OneToMany:JPA
案例：客户与联系人
1.pom
4.0.0
org.example
day03
1.0-SNAPSHOT
5.0.2.RELEASE
5.0.7.Final
1.6.6
1.2.12
0.9.1.2
5.1.6
junit
junit
4.12
test
org.aspectj
aspectjweaver
1.6.8
org.springframework
spring-aop
${spring.version}
org.springframework
spring-context
${spring.version}
org.springframework
spring-context-support
${spring.version}
org.springframework
spring-orm
${spring.version}
org.springframework
spring-beans
${spring.version}
org.springframework
spring-core
${spring.version}
org.hibernate
hibernate-core
${hibernate.version}
org.hibernate
hibernate-entitymanager
${hibernate.version}
org.hibernate
hibernate-validator
5.2.1.Final
c3p0
c3p0
${c3p0.version}
log4j
log4j
${log4j.version}
org.slf4j
slf4j-api
${slf4j.version}
org.slf4j
slf4j-log4j12
${slf4j.version}
mysql
mysql-connector-java
${mysql.version}
org.springframework.data
spring-data-jpa
1.9.0.RELEASE
org.springframework
spring-test
${spring.version}
javax.el
javax.el-api
2.2.4
org.glassfish.web
javax.el
2.2.4
2.配置文件
update
3.domain
package cn.itcast.domain;
import javax.persistence.*;
import java.util.Set;
/**
* 1.实体类和表的映射关系
* @Eitity
* @Table
* 2.类中属性和表中字段的映射关系
* @Id
* @GeneratedValue
* @Column
*/
@Entity
@Table(name="cst_customer")
public class Customer {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="cust_id")
private Long custId;
@Column(name="cust_address")
private String custAddress;
@Column(name="cust_industry")
private String custIndustry;
@Column(name="cust_level")
private String custLevel;
@Column(name="cust_name")
private String custName;
@Column(name="cust_phone")
private String custPhone;
@Column(name="cust_source")
private String custSource;
//配置客户和联系人之间的关系（一对多关系）
/**
* 使用注解的形式配置多表关系
* 1.声明关系
* @OneToMany : 配置一对多关系
* targetEntity ：对方对象的字节码对象
* 2.配置外键（中间表）
* @JoinColumn : 配置外键
* name：外键字段名称
* referencedColumnName：参照的主表的主键字段名称
*
* * 在客户实体类上（一的一方）添加了外键了配置，所以对于客户而言，也具备了维护外键的作用
*
*/
// @OneToMany(targetEntity = LinkMan.class)
// @JoinColumn(name = "lkm_cust_id",referencedColumnName = "cust_id")
/**
* 放弃外键维护权
* mappedBy：对方配置关系的属性名称\
* cascade : 配置级联（可以配置到设置多表的映射关系的注解上）
* CascadeType.all : 所有
* MERGE ：更新
* PERSIST ：保存
* REMOVE ：删除
*
* fetch : 配置关联对象的加载方式
* EAGER ：立即加载
* LAZY ：延迟加载
*/
@OneToMany(mappedBy = "customer",cascade = CascadeType.ALL)
private Set linkMans ;
public Long getCustId() {
return custId;
}
public void setCustId(Long custId) {
this.custId = custId;
}
public String getCustAddress() {
return custAddress;
}
public void setCustAddress(String custAddress) {
this.custAddress = custAddress;
}
public String getCustIndustry() {
return custIndustry;
}
public void setCustIndustry(String custIndustry) {
this.custIndustry = custIndustry;
}
public String getCustLevel() {
return custLevel;
}
public void setCustLevel(String custLevel) {
this.custLevel = custLevel;
}
public String getCustName() {
return custName;
}
public void setCustName(String custName) {
this.custName = custName;
}
public String getCustPhone() {
return custPhone;
}
public void setCustPhone(String custPhone) {
this.custPhone = custPhone;
}
public String getCustSource() {
return custSource;
}
public void setCustSource(String custSource) {
this.custSource = custSource;
}
public Set getLinkMans() {
return linkMans;
}
public void setLinkMans(Set linkMans) {
this.linkMans = linkMans;
}
@Override
public String toString() {
return "Customer{" +
"custId=" + custId +
", custAddress='" + custAddress + '\'' +
", custIndustry='" + custIndustry + '\'' +
", custLevel='" + custLevel + '\'' +
", custName='" + custName + '\'' +
", custPhone='" + custPhone + '\'' +
", custSource='" + custSource + '\'' +
'}';
}
}
package cn.itcast.domain;
import javax.persistence.*;
@Entity
@Table(name = "cst_linkman")
public class LinkMan {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "lkm_id")
private Long lkmId; //联系人编号(主键)
@Column(name = "lkm_name")
private String lkmName;//联系人姓名
@Column(name = "lkm_gender")
private String lkmGender;//联系人性别
@Column(name = "lkm_phone")
private String lkmPhone;//联系人办公电话
@Column(name = "lkm_mobile")
private String lkmMobile;//联系人手机
@Column(name = "lkm_email")
private String lkmEmail;//联系人邮箱
@Column(name = "lkm_position")
private String lkmPosition;//联系人职位
@Column(name = "lkm_memo")
private String lkmMemo;//联系人备注
/**
* 配置联系人到客户的多对一关系
* 使用注解的形式配置多对一关系
* 1.配置表关系
* @ManyToOne : 配置多对一关系
* targetEntity：对方的实体类字节码
* 2.配置外键（中间表）
*
* * 配置外键的过程，配置到了多的一方，就会在多的一方维护外键
*
*/
@ManyToOne(targetEntity = Customer.class,fetch = FetchType.LAZY)
@JoinColumn(name = "lkm_cust_id",referencedColumnName = "cust_id")
private Customer customer;
public Long getLkmId() {
return lkmId;
}
public void setLkmId(Long lkmId) {
this.lkmId = lkmId;
}
public String getLkmName() {
return lkmName;
}
public void setLkmName(String lkmName) {
this.lkmName = lkmName;
}
public String getLkmGender() {
return lkmGender;
}
public void setLkmGender(String lkmGender) {
this.lkmGender = lkmGender;
}
public String getLkmPhone() {
return lkmPhone;
}
public void setLkmPhone(String lkmPhone) {
this.lkmPhone = lkmPhone;
}
public String getLkmMobile() {
return lkmMobile;
}
public void setLkmMobile(String lkmMobile) {
this.lkmMobile = lkmMobile;
}
public String getLkmEmail() {
return lkmEmail;
}
public void setLkmEmail(String lkmEmail) {
this.lkmEmail = lkmEmail;
}
public String getLkmPosition() {
return lkmPosition;
}
public void setLkmPosition(String lkmPosition) {
this.lkmPosition = lkmPosition;
}
public String getLkmMemo() {
return lkmMemo;
}
public void setLkmMemo(String lkmMemo) {
this.lkmMemo = lkmMemo;
}
public Customer getCustomer() {
return customer;
}
public void setCustomer(Customer customer) {
this.customer = customer;
}
@Override
public String toString() {
return "LinkMan{" +
"lkmId=" + lkmId +
", lkmName='" + lkmName + '\'' +
", lkmGender='" + lkmGender + '\'' +
", lkmPhone='" + lkmPhone + '\'' +
", lkmMobile='" + lkmMobile + '\'' +
", lkmEmail='" + lkmEmail + '\'' +
", lkmPosition='" + lkmPosition + '\'' +
", lkmMemo='" + lkmMemo + '\'' +
'}';
}
}
4.dao
5.测试（外键与级联）
@ContextConfiguration(locations = "classpath:applicationContext.xml")
@RunWith(SpringJUnit4ClassRunner.class)
public class JPAdemo {
@Autowired
private CustomerDao customerDao;
@Autowired
private LinkManDao linkManDao;
@Test
@Transactional //配置事务
@Rollback(false) //不自动回滚
public void testAdd() {
//创建一个客户，创建一个联系人
Customer customer = new Customer();
customer.setCustName("百度");
LinkMan linkMan = new LinkMan();
linkMan.setLkmName("小李");
/**
* 配置了客户到联系人的关系
* 从客户的角度上：发送两条insert语句，发送一条更新语句更新数据库（更新外键）
* 由于我们配置了客户到联系人的关系：客户可以对外键进行维护
*/
linkMan.setCustomer(customer);
customerDao.save(customer);
linkManDao.save(linkMan);
}
@Test
@Transactional //配置事务
@Rollback(false) //不自动回滚
public void testDel() {
//删除（先找到）
Customer customer = customerDao.findOne(94l);
customerDao.delete(customer);
}
}