code: public String fetchTypeName(IntrospectedColumn introspectedColumn){
  		
  		String columnName = introspectedColumn.getActualColumnName();
  		String catalog = introspectedColumn.getIntrospectedTable().getTableConfiguration().getCatalog();
  		String schema = introspectedColumn.getIntrospectedTable().getTableConfiguration().getSchema();
  		String table = introspectedColumn.getIntrospectedTable().getTableConfiguration().getTableName();
  		String dataType = null;
  		try {
  			ResultSet set = connection.getMetaData().getColumns(catalog, schema, table, columnName);
  			while(set.next()){
  				dataType = set.getString("TYPE_NAME");
  			}
  		} catch (SQLException e) {
  			e.printStackTrace();
  		}
  		
  		return dataType;
  	}
docs: /*
  根据MBG探测到的数据库表的元数据获取字段的类别名称
  @author Pin Liu