hbm2java和hbm2ddl工具

Posted 2020-09-15

hbm2java工具根据映射文件自动生成Java源文件，而hbm2ddl工具则根据映射文件自动生成数据库Schema，下面是这两种工具的使用：

1.建立Java工程，加入Jar包，创建创建hibernate配置文件以及响应的映射文件，相关jar包及工程目录如下：

2.相关文件代码如下：

build.xml:

 1 <?xml version="1.0"?>
 2 <project name="Learning Hibernate" default="prepare" basedir="">
 3 <property name="source.root" value="src">
 4 </property>
 5 <property name="class.root" value="classes">
 6 </property>
 7 <property name="lib.dir" value="lib">
 8 </property>
 9 <property name="schema" value="schema">
10 </property>
11 <path id="project.class.path">
12 <!-- Include our own classes,of course -->
13 <pathelement location="${class.root}" />
14 <!-- Include jars in the project library directory -->
15 <fileset dir="${lib.dir}">
16 <include name="*.jar" />
17 </fileset>
18 </path>
19 <target name="prepare" description="Sets up build structures">
20 <delete dir="${class.root}">
21 </delete>
22 <mkdir dir="${class.root}" />
23 <copy todir="${class.root}">
24 <fileset dir="${source.root}">
25 <include name="**/*.properties" />
26 <include name="**/*.hbm.xml" />
27 <include name="**/*.cfg.xml" />
28 </fileset>
29 </copy>
30 </target>
31 <!-- hbm2java任务-->
32 <target name="codegen" depends="prepare">
33 <taskdef name="hbm2javaTask" classname="org.hibernate.tool.ant.HibernateToolTask" classpathref="project.class.path" />
34 <hbm2javaTask destdir="${source.root}">
35 <configuration configurationfile="${class.root}/hibernate.cfg.xml" />
36 <hbm2java />
37 </hbm2javaTask>
38 </target>
39 <!--编译Java源文件 -->
40 <target name="compile" depends="codegen" description="Compiles all java classes">
41 <javac srcdir="${source.root}" destdir="${class.root}" debug="on" optimize="off" deprecation="on" includeAntRuntime="false">
42 <classpath refid="project.class.path">
43 </classpath>
44 </javac>
45 </target>
46 <!--hbm2ddl任务-->
47 <target name="schema" depends="compile">
48 <taskdef name="hbm2ddlTask" classname="org.hibernate.tool.ant.HibernateToolTask" classpathref="project.class.path">
49 </taskdef>
50 <hbm2ddlTask destdir="${schema.dir}">
51 <configuration configurationfile="${class.root}/hibernate.cfg.xml" />
52 <hbm2ddl export="true" console="true" create="true" drop="true" />
53 </hbm2ddlTask>
54 </target>
55 </project>

 

hibernate.cfg.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE hibernate-configuration PUBLIC
 3 "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 5 <hibernate-configuration>
 6 <session-factory>
 7 <property name="dialect">org.hibernate.dialect.mysqlDialect</property>
 8 <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
 9 <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
10 <property name="connection.username">root</property>
11 <property name="connection.password"></property>
12 <property name="show_sql">true</property>
13 <mapping resource="cn/xieyuyan/Customer.hbm.xml" />
14 </session-factory>
15 </hibernate-configuration>

 

customer.hbm.xml:

 1 <?xml version="1.0"?>
 2 <!DOCTYPE hibernate-mapping PUBLIC
 3 "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 5 <hibernate-mapping>
 6 <class name="cn.xieyuyan.Customer" table="CUSTOMERS">
 7 <id name="id" column="ID" type="int">
 8 <generator class="increment" />
 9 </id>
10 <property name="name" column="NAME" type="string" not-null="true" />
11 <property name="email" column="EMAIL" type="string" not-null="true" />
12 <property name="password" column="PASSWORD" type="string"
13 not-null="true" />
14 <property name="phone" column="PHONE" type="string"></property>
15 <property name="address" column="ADDRESS" type="string"></property>
16 <property name="description" column="DESCRIPTION" type="text" />
17 <property name="birthday" column="BIRTHDAY" type="date" />
18 <property name="registeredTime" column="REGISTERED_TIME"
19 type="timestamp" />
20 </class>
21 </hibernate-mapping>

3.运行项目：

run as，ant build，刷新项目，工程目录如下：

 

其中Customer.java即为根据映射文件生成的java源文件，classes目录下为编译后的classes文件

查看数据库，发现新生成了一个customers表，即为根据映射文件生成的数据库文件