02.Hibernate映射基础

<?xml version=‘1.0‘ encoding=‘utf-8‘?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="model" default-lazy="true" default-access="property" default-cascade="none">
	<class name="Teacher" table="tb_teacher" dynamic-insert="true" dynamic-update="true" lazy="true">
		<id name="id" column="id" type="long">
			<generator class="native"></generator>
		</id>
		<property name="no" 		column="no" 		type="string" 	not-null="true"/>
		<property name="name" 		column="name" 		type="string" 	access="field"/>
		<property name="sex" 		column="sex" 		type="string" 	update="true"/>
		<property name="job_title" 	column="job_title" 	type="string" 	insert="true"/>
	</class>
</hibernate-mapping>

1. 映射配置文件配置文件的作用是：用来确定持久化类与数据库表的关系。
   
2. 命名规则与存放位置：映射文件的命名可以任意只是文件后缀是.xml，也可以多个持久化类使用同一个映射文件。但是为了便于维护和项目的可读性，一般为每个持久化类些单独的映射文件，并使用XXX.hbm.xml的形式来命名，“XXX”既是持久化类名，并且持久化类与其映射文件放在同一目录下。
   

<hibernate-mapping schema="dbo"
    catalog="shopping"
    default-cascade="none|all|save-update|delete"
    default-access="property|field|ClassName"
    default-lazy="true|false"
    auto-import="true|false"
    package="package.name">

<class name="EntityClassName" 
	table="TableName"
	dynamic-insert="false|true"
	dynamic-update="false|true"
	lazy="false|true"
	optimistic-lock="version"
	mutable="false|true"
	select-before-update="false|true"
	batch-size="5"
	subselect="SQL expression"
	where="arbitrary sql where condition"
	check="arbitrary sql check condition"
	persister="PersisterClass"
	schema="schema"
	catalog="catalog"
	entity-name="EntityName"
	proxy="ProxyInterface"
	polymorphism="implicit"
	abstract="false|true"
	discriminator-value="discriminator-value"
	rowid="rowid"
	node="element-name">

<id name="PropertyName" 
	column="TableColumn"
	type="TypeName"
	length="ColumnLength"
	access="field|property|ClassName"
	unsaved-value="null|any|none|undefined|id_value"
	node="element-name">
	<generator class="native"></generator>
</id>

<generator class="native"></generator>

<property name="PropertyName"
	column="TableColumn"
	type="ColumnType"
	length="ColumnLength"
	unique-key="unique-key"
	unique="true|false"
	not-null="true|false"
	insert="true|false"
	update="true|false"
	lazy="true|false"
	access="field|property|ClassName"
	formula="arbitrary SQL expression"
	generated="never|insert|always"
	index="index_name"
	optimistic-lock="true"
	precision="10"
	scale="6"
	node="element-name">

<hibernate-configuration>
	<session-factory>
		<!-- 设置实体类到数据库的映射文件 -->
		<mapping resource="org/hbm/Teacher.txt"/>
	</session-factory>
</hibernate-configuration>

package model;
public class People
{
	private String firstName;
	private String lastName;
	private String sex;
	
	/** 数据处理 */
	public String getName()
	{
		return firstName + " " + lastName;
	}
	/** 数据验证 */
	public void setSex(String sex)
	{
		if("男".equals(sex) || "女".equals(sex))
		{
			this.sex = sex;
		}
	}
	
	//其他省略...
}

select name,sex ...,( select avg(age) from tb_people ) as avgAge from tb_people where id=1

<property name="homeAddress" column="‘Home Address‘" type="string"/>

<class name="People"><!-- 默认 table="People" -->
	<id name="id"><!-- 默认 column="id" -->
		<generator class="native"></generator>
	</id>
	<property name="name"/><!-- 默认 column="name" -->
	<property name="sex"/><!-- 默认 column="sex" -->
</class>

<id name="id">
    <meta attribute="scope-set">private</meta>
    <generator class="increment"></generator>
</id>
<id name="id">
    <meta attribute="scope-set">private</meta>
    <generator class="identity"></generator>
</id>
<id name="id">
    <meta attribute="scope-set">private</meta>
    <generator class="sequence">
        <param name="sequence">sequence_name</param>
    </generator>
</id>
<id name="id">
    <meta attribute="scope-set">private</meta>
    <generator class="hilo">
        <param name="table">hi_value</param>
        <param name="cloumn">next_value</param>
        <param name="max_lo">100</param>
    </generator>
</id>
<id name="id">
    <meta attribute="scope-set">private</meta>
    <generator class="native"></generator>
</id>

<composite-id>
	<key-property name="name" column="name"/>
	<key-property name="address" column="address"/>
</composite-id>