springdata_ multi-table relationships in one small case __

First, create a maven project, the introduction of dependency, set up a profile

Dependent and set the configuration file can reference previous blog "springdata__jpa"

Second, create entity classes

1.customer class

cn.dzl.jpa.entity Package; 

Import the javax.persistence *;. 

@Entity 
the @Table (name = "cust_customer") 
public class the Customer { 
    // increment primary key set policy 
    @GeneratedValue (Strategy = GenerationType.IDENTITY) 
    @Id 
    Private custId Long; 
    Private String custName; 
    Private String custSource; 
    Private String custIndustry; 
    Private String custLevel; 
    Private String custAddress; 
    Private String custPhone; 

    @ // PrimaryKeyJoinColumn primary key associated 
    @OneToOne (cascade = CascadeType.ALL) // set associated cascade effect is, two associated tables, may be separately changed one table 
    private CustomerExt ext; // this field indicates which table object associated 

    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 class

cn.dzl.jpa.entity Package; 

Import the javax.persistence *;. 

@Entity 
the @Table (name = "customer_ext") 
public class CustomerExt { 
    @ // Id on which the comment field, which is the primary key field 
    @GeneratedValue ( strategy = GenerationType.IDENTITY) // primary key is set to the self-energizing state 
    Private Long extId; 
    Private String Memo; 
    Private String info; 
    @ // PrimaryKeyJoinColumn annotation indicates that the primary key is the correlation between two 
    @ OneToOne // between two tables one to one relationship between 
    private Customer customer; // this field indicate which table object associated 

    public the getCustomer the Customer () { 
        return Customer; 
    } 

    public void setCustomer (Customer the 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 + '\'' +
                '}'; 
    } 
} 

Third, create dao interface (must carry JpaRepository <entity type, primary key type>) 

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 
    // change the database, things need to use 
    the @Transactional 
    // submit 
    @Commit 
    public void addCustomer () { 
        // create customer objects 
        the Customer customer = new new the Customer (); 
        customer.setCustName ( " Ding boss "); 
        customer.setCustAddress (" Beijing "); 
        // create customerExt objects 
        customerExt customerExt = new new customerExt (); 
        customerExt.setInfo (" good mood today "); 
        customerExt.setMemo (" play out "); 
        // Targets association 
        customer.setExt (customerExt); 
        customerExt.setCustomer (Customer);
        // call the dao layer method saved to the database
        customerDao.save(customer);
//        customerExtDao.save(customerExt);
    }
}