中文命名之Hibernate 4 + MySQL演示
最近有个契机, 需要在一个给定开发环境中验证中文命名的可行性. 达成的例子源码在: HibernateExampleZh
当前用的是Hibernate 3.3.2.GA. 之后测试了更多版本, 彩蛋见最后一部分.
测试环境:
- Windows 7 Pro 64bit, JDK 1.7.0_80, MySQL 5.5.62, Eclipse Kepler SR2
- MacOS 10.13.6, JDK 1.8.0_45, MySQL 5.5.24, Eclipse 4.7.3a
功能验证:
运行com.codeinchinese.App, 在数据库表中插入一条记录并进行一次条件查询.
数据库
需修改hibernate.cfg.xml中的数据库用户/密码部分.
DROP TABLE IF EXISTS `演示`.`客户`;
CREATE TABLE `演示`.`客户` (
`客户_ID` bigint(20) unsigned COLLATE utf8_unicode_ci NOT NULL AUTO_INCREMENT,
`姓名` varchar(45) COLLATE utf8_unicode_ci NOT NULL,
`创建日期` datetime COLLATE utf8_unicode_ci NOT NULL,
PRIMARY KEY (`客户_ID`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COLLATE utf8_unicode_ci;
ALTER TABLE `演示`.`客户`
ADD INDEX `姓名_索引` (`姓名` ASC) ;
Java
public class 客户类 implements java.io.Serializable {
private Long 客户_ID;
private String 姓名;
private Date 创建日期;
public 客户类() {
}
public 客户类(String 姓名, Date 创建日期) {
this.姓名 = 姓名;
this.创建日期 = 创建日期;
}
public Long get客户Id() {
return this.客户_ID;
}
public void set客户Id(Long 客户Id) {
this.客户_ID = 客户Id;
}
public String get姓名() {
return this.姓名;
}
public void set姓名(String 姓名) {
this.姓名 = 姓名;
}
public Date get创建日期() {
return this.创建日期;
}
public void set创建日期(Date 创建日期) {
this.创建日期 = 创建日期;
}
@Override
public String toString() {
return 客户_ID + " " + 姓名 + " " + 创建日期;
}
}
Hibernate映射文件
<hibernate-mapping>
<class name="com.codeinchinese.客户.模型.客户类" table="客户">
<id name="客户Id" type="java.lang.Long">
<column name="客户_ID" />
<generator class="identity" />
</id>
<property name="姓名" type="string">
<column name="姓名" length="45" not-null="true" />
</property>
<property name="创建日期" type="timestamp">
<column name="创建日期" length="19" not-null="true" />
</property>
</class>
</hibernate-mapping>
检查更多Hibernate版本
经测试, 到4.2.21.Final都正常运行, 但从5.0.0.Final开始到最近的6.0.0.Alpha2, 都不支持模型类名的中文命名. 具体报错如下:
Caused by: org.xml.sax.SAXParseException; lineNumber: 6; columnNumber: 58; cvc-pattern-valid: Value 'com.codeinchinese.客户.模型.客户类' is not facet-valid with respect to pattern '([a-zA-Z_$][a-zA-Z\d_$]*\.)*[a-zA-Z_$][a-zA-Z\d_$]*' for type 'ClassNameType'.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:452)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3230)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.processOneAttribute(XMLSchemaValidator.java:2825)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.processAttributes(XMLSchemaValidator.java:2762)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:2050)
at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:740)
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.startElement(ValidatorHandlerImpl.java:570)
at com.sun.xml.bind.v2.runtime.unmarshaller.ValidatingUnmarshaller.startElement(ValidatingUnmarshaller.java:101)
at com.sun.xml.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:75)
at com.sun.xml.bind.v2.runtime.unmarshaller.StAXEventConnector.handleStartElement(StAXEventConnector.java:261)
at com.sun.xml.bind.v2.runtime.unmarshaller.StAXEventConnector.bridge(StAXEventConnector.java:130)
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:460)
修改为英文类名com.codeinchinese.customer.model.Customer后, 保留MySQL中文命名和Hibernate相关映射, 仍能运行.
考虑到这是从版本4到5的功能退化, 而且在6.0版本并无修复的意思, 应该提issue反馈一下.