hibernate正向工程生成数据库
hibernate正向工程生成数据库
hibernate.cfg.xml
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<?xml
version='1.0'
encoding='UTF-8'?><!DOCTYPE
hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- Generated by MyEclipse Hibernate Tools. --><hibernate-configuration> <session-factory> <!-- 指定连接数据库所用的驱动 --> <property
name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 指定连接数据库的url,hibernate连接的数据库名 --> <property
name="connection.url">jdbc:mysql://localhost:3306/wsnsp</property> <property
name="connection.useUnicode">true</property> <property
name="connection.characterEncoding">gbk</property> <!-- 指定连接数据库的用户名 --> <property
name="connection.username">root</property> <!-- 指定连接数据库的密码 --> <property
name="connection.password">1111</property> <!-- 指定数据库方言 --> <property
name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> <!-- 根据需要自动创建数据库 --> <property
name="hbm2ddl.auto">create</property> <!-- 显示Hibernate持久化操作所生成的SQL --> <property
name="show_sql">true</property> <!-- 将SQL脚本进行格式化后再输出--> <property
name="hibernate.format_sql">true</property> <!-- 罗列所有的映射文件--> <mapping
resource="ty/change/wsn/entity/Coordinator.hbm.xml"/> <mapping
resource="ty/change/wsn/entity/EndDevice.hbm.xml"/> <mapping
resource="ty/change/wsn/entity/Router.hbm.xml"/> <mapping
resource="ty/change/wsn/entity/User.hbm.xml"/> <mapping
resource="ty/change/wsn/entity/ZigBeeNode.hbm.xml"/>
</session-factory></hibernate-configuration> |
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package
ty.change.wsn.action;import
org.hibernate.cfg.Configuration;import
org.hibernate.tool.hbm2ddl.SchemaExport;public
class CreateDB { public
static void
main(String[] args) { //装载配置文件
Configuration cfg =
new Configuration().configure();
SchemaExport export =
new SchemaExport(cfg);
export.create(true,
true);
}
} |
第一次运行程序时,将Hibernte中的hibernate.hbm2ddl.auto设置成create,让Hibernate帮助自动建表,但不成功,报了如下信息:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'type=InnoDB' at line 1。
后来,网上查找一番,发现是因为type=InnoDB在5.0以前是可以使用的,但5.1之后就不行了。如果我们把type=InnoDB改为engine=InnoDB就不会有这个问题。但是,我想使用Hibernate,自动帮我建表,怎么办呢。这就与我们指定的数据库方言(dialect)有关了。
之前我的配置是:
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<prop
key="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</prop> |
现在改为:
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<prop
key="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</prop> |
好了,这样问题就解决了。总结下:
Using 'MySQL5InnoDBDialect' works with 5.1 and 5.5 .
如果没有hbm.xml映射文件,而采用的是hibernate annotation方式,并且有hibernate配置文件cfg,只需要将hibernate.cfg.xml:
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<strong><?xml
version='1.0'
encoding='utf-8'?><!DOCTYPE
hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- hibernate配置 --> <property
name="connection.driver_class">com.mysql.jdbc.Driver</property> <property
name="connection.url">jdbc:mysql://localhost:3306/db_shome</property> <property
name="connection.username">root</property> <property
name="connection.password">1111</property> <property
name="dialect">org.hibernate.dialect.MySQLDialect</property> <property
name="hibernate.connection.pool.size">20</property>
<property
name="show_sql">true</property> <property
name="hbm2ddl.auto">create</property> <property
name="current_session_context_class">thread</property> <mapping
class="com.java1234.model.User"/> <mapping
class="com.java1234.model.Grade"/> <mapping
class="com.java1234.model.Student"/> </session-factory></hibernate-configuration></strong> |
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<strong><property
name="hbm2ddl.auto">create</property></strong> |
在数据库中新建对应的数据库名,启动工程后查询数据库(比如登录验证用户名密码)就可以生成数据库表了

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