Hibernate 通过 SEQUENCE 生成主键
作者:互联网
– Start
对于 Oracle 数据库来说,通过我们通过 SEQUENCE 生成主键。
package shangbo.hibernate.demo007;
public class App {
public static void main(String[] args) throws Exception {
DataService dataService = new DataService();
dataService.saveCustomer(new Customer("test"));
}
}
package shangbo.hibernate.demo007;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import org.hibernate.annotations.Type;
@Entity
@Table(name = "CUSTOMER")
public class Customer {
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator="customerId-generator")
@SequenceGenerator(name="customerId-generator", sequenceName="CUSTOMER_ID_SEQ")
@Column(name = "CUSTOMER_ID")
// @Type(type = "int")
private Integer customerId;
@Column(name = "CUSTOMER_NAME")
// @Type(type = "string")
private String customerName;
public Customer() {
}
public Customer(String customerName) {
this.customerName = customerName;
}
public Integer getCustomerId() {
return customerId;
}
// 主键自动生成,无需 setter 方法
// public void setCustomerId(Integer customerId) {
// this.customerId = customerId;
// }
public String getCustomerName() {
return customerName;
}
public void setCustomerName(String customerName) {
this.customerName = customerName;
}
}
package shangbo.hibernate.demo007;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
public class DataService {
public void saveCustomer(Customer customer) {
// 第一步:构造 ServiceRegistry
StandardServiceRegistry registry = new StandardServiceRegistryBuilder().configure(ClassLoader.getSystemResource("shangbo/hibernate/demo007/hibernate.cfg.xml")).build();
// 第二步:构造 Metadata
Metadata metadata = new MetadataSources(registry).buildMetadata();
// 第三步:构造 SessionFactory
SessionFactory sessionFactory = metadata.buildSessionFactory();;
// 操作数据库
Session session = sessionFactory.openSession();
session.beginTransaction();
session.save(customer);
session.getTransaction().commit();
session.close();
// 关闭 SessionFactory
sessionFactory.close();
}
}
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
<property name="connection.username">hr</property>
<property name="connection.password">456789</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.Oracle12cDialect</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">create</property>
<mapping class="shangbo.hibernate.demo007.Customer"/>
</session-factory>
</hibernate-configuration>
– 更多参见:Hibernate 精萃
– 声 明:转载请注明出处
– Last Updated on 2019-06-15
– Written by ShangBo on 2019-06-15
– End
标签:Hibernate,javax,customerName,SEQUENCE,主键,hibernate,org,import,public 来源: https://blog.csdn.net/shangboerds/article/details/92072989