单向N-N关联必须使用连接表。
Company实体:
package com.ydoing.hibernate5;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
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.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
@Entity
@Table(name = "company_inf")
public class Company {
@Id
@Column(name = "company_id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
@ManyToMany(targetEntity = Product.class, cascade = CascadeType.ALL)
@JoinTable(name = "company_product", joinColumns = @JoinColumn(name = "company_id", referencedColumnName = "company_id"), inverseJoinColumns = @JoinColumn(name = "product_id", referencedColumnName = "product_id"))
private Set<Product> products = new HashSet<>();
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Set<Product> getProducts() {
return products;
}
public void setProducts(Set<Product> products) {
this.products = products;
}
}
Product实体:
package com.ydoing.hibernate5;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "product_inf")
public class Product {
@Id
@Column(name = "product_id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Console输出:
Hibernate:
insert
into
company_inf
(name)
values
(?)
Hibernate:
select
last_insert_id()
Hibernate:
insert
into
product_inf
(name)
values
(?)
Hibernate:
select
last_insert_id()
Hibernate:
insert
into
product_inf
(name)
values
(?)
Hibernate:
select
last_insert_id()
Hibernate:
insert
into
company_product
(company_id, product_id)
values
(?, ?)
Hibernate:
insert
into
company_product
(company_id, product_id)
values
(?, ?)
从输出不难看出,Hibernate创建了连接表company_product。
数据库表:
<script type="text/javascript">
$(function () {
$('pre.prettyprint code').each(function () {
var lines = $(this).text().split('\n').length;
var $numbering = $('<ul/>').addClass('pre-numbering').hide();
$(this).addClass('has-numbering').parent().append($numbering);
for (i = 1; i <= lines; i++) {
$numbering.append($('<li/>').text(i));
};
$numbering.fadeIn(1700);
});
});
</script>
版权声明:本文为博主原创文章,未经博主允许不得转载。
分享到:
相关推荐
hibernate-commons-annotations-4.0.1.Final.jar hibernate-core-4.1.12.Final.jar hibernate-ehcache-4.1.12.Final.jar hibernate-entitymanager-4.1.12.Final.jar hibernate-jpa-2.0-api-1.0.1.Final.jar ...
赠送jar包:hibernate-jpa-2.1-api-1.0.2.Final.jar; 赠送原API文档:hibernate-jpa-2.1-api-1.0.2.Final-javadoc.jar; 赠送源代码:hibernate-jpa-2.1-api-1.0.2.Final-sources.jar; 赠送Maven依赖信息文件:...
Hibernate-单向关系Hibernate-单向关系
赠送jar包:hibernate-jpa-2.1-api-1.0.2.Final.jar; 赠送原API文档:hibernate-jpa-2.1-api-1.0.2.Final-javadoc.jar; 赠送源代码:hibernate-jpa-2.1-api-1.0.2.Final-sources.jar; 赠送Maven依赖信息文件:...
hibernate one-to-one 一对一唯一外键关联映射_单向 and 双向
hibernatetools-Update-4.1.1.zip
Eclipse中Hibernate插件。
hibernate-jpa-2.1-api-1.0.0.final-sources.jar 源码 hibernate-jpa-2.1-api-1.0.0.final-sources.jar 源码
Eclipse用于Hibernate框架开发插件,全CSDN最低资源分下载,让你吃上真正的石灰。。。
Hibernate单向关联代码示例,将解压后的目录设置成MyEclipse工作空间即可,无需导入
hibernate-commons-annotations-5.0.1.Final.jar的源码
hibernate-jpa-2.0-api-1.0.1.Final.jar
hibernate-jpa-2.1-api-1.0.0.final.jar.zip,内含hibernate-jpa-2.1-api-1.0.0.final.jar
NULL 博文链接:https://zhouhaitao.iteye.com/blog/1171227
Hibernate稳定版(hibernate-release-5.3.23.Final.zip),Hibernate ORM 是一个为应用程序、库和框架提供对象/关系映射 (ORM) 支持的库。它还提供了 JPA 规范的实现,这是 ORM 的标准 Java 规范。
hibernate many-to-many级联保存,级联更新,级联删除
hibernate-jpa-2.1-api-1.0.0.Final.jar官方下载,请放心使用
深入理解hibernate many-to-one(多对一)及 cascade(级联).
列如:hibernate-core-5.1.0.Final.jar hibernate-ehcache-5.1.0.Final.jar hibernate-entitymanager-5.1.0.Final.jar hibernate-envers-5.1.0.Final.jar hibernate-c3p0-5.1.0.Final.jar hibernate-jpa-2.1-api-...
hibernate-jpa-2.0-api-1.0.1.Final-sources.jar hibernate jpa 源代码