一、表關係分析
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二、一對多/多對一表關係的插入和刪除
Customer(客戶類)---LinkMan(聯繫人):一對多(一個客戶會有多個聯繫方式)
1.這裏我們確認了是一對多表關係,然後我們分析實體類中
的屬性,寫實體類:Customer(客戶類)
public class Customer {
private long cust_id;
private String cust_name;
private String cust_source;
private String cust_industry;
private String cust_level;
private String cust_linkman;
private String cust_phone;
private String cust_mobile;
private Set<LinkMan> linkMans = new HashSet<>();
LinkMan實體類:
public class LinkMan {
/*
* CREATE TABLE `cst_linkman` (
`lkm_id` bigint(32) NOT NULL AUTO_INCREMENT COMMENT '聯繫人編號(主鍵)',
`lkm_name` varchar(16) DEFAULT NULL COMMENT '聯繫人姓名',
`lkm_cust_id` bigint(32) NOT NULL COMMENT '客戶id',
`lkm_gender` char(1) DEFAULT NULL COMMENT '聯繫人性別',
`lkm_phone` varchar(16) DEFAULT NULL COMMENT '聯繫人辦公電話',
`lkm_mobile` varchar(16) DEFAULT NULL COMMENT '聯繫人手機',
`lkm_email` varchar(64) DEFAULT NULL COMMENT '聯繫人郵箱',
`lkm_qq` varchar(16) DEFAULT NULL COMMENT '聯繫人qq',
`lkm_position` varchar(16) DEFAULT NULL COMMENT '聯繫人職位',
`lkm_memo` varchar(512) DEFAULT NULL COMMENT '聯繫人備註',
PRIMARY KEY (`lkm_id`),
KEY `FK_cst_linkman_lkm_cust_id` (`lkm_cust_id`),
CONSTRAINT `FK_cst_linkman_lkm_cust_id` FOREIGN KEY (`lkm_cust_id`) REFERENCES `cst_customer` (`cust_id`) ON DELETE NO ACTION ON UPDATE NO ACTION
)
*/
private long lkm_id
private String lkm_name
private long lkm_cust_id
private char lkm_gender
private String lkm_phone
private String lkm_mobile
private String lkm_email
private String lkm_qq
private String lkm_position
private String lkm_memo
//多表,表示跟一表的關係
private Customer customer
//get/set/有參無參/toString()省略
實體類寫出來後,我們將配置各個實體類的映射文件
1.Customer映射文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.lanou3g.bean">
<class name="Customer" table="cst_customer">
<id name="cust_id" column="cust_id">
<generator class="native"></generator>
</id>
<property name="cust_name" column="cust_name"></property>
<property name="cust_source" column="cust_source"></property>
<property name="cust_industry" column="cust_industry"></property>
<property name="cust_level" column="cust_level"></property>
<property name="cust_linkman" column="cust_linkman"></property>
<property name="cust_phone" column="cust_phone"></property>
<property name="cust_mobile" column="cust_mobile"></property>
<set name="linkMans" inverse="true" cascade="delete">
<key column="lkm_cust_id"></key>
<one-to-many class="LinkMan"/>
</set>
</class>
</hibernate-mapping>
2.LinkMan配置文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.lanou3g.bean">
<class name="LinkMan" table="cst_linkman">
<id name="lkm_id" column="lkm_id">
<generator class="native"></generator>
</id>
<property name="lkm_name" column="lkm_name"></property>
<property name="lkm_gender" column="lkm_gender"></property>
<property name="lkm_phone" column="lkm_phone"></property>
<property name="lkm_mobile" column="lkm_mobile"></property>
<property name="lkm_email" column="lkm_email"></property>
<property name="lkm_qq" column="lkm_qq"></property>
<property name="lkm_position" column="lkm_position"></property>
<property name="lkm_memo" column="lkm_memo"></property>
<many-to-one name="customer" column="lkm_cust_id" class="Customer"></many-to-one>
</class>
</hibernate-mapping>
3.添加和刪除
public class Demo01 {
@Test
public void fun1() {
Session session = HibernateUtils.getSession();
Transaction transaction = session.beginTransaction();
Customer customer = new Customer();
customer.setCust_name("藍鷗科技");
customer.setCust_phone("123");
LinkMan l1 = new LinkMan();
l1.setLkm_name("yangyuanhu");
LinkMan l2 = new LinkMan();
l2.setLkm_name("liuchangkai");
customer.getLinkMans().add(l1);
customer.getLinkMans().add(l2);
l1.setCustomer(customer);
l2.setCustomer(customer);
session.save(customer);
session.save(l1);
session.save(l2);
transaction.commit();
session.close();
}
@Test
public void fun2() {
Session session = HibernateUtils.getSession();
Transaction transaction = session.beginTransaction();
Customer customer = session.get(Customer.class, 1l);
LinkMan linkMan = session.get(LinkMan.class, 2l);
customer.getLinkMans().remove(linkMan);
linkMan.setCustomer(null);
transaction.commit();
session.close();
}
@Test
public void fun3() {
Session session = HibernateUtils.getSession();
Transaction transaction = session.beginTransaction();
Customer customer = session.get(Customer.class, 1l);
LinkMan l3 = new LinkMan();
l3.setLkm_name("添加");
customer.getLinkMans().add(l3);
l3.setCustomer(customer);
session.save(customer);
session.save(l3);
transaction.commit();
session.close();
}
@Test
public void fun4() {
Session session = HibernateUtils.getSession();
Transaction transaction = session.beginTransaction();
Customer customer = new Customer();
customer.setCust_name("芬歐科技");
LinkMan l1 = new LinkMan();
l1.setLkm_name("李勝雲");
customer.getLinkMans().add(l1);
l1.setCustomer(customer);
session.save(customer);
transaction.commit();
session.close();
}
@Test
public void fun5() {
Session session = HibernateUtils.getSession();
Transaction transaction = session.beginTransaction();
Customer customer = session.get(Customer.class, 1l);
session.delete(customer);
transaction.commit();
session.close();
}
}
三、多對多表(User用戶實體類和Role角色實體類)
User實體類
public class User {
private Long user_id;
private String user_code;
private String user_name;
private String user_password;
private Character user_state;
private Set<Role> role = new HashSet<>();
Role實體類:
public class Role {
/*
CREATE TABLE `sys_role` (
`role_id` bigint(32) NOT NULL AUTO_INCREMENT,
`role_name` varchar(32) NOT NULL COMMENT
`role_memo` varchar(128) DEFAULT NULL COMMENT
PRIMARY KEY (`role_id`)
) ;
*/
private Long role_id;
private String role_name;
private String role_memo;
private Set<User> users = new HashSet<>();
配置文件
1.User
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.lanou3g.bean">
<class name="User" table="sys_user">
<id name="user_id" column="user_id">
<generator class="native"></generator>
</id>
<property name="user_code" column="user_code"></property>
<property name="user_name" column="user_name"></property>
<property name="user_password" column="user_password"></property>
<property name="user_state" column="user_state"></property>
<set name="role" table="sys_user_role" inverse="true">
<key column="user_id"></key>
<many-to-many class="Role" column="role_id"></many-to-many>
</set>
</class>
</hibernate-mapping>
Role映射文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.lanou3g.bean">
<class name="Role" table="sys_role">
<id name="role_id" column="role_id">
<generator class="native"></generator>
</id>
<property name="role_name" column="role_name"></property>
<property name="role_memo" column="role_memo"></property>
<set name="users" table="sys_user_role" cascade="delete">
<key column="role_id"></key>
<many-to-many class="User" column="user_id"></many-to-many>
</set>
</class>
</hibernate-mapping>
多對多表的添加和刪除
public class Demo02 {
@Test
public void fun1() {
Session session = HibernateUtils.getSession()
Transaction transaction = session.beginTransaction()
//---------
User user1 = new User()
user1.setUser_name("楊元虎")
User user2 = new User()
user2.setUser_name("劉長凱")
Role role1 = new Role()
role1.setRole_name("保姆")
Role role2 = new Role()
role1.setRole_name("保安")
//設置關係
user1.getRole().add(role1)
user1.getRole().add(role2)
user2.getRole().add(role1)
user2.getRole().add(role2)
role1.getUsers().add(user1)
role1.getUsers().add(user2)
role2.getUsers().add(user1)
role2.getUsers().add(user2)
session.save(user1)
session.save(user2)
session.save(role1)
session.save(role2)
//-----------
transaction.commit()
session.close()
}
//爲員工id爲1的員工增加一個角色(保潔)
@Test
public void fun2() {
Session session = HibernateUtils.getSession()
Transaction transaction = session.beginTransaction()
//---------
User user = session.get(User.class, 1l)
//注意:雙側關係都要添加上
Role role = new Role()
role.setRole_name("保潔")
user.getRole().add(role)
role.getUsers().add(user)
// session.save(user)
session.save(role)
//-----------
transaction.commit()
session.close()
}
//爲id爲1的員工解除一個角色(角色id爲2)
@Test
public void fun3() {
Session session = HibernateUtils.getSession()
Transaction transaction = session.beginTransaction()
//---------
User user = session.get(User.class, 1l)
Role role = session.get(Role.class, 2l)
user.getRole().remove(role)
role.getUsers().remove(user)
session.save(role)
session.save(user)
//-----------
transaction.commit()
session.close()
}
}