当hibernate必须是表的主键时，如何使用休眠生成自定义ID

谢谢大家的回答……最后，我在Department类中做了一些更改，并使用了一个类来生成IDs ....这是我的代码

@Entitypublic class Department {@Id@GenericGenerator(name = "sequence_dep_id", strategy = "com.xyz.ids.DepartmentIdGenerator")@GeneratedValue(generator = "sequence_dep_id")  @Column(name="Department_Id")private String deptId;@Column(name="Department_Name",unique=true,nullable=false)private String deptName;@Column(name="Department_Description")@NotNullprivate String deptDesc;//getters and setters

DepartmentIdGenerator.java

package com.xyz.ids;import java.io.Serializable;import java.sql.*;import org.hibernate.HibernateException;import org.hibernate.engine.spi.SessionImplementor;import org.hibernate.id.IdentifierGenerator;public class DepartmentIdGenerator implements IdentifierGenerator{    @Override    public Serializable generate(SessionImplementor session, Object object) throws HibernateException {        String prefix = "DEP";        Connection connection = session.connection();        try { Statement statement=connection.createStatement(); ResultSet rs=statement.executeQuery("select count(Department_Id) as Id from demo.Department"); if(rs.next()) {     int id=rs.getInt(1)+101;     String generatedId = prefix + new Integer(id).toString();     System.out.println("Generated Id: " + generatedId);     return generatedId; }        } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace();        }        return null;    }}