Hibernate集合映射之Map-----element映射基本类型值
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所谓基本类型,就是指java.lang.String,java.lang.Integer等基本类 以及用户编写的非实体类,虽然map中的数据是我们的数据库中的一个表,但我们不必为他创建POJO类及HBM文件
数据库结构:
create table teamMap (id varchar(32),teamname varchar(32));
create table studentMap (name varchar(32),description varchar(32), team_id varchar(32));
create table studentMap (name varchar(32),description varchar(32), team_id varchar(32));
实体类:(只有Team),其中的student无实体类,用表studentMap的name字段作为key,description作为value
package Collection.Map.Simple;
import java.util.HashMap;
import java.util.Map;
public class Team ...{
private String id;
private String teamname;
private Map students=new HashMap();
public String getId() ...{
return id;
}
public void setId(String id) ...{
this.id = id;
}
public String getTeamname() ...{
return teamname;
}
public void setTeamname(String teamname) ...{
this.teamname = teamname;
}
public Map getStudents() ...{
return students;
}
public void setStudents(Map students) ...{
this.students = students;
}
}
import java.util.HashMap;
import java.util.Map;
public class Team ...{
private String id;
private String teamname;
private Map students=new HashMap();
public String getId() ...{
return id;
}
public void setId(String id) ...{
this.id = id;
}
public String getTeamname() ...{
return teamname;
}
public void setTeamname(String teamname) ...{
this.teamname = teamname;
}
public Map getStudents() ...{
return students;
}
public void setStudents(Map students) ...{
this.students = students;
}
}
Team.hbm.xml
<?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">
<!--
Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
<class name="Collection.Map.Simple.Team" table="teamMap" >
<id name="id" unsaved-value="null">
<generator class="uuid.hex"></generator>
</id>
<property name="teamname" type="string" column="teamname"></property>
<map name="students" table="studentMap">
<key column="team_id"></key>
<!-- index代表key,element代表value,一个map标签只能有一个element -->
<index column="name" type="string"></index>
<element type="string" column="description"></element>
</map>
</class>
</hibernate-mapping>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
<class name="Collection.Map.Simple.Team" table="teamMap" >
<id name="id" unsaved-value="null">
<generator class="uuid.hex"></generator>
</id>
<property name="teamname" type="string" column="teamname"></property>
<map name="students" table="studentMap">
<key column="team_id"></key>
<!-- index代表key,element代表value,一个map标签只能有一个element -->
<index column="name" type="string"></index>
<element type="string" column="description"></element>
</map>
</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">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312&useUnicode=true
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="myeclipse.connection.profile">mysql</property>
<property name="connection.password">1234</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.show_sql">true</property>
<property name="current_session_context_class">thread</property>
<property name="jdbc.batch_size">15</property>
<mapping resource="Collection/Map/Simple/Team.hbm.xml" />
</session-factory>
</hibernate-configuration>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
<property name="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost:3306/schoolproject?characterEncoding=gb2312&useUnicode=true
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="myeclipse.connection.profile">mysql</property>
<property name="connection.password">1234</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="hibernate.show_sql">true</property>
<property name="current_session_context_class">thread</property>
<property name="jdbc.batch_size">15</property>
<mapping resource="Collection/Map/Simple/Team.hbm.xml" />
</session-factory>
</hibernate-configuration>
测试代码:
package Collection.Map.Simple;
import java.io.File;
import java.util.Map;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class Test ...{
public static void main(String[] args) ...{
String filePath=System.getProperty("user.dir")+File.separator+"src/Collection/Map/Simple"+File.separator+"hibernate.cfg.xml";
File file=new File(filePath);
System.out.println(filePath);
SessionFactory sessionFactory=new Configuration().configure(file).buildSessionFactory();
Session session=sessionFactory.openSession();
Transaction t=session.beginTransaction();
Team team=new Team();
team.setTeamname("team1");
Map stuMap=team.getStudents();
stuMap.put("stu1", "stu1 description");
stuMap.put("stu2", "stu2 description");
session.save(team);
t.commit();
}
}
import java.io.File;
import java.util.Map;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
public class Test ...{
public static void main(String[] args) ...{
String filePath=System.getProperty("user.dir")+File.separator+"src/Collection/Map/Simple"+File.separator+"hibernate.cfg.xml";
File file=new File(filePath);
System.out.println(filePath);
SessionFactory sessionFactory=new Configuration().configure(file).buildSessionFactory();
Session session=sessionFactory.openSession();
Transaction t=session.beginTransaction();
Team team=new Team();
team.setTeamname("team1");
Map stuMap=team.getStudents();
stuMap.put("stu1", "stu1 description");
stuMap.put("stu2", "stu2 description");
session.save(team);
t.commit();
}
}
运行结果:
Hibernate: insert into teamMap (teamname, id) values (?, ?)
Hibernate: insert into studentMap (team_id, name, description) values (?, ?, ?)
Hibernate: insert into studentMap (team_id, name, description) values (?, ?, ?)
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