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Hibernate学习---第五节：普通组件和动态组件
一、普通组件映射配置
1、创建组件类，代码如下：
package learn.hibernate.bean;/** * 组件类 */public class Phones { private String companyPhone; private String homePhone; private String personalPhone; public Phones() { } public Phones(String companyPhone, String homePhone, String personalPhone) { super(); this.companyPhone = companyPhone; this.homePhone = homePhone; this.personalPhone = personalPhone; } @Override public String toString() { return "Phones [companyPhone=" + companyPhone + ", homePhone=" + homePhone + ", personalPhone=" + personalPhone + "]"; } public String getCompanyPhone() { return companyPhone; } public void setCompanyPhone(String companyPhone) { this.companyPhone = companyPhone; } public String getHomePhone() { return homePhone; } public void setHomePhone(String homePhone) { this.homePhone = homePhone; } public String getPersonalPhone() { return personalPhone; } public void setPersonalPhone(String personalPhone) { this.personalPhone = personalPhone; }}
package learn.hibernate.bean;/** * 组件类 */public class Address { private String zipCode; private String address; public Address() { super(); } public Address(String zipCode, String address) { super(); this.zipCode = zipCode; this.address = address; } @Override public String toString() { return "Address [zipCode=" + zipCode + ", address=" + address + "]"; } public String getZipCode() { return zipCode; } public void setZipCode(String zipCode) { this.zipCode = zipCode; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; }}
2、将组件类作为属性放入到主类中，代码如下：
package learn.hibernate.bean;import java.util.Date;/** * 持久化类 */public class Person { private Integer id; private String name; private int age; private int passwork; private Date birthday; // 组件实例 private Address addres; // 组件实例 private Phones phone; public Person() { } public Person(String name, int age, int passwork, Date birthday) { super(); this.name = name; this.age = age; this.passwork = passwork; this.birthday = birthday; } @Override public String toString() { return "Person [id=" + id + ", name=" + name + ", age=" + age + ", passwork=" + passwork + ", birthday=" + birthday + "]"; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getPasswork() { return passwork; } public void setPasswork(int passwork) { this.passwork = passwork; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Address getAddres() { return addres; } public void setAddres(Address addres) { this.addres = addres; } public Phones getPhone() { return phone; } public void setPhone(Phones phone) { this.phone = phone; } }
3、配置文件，代码如下：
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="learn.hibernate.bean"> <class name="Person" table="t_person"> <id name="id" column="person_id"> <generator class="native"/> </id> <property name="name" column="t_name"/> <property name="age"/> <property name="passwork"/> <property name="birthday"/> <!-- 组件类的映射配置 component 指定需要映射的组件类 name 指定 Person 中组件属性的变量名称 name的值"addres" 与 Person 中定义的要一致 --> <component name="addres"> <property name="zipCode"/> <property name="address"/> </component> <component name="phone"> <property name="companyPhone"/> <property name="homePhone"/> <property name="personalPhone"/> </component> </class></hibernate-mapping>
4、测试代码：
@Testpublic void testComponent() { Person p = new Person("sdf",23,123456,new Date()); Address address = new Address("410000","湖南长沙"); Phones phone = new Phones("07318678987","0731876567","15114565678"); // person 与 address 关联 p.setAddres(address); // person 与 phone 关联 p.setPhone(phone); tx = session.beginTransaction(); session.persist(p); tx.commit(); }
二、动态组件映射配置
1、创建类，代码如下：
package learn.hibernate.bean;import java.util.Date;import java.util.HashMap;import java.util.Map;/** * 持久化类设计 * 注意： * 持久化类通常建议要有一个持久化标识符(ID) * 持久化标识符通常建议使用封装类(例如：Integer 因为基本类型存在默认值) * 持久化类通常建议手动添加一个无参构造函数 (因为有些操作是通过放射机制进行的) * 属性通常建议提供 getter/setter 方法 * 持久化类不能使用 final 修饰 * 持久化类中如果使用了集合类型数据，只能使用集合所对应的接口类型来声明(List/Map/Set) * 如下：ArrayList list = new ArrayList(); 不行 * List list = new ArrayList(); 可行 */public class Person { private Integer id; private String name; private int age; private int passwork; private Date birthday; // 动态组件实例 private Map attribute = new HashMap(); public Person() { } public Person(String name, int age, int passwork, Date birthday) { super(); this.name = name; this.age = age; this.passwork = passwork; this.birthday = birthday; } @Override public String toString() { return "Person [id=" + id + ", name=" + name + ", age=" + age + ", passwork=" + passwork + ", birthday=" + birthday + "]"; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getPasswork() { return passwork; } public void setPasswork(int passwork) { this.passwork = passwork; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Map getAttribute() { return attribute; } public void setAttribute(Map attribute) { this.attribute = attribute; } }
2、映射配置文件，代码如下：
<?xml version="1.0"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping package="learn.hibernate.bean"> <class name="Person" table="t_person"> <id name="id" column="person_id"> <generator class="native"/> </id> <property name="name" column="t_name"/> <property name="age"/> <property name="passwork"/> <property name="birthday"/> <!-- 动态组件类的映射配置 dynamic-component 指定需要映射的组件类 name="attribute" 对应持久化类中集合的变量名称 property Map 集合中key映射配置 name 对 Map 集合的key column 存储 key 所对应的值 type 字段的数据类型 --> <dynamic-component name="attribute"> <property name="key1" column="t_key1" type="string"/> <property name="key2" column="t_key1" type="integer"/> </dynamic-component> </class></hibernate-mapping>
3、测试代码：
@Testpublic void testComponent() { Person p = new Person("sdf",23,123456,new Date()); // 在 Person 中只有声明，也有创建 Map attribute = p.getAttribute(); attribute.put("key1", "hibernate"); attribute.put("key2", 123); tx = session.beginTransaction(); session.persist(p); tx.commit(); }
4、如果在 Person 类中只声明了动态组件，并未创建，如下：
package learn.hibernate.bean;import java.util.Date;import java.util.HashMap;import java.util.Map;/** * 持久化类设计 * 注意： * 持久化类通常建议要有一个持久化标识符(ID) * 持久化标识符通常建议使用封装类(例如：Integer 因为基本类型存在默认值) * 持久化类通常建议手动添加一个无参构造函数 (因为有些操作是通过放射机制进行的) * 属性通常建议提供 getter/setter 方法 * 持久化类不能使用 final 修饰 * 持久化类中如果使用了集合类型数据，只能使用集合所对应的接口类型来声明(List/Map/Set) * 如下：ArrayList list = new ArrayList(); 不行 * List list = new ArrayList(); 可行 */public class Person { private Integer id; private String name; private int age; private int passwork; private Date birthday; // 动态组件实例 private Map attribute; public Person() { } public Person(String name, int age, int passwork, Date birthday) { super(); this.name = name; this.age = age; this.passwork = passwork; this.birthday = birthday; } @Override public String toString() { return "Person [id=" + id + ", name=" + name + ", age=" + age + ", passwork=" + passwork + ", birthday=" + birthday + "]"; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getPasswork() { return passwork; } public void setPasswork(int passwork) { this.passwork = passwork; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Map getAttribute() { return attribute; } public void setAttribute(Map attribute) { this.attribute = attribute; } }
5、那么在测试代码需要创建一个，代码如下：
@Testpublic void testAttribute() { Person p = new Person("sdf",23,123456,new Date()); // 在 Person 中只有声明，没有创建 Map attribute = new HashMap(); attribute.put("key1", "hibernate"); attribute.put("key2", 123); p.setAttribute(attribute); tx = session.beginTransaction(); session.persist(p); tx.commit(); }
6、查询，测试代码：
@Testpublic void testGetAttribute() { Person p = (Person)session.get(Person.class, 1); System.out.println(p); // 高效操作 map 集合 Iterator<Map.Entry> it = p.getAttribute().entrySet().iterator(); for(;it.hasNext();){ Map.Entry map = it.next(); System.out.println(map.getKey()+"---------"+map.getValue()); }}
Hibernate学习---第五节：普通组件和动态组件
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