spring data jpa配置一对多，多对多关系映射

//配置一对多关系映射
    /**
     *     @OneToMany(targetEntity = LinkMan.class)
     *          targetEntity配置对方的字节码文件
     *     @JoinColumn(name = "lkm_cust_id",referencedColumnName = "cust_id")
     *          name配置外键名称，referencedColumnName配置外键引用主表的主键
     */
    @OneToMany(targetEntity = LinkMan.class)
    @JoinColumn(name = "lkm_cust_id",referencedColumnName = "cust_id")
    private Set<LinkMan> linkMans=new HashSet<LinkMan>();

//配置多对一关系映射
    @ManyToOne(targetEntity = Customer.class)
    @JoinColumn(name = "lkm_cust_id",referencedColumnName = "cust_id")
    private Customer customer;

编写测试类

import com.smx.dao.CustomerDao;
import com.smx.dao.LinkManDao;
import com.smx.domain.Customer;
import com.smx.domain.LinkMan;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.annotation.Rollback;
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 OneToManyTest {
    @Autowired
    private CustomerDao customerDao;
    @Autowired
    private LinkManDao linkManDao;
    @Test
    @Transactional
    @Rollback(value = false)
    //测试保存操作
    public void addTest(){
        Customer customer=new Customer();
        customer.setCustName("百度");
        LinkMan linkMan=new LinkMan();
        linkMan.setLmkName("张三");

        customer.getLinkMans().add(linkMan);
        linkManDao.save(linkMan);
        customerDao.save(customer);


    }
}

级联操作

 @OneToMany(mappedBy = "customer",cascade = {CascadeType.MERGE})

MERGE：更新
PERSIST:保存
REMOVE:删除