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private void parseConfiguration(XNode root) {
    try {
      
      propertiesElement(root.evalNode("properties"));
      Properties settings = settingsAsProperties(root.evalNode("settings"));
      loadCustomVfs(settings);
      // 注册别名【3】
      typeAliasesElement(root.evalNode("typeAliases"));
      pluginElement(root.evalNode("plugins"));
      objectFactoryElement(root.evalNode("objectFactory"));
      objectWrapperFactoryElement(root.evalNode("objectWrapperFactory"));
      reflectorFactoryElement(root.evalNode("reflectorFactory"));
      //这里读取配置文件的缓存配置
      settingsElement(settings);
      // 获取环境下的配置（环境id）
      environmentsElement(root.evalNode("environments"));
      // 获取指定环境下的数据源配置【5】
      databaseIdProviderElement(root.evalNode("databaseIdProvider"));
      //注册java-jdbc的数据类型映射问题【4】
      typeHandlerElement(root.evalNode("typeHandlers"));
      //注册并实例化mapper接口【6】
      mapperElement(root.evalNode("mappers"));
    } catch (Exception e) {
      throw new BuilderException("Error parsing SQL Mapper Configuration. Cause: " + e, e);
    }
  }
  
  
  <mappers>
        <package name="com.ytao.main.mapper"/>
        // 或
        <mapper resource="mapper/studentMapper.xml"/>
        // 或
        <mapper url="file:///D:/mybatis-3-mybatis-3.4.6/src/main/resources/mapper/studentMapper.xml"/>
        // 或
        <mapper class="com.ytao.main.mapper.StudentMapper"/>
    </mappers>

public static void main(String[] args) throws Exception {
	Connection conn = getConnection(); 	
	String sql = "select * from user where 1=1 and id = ?";
	PreparedStatement stmt = conn.prepareStatement(sql);
	stmt.setString(1, "501440165655347200");
	ResultSet rs = stmt.executeQuery();
	while(rs.next()){
		String username = rs.getString("username");
		System.out.print("姓名: " + username);
	}
}


  @Override
  public List<Object> handleResultSets(Statement stmt) throws SQLException {
    ErrorContext.instance().activity("handling results").object(mappedStatement.getId());

    final List<Object> multipleResults = new ArrayList<>();

    int resultSetCount = 0;
    ResultSetWrapper rsw = getFirstResultSet(stmt);

    List<ResultMap> resultMaps = mappedStatement.getResultMaps();
    int resultMapCount = resultMaps.size();
    validateResultMapsCount(rsw, resultMapCount);
    while (rsw != null && resultMapCount > resultSetCount) {
      ResultMap resultMap = resultMaps.get(resultSetCount);
      handleResultSet(rsw, resultMap, multipleResults, null);
      rsw = getNextResultSet(stmt);
      cleanUpAfterHandlingResultSet();
      resultSetCount++;
    }

    String[] resultSets = mappedStatement.getResultSets();
    if (resultSets != null) {
      while (rsw != null && resultSetCount < resultSets.length) {
        ResultMapping parentMapping = nextResultMaps.get(resultSets[resultSetCount]);
        if (parentMapping != null) {
          String nestedResultMapId = parentMapping.getNestedResultMapId();
          ResultMap resultMap = configuration.getResultMap(nestedResultMapId);
          handleResultSet(rsw, resultMap, null, parentMapping);
        }
        rsw = getNextResultSet(stmt);
        cleanUpAfterHandlingResultSet();
        resultSetCount++;
      }
    }

    return collapseSingleResultList(multipleResults);
  }