一、创建maven工程,引入依赖,设置配置文件
依赖和配置文件的设置可以参考,之前的博客《springdata__jpa》
二、创建实体类
1.customer类
package cn.dzl.jpa.entity;
import javax.persistence.*;
@Entity
@Table(name = "cust_customer")
public class Customer {
//设置主键自增策略
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Id
private long custId;
private String custName;
private String custSource;
private String custIndustry;
private String custLevel;
private String custAddress;
private String custPhone;
@PrimaryKeyJoinColumn//主键关联
@OneToOne(cascade = CascadeType.ALL)//设置联级关联,效果是,两个有关联的表,可以单独地改变其中一个表
private CustomerExt ext; //该字段表明关联的是哪个表对象
public CustomerExt getExt() {
return ext;
}
public void setExt(CustomerExt ext) {
this.ext = ext;
}
public long getCustId() {
return custId;
}
public void setCustId(long custId) {
this.custId = custId;
}
public String getCustName() {
return custName;
}
public void setCustName(String custName) {
this.custName = custName;
}
public String getCustSource() {
return custSource;
}
public void setCustSource(String custSource) {
this.custSource = custSource;
}
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 getCustAddress() {
return custAddress;
}
public void setCustAddress(String custAddress) {
this.custAddress = custAddress;
}
public String getCustPhone() {
return custPhone;
}
public void setCustPhone(String custPhone) {
this.custPhone = custPhone;
}
@Override
public String toString() {
return "Customer{" +
"custId=" + custId +
", custName='" + custName + '\'' +
", custSource='" + custSource + '\'' +
", custIndustry='" + custIndustry + '\'' +
", custLevel='" + custLevel + '\'' +
", custAddress='" + custAddress + '\'' +
", custPhone='" + custPhone + '\'' +
'}';
}
}
2.CustomerExt类
package cn.dzl.jpa.entity;
import javax.persistence.*;
@Entity
@Table(name = "customer_ext")
public class CustomerExt {
@Id//该注解在哪一个字段上,哪个字段就是主键
@GeneratedValue(strategy = GenerationType.IDENTITY)//设置主键为自增状态
private long extId;
private String memo;
private String info;
@PrimaryKeyJoinColumn//该注解表明两个表之间是主键关联
@OneToOne//两个表之间的关系是一对一
private Customer customer;//该字段表明,关联的是哪个表对象
public Customer getCustomer() {
return customer;
}
public void setCustomer(Customer customer) {
this.customer = customer;
}
public long getExtId() {
return extId;
}
public void setExtId(long extId) {
this.extId = extId;
}
public String getMemo() {
return memo;
}
public void setMemo(String memo) {
this.memo = memo;
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
@Override
public String toString() {
return "CustomerExt{" +
"extId=" + extId +
", memo='" + memo + '\'' +
", info='" + info + '\'' +
'}';
}
}
三、创建dao接口(一定要继承JpaRepository<实体类型,主键类型>)
1.CustomerDao
package cn.dzl.jpa.dao;
import cn.dzl.jpa.entity.Customer;
import org.springframework.data.jpa.repository.JpaRepository;
public interface CustomerDao extends JpaRepository<Customer,Long> {
}
2.CustomerExtDao
package cn.dzl.jpa.dao;
import cn.dzl.jpa.entity.CustomerExt;
import org.springframework.data.jpa.repository.JpaRepository;
public interface CustomerExtDao extends JpaRepository<CustomerExt,Long> {
}
四、测试类OneToOne
package cn.dzl;
import cn.dzl.jpa.dao.CustomerDao;
import cn.dzl.jpa.dao.CustomerExtDao;
import cn.dzl.jpa.entity.Customer;
import cn.dzl.jpa.entity.CustomerExt;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.annotation.Commit;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.annotation.Transactional;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class OneToOne {
@Autowired
CustomerDao customerDao;
@Autowired
CustomerExtDao customerExtDao;
@Test
//更改数据库,需要用到事物
@Transactional
//提交
@Commit
public void addCustomer(){
//创建customer对象
Customer customer = new Customer();
customer.setCustName("丁老大");
customer.setCustAddress("北京");
//创建customerExt对象
CustomerExt customerExt = new CustomerExt();
customerExt.setInfo("今天心情不错");
customerExt.setMemo("打球去");
//设置对象关联关系
customer.setExt(customerExt);
customerExt.setCustomer(customer);
//调用dao层方法保存到数据库中
customerDao.save(customer);
// customerExtDao.save(customerExt);
}
}