hibernate详解（十四）组件映射

组件映射

• 组建映射是指在一个实体类中有一个属性为自定义的类，但是自定义的类中并没有oid，在数据库中也没有对应这个类的表。
  表结构：

/* 组件映射 */
CREATE TABLE t_customer(
    id NUMBER(10) PRIMARY KEY,
    name VARCHAR2(20),
    province VARCHAR2(20),
    city VARCHAR2(20),
    street VARCHAR2(20)
);

Customner类

package com.iotek.basic.component.pojo;

import java.io.Serializable;

public class Customer implements Serializable {

    private static final long serialVersionUID = 5660598920023039135L;
    private Long id;
    private String name;
    private Address address;
    
    public Customer() {}

    public Customer(Long id, String name, Address address) {
        super();
        this.id = id;
        this.name = name;
        this.address = address;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Customer [id=" + id + ", name=" + name + ", address=" + address + "]";
    }
    
    
}

组件类 Address.java

package com.iotek.basic.component.pojo;

import java.io.Serializable;

public class Address implements Serializable {

    private static final long serialVersionUID = 1921592338080264702L;
    private String province;
    private String city;
    private String street;
    private Customer customer;
    
    public Address() {}

    public Address(String province, String city, String street, Customer customer) {
        super();
        this.province = province;
        this.city = city;
        this.street = street;
        this.customer = customer;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getStreet() {
        return street;
    }

    public void setStreet(String street) {
        this.street = street;
    }

    public Customer getCustomer() {
        return customer;
    }

    public void setCustomer(Customer customer) {
        this.customer = customer;
    }

    @Override
    public String toString() {
        return "Address [province=" + province + ", city=" + city + ", street=" + street + ", customer=" + customer
                + "]";
    }
    
    
}

映射文件：

    
        
            
                t_customer_seq
            
        
        
        
        
        
            
            
            
            
        
    

hibernate.cfg.xml文件：

    
        
        
          
        oracle.jdbc.driver.OracleDriver
        
          
        jdbc:oracle:thin:@localhost:1521:XE
        
          
        guest
        
          
        guest
        
          
        true
        
          
        org.hibernate.dialect.Oracle10gDialect
        
        
        20
        
        
        2
        
        
        5000
        
        !

        100
        
        
        150
        
        
        2
        
        
        false
        
        
        
        
    

看代码就可以理解了。
总结：

1.png