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hbm2java是根据映射文件自动生成java源文件
hbm2ddl 是根据映射文件自动生成数据库schema
XDoclet 根据带有XDoclet的标记的java源文件生成映射文件
Middlegen 根据数据库Schema自动生成映射文件
1'<class name = "mypack.customer">
<meta attribute = "class-description">//指定下列为注释
Repesents a single customer
@author S
</meta>
</class>
2'<class name = "mypack.customer">
<meta attribute = "extends">mypack.BusinessObject</meta>//指定类所继承的类
</class>
3'<property name = "married" type ="boolean" column ="is_married">
<meta attribute = "field-description">is the customer married </meta>//指定方法注释
</property>
4'指定类、类的属性及类属性的get方法和set方法的修饰符可选：
static 、 public 、 abstract 、final 、 private
<id name = "id" type = "int">
<meta attribute = "scope-set">protected</meta>
<generator class = "native">
</id>
5'指定在类的toString()方法返回的字符串中是否包含特定的属性
<property name ="name" type ="string" not-null = "true">
<meta attribute ="use-in-tostring">true</meta>
</property>
////////////////<meta>的元素属性表
class-description//指定描述类的javaDoc
field-description//指定描述类的属性的javaDoc
interface//如果为true，表示生成接口而非类，默认为false
implements//指定类所实现的接口
extends//指定类继承的父类名
generated-class//重新指定生成的类名
scope-class//指定类的修饰符默认为public
scope-set//指定set方法的修饰符默认为public
scope-get//指定get方法的修饰符默认为public
scope-field//指定类的属性修饰符默认为private
use-in-toString//如果为true，表示在tostring方法中包含此属性
gen-property//如果为false不会在java类中生成此属性，默认为true
finder-method//指定find方法名
///////////////<column>制定数据库表
1'设定字段名、字段长度以及唯一性
<property name = "name" type ="string">
<meta attribute ="use-in-tostring">true</meta>
<column name ="name" length ="15" not-null ="true" unique ="true">
</property>//表示字段名为name长度为15不能为空具有唯一性
2'设定字段不为空，并且为这个字段设立检查约束。
<property name = "age" type ="int">
<meta attribute = "field-description">How old is the customer</meta>
<meta attribute = "use-in-tostring">true</meta>
<column name = "age" check ="age > 10" not-null ="true">
</property>
3'建立索引
<property name = "registeredtime" type ="timestamp">
<meta attribute ="field-description">When the customer was registered</meta>
<meta attribute ="use-in-tostring">true</meta>
<column name ="registerd_time" index = "idx_registerd_time" sql-type= "timestamp">
</property>
4'建立对应的字段类型
<property name = "description" type ="string">
<meta attribute ="use-in-tostring">true</meta>
<column name = "description" sql-type ="text">//根据相对应的数据库来定义字段的类型
</property>
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