Question

我有一个Java类，可将信息链接到数据库中的表。

类Fmpolicy.java：

  @Entity
    @Table(name = "fmpolicy")
    public class Fmpolicy implements Serializable {
        private static final long serialVersionUID = 1L;
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        @Column(name = "FMPID")
        private Long fmpid;
        @Basic(optional = false)
        @NotNull
        @Column(name = "NODEID")
        private long nodeid;
        @Basic(optional = false)
        @NotNull
        @Column(name = "FMPUGID")
        private long fmpugid;
        @Basic(optional = false)
        @NotNull
        @Column(name = "FMPUGTYPE")
        private int fmpugtype;
        @Basic(optional = false)
        @NotNull
        @Column(name = "FMPVIEW")
        private boolean fmpview;
        @Basic(optional = false)
        @NotNull
        @Column(name = "FMPREVISE")
        private boolean fmprevise;
        @Basic(optional = false)
        @NotNull
        @Column(name = "FMPDOWNLOAD")
        private boolean fmpdownload;

        @ManyToOne(fetch=FetchType.EAGER)
        @JoinColumn(referencedColumnName="nodeid",  name="NODEID", updatable=false, insertable=false)
        private Node fmn;

        public Fmpolicy() {
        }

        public Fmpolicy(Long fmpid) {
            this.fmpid = fmpid;
        }

        public Fmpolicy(Long fmpid, long nodeid, long fmpugid, int fmpugtype, boolean fmpview, boolean fmprevise, boolean fmpdownload) {
            this.fmpid = fmpid;
            this.nodeid = nodeid;
            this.fmpugid = fmpugid;
            this.fmpugtype = fmpugtype;
            this.fmpview = fmpview;
            this.fmprevise = fmprevise;
            this.fmpdownload = fmpdownload;
        }

        public Long getFmpid() {
            return fmpid;
        }

        public void setFmpid(Long fmpid) {
            this.fmpid = fmpid;
        }

        public long getNodeid() {
            return nodeid;
        }

        public void setNodeid(long nodeid) {
            this.nodeid = nodeid;
        }
............

上面只是其中的一部分。然后，我有一个JSP页面，我想从此Fmpolicy创建实例对象。

Jsp页面：

    long nodeID = Long.parseLong(request.getParameter("nodeID"));
        long graphID = Long.parseLong(request.getParameter("graphID"));


        Fmpolicy fp = new Fmpolicy(nodeID);
        fp.getNodeid();
........
//this part should be able to check FMPVIEW column for it's nodeID respectively rather than FMPID
 if(fp.getFmpview(nodeID)==true) {
// do something if true

}

问题是当我尝试调试它时，nodeID的值正确返回，但由 fmpid 代替。例如，nodeID = 123，但它将值传递给了 fmpid = 123 。

因此，我无法检索要实现目标的特定ID。如何正确将nodeID传递给对象，以便检查条件？

我做错了什么？

Answer 1

您拥有的单个arg构造函数将以fmpid作为参数并将其分配给private Long fmpid;

 public Fmpolicy(Long fmpid) {
        this.fmpid = fmpid;
    }

要设置nodeId，请创建一个没有arg构造函数的对象，并使用setter方法设置nodeId

Fmpolicy fp = new Fmpolicy();
fp.setNodeid(nodeID);

java-如何从其他类中检索ID？

1 个答案: