雪山飞鹄

SQL

create table Roles
(
   id                   int not null auto_increment,
   name                 varchar(20),
   primary key (id)
);

create table Users
(
   id                   int not null auto_increment,
   name                 varchar(20),
   primary key (id)
);

create table user_role
(
   user_id              int not null,
   role_id              int not null,
   primary key (user_id, role_id)
);

alter table user_role add constraint FK_Reference_1 foreign key (user_id)
      references Users (id) on delete restrict on update restrict;

alter table user_role add constraint FK_Reference_2 foreign key (role_id)
      references Roles (id) on delete restrict on update restrict;

Role.java

package com.many2many.bean;

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name="roles",catalog="JPA_Many2Many")
public class Role {

    private int id;
    private String name;
    private Set<User> users;
    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @ManyToMany(cascade=CascadeType.PERSIST)
    @JoinTable(
            name="user_role",
            joinColumns=@JoinColumn(name="role_id"),
            inverseJoinColumns=@JoinColumn(name="user_id")
    )
    public Set<User> getUsers() {
        return users;
    }
    public void setUsers(Set<User> users) {
        this.users = users;
    }

}

User.java

package com.many2many.bean;

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name="users",catalog="JPA_Many2Many")
public class User {

    private int id;
    private String name;
    private Set<Role> roles;
    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @ManyToMany(mappedBy="users",cascade=CascadeType.REFRESH)
    public Set<Role> getRoles() {
        return roles;
    }
    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }


}

JPAUtil.java

package com.many2many.util;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class JPAUtil {

    private static EntityManager entityManager;
    public static EntityManager getInstance(){
        if(entityManager!=null){
            return entityManager;
        }else{
            return makeInstance();
        }
    }
    private static synchronized EntityManager makeInstance() {
        if(entityManager==null){
            EntityManagerFactory entityManagerFactory=Persistence.createEntityManagerFactory("JPA_Many2ManyPU");
            return entityManagerFactory.createEntityManager();
        }
        return null;
    }
}

测试代码

@Test
    public void insert(){
        EntityManager entityManager=JPAUtil.getInstance();
        EntityTransaction entityTransaction=entityManager.getTransaction();
        try {
            entityTransaction.begin();

            User user=new User();
            user.setName("张三");

            Role role=new Role();
            role.setName("管理员");

            Set<User> users=new HashSet<User>();
            users.add(user);

            role.setUsers(users);

            entityManager.persist(role);

            entityTransaction.commit();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Test
    public void select(){
        EntityManager entityManager=JPAUtil.getInstance();
        Role role=entityManager.find(Role.class, 1);
        System.out.println(role.getName());
        Set<User> set=role.getUsers();
        for (Iterator<User> iterator = set.iterator(); iterator.hasNext();) {
            User user = (User) iterator.next();
            System.out.println(user.getName());
        }
    }

posted @ 2010-10-18 20:44 雪山飞鹄阅读(1968) | 评论 (0) | 编辑收藏

Hibernate多对一双向关联(Annotation配置)

Department.java

package com.many2one.bean;

import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name="department",catalog="Hibernate_Many2One")
public class Department {

    private int id;
    private String name;
    private Set<Employee> sets;
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id")
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @OneToMany(mappedBy="department")
    public Set<Employee> getSets() {
        return sets;
    }
    public void setSets(Set<Employee> sets) {
        this.sets = sets;
    }

}

Employee.java

package com.many2one.bean;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="employee",catalog="Hibernate_Many2One")
public class Employee {

    private int id;
    private String name;
    private Department department;
    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="deptid")
    public Department getDepartment() {
        return department;
    }
    public void setDepartment(Department department) {
        this.department = department;
    }


}

导出的sql

create table Hibernate_Many2One.department (
        id integer not null auto_increment,
        name varchar(255),
        primary key (id)
    )

    create table Hibernate_Many2One.employee (
        id integer not null auto_increment,
        name varchar(255),
        deptid integer,
        primary key (id)
    )

    alter table Hibernate_Many2One.employee
        add index FK4722E6AE3829E242 (deptid),
        add constraint FK4722E6AE3829E242
        foreign key (deptid)
        references Hibernate_Many2One.department (id)

测试代码

@Test
    public void insert(){
        Session session=HibernateSessionFactory.getSession();
        Transaction transaction=session.beginTransaction();
        try {
            transaction.begin();
            Department department=new Department();
            department.setName("软件测试部");
            Employee employee=new Employee();
            employee.setName("张三");
            employee.setDepartment(department);
            session.save(employee);
            transaction.commit();
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }


    @Test
    public void select(){
        Session session=HibernateSessionFactory.getSession();
        try {
            Employee employee=(Employee) session.get(Employee.class, 1);
            System.out.println(employee.getName());
            System.out.println(employee.getDepartment().getName());
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }

posted @ 2010-10-18 15:46 雪山飞鹄阅读(1455) | 评论 (1) | 编辑收藏

Hibernate多对一双向关联(xml配置)

Department.java

package com.many2one.bean;

import java.util.Set;

public class Department {

    private int id;
    private String name;
    private Set<Employee> sets;
    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<Employee> getSets() {
        return sets;
    }
    public void setSets(Set<Employee> sets) {
        this.sets = sets;
    }

}

Employee.java

package com.many2one.bean;

public class Employee {

    private int id;
    private String name;
    private Department department;
    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 Department getDepartment() {
        return department;
    }
    public void setDepartment(Department department) {
        this.department = department;
    }


}

映射文件
Department.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">
    <hibernate-mapping package="com.many2one.bean">
        <class name="Department" table="department" catalog="Hibernate_Many2One">
            <id name="id" column="id">
                <generator class="native"/>
            </id>
            <property name="name" column="name"/>

        </class>
    </hibernate-mapping>

Employee.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">
    <hibernate-mapping package="com.many2one.bean">
        <class name="Employee" table="employee" catalog="Hibernate_Many2One">
            <id name="id" column="id">
                <generator class="native"/>
            </id>
            <property name="name" column="name"/>
            <many-to-one name="department" column="deptid" cascade="all" />
        </class>
    </hibernate-mapping>

导出的sql

create table Hibernate_Many2One.department (
        id integer not null auto_increment,
        name varchar(255),
        primary key (id)
    )

    create table Hibernate_Many2One.employee (
        id integer not null auto_increment,
        name varchar(255),
        deptid integer,
        primary key (id)
    )

    alter table Hibernate_Many2One.employee
        add index FK4722E6AE3829E242 (deptid),
        add constraint FK4722E6AE3829E242
        foreign key (deptid)
        references Hibernate_Many2One.department (id)

测试代码

@Test
    public void insert(){
        Session session=HibernateSessionFactory.getSession();
        Transaction transaction=session.beginTransaction();
        try {
            transaction.begin();
            Department department=new Department();
            department.setName("软件测试部");
            Employee employee=new Employee();
            employee.setName("张三");
            employee.setDepartment(department);
            session.save(employee);
            transaction.commit();
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }


    @Test
    public void select(){
        Session session=HibernateSessionFactory.getSession();
        try {
            Employee employee=(Employee) session.get(Employee.class, 1);
            System.out.println(employee.getName());
            System.out.println(employee.getDepartment().getName());
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }

posted @ 2010-10-18 15:40 雪山飞鹄阅读(2336) | 评论 (0) | 编辑收藏

Hibernate一对一外键双向关联(Annotation配置篇)

Husband.java

package com.one2one.bean;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name="husband",catalog="Hibernate_One2One_fk")
public class Husband {

    private int id;
    private String name;
    private Wife wife;
    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @OneToOne(cascade=CascadeType.ALL,mappedBy="husband")
    public Wife getWife() {
        return wife;
    }
    public void setWife(Wife wife) {
        this.wife = wife;
    }

}

Wife.java

package com.one2one.bean;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity
@Table(name="wife",catalog="Hibernate_One2One_fk")
public class Wife {

    private int id;
    private String name;
    private Husband husband;
    @Id
    @Column(name="id")
    @GeneratedValue(strategy=GenerationType.AUTO)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @OneToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="husband_id")
    public Husband getHusband() {
        return husband;
    }
    public void setHusband(Husband husband) {
        this.husband = husband;
    }

}

导出的sql

create table Hibernate_One2One_fk.husband (
        id integer not null auto_increment,
        name varchar(255),
        primary key (id)
    )

    create table Hibernate_One2One_fk.wife (
        id integer not null auto_increment,
        name varchar(255),
        husband_id integer,
        primary key (id)
    )

    alter table Hibernate_One2One_fk.wife
        add index FK37AF119039AEDD (husband_id),
        add constraint FK37AF119039AEDD
        foreign key (husband_id)
        references Hibernate_One2One_fk.husband (id)

测试代码

@Test
    public void save(){
        Session session=HibernateSessionFactory.getSession();
        Transaction transaction=session.beginTransaction();
        try {
            transaction.begin();
            Husband husband=new Husband();
            husband.setName("张三");
            session.save(husband);
            Wife wife=new Wife();
            wife.setName("如花");
            wife.setHusband(husband);
            session.save(wife);
            transaction.commit();
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }

    @Test
    public void select(){
        Session session=HibernateSessionFactory.getSession();
        Husband husband=(Husband) session.get(Husband.class, 1);
        System.out.println(husband.getName());
        System.out.println(husband.getWife().getName());
    }

posted @ 2010-10-18 14:29 雪山飞鹄阅读(1442) | 评论 (0) | 编辑收藏

Hibernate一对一外键双向关联(xml配置篇)

Husband.java

package com.one2one.bean;

public class Husband {

    private int id;
    private String name;
    private Wife wife;
    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 Wife getWife() {
        return wife;
    }
    public void setWife(Wife wife) {
        this.wife = wife;
    }

}

Wife.java

package com.one2one.bean;

public class Wife {

    private int id;
    private String name;
    private Husband husband;
    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 Husband getHusband() {
        return husband;
    }
    public void setHusband(Husband husband) {
        this.husband = husband;
    }

}

映射文件
Husband.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">
    <hibernate-mapping package="com.one2one.bean">
        <class name="Husband" table="husband" catalog="Hibernate_One2One_fk">
            <id name="id" column="id">
                <generator class="native"/>
            </id>
            <property name="name" column="name"/>
            <one-to-one name="wife" class="Wife" property-ref="husband"/>
        </class>
    </hibernate-mapping>

<one-to-one name="wife" class="Wife" property-ref="husband"/> property-ref后的husband为Wife中定义的husband属性
Wife.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">
    <hibernate-mapping package="com.one2one.bean">
        <class name="Wife" table="wife" catalog="Hibernate_One2One_fk">
            <id name="id" column="id">
                <generator class="native"/>
            </id>
            <property name="name" column="name"/>
            <many-to-one name="husband" column="husband_id" unique="true" />
        </class>
    </hibernate-mapping>

<many-to-one name="husband" column="husband_id" unique="true" />
many-to-one的作用是在wife表中生成一个外键husband_id,且唯一,并参照husband表中的主键
用hibernate的hbm2ddl导出的sql

create table Hibernate_One2One_fk.husband (
        id integer not null auto_increment,
        name varchar(255),
        primary key (id)
    )

    create table Hibernate_One2One_fk.wife (
        id integer not null auto_increment,
        name varchar(255),
        husband_id integer unique,
        primary key (id)
    )

    alter table Hibernate_One2One_fk.wife
        add index FK37AF119039AEDD (husband_id),
        add constraint FK37AF119039AEDD
        foreign key (husband_id)
        references Hibernate_One2One_fk.husband (id)

测试示例

@Test
    public void save(){
        Session session=HibernateSessionFactory.getSession();
        Transaction transaction=session.beginTransaction();
        try {
            transaction.begin();
            Husband husband=new Husband();
            husband.setName("张三");
            session.save(husband);
            Wife wife=new Wife();
            wife.setName("如花");
            wife.setHusband(husband);
            session.save(wife);
            transaction.commit();
        } catch (HibernateException e) {
            e.printStackTrace();
        }
    }

    @Test
    public void select(){
        Session session=HibernateSessionFactory.getSession();
        Husband husband=(Husband) session.get(Husband.class, 1);
        System.out.println(husband.getName());
        System.out.println(husband.getWife().getName());
    }

posted @ 2010-10-18 14:17 雪山飞鹄阅读(6103) | 评论 (0) | 编辑收藏

JPA双向关联多对一映射

SQL

create table Department
(
   id                   int not null auto_increment,
   name                 varchar(20),
   primary key (id)
);

create table Employee
(
   id                   int not null auto_increment,
   name                 varchar(20),
   deptid               int,
   primary key (id)
);

alter table Employee add constraint FK_Reference_1 foreign key (deptid)
      references Department (id) on delete restrict on update restrict;

Department.java

package com.many2one.bean;

import java.io.Serializable;
import java.util.Set;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@SuppressWarnings("serial")
@Entity
@Table(name="department",catalog="jpa_many2one")
public class Department  implements Serializable{

    private int id;
    private String name;
    private Set<Employee> sets;
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id")
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @OneToMany(mappedBy="department")
    public Set<Employee> getSets() {
        return sets;
    }
    public void setSets(Set<Employee> sets) {
        this.sets = sets;
    }


}

Employee.java

package com.many2one.bean;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="employee",catalog="jpa_many2one")
public class Employee {

    private int id;
    private String name;
    private Department department;
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id")
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Column(name="name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="deptid")
    public Department getDepartment() {
        return department;
    }
    public void setDepartment(Department department) {
        this.department = department;
    }


}

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">

    <persistence-unit name="JPA_Many2OnePU" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>com.many2one.bean.Department</class>
        <class>com.many2one.bean.Employee</class>
          <properties>
            <property name = "hibernate.connection.driver_class" value = "com.mysql.jdbc.Driver"/>
            <property name = "hibernate.connection.url" value = "jdbc:mysql://localhost:3306/jpa_many2one"/>
            <property name = "hibernate.connection.username" value = "root"/>
            <property name = "hibernate.connection.password" value = "root"/>
            <property name = "hibernate.show_sql" value = "true"/>
            <property name = "hibernate.format_sql" value = "true"/>
          </properties>
    </persistence-unit>

</persistence>

JPAUtil.java

package com.many2one.util;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class JPAUtil {

    private static EntityManager entityManager;
    public static EntityManager getInstance(){
        if(entityManager!=null){
            return entityManager;
        }else{
            return makeInstance();
        }
    }
    private static synchronized EntityManager makeInstance() {
        if(entityManager==null){
            EntityManagerFactory entityManagerFactory=Persistence.createEntityManagerFactory("JPA_Many2OnePU");
            return entityManagerFactory.createEntityManager();
        }
        return null;
    }
}

@Test
    public void select(){
        EntityManager entityManager=JPAUtil.getInstance();
        Employee employee=entityManager.find(Employee.class, 1);
        System.out.println("雇员是:"+employee.getName());
        System.out.println("部门是:"+employee.getDepartment().getName());
    }

    @Test
    public void insert(){
        EntityManager entityManager=JPAUtil.getInstance();
        EntityTransaction entityTransaction=entityManager.getTransaction();
        try {
            entityTransaction.begin();
            Department department=new Department();
            department.setName("软件研发部");
            Employee employee=new Employee();
            employee.setName("张三");
            employee.setDepartment(department);
            entityManager.persist(employee);
            entityTransaction.commit();
        } catch (Exception e) {
            e.printStackTrace();
            entityTransaction.rollback();
        }
    }

posted @ 2010-10-17 16:36 雪山飞鹄阅读(2610) | 评论 (0) | 编辑收藏

一个tomcat配置多个端口[转]

此文转自http://linder.javaeye.com/blog/782071
一、Tomcat 安装后本身提供了一个server，端口配置默认是8080，对应目录为：..\Tomcat 6.0\webapps
二、Tomcat 6.0 配置多个端口，其实也就是给Tomcat增加几个server，并设置对应目录。下面以增加两个端口号为例
第一步、修改server.xml[..\Tomcat 6.0\conf]
（1）Tomcat提供的如下：

（2）比着上面的葫芦画下面的瓢、新增两个端口号，注意Service name、Engine name、appBase，当然了，端口号别忘了修改，以免重复。

<Service name="Catalina2">

    <Connector port="8092" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true" />

    <Connector port="8009"
               enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />

    <Engine name="Catalina2" defaultHost="localhost">

      <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
             resourceName="UserDatabase"/>

      <Host name="localhost" appBase="webapps2"
       unpackWARs="true" autoDeploy="true"
       xmlValidation="false" xmlNamespaceAware="false">
      </Host>

    </Engine>

</Service>

第二步、创建相应的部署目录
..\Tomcat 6.0\webapps1
..\Tomcat 6.0\webapps2
同时可以将Tomcat 6.0\webapps下的有用的复制到新建的部署目录

第三步、创建配置文件目录和配置文件
..\Tomcat 6.0\conf\Catalina1\localhost
..\Tomcat 6.0\conf\Catalina2\localhost

host-manager.xml
manager.xml

配置文件的配置可参照..\Tomcat 6.0\conf\Catalina\localhost下的，只需要修改一下对应目录即可

大概的配置步骤就是这些，现在可以把不同的war包放在不同的位置来访问了
以上配置方法同样适合Tomcat 5.5

posted @ 2010-10-16 19:23 雪山飞鹄阅读(1674) | 评论 (0) | 编辑收藏

Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist:

Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist:
此异常多出现在Hibernate、JPA级联映射中,在级联保存时频发
从异常信息不难看出，在进行持久化的时候引用了一个未持久化的对象
或者确定给对象已被持久化了,当再次去引用时，仍包此错误，那么只有一种可能，就是在配置文件里面级联配置的不正确尝试把cascade = CascadeType.ALL 改成 cascade=CascadeType.REFRESH 测一下看看。(适用于Hibernate注解或JPA的级联映射)

posted @ 2010-10-15 13:30 雪山飞鹄阅读(3938) | 评论 (0) | 编辑收藏

java.lang.IllegalStateException: Not allowed to create transaction on shared EntityManager - use Spring transactions or EJB CMT instead

java.lang.IllegalStateException: Not allowed to create transaction on shared EntityManager - use Spring transactions or EJB CMT instead
环境说明:
该异常出自JPA的事务
产生此异常的原因是因为在项目中将JPA的事务交给spring来管理,即使用了@Transactional注解,而自己手动又在代码中开启了JPA的事务.
解决方案:删除自己手动写的JPA事务代码或去掉@Transactional注解

posted @ 2010-10-15 11:02 雪山飞鹄阅读(5482) | 评论 (0) | 编辑收藏

JPA外键双向关联一对一映射

create table Husband
(
   id                   int not null auto_increment,
   name                 varchar(20),
   primary key (id)
);

create table Wife
(
   id                   int not null auto_increment,
   name                 varchar(20),
   husband_id           int,
   primary key (id)
);
alter table Wife add constraint FK_Reference_1 foreign key (id)
      references Husband (id) on delete restrict on update restrict;

Husband

package com.ono2one.bean;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@SuppressWarnings("serial")
@Entity
@Table(name="husband",catalog="JPA_One2One_fk")
public class Husband implements Serializable{

    private int id;
    private String name;
    private Wife wife;
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    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;
    }
    @OneToOne(mappedBy="husband")
    public Wife getWife() {
        return wife;
    }
    public void setWife(Wife wife) {
        this.wife = wife;
    }

}

Wife

package com.ono2one.bean;

import java.io.Serializable;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@SuppressWarnings("serial")
@Entity
@Table(name="wife",catalog="JPA_One2One_fk")
public class Wife implements Serializable{

    private int id;
    private String name;
    private Husband husband;
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    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;
    }
    @OneToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="husband_id")
    public Husband getHusband() {
        return husband;
    }
    public void setHusband(Husband husband) {
        this.husband = husband;
    }

}

JPAUtil

package com.ono2one.util;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public class JPAUtil {

    private static EntityManager entityManager;
    public static EntityManager getInstance(){
        if(entityManager!=null){
            return entityManager;
        }else{
            return makeInstance();
        }
    }
    private static synchronized EntityManager makeInstance() {
        if(entityManager==null){
            EntityManagerFactory entityManagerFactory=Persistence.createEntityManagerFactory("JPA_One2One_fkPU");
            return entityManagerFactory.createEntityManager();
        }
        return null;
    }
}

persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0">

    <persistence-unit name="JPA_One2One_fkPU" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>com.ono2one.bean.Husband</class>
        <class>com.ono2one.bean.Wife</class>
          <properties>
            <property name = "hibernate.connection.driver_class" value = "com.mysql.jdbc.Driver"/>
            <property name = "hibernate.connection.url" value = "jdbc:mysql://localhost:3306/JPA_One2One_pk"/>
            <property name = "hibernate.connection.username" value = "root"/>
            <property name = "hibernate.connection.password" value = "root"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>
          </properties>
    </persistence-unit>

</persistence>

HusbandDAO

package com.ono2one.dao;

import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;

import org.junit.Test;

import com.ono2one.bean.Husband;
import com.ono2one.bean.Wife;
import com.ono2one.util.JPAUtil;

public class HusbandDAO {

    @Test
    public void insert(){
        EntityManager entityManager=JPAUtil.getInstance();
        EntityTransaction entityTransaction=entityManager.getTransaction();
        try {
            entityTransaction.begin();
            Husband husband=new Husband();
            husband.setName("张三");
            entityManager.persist(husband);
            Wife wife=new Wife();
            wife.setName("如花");
            wife.setHusband(husband);
            entityManager.persist(wife);
            entityTransaction.commit();
        } catch (Exception e) {
            e.printStackTrace();
            entityTransaction.rollback();
        }
    }
}

posted @ 2010-10-14 20:37 雪山飞鹄阅读(3361) | 评论 (0) | 编辑收藏

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