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