构建 SqlSession 时出错

Question

我正在学习如何使用 Mybatis，我正在 tutorialpoint.com 上做教程。 [教程 link][1] 但我收到以下错误

这是我的配置文件

    <configuration>

       <environments default = "development">
          <environment id = "development">
             <transactionManager type = "JDBC"/> 

             <dataSource type = "POOLED">
                <property name = "driver" value = "com.mysql.jdbc.Driver"/>
                <property name = "url" value =     "jdbc:mysql://localhost:3306/details"/>
                <property name = "username" value = "root"/>
                <property name = "password" value = "f8802700@"/>
             </dataSource>   

          </environment>
       </environments>

   <mappers>
      <mapper resource = "MyBatisPractice/Student.xml"/>
   </mappers>

</configuration>

这是我的映射器文件

<?xml version = "1.0" encoding = "UTF-8"?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"   "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace = "Student">

   <insert id = "insert" parameterType = "Student">
      INSERT INTO STUDENT (NAME, BRANCH, PERCENTAGE, PHONE, EMAIL ) VALUES (#{name}, #{branch}, #{percentage}, #{phone}, #{email});

       <selectKey keyProperty = "id" resultType = "int" order = "AFTER">
          select last_insert_id() as id
      </selectKey>   

   </insert>

</mapper>

我完全按照教程显示的内容进行操作，但我在构建 SqlSession 时遇到错误。错误信息的第一部分

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:

Error building SqlSession.

The error may exist in SQL Mapper Configuration

Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber:

1; columnNumber: 16; Document root element "configuration", must match DOCTYPE root "null". at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:8) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:32) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:15) at MybatisInsert.main(MybatisInsert.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147) Caused by: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 16; Document root element "configuration", must match DOCTYPE root "null". at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:212) at org.apache.ibatis.parsing.XPathParser.(XPathParser.java:81) at org.apache.ibatis.builder.xml.XMLConfigBuilder.(XMLConfigBuilder.java:47) at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:28) ... 7 more Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 16; Document root element "configuration", must match DOCTYPE root "null". 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.dtd.XMLDTDValidator.rootElementSpecified(XMLDTDValidator.java:1599) at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1877) at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.startElement(XMLDTDValidator.java:742) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1358) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDriver.scanRootElementHook(XMLDocumentScannerImpl.java:1295) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3129) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:880) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:504) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:243) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:339) at org.apache.ibatis.parsing.XPathParser.createDocument(XPathParser.java:210) ... 10 more

感谢任何帮助我解决此问题的建议。

Answer 1

我解决了这个问题。教程中的配置文件缺少 DTD 验证检查。它在我添加验证检查后起作用。

<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Confi 3.0//EN" "http://www.mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

   <environments default = "development">
      <environment id = "development">
         <transactionManager type = "JDBC"/> 

         <dataSource type = "POOLED">
            <property name = "driver" value = "com.mysql.jdbc.Driver"/>
            <property name = "url" value = "jdbc:mysql://localhost:3306/details"/>
            <property name = "username" value = "root"/>
            <property name = "password" value = "f8802700@"/>
         </dataSource>   

      </environment>
   </environments>

   <mappers>
      <mapper resource = "Student.xml"/>
   </mappers>

</configuration>