hibernate对象关系映射的配置

一对一主键关联单双向

<?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 package="com.wepull.pojo">

    <class name="IdCard" table="t_idcard">

        <id name="id">

            <generator class="native"></generator>

        </id>

        <property name="name"></property>

        <!-- 双向配置如下 -->

        <one-to-one name="p"></one-to-one>

    </class>

</hibernate-mapping>

<hibernate-mapping package="com.wepull.pojo">

    <class name="Person" table="t_person">

        <id name="id">

            <generator class="foreign">

                <param name="property">i</param>

            </generator>

        </id>

        <property name="name"></property>

        <!-- person找Idcard  单向 -->

        <one-to-one name="i" constrained="true"></one-to-one>

    </class>

</hibernate-mapping>

一对一外键关联单双向

<?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 package="com.wepull.pojo">

    <class name="IdCard" table="t_idcard">

        <id name="id">

            <generator class="native"></generator>

        </id>

        <property name="name"></property>

        <!-- 双向配置    级联删除-->

        <one-to-one name="p" property-ref="i" cascade="delete"></one-to-one>

    </class>

</hibernate-mapping>

<hibernate-mapping package="com.wepull.pojo">

    <class name="Person" table="t_person">

        <id name="id">

            <generator class="native"></generator>

        </id>

        <property name="name"></property>

        <!-- person找Idcard  单向 -->

        <many-to-one name="i" unique="true"></many-to-one>

    </class>

</hibernate-mapping>

一对多/多对一

<?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 package="com.wepull.pojo">

    <class name="Student" table="t_student">

        <id name="id">

            <generator class="native"></generator>

        </id>

        <property name="name"></property>

        <!-- 多对一配置如下 -->

        <many-to-one name="c" class="Classes"></many-to-one>

    </class>

</hibernate-mapping>

<hibernate-mapping package="com.wepull.pojo">

    <class name="Classes" table="t_classes">

        <id name="id">

            <generator class="native"></generator>

        </id>

        <property name="name"></property>

        <!-- 一对多 -->

        <set name="s" inverse="true"><!-- 由学生管理 -->

        <!-- column:多的一方持有一的一方的外键字段 -->

            <key column="c"></key>

            <one-to-many class="Student" />

        </set>

    </class>

</hibernate-mapping>

多对多单双向

<hibernate-mapping package="com.wepull.pojo">

    <class name="Role" table="t_role">

        <id name="id">

            <generator class="native"></generator>

        </id>

        <property name="name"></property>

        <!-- 多对多 -->

        <set name="u" table="t_user_role">

            <key column="r"></key>

            <many-to-many class="User" column="u"></many-to-many>

        </set>

    </class>

</hibernate-mapping>

<hibernate-mapping package="com.wepull.pojo">

    <class name="User" table="t_user">

        <id name="id">

            <generator class="native"></generator>

        </id>

        <property name="name"></property>

        <!-- 多对多配置如下 -->

        <set name="r" table="t_user_role">

            <key column="u"></key>

            <many-to-many class="Role" column="r"></many-to-many>

        </set>

    </class>

</hibernate-mapping>

Annotation注解(多对一)

import javax.persistence.Entity;

import javax.persistence.FetchType;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.ManyToOne;

/**

 * @author fcs

 * 不能自动删除表

 * 多对一单向     多方持有一方的外键

 * 2014-8-24

 */

@Entity

public class Student {

    private int id;

    private String name;

    private Classes c;

    @ManyToOne(fetch=FetchType.LAZY)//延迟加载

    @JoinColumn(name="cid")//修改表字段名  防止自动生成sid

    public Classes getC() {

        return c;

    }

    public void setC(Classes c) {

        this.c = c;

    }

    @Id

    @GeneratedValue(strategy=GenerationType.IDENTITY)//主键自增长

    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;

    }

}

巴特西

hibernate对象关系映射的配置

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