hibernate与pojo中的setXXX()和getXXX()之间的关系

我们以Customer为例，Customer中有firstName何laseName这两个属性，而在数据库中并没有这两个属性对应的字段，仅有一个name字段。
Hibernate只是对应pojo中的set,get方法，至于你的pojo里面是否有这个name这个private属性无关紧要，只要有setName,getName方法即可。因为当hibernate执行save,update,saveorupdate时，是找对应字段名的get方法。当执行load,find,get方法时，是找对应字段名的set方法而已，跟你是否在pojo声明这个私有属性无任何关系，只要有与字段名对应的set,get方法即可。
下面是DEMO:
这个是Customer的POJO

public class Customer implements java.io.Serializable {

	// Fields

	private long oid;
	private String firstName;
	private String lastName;
	
	public long getOid() {
		return oid;
	}
	public void setOid(long oid) {
		this.oid = oid;
	}
	public String getFirstName() {
		return firstName;
	}
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	public String getLastName() {
		return lastName;
	}
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	//注意这个地方，是与数据库中的name字段是对应的.
	public void setName(String name) {
		StringTokenizer t = new StringTokenizer(name);
		setFirstName(t.nextToken());
		setLastName(t.nextToken());
	}
	public String getName() {
		return getFirstName() + " " + getLastName();
	}
	public String toString() {
		return "firstName:"+this.firstName+" lastName:"+this.lastName;
	}
	
}

这个是映射文件

<hibernate-mapping>
    <class name="cn.com.test.Customer" table="customer" catalog="hibernate">
        <id name="oid" type="long">
            <column name="oid" />
            <generator class="native"></generator>
        </id>
        <property name="name" type="string">
            <column name="name" length="25" />
        </property>
    </class>
</hibernate-mapping>

这个测试用例

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Session session = HibernateSessionFactory.getSession();
		Transaction tran = null;
		try {
			tran = session.beginTransaction();
			Customer customer = new Customer();
			customer.setFirstName("威廉");
			customer.setLastName("史密斯");
			session.save(customer);
			tran.commit();
		} catch (Exception e) {
			if (tran != null) {
				tran.rollback();
			}
			e.printStackTrace();
		} finally {
			session.close();
		}
		
		
		Session session2 = HibernateSessionFactory.getSession();
		Transaction tran2 = null;
		Customer customer = null;
		try {
			tran2 = session2.beginTransaction();
			customer = (Customer)session2.get(Customer.class, new Long(1));
			tran2.commit();
		} catch (Exception e) {
			if (tran2 != null) {
				tran2.rollback();
			}
			e.printStackTrace();
		} finally {
			session2.close();
		}
		if (customer != null) {
			System.out.println(customer.toString());
		}
	}

}

这个是sql文件

CREATE TABLE `customer` (
  `oid` bigint(20) NOT NULL auto_increment,
  `name` varchar(25) default NULL,
  PRIMARY KEY  (`oid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

Hibernate日志
Hibernate:
    insert
    into
        hibernate.customer
        (name)
    values
        (?)
Hibernate:
    select
        customer0_.oid as oid0_0_,
        customer0_.name as name0_0_
    from
        hibernate.customer customer0_
    where
        customer0_.oid=?
firstName:威廉 lastName:史密斯