基于Hibernate3.2 Hibernate tools 的使用

由于新发布的Hibernate Tools是一个比较庞大的工具包 而且已经是作为Eclipse3.2 的插件发布的

然而以前的很有用的工具hbm2java和hbm2ddl都是非常有用的工具

所以我们应该把这些有用的工具找出来继续使用

环境

jdk-1_5_0_07

ant 1.6.5

Hibernate 3.2 cr2

Hibernate Tools-3.2.0.beta6

mysql-5.0.22

首先下载Hibernate Tools的包

在HIbernate的主页上有连接 下载是在sourceforge.net

地址：http://prdownloads.sourceforge.net/jboss/HibernateTools-3.2.0.beta6a.zip?download

下载完了以后解压缩HibernateTools-3.2.0.beta6a/plugins/org.hibernate.eclipse_3.2.0.beta6a/lib/tools

里找到hibernate-tools.jar 放到你的工程的lib里

目录结构

.
+src
+yourpackage
*.java
*.hbm.xml
...
hibernate.config.xml
...
+lib
......
+data

build.xml

把hibernate的目录里的lib里的jar还有hibernate3.jar copy到lib里别忘了hibernate-tools.jar

注意hibernate3.jar要用HibernateTools-3.2.0.beta6a/plugins/org.hibernate.eclipse_3.2.0.beta6a/lib/hibernate里的hibernate3.jar

还有mysql-connector-java-5.0.0-beta-bin.jar 这个连接驱动也少不了

另外还要把HibernateTools-3.2.0.beta6a/plugins/org.hibernate.eclipse_3.2.0.beta6a/lib/tools的freemarker.jar也copy到lib里

尽管HIbernate的自动产生代码的方式有很多

比如

1 写java 代码用Xdoclet来产生hbm.xml

2 写hbm.xml来产生java代码

3 写hbm.xml来产生ddl

4 从数据库来产生hbm.xml和ddl

这里先讲解hbm2java 和 hbm2ddl

1 --hbm2java

把写好的代码*.hbm.xml放在你的src的包里

比如这样的Customer.hbm.xml

<? xmlversion="1.0" ?>
<! DOCTYPEhibernate-mappingPUBLIC"-//Hibernate/HibernateMappingDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

< hibernate-mapping >

< class name ="ergal.Customer" table ="CUSTOMERS" lazy ="false" >
< id name ="id" type ="long" column ="ID" >
< generator class ="increment" />
</ id >

< property name ="name" type ="string" >
< column name ="NAME" length ="15" />
</ property >
< set
name ="orders"
cascade ="save-update"
inverse ="true"
>

< key column ="CUSTOMER_ID" />
< one-to-many class ="ergal.Order" />
</ set >
</ class >
</ hibernate-mapping >

还有Order.xml

<? xmlversion="1.0" ?>
<! DOCTYPEhibernate-mappingPUBLIC"-//Hibernate/HibernateMappingDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

< hibernate-mapping >

< class name ="ergal.Order" table ="ORDERS" >
< id name ="id" type ="long" column ="ID" >
< generator class ="increment" />
</ id >

< property name ="orderNumber" type ="string" >
< column name ="ORDERNUMBER" length ="15" />
</ property >

< many-to-one
name ="customer"
column ="CUSTOMER_ID"
class ="ergal.Customer"
not-null ="true"
cascade ="save-update"
/>
</ class >
</ hibernate-mapping >

再然后写Hibernate的配置文件

hibernate.config.xml

<? xmlversion='1.0'encoding='utf-8' ?>
<! DOCTYPEhibernate-configurationPUBLIC
"-//Hibernate/HibernateConfigurationDTD3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >

< hibernate-configuration >

< session-factory >

<!-- Databaseconnectionsettings -->
< property name ="connection.driver_class" > com.mysql.jdbc.Driver </ property >
< property name ="connection.url" > jdbc:mysql://localhost:3306/ahtest </ property >
< property name ="connection.username" > root </ property >
< property name ="connection.password" > ******** </ property >



<!-- JDBCconnectionpool(usethebuilt-in) -->
< property name ="hibernate.connection.provider_class" > org.hibernate.connection.C3P0ConnectionProvider </ property >
< property name ="hibernate.c3p0.max_size" > 20 </ property >

< property name ="hibernate.c3p0.min_size" > 5 </ property >

< property name ="hibernate.c3p0.timeout" > 120 </ property >

< property name ="hibernate.c3p0.max_statements" > 100 </ property >

< property name ="hibernate.c3p0.idle_test_period" > 120 </ property >

< property name ="hibernate.c3p0.acquire_increment" > 2 </ property >


<!-- SQLdialect -->
< property name ="dialect" > org.hibernate.dialect.MySQLDialect </ property >

<!-- EnableHibernate'sautomaticsessioncontextmanagement -->
< property name ="current_session_context_class" > thread </ property >

<!-- Disablethesecond-levelcache -->
< property name ="cache.provider_class" > org.hibernate.cache.NoCacheProvider </ property >

<!-- EchoallexecutedSQLtostdout -->
< property name ="show_sql" > true </ property >

<!-- Dropandre-createthedatabaseschemaonstartup -->
< property name ="hbm2ddl.auto" > create </ property >

< mapping resource ="ergal/Customer.hbm.xml" />
< mapping resource ="ergal/Order.hbm.xml" />

</ session-factory >

</ hibernate-configuration >

最后写build.xml

<? xmlversion="1.0"encoding="GBK" ?>

< project name ="hibernate-tutorial" default ="compile" >

< property name ="sourcedir" value ="${basedir}/src" />
< property name ="targetdir" value ="${basedir}/bin" />
< property name ="librarydir" value ="${basedir}/lib" />
< property name ="schema.dir" value ="${basedir}/data" />

< path id ="libraries" >
< fileset dir ="${librarydir}" >
< include name ="*.jar" />
</ fileset >
</ path >
< path id ="project.class.path" >
<!-- Includeourownclasses,ofcourse -->
< pathelement location ="${targetdir}" />
<!-- Includejarsintheprojectlibrarydirectory -->
< fileset dir ="${librarydir}" >
< include name ="*.jar" />
</ fileset >
</ path >

< target name ="clean">
< delete dir ="${targetdir}" />
< mkdir dir ="${targetdir}" />
</ target >

< target name ="copy-resources" >
< copy todir ="${targetdir}" >
< fileset dir ="${sourcedir}" >
< exclude name ="**/*.java" />
</ fileset >
</ copy >
</ target >

< target name ="compile" depends ="clean,copy-resources" >
< javac srcdir ="${sourcedir}"
destdir ="${targetdir}"
classpathref ="libraries" />
</ target >

< target name ="run" depends ="compile" >
< java fork ="true" classname ="ergal.BusinessService" classpathref ="libraries" >
< classpath path ="${targetdir}" />
< arg value ="${action}" />
</ java >
</ target >
<!-- create.javaform*.hbm.xml -->
< target name ="hbm2java" depends ="compile"
description ="GenerateJavasourcefromtheO/Rmappingfiles" >
< taskdef name ="hbm2java"
classname ="org.hibernate.tool.ant.HibernateToolTask"
classpathref ="project.class.path" />
< hbm2java destdir ="${targetdir}" >
< configuration configurationfile ="${targetdir}/hibernate.cfg.xml" />
< hbm2java jdk5 ="true" />
<!-- <cfg2hbm/> -->
</ hbm2java >

</ target >

<!-- createddlform*.hbm.xml -->
< target name ="hbm2ddl" depends ="compile"
description ="GenerateDBschemafromtheO/Rmappingfiles" >
< taskdef name ="hbm2ddl"
classname ="org.hibernate.tool.ant.HibernateToolTask"
classpathref ="project.class.path" />
< hbm2ddl destdir ="${schema.dir}" >
< configuration configurationfile ="${targetdir}/hibernate.cfg.xml" />
< hbm2ddl export ="true" console ="false" create ="true" update ="false" drop ="false" outputfilename ="ahtest.sql" />
</ hbm2ddl >
</ target >

</ project >

其中的 targetname="hbm2java" 就是这次用来产生代码的任务

然后用cmd进入你的build.xml的根目录

运行ant hbm2java

会在你的根目录下多了一个bin文件夹里面就自动产生了一个project的源文件

包含以下代码

Customer.java

package ergal;
// Generated2006-8-152:26:03byHibernateTools3.2.0.beta6a


import java.util.HashSet;
import java.util.Set;

/**
*Customergeneratedbyhbm2java
*/
public class Customer implements java.io.Serializable{

// Fields

private long id;
private Stringname;
private Set < Order > orders = new HashSet < Order > ( 0 );

// Constructors

/** defaultconstructor */
public Customer(){
}

/** fullconstructor */
public Customer(Stringname,Set < Order > orders){
this .name = name;
this .orders = orders;
}


// Propertyaccessors
public long getId(){
return this .id;
}

public void setId( long id){
this .id = id;
}
public StringgetName(){
return this .name;
}

public void setName(Stringname){
this .name = name;
}
public Set < Order > getOrders(){
return this .orders;
}

public void setOrders(Set < Order > orders){
this .orders = orders;
}




}

Order.java

package ergal;
// Generated2006-8-152:26:03byHibernateTools3.2.0.beta6a



/**
*Ordergeneratedbyhbm2java
*/
public class Order implements java.io.Serializable{

// Fields

private long id;
private StringorderNumber;
private Customercustomer;

// Constructors

/** defaultconstructor */
public Order(){
}

/** minimalconstructor */
public Order(Customercustomer){
this .customer = customer;
}
/** fullconstructor */
public Order(StringorderNumber,Customercustomer){
this .orderNumber = orderNumber;
this .customer = customer;
}


// Propertyaccessors
public long getId(){
return this .id;
}

public void setId( long id){
this .id = id;
}
public StringgetOrderNumber(){
return this .orderNumber;
}

public void setOrderNumber(StringorderNumber){
this .orderNumber = orderNumber;
}
public CustomergetCustomer(){
return this .customer;
}

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




}

2 hbm2ddl

现在用映射文件来产生ddl和数据表

现在数据库里create database ahtest;

然后在根目录下运行

ant hbm2ddl（因为前面的build.xml里已经定义了hbm2ddl --“targetname="hbm2ddl"”）

就会在数据库的ahtest里自动建好了customers和orders两个表

还会在data文件夹下产生

ahtest.sql这个ddl文件

createtableCUSTOMERS(
IDbigintnotnull,
NAMEvarchar(15),
primarykey(ID));
createtableORDERS(
IDbigintnotnull,
ORDERNUMBERvarchar(15),
CUSTOMER_IDbigintnotnull,
primarykey(ID));
altertableORDERS
addindexFK8B7256E5479EC1E3(CUSTOMER_ID),
addconstraintFK8B7256E5479EC1E3foreignkey(CUSTOMER_ID)referencesCUSTOMERS(ID);

这就是hbm2java和hbm2ddl这两个方便的工具的基本用法