java - Hibernate 仅从数据库中检索第一条记录，其余为空

标签 java mysql spring hibernate

我有一个 uni 项目，旨在记录销售额，并根据一组预先制定的规则，确定其中哪些有资格获得四种附加条件:两种奖金(特定产品和销售人员的销售额)和两种奖品(产品 Activity 和最佳推销员)。 它使用 Java (Spring Framework) 编写，并使用 Hibernate 与 MySql 数据库和表示层的 JSP 进行通信。 在测试它时，我发现销售奖金的某些部分无法正常工作。即使计算成功执行并且结果存储在数据库中，但在尝试检索它们时我得到一个空值。

例如，当执行计算时，jsp中显示的结果是

From      |    To     |  Salesman   |      Bonus       |             Prizes
                                    | Sales | Product  | Best salesman | Campaign
---------------------------------------------------------------------------------
01/01/2013  22/11/2013   Salesman 1    No      No          No          No
01/01/2013  22/11/2013   Salesman 2    Yes     Yes         No          Yes
01/01/2013  22/11/2013   Salesman 3    Yes     Yes         No          No
01/01/2013  22/11/2013   Salesman 4    No      No          No          No

但是刷新之后，涉及到从数据库中获取结果，只显示

From      |    To     |  Salesman   |      Bonus       |             Prizes
                                    | Sales | Product  | Best salesman | Campaign
---------------------------------------------------------------------------------
01/01/2013  22/11/2013  Salesman 2    Yes      Yes          No        Yes
01/01/2013  22/11/2013  Salesman 3    No       Yes          No         No

如果我通过 PHPMyAdmin 检查 SalesBonus 表，我会得到

id   dateCreation    dateFrom     dateTo    total  units salesman_id
---------------------------------------------------------------------
1     2014-02-05    2013-01-01  2013-11-22   200     1      2
4     2014-02-05    2013-01-01  2013-11-22   200     3      3

此外，如果我使用 Debug 运行，变量树会显示

AllBonuses ArrayList<E> (id=491)
    elementData Object[3] (id=502)
        [0] Aditional (id=503)
            productCampaignRegistry Prize (id=506)
            ProductBonus PersistentBag (id=507)
            salesBonusRegistry SalesBonus (id=508)
            dateCreation Timestamp (id=509)
            dateFrom Timestamp (id=510)
            dateTo Timestamp (id=511)
            id 1
            bestSalesman null
            salesman Salesman (id=512)
                active true
                lastname "Noble" (id=513)
                id 2 
                name "Donna" (id=514)
        [1] Aditional (id=504)
            productCampaignRegistry null
            ProductBonus PersistentBag (id=515)
            SalesBonusRegistry null (should be id 4 in the SalesBonus table)
            dateCreation Timestamp (id=516)
            dateFrom Timestamp (id=517)
            dateTo Timestamp (id=518)
            id 2
            bestSalesman null
            salesman Salesman (id=519)
                active true
                lastname "Dent" (id=520)
                id 3
                name "Arthur" (id=521)

这意味着 bonuses 表中显示的 SalesBonus 注册表已被存储，但不知何故在检索它所属的 Aditional 注册表时它没有出现。

为了确保这是一个问题，我删除了整个数据库，重新创建了它，插入了一个新的 Salesman 和 Sales 并执行了计算，以便它应该插入一个新的 SalesBonus 注册表。不幸的是，这个问题反复出现。

类是这些

@Entity
public class Aditional implements Serializable {
@Transient
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@Column(nullable=false)
private Date dateCreation;
@Column(nullable=false)
private Date dateFrom;
@Column(nullable=false)
private Date dateTo;
@ManyToOne
private Salesman salesman;
@OneToOne
@JoinColumn(name="id")
private SalesBonus salesBonusRegistry;
@ManyToMany(cascade=CascadeType.ALL, fetch= FetchType.EAGER)
@Fetch(value = FetchMode.SUBSELECT)
private List<ProductBonus> productBonuses;
@OneToOne
@JoinColumn(name="id")
private Prize bestSalesman;
@OneToOne
@JoinColumn(name="id")
private Prize productCampaign;

@Entity
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
@DiscriminatorColumn(name="type", discriminatorType=DiscriminatorType.STRING)
public class Bonus implements Serializable {
@Transient
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
private int id;
@Column(nullable=false)
private Date dateCreation;
@Column(nullable=false)
private Date dateFrom;
@Column(nullable=false)
private Date dateTo;
@ManyToOne(cascade=CascadeType.ALL, fetch= FetchType.EAGER)
private Salesman salesman;
@Column(nullable=false)
private int units=0;
@Column(nullable=false)
private float total=0;

@Entity
@DiscriminatorValue(value="S")
public class SalesBonus extends Bonus{
@Transient
private static final long serialVersionUID = 1L;
@ManyToMany(cascade=CascadeType.ALL, fetch= FetchType.EAGER)
@Fetch(value = FetchMode.SUBSELECT)
private List<Sale> elements;

有问题的servlet中使用的get方法是

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
setUser((User) request.getSession().getAttribute("user"));
if (getUser()==null)
{
response.sendRedirect(request.getContextPath() + "/login");
return;
}

if (!checkRole(getUser()))
{
response.sendRedirect(request.getContextPath() + "/error");
return;
}
request.setAttribute("salesmen", service.getActiveSalesmen());
request.setAttribute("products", service.getProducts());
request.setAttribute("aditionals", service.getAditionals());
request.getRequestDispatcher("/WEB-INF/ComputeAditionals.jsp").forward(request, response);
}

这是在服务层中用于检索附加注册表的方法

@Override
public ArrayList<Aditional> getAditionals() {
ArrayList<Aditional> all = dataAccess.getAditionals();

for (Aditional aditional : all)
{
if (aditional.getCampaign()!=null && aditional.getCampaign().getProduct()==null)
aditional.setCampaign(null);

if (aditional.getBestSalesman()!=null && aditional.getBestSalesman().getProduct()!=null)
aditional.setBestSalesman(null);
}
return all;
}

这是DataAcessHibernateTemplate中使用的方法

@Override
public ArrayList<Aditional> getAditionals()
{
return (ArrayList<Aditional>) this.hibernateTemplate.loadAll(Aditional.class);
}

并且在尝试检索 ProductBonus 注册表时，它也使用此

@Override
public ProductBonus getProductBonus(Integer id)
{
return this.hibernateTemplate.get(ProductBonus.class, id);
}

提前致谢!

编辑:这是我在加载 Adicional 注册表时得到的(略微编辑的)SLF4j 输出

18:34:33,853 DEBUG AbstractBatcher:410 - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
18:34:33,853 DEBUG ConnectionManager:444 - opening JDBC connection
18:34:33,881 DEBUG SQL:111 - 
select 
    this_.id as id5_6_, 
    this_.creationDate as creation2_5_6_, 
    this_.dateFrom as dateFrom5_6_, 
    this_.dateTo as dateTo5_6_, 
    this_.salesman_id as salesman5_5_6_,
    salesman2_.id as id3_0_,
    salesman2_.active as active3_0_,
    salesman2_.lastname as lastname3_0_,
    salesman2_.name as name3_0_,
    prize3_.id as id9_1_,
    prize3_.creationDate as creation2_9_1_,
    prize3_.dateFrom as dateFrom9_1_,
    prize3_.dateTo as dateTo9_1_,
    prize3_.total as total9_1_,
    prize3_.isCampaign as isCampaign9_1_,
    prize3_.prizeWinner_id as prizeWin7_9_1_,
    prize3_.product_id as product8_9_1_,
    salesman4_.id as id3_2_,
    salesman4_.active as active3_2_, 
    salesman4_.lastname as lastname3_2_,
    salesman4_.name as name3_2_, 
    product5_.id as id2_3_, 
    product5_.name as name2_3_, 
    product5_.costUnit as costUnit3_2_3_, 
    salesBonus6_.id as id6_4_, 
    salesBonus6_.creationDate as creation2_6_4_, 
    salesBonus6_.dateFrom as dateFrom6_4_, 
    salesBonus6_.dateTo as dateTo6_4_, 
    salesBonus6_.total as total6_4_, 
    salesBonus6_.units as units6_4_, 
    salesBonus6_.salesman_id as salesman7_6_4_, 
    salesman7_.id as id3_5_, 
    salesman7_.active as active3_5_, 
    salesman7_.lastname as lastname3_5_, 
    salesman7_.name as name3_5_ 
from 
  (Adicional this_ left outer join Salesman salesman2_ on 
    (this_.salesman_id=salesman2_.id left outer join Prize prize3_ on 
      (this_.id=prize3_.id left outer join Salesman salesman4_ on 
    (prize3_.prizeWinner_id=salesman4_.id left outer join Product product5_ on
      (prize3_.product_id=product5_.id left outer join SalesBonus salesBonus6_  on 
        (this_.id=salesBonus6_.id left outer join Salesman salesman7_ on salesBonus6_.salesman_id=salesman7_.id))))))

18:34:33,881 TRACE AbstractBatcher:513 - preparing statement
18:34:33,886 DEBUG AbstractBatcher:426 - about to open ResultSet (open ResultSets: 0, globally: 0)
18:34:33,890 TRACE BasicExtractor:71 - found [2] as column [id3_0_]
18:34:33,891 TRACE BasicExtractor:66 - found [null] as column [id9_1_]
18:34:33,891 TRACE BasicExtractor:66 - found [null] as column [id3_2_]
18:34:33,891 TRACE BasicExtractor:66 - found [null] as column [id2_3_]
18:34:33,892 TRACE BasicExtractor:71 - found [1] as column [id6_4_]
18:34:33,892 TRACE BasicExtractor:71 - found [2] as column [id3_5_]
18:34:33,893 TRACE BasicExtractor:71 - found [1] as column [id5_6_]
18:34:33,895 TRACE BasicExtractor:71 - found [true] as column [active3_0_]
18:34:33,896 TRACE BasicExtractor:71 - found [Noble] as column [lastname3_0_]
18:34:33,896 TRACE BasicExtractor:71 - found [Donna] as column [name3_0_]
18:34:33,907 TRACE BasicExtractor:71 - found [2013-12-20 20:17:34.0] as column [creation2_6_4_]
18:34:33,908 TRACE BasicExtractor:71 - found [2013-01-01 00:00:00.0] as column [dateFrom6_4_]
18:34:33,908 TRACE BasicExtractor:71 - found [2013-11-22 00:00:00.0] as column [dateTo6_4_]
18:34:33,909 TRACE BasicExtractor:71 - found [200.0] as column [total6_4_]
18:34:33,909 TRACE BasicExtractor:71 - found [1] as column [units6_4_]
18:34:33,909 TRACE BasicExtractor:71 - found [2] as column [salesman7_6_4_]
18:34:33,910 TRACE BasicExtractor:71 - found [2013-12-20 20:17:34.0] as column [creation2_5_6_]
18:34:33,910 TRACE BasicExtractor:71 - found [2013-01-01 00:00:00.0] as column [dateFrom5_6_]
18:34:33,910 TRACE BasicExtractor:71 - found [2013-11-22 00:00:00.0] as column [dateTo5_6_]
18:34:33,910 TRACE BasicExtractor:71 - found [2] as column [salesman5_5_6_]
18:34:33,911 TRACE BasicExtractor:71 - found [3] as column [id3_0_]
18:34:33,911 TRACE BasicExtractor:66 - found [null] as column [id9_1_]
18:34:33,911 TRACE BasicExtractor:66 - found [null] as column [id3_2_]
18:34:33,911 TRACE BasicExtractor:66 - found [null] as column [id2_3_]
18:34:33,911 TRACE BasicExtractor:66 - found [null] as column [id6_4_]
18:34:33,912 TRACE BasicExtractor:66 - found [null] as column [id3_5_]
18:34:33,912 TRACE BasicExtractor:71 - found [2] as column [id5_6_]
18:34:33,912 TRACE BasicExtractor:71 - found [true] as column [active3_0_]
18:34:33,912 TRACE BasicExtractor:71 - found [Dent] as column [lastname3_0_]
18:34:33,912 TRACE BasicExtractor:71 - found [Arthur] as column [name3_0_]
18:34:33,913 TRACE BasicExtractor:71 - found [2013-12-20 20:17:34.0] as column [creation2_5_6_]
18:34:33,913 TRACE BasicExtractor:71 - found [2013-01-01 00:00:00.0] as column [dateFrom5_6_]
18:34:33,913 TRACE BasicExtractor:71 - found [2013-11-22 00:00:00.0] as column [dateTo5_6_]
18:34:33,914 TRACE BasicExtractor:71 - found [3] as column [salesman5_5_6_]
18:34:33,914 DEBUG AbstractBatcher:433 - about to close ResultSet (open ResultSets: 1, globally: 1)
18:34:33,914 DEBUG AbstractBatcher:418 - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
18:34:33,914 TRACE AbstractBatcher:562 - closing statement
18:34:33,923 DEBUG AbstractBatcher:410 - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)

这让我觉得它可能与 sql 查询有关，尽管这如何解释仅加载第一个注册表的事实？ =\

最佳答案

已解决。这是一个映射问题。添加适当的连接列并重新映射数据库就可以了。

所以，修改后的 Aditional 类现在是。

@Entity
public class Aditional implements Serializable {
@Transient
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;
@Column(nullable=false)
private Date dateCreation;
@Column(nullable=false)
private Date dateFrom;
@Column(nullable=false)
private Date dateTo;
@ManyToOne
private Salesman salesman;
@OneToOne
@JoinColumn(name="salesBonus_id")
private SalesBonus salesBonusRegistry;
@ManyToMany(cascade=CascadeType.ALL, fetch= FetchType.EAGER)
@Fetch(value = FetchMode.SUBSELECT)
private List<ProductBonus> productBonuses;
@OneToOne
@JoinColumn(name="salesmanPrize_id")
private Prize bestSalesman;
@OneToOne
@JoinColumn(name="campaignPrize_id")
private Prize productCampaign;

关于java - Hibernate 仅从数据库中检索第一条记录，其余为空，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22622085/

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