jdbc_multi.java

有关JDBC的使用一些编程实例,有关与数据库连接的代码

/*
 * Copyright 1996 John Wiley & Sons, Inc. All Rights Reserved. Reproduction
 * or translation of this work beyond that permitted in Section 117 of the 1976
 * United States Copyright Act without the express written permission of the
 * copyright owner is unlawful. Requests for further information should be 
 * addressed to Permissions Department, John Wiley & Sons, Inc. The 
 * purchaser may make back-up copies for his/her own use only and not for 
 * distribution or resale. The Publisher assumes no responsibility for errors, 
 * omissions, or damages, caused by the use of this  software or from the use
 * of the information contained herein.
 *
 */
import java.net.URL;
import java.sql.*;

class jdbc_multi {

  public static void main(String argv[]) {

    try {
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance(); // JDBC-ODBC bridge
      Class.forName("com.sybase.jdbc.SybDriver").newInstance();    // Sybase
    } catch (Exception e) {
      e.printStackTrace();
    }

    try {

      // the url, userid, and password come in from argv, so error out if
      // they weren't passed.
      //
      if (argv.length < 3) {
         System.err.println("Usage:");
         System.err.println("");
         System.err.println("java jdbc_multi URL userid password");
         System.err.println("");
         System.err.println("  Examples:");
         System.err.println(
           "  java jdbc_multi jdbc:odbc:MSSQL javadb javadb");
         System.err.println(
           "  java jdbc_multi jdbc:sybase:Tds:localhost:4000 javadb javadb");
         System.exit(0);
      }

      String url  = argv[0];
      String user = argv[1];
      String pwd  = argv[2];

      // make a connection to the specified URL
      //
      Connection con = DriverManager.getConnection(url, user, pwd);

      // get a statement object
      //
      Statement stmt = con.createStatement();

      // execute a stored procedure
      //
      stmt.execute("{call multi_sample}");

      // get the first result set
      //
      ResultSet rs = stmt.getResultSet();

      // if the first result set wasn't null, 
      // the program should try to get the next
      // result set
      //
      boolean more_results;
      if (rs != null) {
        more_results = true;
      } else {
        more_results = false;
      }

      // keep getting results until there are no more
      // result sets to process
      //
      while(more_results) {
      
        // get each row and print it
        //
        boolean seen = false;
        while( rs.next() ) {

          String product = rs.getString(1);
          if (!seen) {
            System.out.println("ALL THE " + rs.getString(2) + "S.");
          }
          System.out.println("   " + product);
          seen = true;

        }

        // try to get another result set
        //
        more_results = stmt.getMoreResults();
        if (more_results) {
          rs = stmt.getResultSet();
        }

      }
   
      stmt.close();
      con.close();

    }
    catch( Exception e ) {
      System.out.println(e.getMessage());
      e.printStackTrace();
    }
  }

}