Beanutils 的 ResultSetDynaSet 中的错误？

Question

我最近发现，JDBC有两种命名列的方式，即"by name"和"by label"，而显然"by label"方式是默认的。

实际上，列名概念似乎让我感到困惑。可能不仅对我而言，对 Beanutils autors 来说也是如此，因为他们默认按名称访问字段（导致无法访问任何具有列别名的查询）。同时they have property useColumnLabel，因为是内省后设置的，所以没有效果

这里是示例代码

import org.apache.commons.beanutils.*;

import java.lang.reflect.InvocationTargetException;
import java.sql.*;
import java.util.ArrayList;
import java.util.Iterator;

public class ResultSetIteratorAttempt {


   public static void main(String[] args) throws ClassNotFoundException, SQLException, InstantiationException, IllegalAccessException, InvocationTargetException, NoSuchMethodException {

      Connection conn = null;
      Statement stmt = null;

      Class.forName("com.mysql.jdbc.Driver");

      conn = DriverManager.getConnection("jdbc:mysql://localhost/sample","java","");

      stmt = conn.createStatement();

      ResultSet rs = stmt.executeQuery("SELECT Id as NM1, Name as NM2 FROM DayOfWeek;");

      ArrayList results = new ArrayList(); // To hold copied list

      ResultSetDynaClass rsdc = new ResultSetDynaClass(rs);
      rsdc.setUseColumnLabel(true);

      DynaProperty[] properties = rsdc.getDynaProperties();
      String propertyName = "";
      for(int i=0; i<properties.length; ++i) {
         propertyName = properties[i].getName();
         System.out.println(String.format("Property #%d is %s", i, propertyName));
      }

      Iterator rows = rsdc.iterator();
      DynaBean row;
      while (rows.hasNext()) {
         row = (DynaBean) rows.next();
         System.out.println(String.format("Row is %s", row.get(propertyName)));
      }

   }

}

我说得对吗？

UDPATE

mysql> select * from dayofweek;
+----+-----------+
| Id | Name      |
+----+-----------+
|  5 | Friday    |
|  1 | Monday    |
|  6 | Saturday  |
|  7 | Sunday    |
|  4 | Thursday  |
|  2 | Tuesday   |
|  3 | Wednesday |
+----+-----------+
7 rows in set (0.00 sec)

Answer 1

错误已知https://issues.apache.org/jira/browse/BEANUTILS-383

解决方法是使用替代构造函数签名，它接受三个参数。

Beanutils 的 ResultSetDynaSet 中的错误？

Bug in Beanutils' ResultSetDynaSet?

java

jdbc

introspection

bug-reporting

apache-commons-beanutils