tryplaceholders.java

来自「Java Classic Examples是我买的两本书：《JAVA经典实例》和」· Java 代码 · 共 39 行

import java.sql.*;

public class TryPlaceHolders
{
  public static void main(String[] args)
  {
    try
    {
      String url = "jdbc:odbc:technical_library";
      String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
      String user = "guest";
      String password = "guest";

      Class.forName(driver);
      Connection connection = DriverManager.getConnection(url);

      String changeLastName = "UPDATE authors SET lastname = ? WHERE authid = ?";
      PreparedStatement updateLastName = connection.prepareStatement(changeLastName);

      updateLastName.setString(1,"Booooob");        // Set lastname placeholder value
      updateLastName.setInt(2,27);               // Set author ID placeholder value

      int rowsUpdated = updateLastName.executeUpdate();       // execute the update
      System.out.println("Rows affected: " + rowsUpdated);

      connection.close();

   }
    catch (ClassNotFoundException cnfe)
    {
      System.err.println(cnfe);
    }
    catch (SQLException sqle)
    {
      System.err.println(sqle);
    }
  }
}