Hibernate配置(通过注解配置)

package com.jazz7.entity;import java.util.Date;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToOne;import javax.persistence.SequenceGenerator;import javax.persistence.Table;import javax.persistence.Transient;// 1.注册bean@Entity// 2.和数据库表进行关联，如果名字不同的话，需要在这里指定name@Tablepublic class Emp { ???// 3.配置id ???@Id ???//4.配置主键生成策略 ???@GeneratedValue(generator="empgener",strategy=GenerationType.SEQUENCE) ???//配置序列 ???@SequenceGenerator(name="empgener",sequenceName="seq_emp_id",allocationSize=1,initialValue=1) ???private int empno; ???private String ename; ???private String job; ???private Integer mgr; ???????private Date hiredate; ???private float sal; ???private Float comm; ???//多对一关联 ???@ManyToOne(targetEntity=Dept.class) ???//配置外键 ???@JoinColumn(name="deptno") ???private Dept dept; ???// ......省略get()set()}

@Entity@Tablepublic class Dept { ???@Id ???@Column ???private int deptno; ???private String dname; ???private String loc; ???????//一对多配置 ???@OneToMany(mappedBy="dept") ???private Set<Emp> emps; ???// ...省略get()set()}

@Entity@Table(name = "tbl_student")public class Student { ???@Id ???@Column ???@GeneratedValue(generator = "stname", strategy = GenerationType.SEQUENCE) ???@SequenceGenerator(name = "stname", sequenceName = "seq_student_id", allocationSize = 1, initialValue = 1) ???private int sid; ???private String sname; ???// 多对多配置 ???@ManyToMany(targetEntity=Teacher.class,mappedBy="students") ???//配置“关系表”，joinColumns是“本类”在关系表中的外键，inverseJoinColumns是相关联类在关系表中的外键 ???@JoinTable(name = "tbl_teacher_student", ?joinColumns ={@JoinColumn(columnDefinition="sid")}, ?inverseJoinColumns = {@JoinColumn(columnDefinition="tid")}) ???private Set<Teacher> teachers; ???// ...省略get()set()}