我正在开发一个使用JPA/Hibernate和遗留数据库的web应用程序。下面的表使用underlying_id和value_date作为组合键,其中underlying_id也是外键
CREATE TABLE `underlying_settle_value_table` (
`underlying_id` varchar(250) NOT NULL,
`value_date` date NOT NULL,
`settle_value` double NOT NULL,
`risk_free_rate` double NOT NULL,
`div_yield` doubl
我使用Hibernate,有两个表,STUDENTS和DORM_ROOMS,这两个表与一个组合键相关:
STUDENTS table:
CAMPUS(String) Part of Composite Key
STUDENT_ID (int) Part of Composite Key
NAME (String)
...
DORM_ROOMS table:
CAMPUS(String) Part of Composite Key
STUDENT_ID (int) Part of Composite Key
ROOM_NUMBER(int)
...
这种关系是一
我在使用Hibernate 4的Spring3Web应用程序上遇到了以下异常:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in URL [file:war/WEB-INF/datasource-config.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationExcepti
下面是详细信息,但简短的版本是:我在一个名为user_id的PostgreSQL表上有一个列config。该列使用@Column(name = "user_id")引用,但当服务器启动时,无法生成EntityManagerFactory,因为:
Caused by: org.hibernate.HibernateException: Missing column: userId in public.config
at org.hibernate.mapping.Table.validateColumns(Table.java:366)
at org.hibern
我确实需要根据某种条件从三个不同的表中获取数据。例如:
@Entity
class Order{
id;
type;
typeId;
@Join with boqTable to get the Boq Associated with if type == BOQ and id = typeId
@Join with customTable to get custom data associated if type == CUSTOM and id = typeId
}
我应该能够使用Order实体插入和更新子表。如何使用JPA/Hibernate..。我搜索了
我创建了一个简单的类和一个简单的数据库表来测试hibernate的概念。这个类被命名为"Employee":
public class Employee {
private String firstName;
private String lastName;
private int salary;
public Employee(String fname, String lname, int salary) {
this.firstName = fname;
this.lastName = lname;
t
我的表格是:
sid fname lname subject phno
--- ----- ----- -------- -----
1 vvk v math 4444
1 vvk v read 4444
2 hari h math 5555
2 hari h read 5555
3 kalyan k math 6666
3 kalyan k re