Question

我在db中有两个带有ff列的模型：

ContractHeader
id = primary key
con_num

ContractEntitlement
id = primary key
ch_id = foreign key to id in ContractHeader table
category

一个合约标题可以有多个合约权利。模型类是：

ContractHeader.java

@Entity
@Table(name = "CONTRACT_HEADER")
public class ContractHeader {

    @Id
    @Column(name = "id", unique = true, nullable = false)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @OneToMany(fetch = FetchType.LAZY, mappedBy = "contractHeader")
    private List<ContractEntitlement> contractEntitlements;

    @Column(name = "con_num")
    private String conNum;
    getter and setter ....

ContractEntitlement

@Entity
@Table(name = "CONTRACT_ENTITLEMENT")
public class ContractEntitlement {

    @Id
    @Column(name = "id", unique = true, nullable = false)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "ch_id", referencedColumnName = "id")
    private ContractHeader contractHeader; 

    @Column(name = "category")
    private String category;

   getter and setter ....

当我从jsp保存日期时，它正确地在spring中插入每个表没有错误的值，但是ch_id字段（foreign_key）总是为空。知道为什么ch_is没有被来自contractheader表的id填充？

Answer 1

这不是问题的答案，而是更多的解决方法，并希望分享。而不是在db方面处理我在保存后会话关闭之前得到id：

public String addContractHeader(@Validated @ModelAttribute("contractHeader") ContractHeader p, BindingResult bindingResult, Model model) {

    System.out.println("BEFORE " + p.getId());
    this.contractHeaderService.addContractHeader(p);
    System.out.println("AFTER " + p.getId());
    for (Iterator<ContractEntitlement> i = p.getContractEntitlements().iterator(); i.hasNext();) {
        ContractEntitlement employee = i.next();
        -- use p.getId() to store in ch_id (foreign_key)
        this.contractEntitlementService.addContractEntitlement(employee);

    }

BEFORE 0
Hibernate: insert into CONTRACT_HEADER (contact_email, contact_number, contact_person, contract_number, contract_package, contract_status, contract_sum, contract_type, currency_type, customer_address, customer_name, expiry_date, package_other, remarks, start_date) values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
Info: INFO : com.at.ccts.dao.ContractHeaderDAOImpl - ContractHeader saved successfully, ContractHeader Details=com.at.ccts.model.ContractHeader@39d1a603
2017-05-01T20:01:52.537+0800|Info:
AFTER 19

我将id存储在db（序列化）中。

表中的Spring mvc外部字段不会更新

1 个答案: