Netbeans 中 JDBCRowSetImpl 和 CachedRowSetImpl 类的代码测试

Question

晚上好：D

I am studying the book "Programming in Java - Covers Java 10 to Java 14" ("Programmer en Java - Couvre Java 10 à Java 14" in French) by Claude Delannoy.

我正在尝试测试找到的代码示例：“Chapter 29: Using Databases with JDBC”（“Chapitre 29: Utilization de bases de données avec JDBC”）。 “7 - Rowset 接口”（“7 - L'interface Rowset”）。

对于 JDBCRowSetImpl class：

从 ResultSet 类型 object 构建

import java.sql.*;
import javax.sql.rowset.*; // for RowSet
import com.sun.rowset.JdbcRowSetImpl; // essential

public class Rowset
{ public static void main(String[] args) throws ClassNotFoundException, SQLException
  { Class.forName("com.mysql.cj.jdbc.Driver");
    Connection connec = DriverManager.getConnection
          ("jdbc:mysql://root@localhost:3306/stocks");
      // create a ResultSet
    String order = "SELECT name, quantity FROM products";
    Statement stmt = connec.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
                      ResultSet.CONCUR_UPDATABLE);
    ResultSet res;
    res = stmt.executeQuery(order);
      // creation of an envelope RowSet of the ResultSet and use
    JdbcRowSet rs = new JdbcRowSetImpl (res);
    String name; int qty;
      // small update
    rs.first();
    rs.updateString(1, "Coffee Maker 6 T");
    rs.updateRow();
      // list in reverse order
    rs.afterLast();
    while (rs.previous())
    { name = rs.getString (1); qty = rs.getInt (2);
      System.out.println (name + " " + qty);
    }
    stmt.close (); res.close (); rs.close (); connec.close();
  }
}

构建自主 object

import java.sql.*;
import javax.sql.rowset.*; // for rowset
import com.sun.rowset.JdbcRowSetImpl; // essential !!!

public class Rowset1
{ public static void main (String[] args) throws ClassNotFoundException, SQLException
  { Class.forName ("com.mysql.cj.jdbc.Driver");
    JdbcRowSet rs = new JdbcRowSetImpl ();
    rs.setUrl ("jdbc:mysql://root@localhost:3306/stocks");
    rs.setType (ResultSet.TYPE_SCROLL_SENSITIVE);
    rs.setConcurrency (ResultSet.CONCUR_UPDATABLE);
    rs.setCommand ("SELECT name, quantity FROM products");
    rs.execute();
      // small update
    rs.first();
    rs.updateString (1, "Coffee Maker 9 T");
    rs.updateRow();
      // list in reverse order
    String name; int qty;
    rs.afterLast();
    while (rs.previous())
    { name = rs.getString (1); qty = rs.getInt (2);
      System.out.println (name + " " + qty);
    }
    rs.close();
  }
}

对于 CachedRowSetImpl class

从 ResultSet 类型 object 构建

import java.sql.*;
import com.sun.rowset.CachedRowSetImpl; // or sun.rowset.CachedRowSetImpl
//import com.sun.rowset.JdbcRowSetImpl;
import javax.sql.rowset.*; // for CachedRowSet

public class Rowset3
{ public static void main (String[] args) throws ClassNotFoundException, SQLException
  { Class.forName ("com.mysql.cj.jdbc.Driver");
    Connection connec = DriverManager.getConnection
          ("jdbc:mysql://root@localhost:3306/stocks");
      // create a ResultSet
    String order = "SELECT name, quantity FROM products";
    Statement stmt = connec.createStatement();
    ResultSet res;
    res = stmt.executeQuery(order);
       // creation of an envelope RowSet of the ResultSet and use
    CachedRowSet rs = new CachedRowSetImpl();
    rs.populate(res); // we populate the CachedRowSet with the data from the ResultSet
       // small update of the first record
    rs.first();
    rs.updateString (1, "Coffee Maker 18 T");
    rs.updateRow();
    rs.acceptChanges(connec); // essential to provide connection info here
      // list in reverse order
    String name; int qty;
    rs.afterLast ();
    while (rs.previous())
    { name = rs.getString (1); qty = rs.getInt (2);
      System.out.println (name + " " + qty);
    }
    rs.close(); res.close ();
  }
}

构建自主 object

import java.sql.*;
import com.sun.rowset.CachedRowSetImpl; // or sun.rowset.CachedRowSetImpl
import javax.sql.rowset.*; // for CachedRowSet

public class Rowset2
{ public static void main (String[] args) throws ClassNotFoundException, SQLException
  { Class.forName ("com.mysql.cj.jdbc.Driver");
    CachedRowSet rs = new CachedRowSetImpl ();
    rs.setUrl ("jdbc:mysql://root@localhost:3306/stocks");
    rs.setType (ResultSet.TYPE_SCROLL_SENSITIVE);
    rs.setConcurrency (ResultSet.CONCUR_UPDATABLE);
    rs.setCommand ("SELECT name, quantity FROM products");
    rs.execute();
      // small update of the first record
    rs.first();
    rs.updateString (1, "Coffee Maker 15 T");
    rs.updateRow();
    rs.acceptChanges(); // essential here
      // list in reverse order
    String name; int qty;
    rs.afterLast();
    while (rs.previous())
    { name = rs.getString (1); qty = rs.getInt (2);
      System.out.println (name + " " + qty);
    }
    rs.close();
  }
}

我用：

• NetBeans 14
• JDK 17.0.3.1
• MySQL 连接器/J 8.0.30
• MySQL 5.7.17

当我尝试编译第一个代码和第二个代码时，我收到以下错误消息：

错误：package com.sun.rowset 不可见导入 com.sun.rowset.JdbcRowSetImpl； // 必不可少（包 com.sun.rowset 在模块 java.sql.rowset 中声明，它不会导出它）

当我尝试编译第 3 段代码和第 4 段代码时，出现以下错误消息：

错误：package com.sun.rowset 不可见导入 com.sun.rowset.CachedRowSetImpl; // 或 sun.rowset.CachedRowSetImpl （包 com.sun.rowset 在模块 java.sql.rowset 中声明，不导出）

该怎么办？

先谢谢了