以前一直用jdbc做开发,取出的数据放在为每个表建立的数据类中,想放表的哪几个字段就放哪几个
现在想学学hibernate,用oracle的原生sql想取出一个表中的两列:
String selectTopicSql = "select topic,sectorname from article order by topic desc";
query = session.createSQLQuery(selectTopicSql1).setResultTransformer(Transformers.aliasToBean(Article.class));
Article.java就是hibernate对表ARTICLE的映射类,其配置文件如下:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
name="Article"
table="ARTICLE"
>
false
name="topic"
column="TOPIC"
type="string">
name="Sectorname"
column="SECTORNAME"
type="string"
not-null="true"
length="40"
/>
name="Contents"
column="CONTENTS"
type="string"
/>
name="Keyword"
column="KEYWORD"
type="string"
length="40"
/>
name="Source"
column="SOURCE"
type="string"
length="100"
/>
name="Pageview"
column="PAGEVIEW"
type="integer"
length="10"
/>
name="Score"
column="SCORE"
type="big_decimal"
length="2"
/>
name="Createtime"
column="CREATETIME"
type="date"
length="7"
update="false"
/>
name="Updatetime"
column="UPDATETIME"
type="date"
length="7"
update="false"
/>
该配置文件在执行全字段检索没有问题,现在只取topic,sectorname就报错:
Exception in thread "main" org.hibernate.PropertyNotFoundException: Could not find setter for TOPIC on class test.Article
at org.hibernate.property.ChainedPropertyAccessor.getSetter(ChainedPropertyAccessor.java:68)
at org.hibernate.transform.AliasToBeanResultTransformer.transformTuple(AliasToBeanResultTransformer.java:87)
at org.hibernate.hql.HolderInstantiator.instantiate(HolderInstantiator.java:92)
at org.hibernate.loader.custom.CustomLoader.getResultList(CustomLoader.java:353)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
at org.hibernate.loader.Loader.list(Loader.java:2120)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:312)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1722)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:165)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:175)
at com.struts_learn.dao.ArticleDAO.selectTopic(ArticleDAO.java:58)
at com.struts_learn.dao.ArticleDAO.main(ArticleDAO.java:206)
看了源码没看明白,如果另外再写一个jdbc那种数据类,何必用hibernate的映射类,如果不这样是不是就不能只取两个字段?我那个表的其他字段有很大的,不想全取出来,一直听说hibernate是持久层牛X框架,今日一见实在是失望,搞这么个东西在jdbc不用10分钟,竟然在hibernate里搞了半天也没能用映射类Article.java实现!
希望有对hibernate老手指点下!
package test;
import test.base.BaseArticle;
import java.math.*;
public class Article extends BaseArticle {
private static final long serialVersionUID = 1L;
/*[CONSTRUCTOR MARKER BEGIN]*/
public Article () {
super();
}
/**
* Constructor for primary key
*/
public Article (java.lang.String topic) {
super(topic);
}
/**
* Constructor for required fields
*/
public Article (
java.lang.String topic,
java.lang.String sectorname,
java.lang.String contents,
java.lang.String keyword,
java.lang.String source,
java.lang.Integer pageview,
java.math.BigDecimal score,
java.util.Date createtime,
java.util.Date updatetime) {
super (
topic,
sectorname,
contents,
keyword,
source,
pageview,
score,
createtime,
updatetime);
}
/*[CONSTRUCTOR MARKER END]*/
}
package test.base;
import java.io.Serializable;
/**
- This is an object that contains data related to the ARTICLE table.
- Do not modify this class because it will be overwritten if the configuration file
- related to this class is modified. *
- @hibernate.class
- table="ARTICLE" */
public abstract class BaseArticle implements Serializable {
public static String REF = "Article";
public static String PROP_PAGEVIEW = "Pageview";
public static String PROP_KEYWORD = "Keyword";
public static String PROP_TOPIC = "Topic";
public static String PROP_UPDATETIME = "Updatetime";
public static String PROP_SCORE = "Score";
public static String PROP_CONTENTS = "Contents";
public static String PROP_CREATETIME = "Createtime";
public static String PROP_SOURCE = "Source";
public static String PROP_SECTORNAME = "Sectorname";
// constructors
public BaseArticle () {
initialize();
}
/**
* Constructor for primary key
*/
public BaseArticle (java.lang.String topic) {
this.setTopic(topic);
initialize();
}
/**
* Constructor for required fields
*/
public BaseArticle (
java.lang.String topic,
java.lang.String sectorname,
java.lang.String contents,
java.lang.String keyword,
java.lang.String source,
java.lang.Integer pageview,
java.math.BigDecimal score,
java.util.Date createtime,
java.util.Date updatetime) {
this.setTopic(topic);
this.setSectorname(sectorname);
this.setContents(contents);
this.setKeyword(keyword);
this.setSource(source);
this.setPageview(pageview);
this.setScore(score);
this.setCreatetime(createtime);
this.setUpdatetime(updatetime);
initialize();
}
protected void initialize () {}
private int hashCode = Integer.MIN_VALUE;
// primary key
private java.lang.String topic;
// fields
private java.lang.String sectorname;
private java.lang.String contents;
private java.lang.String keyword;
private java.lang.String source;
private java.lang.Integer pageview;
private java.math.BigDecimal score;
private java.util.Date createtime;
private java.util.Date updatetime;
/**
* Return the unique identifier of this class
* @hibernate.id
* generator-class="native"
* column="TOPIC"
*/
public java.lang.String getTopic () {
return topic;
}
/**
* Set the unique identifier of this class
* @param topic the new ID
*/
public void setTopic (java.lang.String topic) {
this.topic = topic;
this.hashCode = Integer.MIN_VALUE;
}
/**
* Return the value associated with the column: SECTORNAME
*/
public java.lang.String getSectorname () {
return sectorname;
}
/**
* Set the value related to the column: SECTORNAME
* @param sectorname the SECTORNAME value
*/
public void setSectorname (java.lang.String sectorname) {
this.sectorname = sectorname;
}
/**
* Return the value associated with the column: CONTENTS
*/
public java.lang.String getContents () {
return contents;
}
/**
* Set the value related to the column: CONTENTS
* @param contents the CONTENTS value
*/
public void setContents (java.lang.String contents) {
this.contents = contents;
}
/**
* Return the value associated with the column: KEYWORD
*/
public java.lang.String getKeyword () {
return keyword;
}
/**
* Set the value related to the column: KEYWORD
* @param keyword the KEYWORD value
*/
public void setKeyword (java.lang.String keyword) {
this.keyword = keyword;
}
/**
* Return the value associated with the column: SOURCE
*/
public java.lang.String getSource () {
return source;
}
/**
* Set the value related to the column: SOURCE
* @param source the SOURCE value
*/
public void setSource (java.lang.String source) {
this.source = source;
}
/**
* Return the value associated with the column: PAGEVIEW
*/
public java.lang.Integer getPageview () {
return pageview;
}
/**
* Set the value related to the column: PAGEVIEW
* @param pageview the PAGEVIEW value
*/
public void setPageview (java.lang.Integer pageview) {
this.pageview = pageview;
}
/**
* Return the value associated with the column: SCORE
*/
public java.math.BigDecimal getScore () {
return score;
}
/**
* Set the value related to the column: SCORE
* @param score the SCORE value
*/
public void setScore (java.math.BigDecimal score) {
this.score = score;
}
/**
* Return the value associated with the column: CREATETIME
*/
public java.util.Date getCreatetime () {
return createtime;
}
/**
* Set the value related to the column: CREATETIME
* @param createtime the CREATETIME value
*/
public void setCreatetime (java.util.Date createtime) {
this.createtime = createtime;
}
/**
* Return the value associated with the column: UPDATETIME
*/
public java.util.Date getUpdatetime () {
return updatetime;
}
/**
* Set the value related to the column: UPDATETIME
* @param updatetime the UPDATETIME value
*/
public void setUpdatetime (java.util.Date updatetime) {
this.updatetime = updatetime;
}
public boolean equals (Object obj) {
if (null == obj) return false;
if (!(obj instanceof test.Article)) return false;
else {
test.Article article = (test.Article) obj;
if (null == this.getTopic() || null == article.getTopic()) return false;
else return (this.getTopic().equals(article.getTopic()));
}
}
public int hashCode () {
if (Integer.MIN_VALUE == this.hashCode) {
if (null == this.getTopic()) return super.hashCode();
else {
String hashStr = this.getClass().getName() + ":" + this.getTopic().hashCode();
this.hashCode = hashStr.hashCode();
}
}
return this.hashCode;
}
public String toString () {
return super.toString();
}
}
