java - HibernateTemplate 复合键获取值 null

Question

我有一张表，其中包含复合键“rid”和“sid”。

为此，我制作了以下 bean 来映射 hibernate 注释:

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 Controller 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，请帮忙..

提前致谢...

Answer 1

我不确定分配两个 @Id 列是否有效。更好地看看@EmbeddedId