EMPLOYEE（名字，姓氏，MONTHLY_SALARY，ID）的值（？，？，？，？）

來源

2014-03-26 Tarun Bhatt

@Formula註釋意圖（在幾個字SELECT）數據retrivial期間使用這樣的讀出和Employee看起來

select ID,FIRST_NAME,LAST_NAME,MONTHLY_SALARY,MONTHLY_SALARY*12 as yearlySalary

@Formula不工作插入或更新

來源

2014-03-26 09:01:48

@Formula模式在休眠

回答

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