1.hql条件查询:Object,hbm

最新推荐文章于 2021-10-19 17:05:02 发布

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本文详细介绍了使用Hibernate框架实现的班级与学生之间的关联映射，包括实体类的设计、属性设置及XML配置文件的具体内容。通过Java实体类和Hibernate的XML映射文件，实现了班级与学生的一对多关系。

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package com.bjpowernode.hibernate;

import java.util.Set;

public class Classes {
	
	private int id;
	
	private String name;
	
	private Set students;

	public int getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Set getStudents() {
		return students;
	}

	public void setStudents(Set students) {
		this.students = students;
	}
	
}

<?xml version="1.0"?>
<!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.bjpowernode.hibernate.Classes" table="t_classes">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<set name="students" inverse="true">
			<!-- 
			<key column="classesid" not-null="true"/>
			 -->
			 <key column="classesid"/>
			<one-to-many class="com.bjpowernode.hibernate.Student"/>
		</set>
	</class>
</hibernate-mapping>

package com.bjpowernode.hibernate;

import java.util.Date;

public class Student {

	private int id;
	
	private String name;

	private Date createTime;
	
	private Classes classes;
	
	public Student() {
	}

	public Student(int id, String name) {
		this.id = id;
		this.name = name;
	}
	
	public int getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Classes getClasses() {
		return classes;
	}

	public void setClasses(Classes classes) {
		this.classes = classes;
	}

	public Date getCreateTime() {
		return createTime;
	}

	public void setCreateTime(Date createTime) {
		this.createTime = createTime;
	}
}

<?xml version="1.0"?>
<!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.bjpowernode.hibernate.Student" table="t_student">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<property name="createTime"/>
		<many-to-one name="classes" column="classesid"/>
		<filter name="testFilter" condition="id < :myid"></filter>
	</class>
	
	<query name="queryStudent">
		<![CDATA[
			select s from Student s where s.id <?
		]]>
	</query>	
	
	<filter-def name="testFilter">
		<filter-param type="integer" name="myid"/>
	</filter-def>
</hibernate-mapping>