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  • Hibernate学习笔记3.2(Hibernate组建映射)

    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:1521: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">1</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:1521: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">1</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:1521: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">1</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:1521: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">1</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:1521: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">1</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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  • 原文地址:https://www.cnblogs.com/frankzone/p/9448951.html
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