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我已经开始学习HQL最近，并试图创建一个测试应用程序，看看它是如何工作..但是当我试图运行该项目，我看到重复的列正在创建NULL值它。hibernate自动创建重复列
这里是我的项目详情
我有这种结构{ID，insurance_name，invested_amount，investment_date}我已经创建一个表（保险）。
当我运行应用程序时，它创建了两个带有空值的附加列{id，insurance_name，invest_amount，investment_date，INSURANCE_AMOUNT，INSURANCE_DATE}，我不知道它们从哪里创建。
休眠配置文件：
<?xml version="1.0"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate4</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>
<mapping resource="insurance.hbm.xml"/>
</session-factory>
映射文件：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.roseindia.app.HQL.Insurance" table="INSURANCE">
<id name="id" type="long" column="ID">
<generator class="increment"></generator>
</id>
<property name="insuranceName">
<column name="INSURANCE_NAME"></column>
</property>
<property name="investmentAmount">
<column name="INSURANCE_AMOUNT"></column>
</property>
<property name="investmentDate">
<column name="INSURANCE_DATE"></column>
</property>
</class>
</hibernate-mapping>
POJO类：
public class Insurance {
private Long id;
private String insuranceName;
private Integer investmentAmount;
private Date investmentDate;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getInsuranceName() {
return insuranceName;
}
public void setInsuranceName(String insuranceName) {
this.insuranceName = insuranceName;
}
public Integer getInvestmentAmount() {
return investmentAmount;
}
public void setInvestmentAmount(Integer investmentAmount) {
this.investmentAmount = investmentAmount;
}
public Date getInvestmentDate() {
return investmentDate;
}
public void setInvestmentDate(Date investmentDate) {
this.investmentDate = investmentDate;
}
}
主类：
public class SelectClauseExample {
public static void main(String[] args) {
// TODO Auto-generated method stub
Session session =null;
try{
SessionFactory sessionFactory =new Configuration().configure().buildSessionFactory();
session= sessionFactory.openSession();
String SQL_QUERY="select insurance.id, insurance.insuranceName,insurance.investmentAmount,insurance.investmentDate from Insurance insurance";
Query query = session.createQuery(SQL_QUERY);
for (java.util.Iterator it = query.iterate(); it.hasNext();){
System.out.print("Inside for");
Object[] row = (Object[]) it.next();
System.out.println("ID: "+row[0]);
System.out.println("Name: "+row[1]);
System.out.println("Amount: "+row[2]);
System.out.println("Date: "+row[3]);
}
}catch(Exception e){
}finally{
session.flush();
session.close();
}
}
}
谢谢..它的工作..也有问题与我的映射文件..我映射不正确的列名映射文件中。 – user2954417