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2017-05-15 13:59
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mybatis mapper配置错误

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">



select * from user where id = #{id}

以上是我的mapper的xml配置文件
然后测试的时候报错 报错信息为:
org.apache.ibatis.exceptions.PersistenceException:

Error building SqlSession.

The error may exist in sqlmap/User.xml

Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 26; 必须为元素类型 "mapper" 声明属性 "namespace"。

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)
at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:82)
at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:66)
at com.nullException.mybatis.first.MybatisFirst.init(MybatisFirst.java:22)
at com.nullException.mybatis.first.Test.main(Test.java:8)

Caused by: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 7; columnNumber: 26; 必须为元素类型 "mapper" 声明属性 "namespace"。
at org.apache.ibatis.builder.xml.XMLConfigBuilder.parseConfiguration(XMLConfigBuilder.java:109)
at org.apache.ibatis.builder.xml.XMLConfigBuilder.parse(XMLConfigBuilder.java:92)
at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:80)
... 3 more

初学者,问题可能很白痴,有了解的大神帮忙看一下哈

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