我已经编写了自己的IdGenerator:
public class AkteIdGenerator implements IdentifierGenerator {
public Serializable generate(SessionImplementor session, Object object)
throws HibernateException {
// if custom id is set -> use this id
if (object instanceof SomeBean) {
SomeBean someBean = (SomeBean) object;
Long customId = someBean.getCustomId();
if (customId != 0) {
return customId;
}
}
// otherwise --> call the SequenceGenerator manually
SequenceStyleGenerator sequenceGenerator ...
}
}
有谁知道我怎么能从生成器类中调用sequenceGenerator,通常我可以为每个注释定义什么:
@GeneratedValue(
strategy = GenerationType.SEQUENCE,
generator = "MY_SEQUENCE")
@SequenceGenerator(
allocationSize = 1,
name = "MY_SEQUENCE",
sequenceName = "MY_SEQUENCE_NAME")
我将非常感谢您提供任何解决方案!!!!
非常感谢,诺伯特
最佳答案
您可以从Generator类轻松调用SequenceGenerator。通过编写此代码。
自定义生成器类应为
public class StudentNoGenerator implements IdentifierGenerator {
public Serializable generate(SessionImplementor session, Object object)throws HibernateException {
SequenceGenerator generator=new SequenceGenerator();
Properties properties=new Properties();
properties.put("sequence","Stud_NoSequence");
generator.configure(Hibernate.STRING, properties, session.getFactory().getDialect());
return generator.generate(session, session);
}
}
在上面的代码中,Stud_NoSequence是序列名称,应创建该序列名称。在数据库中拧
create sequence Stud_NoSequence;
Hibernate.String是SequenceGenerator类将返回的类型。和域类将是
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
@org.hibernate.annotations.GenericGenerator(
name = "Custom-generator",
strategy = "com.ssis.id.StudentNoGenerator"
)
public class Student {
@Id @GeneratedValue(generator = "Custom-generator")
String rno;
@Column
String name;
public String getRno() {
return rno;
}
public void setRno(String rno) {
this.rno = rno;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
关于java - hibernate :手动调用SequenceGenerator?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/5388573/