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我是休眠新手并尝试使用标准。我坚持从 2 个表中获取结果,即主外键实际存在的表。

我有 Carpooler 和 SourceToDestinationDetails DTO,现在根据用户搜索数据,我想填充包含 SourceToDestinationDetails 的 Carpooler 对象,但我没有得到它,也不知道如何使用 Criteria API 来完成。

public class Carpooler implements Serializable{

    private long carpoolerId;
    private String drivingLicenceNumber=null;
    private String userType=null;![enter image description here][1]
    private User user=null;
    private List<VehicleDetails> listOfVehicleDetails=null;
    private List<SourceToDestinationDetails> listOfSourceToDestinationDetails=null;
    private Date carpoolerCreationDate;
}

public class SourceToDestinationDetails implements Serializable{

    private static final long serialVersionUID = -7158985673279885525L;

    private long sourceToDestinationId;
    private String sourcePlace=null;
    private String destinationPlace=null;
    private String inBetweenPlaces=null;

    private String sourceLeavingTime=null;
}

在此处输入图像描述 在此处输入图像描述 这是我写的,

Criteria criteria1 = getSession().createCriteria(SourceToDestinationDetails.class);
criteria1.add(Restrictions.like("sourcePlace", "%" + from + "%"));
criteria1.add(Restrictions.like("destinationPlace", "%" + to + "%"));
List<SourceToDestinationDetails> listOfExactMatchCarpooler = criteria1.list();  

通过上面的 Criteria API,我只获取 SourceToDestinationDetails DTO 记录,但现在我也需要拼车记录,我不知道如何在 SourceToDestinationDetails 表中获取匹配 Carpooler_id 的拼车记录。

我的意思是如果用户给出,

String from = "Bellandur";
    String to = "Silk Board";

那么结果应该是List<Carpooler>对象,其中包含所有匹配的 SourceToDestinationDetails 列表。

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1 回答 1

1

你可以通过Annotations做到这一点。您可以在SourceToDestinationDetails类中使用@OneToMany注释,如下所示,

public class SourceToDestinationDetails implements Serializable{

    private static final long serialVersionUID = -7158985673279885525L;
    @Column
    private long sourceToDestinationId;
    @Column
    private String sourcePlace=null;
    @Column
    private String destinationPlace=null;
    @Column
    private String inBetweenPlaces=null;
    @Column
    private String sourceLeavingTime=null;

    @OneToMany(mappedBy = "carpooler_id", cascade = CascadeType.ALL)
    private Set<Carpooler> carpoolers;
}

如果您想使用HIBERNATE XML实现相同的目标。如下声明 XML

  <set name="carpoolers" table="source_destination" 
            inverse="true" lazy="true" fetch="select">
        <key>
            <column name="carpooler_id" not-null="true" />
        </key>
        <one-to-many class="com.test.Carpooler" />
    </set>

在这种情况下,您的模型类将是

public class SourceToDestinationDetails implements Serializable{

    private static final long serialVersionUID = -7158985673279885525L;

    private long sourceToDestinationId;
    private String sourcePlace=null;
    private String destinationPlace=null;
    private String inBetweenPlaces=null;

    private String sourceLeavingTime=null;
    private Set<StockDailyRecord> carpoolers = 
                new HashSet<StockDailyRecord>();
}

我通常更喜欢注解而不是丑陋的 XML

于 2012-12-25T05:21:33.840 回答