我的环境：WAMP中的Hibernate 5,Java 8,Phpmyadmin

问题：Hibernate在表中创建自动增量ID,但是下一个序列被赋予另一个表.

预期

Table 1 Table 2

1. Hello 1. Foo

2. World 2. Bar

相反,它正在创造

Table 1 Table 2

1. Hello 2. Foo

3. World 4. Bar

项目结构

的hibernate.cfg.xml

/p>

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

com.mysql.jdbc.Driver

jdbc:mysql://localhost:3306/ansarihibernate

localuser

1

org.hibernate.dialect.MySQLDialect

org.hibernate.cache.internal.NoCacheProvider

true

create

MainM2M.java

package org.ansari.hibernate.manytomany;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

public class MainM2M {

public static void main(String[] args) {

StudentM2MCertificates st1 = new StudentM2MCertificates();

st1.setM2m_cert_det("Oracle Cert");

StudentM2MCertificates st2 = new StudentM2MCertificates();

st2.setM2m_cert_det("Big Data Cert");

StudentM2M s1 = new StudentM2M();

s1.setM2m_stu_name("Ansari");

s1.getSetM2MCert().add(st1);

StudentM2M s2 = new StudentM2M();

s2.setM2m_stu_name("Mohammed");

s2.getSetM2MCert().add(st2);

SessionFactory sessFac = new Configuration().configure().buildSessionFactory();

Session session = sessFac.openSession();

session.beginTransaction();

session.save(s1);

session.save(s2);

session.getTransaction().commit();

session.close();

sessFac.close();

}

}

StudentM2M.java

package org.ansari.hibernate.manytomany;

import java.util.HashSet;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.ManyToMany;

import javax.persistence.Table;

@Entity

@Table(name="STUDENTM2M")

public class StudentM2M {

@Id

@GeneratedValue

private int m2m_id;

private String m2m_stu_name;

@ManyToMany(cascade=CascadeType.ALL)

private Set setM2MCert = new HashSet(0);

public Set getSetM2MCert() {

return setM2MCert;

}

public void setSetM2MCert(Set setM2MCert) {

this.setM2MCert = setM2MCert;

}

public int getM2m_id() {

return m2m_id;

}

public void setM2m_id(int m2m_id) {

this.m2m_id = m2m_id;

}

public String getM2m_stu_name() {

return m2m_stu_name;

}

public void setM2m_stu_name(String m2m_stu_name) {

this.m2m_stu_name = m2m_stu_name;

}

}

StudentM2MCertificates

package org.ansari.hibernate.manytomany;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.Table;

@Entity

@Table(name="CERTM2M")

public class StudentM2MCertificates {

@Id

@GeneratedValue

private int m2m_cert_id;

private String m2m_cert_det;

public int getM2m_cert_id() {

return m2m_cert_id;

}

public void setM2m_cert_id(int m2m_cert_id) {

this.m2m_cert_id = m2m_cert_id;

}

public String getM2m_cert_det() {

return m2m_cert_det;

}

public void setM2m_cert_det(String m2m_cert_det) {

this.m2m_cert_det = m2m_cert_det;

}

}

表结构

certm2m

hibernate_sequence

studentm2m

studentm2m_certm2m