Question

我知道经常会问这个问题。

我得到以下映射错误。

我尝试了一些排列和组合我尝试了一些解决方案，似乎无法解决这个问题。

有人可以查看下面的配置吗？

xmls有效。
我使用hibernate 3和mysql作为数据库

错误日志：

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Initial SessionFactory creation failed.org.hibernate.InvalidMappingException: Could not parse mapping document from resource com/sample/Employee.hbm.xml
Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.sample.SessionFactoryUtil.<clinit>(SessionFactoryUtil.java:17)
    at com.sample.TestEmployee.main(TestEmployee.java:13)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from resource com/sample/Employee.hbm.xml
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:523)
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1511)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1479)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1458)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1432)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1352)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1338)
    at com.sample.SessionFactoryUtil.<clinit>(SessionFactoryUtil.java:12)
    ... 1 more
Caused by: org.hibernate.MappingException: invalid mapping
    at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:463)
    at org.hibernate.cfg.Configuration.addResource(Configuration.java:520)
    ... 8 more
Caused by: org.xml.sax.SAXParseException: The content of element type "id" must match "(meta*,column*,type?,generator?)".
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleEndElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.endElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.dom4j.io.SAXReader.read(SAXReader.java:465)
    at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:460)
    ... 9 more

Employee.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "//Hibernate/Hibernate Mapping DTD 3.0//EN/" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.sample.Employee" table="employee">
   <id name="idEmployee" column="ID">  
        <column name="uid" not-null="true"/>
        <generator class="native" />         
   </id>
   <property name="empName">
       <column name="empName" length="16" not-null="true" />
   </property>
   <property name="sex">
        <column name="sex" length="16" not-null="true" />
   </property>
</class>
</hibernate-mapping>

Employee class:
package com.sample;
public class Employee {

    private Long idEmployee;
    private String empName;
    private String sex;
    public Long getIdEmployee() {
        return idEmployee;
    }
    public void setIdEmployee(Long idEmployee) {
        this.idEmployee = idEmployee;
    }
    public String getEmpName() {
        return empName;
    }
    private String address;
    private int age;


    public void setEmpName(String empName) {
        this.empName = empName;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}
CREATE TABLE `employee` (
`idEmployee` int(11) NOT NULL AUTO_INCREMENT,
`empName` varchar(45) NOT NULL,
`sex` varchar(45) NOT NULL,
`age` int(11) DEFAULT NULL,
`address` varchar(45) DEFAULT NULL,
 PRIMARY KEY (`idEmployee`)
 );

Answer 1

我认为你错过了属性的映射＆＃34;地址＆＃34;和＆＃34;年龄＆＃34;。为什么你没有制作它们？并检查您使用的长度标签，为什么它们都等于16？
试试这个：

<hibernate-mapping>
<class name="com.sample.Employee" table="employee">
   <id name="idEmployee" column="ID">  
        <generator class="native" />         
   </id>
   <property name="empName" column="empName"></property>
   <property name="sex" column="sex"></property>
   <property name="address" column="address"></property>
   <property name="age" column="age"></property>
</class>
</hibernate-mapping>

Answer 2

例外说：

Caused by: org.xml.sax.SAXParseException: The content of element type "id" must match "(meta*,column*,type?,generator?)".

您的ID类型不匹配。在Employee类上，idEmployee变量类型为Long，在.hbm.xml文件中，您的ID属性映射具有native生成器，表示ID为Integer类型默认情况下。因此，您应该在ID属性上使用type="long"注释。或者只是尝试使用不同类型的ID生成器。在.hbm.xml文件中的ID注释中，您使用ID列的两个名称。您正在使用column="ID"和column="uid"。示例.hbm.xml文件应如何显示：

<hibernate-mapping>
     <class name="com.sample.Employee" table="employee">
        <id name="idEmployee" type="long">
            <column name="uid" not-null="true"/>
            <generator class="native" />
        </id>
        <property name="empName">
            <column name="empName" length="16" not-null="true" />
        </property>
        <property name="sex">
            <column name="sex" length="16" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

或尝试使用SequenceStyleGenerator。生成器，通过给定的序列名称为每个表创建单独的ID序列。生成的ID的默认类型为Long。 .hbm.xml文件示例：

 <hibernate-mapping>
    <class name="com.sample.Employee" table="employee">
        <id name="idEmployee" column="ID">
            <generator class="org.hibernate.id.enhanced.SequenceStyleGenerator">
                <param name="optimizer">none</param>
                <param name="increment_size">1</param>
                <param name="sequence_name">seq_employee_id</param>
            </generator>
        </id>
        <property name="empName">
            <column name="empName" length="16" not-null="true" />
        </property>
        <property name="sex">
            <column name="sex" length="16" not-null="true" />
        </property>
    </class>
 </hibernate-mapping>

我希望它可以帮助你...☺

元素类型“id”的内容必须匹配 - hbm xml

2 个答案: