【mybatis配置文件mapper.xml里每一项的作用 _mybatis 】

mybatis配置文件mapper.xml里每一项的作用

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mybatis

详细描述

错误截图

源码

package mybatis;

import java.io.IOException;
import java.io.InputStream;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class testStudent {
    public static void main(String[] args) throws IOException
    {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();
        try
        {
            Student stu = session.selectOne("mybatis.mapper.select", 1);
            System.out.println(stu.getName());
            stu = session.selectOne("mybatis.mapper.select", 2);
            System.out.println(stu.getName());
        }
        finally
        {
            session.close();
        }
    }
}

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: org.apache.ibatis.builder.IncompleteElementException: Could not find result map mybatis.Student
### Cause: org.apache.ibatis.builder.IncompleteElementException: Could not find result map mybatis.Student
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)
	at mybatis.testStudent.main(testStudent.java:20)
Caused by: org.apache.ibatis.builder.IncompleteElementException: Could not find result map mybatis.Student
	at org.apache.ibatis.builder.MapperBuilderAssistant.getStatementResultMaps(MapperBuilderAssistant.java:346)
	at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:290)
	at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:109)
	at org.apache.ibatis.session.Configuration.buildAllStatements(Configuration.java:788)
	at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:719)
	at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:714)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
	... 3 more
Caused by: java.lang.IllegalArgumentException: Result Maps collection does not contain value for mybatis.Student
	at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:888)
	at org.apache.ibatis.session.Configuration.getResultMap(Configuration.java:640)
	at org.apache.ibatis.builder.MapperBuilderAssistant.getStatementResultMaps(MapperBuilderAssistant.java:344)
	... 9 more

编辑于2024-11-22