hibernate映射文件无主键

Hibernate无主键配置文件编写
2011年07月12日 星期二 09:46 A.M.

Hibernate无主键配置文件编写

1.环境:jdk1.4+hibernate2.0+weblogic8

一般情况下，我们建的表都会有主键，然后根据Hibernate的配置文件编写条件 有一个主键key，剩下的是Property的属性，对应的PO类也就是一个普通的javabean.然后根据HIBERNATE的轻量级session进行保存修改的操作等。

今天遇到了一张表，是没有主键的表，是一张从别处导过来的表。但是我需要用hibernate来进行操作。中间遇到一些曲折，最后觉得HIBERNATE不会搞的太麻烦吧，经过一篇博文的启发，终于找到了一种简洁的做法。

第一步:建表(略，无主键)

第二部:进行配置文件以及PO类的编写。

其中的做法就是没有主键，所以把一条记录看成一个主键，即组合主键<composite-id>

。

配置文件如下:

<hibernate-mapping>

<class name="com.cqgl.po.SaI18nLimitRulesPO" table="SA_I18N_LIMIT_RULES">

<composite-id>

<key-property name="aircompanyCode" type="java.lang.String">

<column name="AIRCOMPANY_CODE" />

</key-property>

<key-property name="aircompanyName" type="java.lang.String">

<column name="AIRCOMPANY_NAME" />

</key-property>

<key-property name="canbinClass" type="java.lang.String">

<column name="CANBIN_CLASS" />

</key-property>

<key-property name="discountFrom">

<column name="DISCOUNT_FROM" />

</key-property>

<key-property name="discountTo">

<column name="DISCOUNT_TO" />

</key-property>

<key-property name="refundTicketsRule" type="java.lang.String">

<column name="REFUND_TICKETS_RULE" />

</key-property>

<key-property name="refundTicketsRuleEn" type="java.lang.String">

<column name="REFUND_TICKETS_RULE_EN" />

</key-property>

<key-property name="changeDateRule" type="java.lang.String">

<column name="CHANGE_DATE_RULE" />

</key-property>

<key-property name="changeDateRuleEn" type="java.lang.String">

<column name="CHANGE_DATE_RULE_EN" />

</key-property>

<key-property name="endorsementRule" type="java.lang.String">

<column name="ENDORSEMENT_RULE" />

</key-property>

<key-property name="endorsementRuleEn" type="java.lang.String">

<column name="ENDORSEMENT_RULE_EN" />

</key-property>

<key-property name="remark" type="java.lang.String">

<column name="REMARK" />

</key-property>

<key-property name="createTime" type="java.util.Date">

<column name="CREATE_TIME" />

</key-property>

<key-property name="createUserId" type="java.lang.String">

<column name="CREATE_USER_ID" />

</key-property>

<key-property name="updateTime" type="java.util.Date">

<column name="UPDATE_TIME" />

</key-property>

<key-property name="updateUserId" type="java.lang.String">

<column name="UPDATE_USER_ID" />

</key-property>

</composite-id>

</class>

</hibernate-mapping>

第三部:重写实体类中的OBJECT的equals方法和hashCode并且每个实体要实现java.io.Serializable接口

JAVA文件如下:

package com.cqgl.po;

import java.util.Date;

public class SaI18nLimitRulesPO implements java.io.Serializable {

private String aircompanyCode;

private String aircompanyName;

private String canbinClass;

private String discountFrom;

private String discountTo;

private String refundTicketsRule;

private String refundTicketsRuleEn;

private String changeDateRule;

private String changeDateRuleEn;

private String endorsementRule;

private String endorsementRuleEn;

private String remark;

private Date createTime;

private String createUserId;

private Date updateTime;

private String updateUserId;

public String getAircompanyCode() {

return this.aircompanyCode;

}

public void setAircompanyCode(String aircompanyCode) {

this.aircompanyCode = aircompanyCode;

}

public String getAircompanyName() {

return this.aircompanyName;

}

public void setAircompanyName(String aircompanyName) {

this.aircompanyName = aircompanyName;

}

public String getCanbinClass() {

return this.canbinClass;

}

public void setCanbinClass(String canbinClass) {

this.canbinClass = canbinClass;

}

public String getDiscountFrom() {

return this.discountFrom;

}

public void setDiscountFrom(String discountFrom) {

this.discountFrom = discountFrom;

}

public String getDiscountTo() {

return this.discountTo;

}

public void setDiscountTo(String discountTo) {

this.discountTo = discountTo;

}

public String getRefundTicketsRule() {

return this.refundTicketsRule;

}

public void setRefundTicketsRule(String refundTicketsRule) {

this.refundTicketsRule = refundTicketsRule;

}

public String getRefundTicketsRuleEn() {

return this.refundTicketsRuleEn;

}

public void setRefundTicketsRuleEn(String refundTicketsRuleEn) {

this.refundTicketsRuleEn = refundTicketsRuleEn;

}

public String getChangeDateRule() {

return this.changeDateRule;

}

public void setChangeDateRule(String changeDateRule) {

this.changeDateRule = changeDateRule;

}

public String getChangeDateRuleEn() {

return this.changeDateRuleEn;

}

public void setChangeDateRuleEn(String changeDateRuleEn) {

this.changeDateRuleEn = changeDateRuleEn;

}

public String getEndorsementRule() {

return this.endorsementRule;

}

public void setEndorsementRule(String endorsementRule) {

this.endorsementRule = endorsementRule;

}

public String getEndorsementRuleEn() {

return this.endorsementRuleEn;

}

public void setEndorsementRuleEn(String endorsementRuleEn) {

this.endorsementRuleEn = endorsementRuleEn;

}

public String getRemark() {

return this.remark;

}

public void setRemark(String remark) {

this.remark = remark;

}

public Date getCreateTime() {

return this.createTime;

}

public void setCreateTime(Date createTime) {

this.createTime = createTime;

}

public String getCreateUserId() {

return this.createUserId;

}

public void setCreateUserId(String createUserId) {

this.createUserId = createUserId;

}

public Date getUpdateTime() {

return this.updateTime;

}

public void setUpdateTime(Date updateTime) {

this.updateTime = updateTime;

}

public String getUpdateUserId() {

return this.updateUserId;

}

public void setUpdateUserId(String updateUserId) {

this.updateUserId = updateUserId;

}

// 注意这种情况下 我们需要重写equals和hashCode

public boolean equals(Object object) {

return true;

}

public int hashCode() {

return 1;

}

}

进行Hibernate的config文件配置，把实体类加入到映射中去，就可以进行到相应的查询操作了。更新修改操作还没有尝试，可能还是需要一些配置吧。