1.组建映射

可以存在一个表里面

Husband.java

package com.bjsxt.hibernate;

import javax.persistence.Embedded;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.JoinColumns;

import javax.persistence.OneToOne;

@Entity

public class Husband {

    private int id;

    private String name;

    private Wife wife;

    @Id

    @GeneratedValue

    public int getId() {

        return id;

    }

    public String getName() {

        return name;

    }

    @Embedded

    public Wife getWife() {

        return wife;

    }

    public void setId(int id) {

        this.id = id;

    }

    public void setName(String name) {

        this.name = name;

    }

    public void setWife(Wife wife) {

        this.wife = wife;

    }

}

Wife.java

package com.bjsxt.hibernate;

public class Wife {

    private String wifeName;

    private int age;

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String getWifeName() {

        return wifeName;

    }

    public void setWifeName(String name) {

        this.wifeName = name;

    }

}

HibernateORMappingTest.java

package com.bjsxt.hibernate;

import java.util.Date;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;

import org.hibernate.tool.hbm2ddl.SchemaExport;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

public class HibernateORMappingTest {

    private static SessionFactory sessionFactory;

    //@BeforeClass

    public static void beforeClass() {

            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();

    }

    //@AfterClass

    public static void afterClass() {

        sessionFactory.close();

    }

    @Test

    public void testSchemaExport() {

        new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);

    }

    public static void main(String[] args) {

        beforeClass();

    }

}

也可以使用XML

Husband.hbm.xml

<?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.bjsxt.hibernate.Husband" >

        <id name="id">

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

        </id>

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

        <component name="wife">

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

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

        </component>

    </class>

</hibernate-mapping>

如果两个对象有属性一致 可以更改属性名 或者使用注解更改 映射的字段名

多对多和一对多

在多的一方加外键

1.annotation

Group.java

package com.bjsxt.hibernate;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.Table;

@Entity

@Table(name="t_group")

public class Group {

    private int id;

    private String name;

    @Id

    @GeneratedValue

    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;

    }

}

User.java

package com.bjsxt.hibernate;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name="t_user")

public class User {

    private int id;

    private String name;

    private Group group;

    @ManyToOne

    public Group getGroup() {

        return group;

    }

    public void setGroup(Group group) {

        this.group = group;

    }

    @Id

    @GeneratedValue

    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;

    }

}

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>

        <property name="connection.username">root</property>

        <property name="connection.password">bjsxt</property>

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

       <!--

        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

        <property name="connection.url">jdbc:oracle:thin:@localhost::SXT</property>

        <property name="connection.username">scott</property>

        <property name="connection.password">tiger</property>

          <property name="dialect">org.hibernate.dialect.OracleDialect</property>

       -->

        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size"></property>

        <!-- Enable Hibernate's automatic session context management -->

        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->

        <property name="show_sql">true</property>

        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup

        <property name="hbm2ddl.auto">update</property>

         -->

        <mapping class="com.bjsxt.hibernate.Group"/>

        <mapping class="com.bjsxt.hibernate.User"/>
 <!--  
<mapping resource="com/bjsxt/hibernate/Group.hbm.xml"/> 
<mapping resource="com/bjsxt/hibernate/User.hbm.xml"/>
 -->
</session-factory> </hibernate-configuration>

test.java

package com.bjsxt.hibernate;

import java.util.Date;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;

import org.hibernate.tool.hbm2ddl.SchemaExport;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

public class HibernateORMappingTest {

    private static SessionFactory sessionFactory;

    //@BeforeClass

    public static void beforeClass() {

            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();

    }

    //@AfterClass

    public static void afterClass() {

        sessionFactory.close();

    }

    @Test

    public void testSchemaExport() {

        new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);

    }

    public static void main(String[] args) {

        beforeClass();

    }

}

2.xml

Group.hbm.xml

<?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.bjsxt.hibernate.Group" table="t_group">

        <id name="id">

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

        </id>

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

    </class>

</hibernate-mapping>

User.hbm.xml

<?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.bjsxt.hibernate.User" table="t_user">

        <id name="id">

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

        </id>

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

        <many-to-one name="group" column="groupId" />

    </class>

</hibernate-mapping>

hibernate.cfg.xml

    <?xml version='1.0' encoding='utf-8'?>

    <!DOCTYPE hibernate-configuration PUBLIC

            "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

            "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

    <hibernate-configuration>

        <session-factory>

            <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

            <property name="connection.url">jdbc:mysql://localhost/hibernate</property>

            <property name="connection.username">root</property>

            <property name="connection.password">bjsxt</property>

            <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

           <!--

            <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

            <property name="connection.url">jdbc:oracle:thin:@localhost::SXT</property>

            <property name="connection.username">scott</property>

            <property name="connection.password">tiger</property>

              <property name="dialect">org.hibernate.dialect.OracleDialect</property>

           -->

            <!-- JDBC connection pool (use the built-in) -->

            <property name="connection.pool_size"></property>

            <!-- Enable Hibernate's automatic session context management -->

            <property name="current_session_context_class">thread</property>

            <!-- Disable the second-level cache  -->

            <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

            <!-- Echo all executed SQL to stdout -->

            <property name="show_sql">true</property>

            <property name="format_sql">true</property>

            <!-- Drop and re-create the database schema on startup

            <property name="hbm2ddl.auto">update</property>

             -->

            <!--

            <mapping class="com.bjsxt.hibernate.Group"/>

            <mapping class="com.bjsxt.hibernate.User"/>

             -->

             <mapping resource="com/bjsxt/hibernate/Group.hbm.xml"/>

             <mapping resource="com/bjsxt/hibernate/User.hbm.xml"/>

        </session-factory>

    </hibernate-configuration>

test.java一致

一对多的单向关联

在多的方向加外键

Group.java

package com.bjsxt.hibernate;

import java.util.HashSet;

import java.util.Set;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="t_group")

public class Group {

    private int id;

    private String name;

    private Set<User> users = new HashSet<User>();

    @Id

    @GeneratedValue

    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;

    }

    @OneToMany

    @JoinColumn(name="groupId")

    public Set<User> getUsers() {

        return users;

    }

    public void setUsers(Set<User> users) {

        this.users = users;

    }

}

如果不加@JoinColumv 变会生成多对多的关系

User.java

package com.bjsxt.hibernate;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name="t_user")

public class User {

    private int id;

    private String name;

    @Id

    @GeneratedValue

    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;

    }

}

测试

package com.bjsxt.hibernate;

import java.util.Date;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;

import org.hibernate.tool.hbm2ddl.SchemaExport;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

public class HibernateORMappingTest {

    private static SessionFactory sessionFactory;

    //@BeforeClass

    public static void beforeClass() {

            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();

    }

    //@AfterClass

    public static void afterClass() {

        sessionFactory.close();

    }

    @Test

    public void testSchemaExport() {

        new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);

    }

    public static void main(String[] args) {

        beforeClass();

    }

}

2  xml

Group.hbm.xml

<?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.bjsxt.hibernate.Group" table="t_group">

        <id name="id">

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

        </id>

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

        <set name="users">

            <key column="groupId"></key>

            <one-to-many class="com.bjsxt.hibernate.User"/>

        </set>

    </class>

</hibernate-mapping>

User.hbm.xml

<?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.bjsxt.hibernate.User" table="t_user">

        <id name="id">

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

        </id>

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

    </class>

</hibernate-mapping>

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>

        <property name="connection.username">root</property>

        <property name="connection.password">bjsxt</property>

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

       <!--

        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

        <property name="connection.url">jdbc:oracle:thin:@localhost::SXT</property>

        <property name="connection.username">scott</property>

        <property name="connection.password">tiger</property>

          <property name="dialect">org.hibernate.dialect.OracleDialect</property>

       -->

        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size"></property>

        <!-- Enable Hibernate's automatic session context management -->

        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->

        <property name="show_sql">true</property>

        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup

        <property name="hbm2ddl.auto">update</property>

         -->

        <!--

         <mapping class="com.bjsxt.hibernate.Group"/>

        <mapping class="com.bjsxt.hibernate.User"/>

         -->

        <mapping resource="com/bjsxt/hibernate/Group.hbm.xml"/>

         <mapping resource="com/bjsxt/hibernate/User.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

一对多双向

Group.java

package com.bjsxt.hibernate;

import java.util.HashSet;

import java.util.Set;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="t_group")

public class Group {

    private int id;

    private String name;

    private Set<User> users = new HashSet<User>();

    @Id

    @GeneratedValue

    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;

    }

    @OneToMany(mappedBy="group")

    public Set<User> getUsers() {

        return users;

    }

    public void setUsers(Set<User> users) {

        this.users = users;

    }

}

User.java

package com.bjsxt.hibernate;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.Id;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name="t_user")

public class User {

    private int id;

    private String name;

    private Group group;

    @ManyToOne

    public Group getGroup() {

        return group;

    }

    public void setGroup(Group group) {

        this.group = group;

    }

    @Id

    @GeneratedValue

    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;

    }

}

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>

        <property name="connection.username">root</property>

        <property name="connection.password">bjsxt</property>

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

       <!--

        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

        <property name="connection.url">jdbc:oracle:thin:@localhost::SXT</property>

        <property name="connection.username">scott</property>

        <property name="connection.password">tiger</property>

          <property name="dialect">org.hibernate.dialect.OracleDialect</property>

       -->

        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size"></property>

        <!-- Enable Hibernate's automatic session context management -->

        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->

        <property name="show_sql">true</property>

        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup

        <property name="hbm2ddl.auto">update</property>

         -->

         <mapping class="com.bjsxt.hibernate.Group"/>

        <mapping class="com.bjsxt.hibernate.User"/>

        <!--

        <mapping resource="com/bjsxt/hibernate/Group.hbm.xml"/>

         <mapping resource="com/bjsxt/hibernate/User.hbm.xml"/>

         -->

    </session-factory>

</hibernate-configuration>

HibernateORMappingTest.java

package com.bjsxt.hibernate;

import java.util.Date;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.AnnotationConfiguration;

import org.hibernate.tool.hbm2ddl.SchemaExport;

import org.junit.AfterClass;

import org.junit.BeforeClass;

import org.junit.Test;

public class HibernateORMappingTest {

    private static SessionFactory sessionFactory;

    //@BeforeClass

    public static void beforeClass() {

            sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();

    }

    //@AfterClass

    public static void afterClass() {

        sessionFactory.close();

    }

    @Test

    public void testSchemaExport() {

        new SchemaExport(new AnnotationConfiguration().configure()).create(false, true);

    }

    public static void main(String[] args) {

        beforeClass();

    }

}

2.xml方式

<?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.bjsxt.hibernate.Group" table="t_group">

        <id name="id">

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

        </id>

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

        <set name="users">

            <key column="groupId"></key>

            <one-to-many class="com.bjsxt.hibernate.User"/>

        </set>

    </class>

</hibernate-mapping>

User.hbm.xml

<?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.bjsxt.hibernate.User" table="t_user">

        <id name="id">

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

        </id>

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

        <many-to-one name="group" column="groupId"></many-to-one>

    </class>

</hibernate-mapping>

hibernate.cfg.XML

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>

        <property name="connection.username">root</property>

        <property name="connection.password">bjsxt</property>

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

       <!--

        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

        <property name="connection.url">jdbc:oracle:thin:@localhost::SXT</property>

        <property name="connection.username">scott</property>

        <property name="connection.password">tiger</property>

          <property name="dialect">org.hibernate.dialect.OracleDialect</property>

       -->

        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size"></property>

        <!-- Enable Hibernate's automatic session context management -->

        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->

        <property name="show_sql">true</property>

        <property name="format_sql">true</property>

        <!-- Drop and re-create the database schema on startup

        <property name="hbm2ddl.auto">update</property>

         -->

        <!--

         <mapping class="com.bjsxt.hibernate.Group"/>

        <mapping class="com.bjsxt.hibernate.User"/>

         -->

        <mapping resource="com/bjsxt/hibernate/Group.hbm.xml"/>

         <mapping resource="com/bjsxt/hibernate/User.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

TEST一致

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