用hibernateTool生成pojo类时,多了一个 表名Id.java 的pojo,为什么

Question

比如数据库中表为table.用hibernateTool生成pojo和hbm时,会产生一个 TableId.java和一个Table.java,为什么,
这时候如何插入数据,

Table.java:

public class Table implements java.io.Serializable {

private TableId id;

public Table() {
}
   ....

}

TableId.java中有数据库中表table 的实际属性,这时怎么操作,或者哪位提供个文档,我自己去看也行.
[b]问题补充：[/b]
Table里只有一个Id属性.
就算new一个,也一样,还是只有一个setId的方法,没有set其它属性的方法.
[b]问题补充：[/b]
首先对表示感谢.然后贴一下数据库设置.

bz_id char(1)
bz_name varchar(20)
idx smallint

CREATE TABLE [dbo].BZ NULL CONSTRAINT [DF_BZ_bz_id] DEFAULT (''),
[bz_name] varchar NULL CONSTRAINT [DF_BZ_bz_name] DEFAULT (''),
[idx] [smallint] NULL CONSTRAINT [DF_BZ_idx] DEFAULT (0)
) ON [PRIMARY]

里面没有设置主键.而且id和idx都允许空的,(因为业务要求不同,所以有两个ID.)
[b]问题补充：[/b]
下面是Bz.hbm.xml
[code="java"]
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

[/code]
[b]问题补充：[/b]
Bz.java
[code="java"]
package org.gaodi.bean;

// Generated 2009-11-11 23:23:08 by Hibernate Tools 3.2.4.GA

/**

• Bz generated by hbm2java
  */
  public class Bz implements java.io.Serializable {

  private BzId id;

  public Bz() {
  }

  public Bz(BzId id) {
  this.id = id;
  }

  public BzId getId() {
  return this.id;
  }

  public void setId(BzId id) {
  this.id = id;
  }

}
[/code]

BzId.java
[code="java"]
package org.gaodi.bean;

// Generated 2009-11-11 23:23:08 by Hibernate Tools 3.2.4.GA

/**

• BzId generated by hbm2java
  */
  public class BzId implements java.io.Serializable {

  private Character bzId;
  private String bzName;
  private Short idx;

  public BzId() {
  }

  public BzId(Character bzId, String bzName, Short idx) {
  this.bzId = bzId;
  this.bzName = bzName;
  this.idx = idx;
  }

  public Character getBzId() {
  return this.bzId;
  }

  public void setBzId(Character bzId) {
  this.bzId = bzId;
  }

  public String getBzName() {
  return this.bzName;
  }

  public void setBzName(String bzName) {
  this.bzName = bzName;
  }

  public Short getIdx() {
  return this.idx;
  }

  public void setIdx(Short idx) {
  this.idx = idx;
  }

  public boolean equals(Object other) {
  if ((this == other))
  return true;
  if ((other == null))
  return false;
  if (!(other instanceof BzId))
  return false;
  BzId castOther = (BzId) other;

  return ((this.getBzId() == castOther.getBzId()) || (this.getBzId() != null
          && castOther.getBzId() != null && this.getBzId().equals(
          castOther.getBzId())))
          && ((this.getBzName() == castOther.getBzName()) || (this
                  .getBzName() != null
                  && castOther.getBzName() != null && this.getBzName()
                  .equals(castOther.getBzName())))
          && ((this.getIdx() == castOther.getIdx()) || (this.getIdx() != null
                  && castOther.getIdx() != null && this.getIdx().equals(
                  castOther.getIdx())));
  

  }

  public int hashCode() {
  int result = 17;

  result = 37 * result
          + (getBzId() == null ? 0 : this.getBzId().hashCode());
  result = 37 * result
          + (getBzName() == null ? 0 : this.getBzName().hashCode());
  result = 37 * result
          + (getIdx() == null ? 0 : this.getIdx().hashCode());
  return result;
  

  }

}

[/code]

Answer 1

我知道你那个怎么回事了 你数据库表里的主键应该是两个以上吧？
先new 一个TableId，然后将TableId里的属性都set了，然后再建立一个table 执行UPDATE

TableId tableid=new TableId();
tableid.setXXX();
tableid.setXXX();
....
[color=red]Table t=new Table();
t.setTableId(tableid) ;[/color]

Session session=this.getSession();
Transaction tx = session.beginTransaction();
[color=red]session.update(t); [/color]
tx.commit();