HibernateTemplate Composite Key获取值为null

Question

我有一个表有复合键'rid'和'sid'。

为此我已经使用hibernate注释制作了以下bean：

WBList.java
============
@Entity
@IdClass(WBListPK.class)
public class WBList {
    private int rid;
    private int sid;
    private String wb;

    @Id
    @JoinColumn(name="rid")
    public int getRid() {
        return rid;
    }
    public void setRid(int rid) {
        this.rid = rid;
    }
    @Id
    @JoinColumn(name="sid")
    public int getSid() {
        return sid;
    }
    public void setSid(int sid) {
        this.sid = sid;
    }
    @Column(name="wb")
    public String getWb() {
        return wb;
    }
    public void setWb(String wb) {
        this.wb = wb;
    }
}

WBListPK.java有以下代码：

@Embeddable
public class WBListPK implements Serializable {
    private int rid;
    private int sid;
    private String wb;

    public int getRid() {
        return rid;
    }
    public void setRid(int rid) {
        this.rid = rid;
    }
    public int getSid() {
        return sid;
    }
    public void setSid(int sid) {
        this.sid = sid;
    }
    public String getWb() {
        return wb;
    }
    public void setWb(String wb) {
        this.wb = wb;
    }
}

我的WBListDao有以下方法：

//Some other code ...
public WBList getWBListById(WBListPK wbListPK) {
        return (WBList) this.hibernateTemplate.get(WBList.class,wbListPK);
    }

以下是我的控制器代码：

WBList wbList = new WBList();
WBListPK wbListPK = new WBListPK();
wbListPK.setRid(1);
wbListPK.setSid(7);
wbList = this.wbListSecurityProcessor.getWBListById(wbListPK);
System.out.println("Wblist = "+wbList);

当我执行上面的代码时，wbList获取空值..

如果有人有任何解决方案，请帮助..

提前致谢...

Answer 1

我不确定分配两个@Id列是否有效。 更好地了解@EmbeddedId

Answer 2

获得解决方案，以及在Hibernate中实现Composite Key的其他方式......

以下是说明解决方案的代码：

WBList.java

@Entity
public class WBList {

    private WBListPK id;
    private String wb;
    private Integer rid;
    private Integer sid;

    @Id
    public WBListPK getId() {
        return id;
    }
    public void setId(WBListPK id) {
        this.id = id;
    }
    @Column(name="wb")
    public String getWb() {
        return wb;
    }
    public void setWb(String wb) {
        this.wb = wb;
    }
}

WBListPK.java

@Embeddable
public class WBListPK implements Serializable {

    private int rid;
    private int sid;

    public WBListPK() {
    }

    public WBListPK(Integer rid, Integer sid) {
        this.rid = rid;
        this.sid = sid;
    }

    public int getRid() {
        return rid;
    }

    public void setRid(int rid) {
        this.rid = rid;
    }

    public int getSid() {
        return sid;
    }

    public void setSid(int sid) {
        this.sid = sid;
    }

控制器代码：

WBList wbList = new WBList();
wbList.setWb("d");
WBListPK wbListPK = new WBListPK(30,40);
wbList.setId(wbListPK);
this.wbListSecurityProcessor.save(wbList);