dbffiledriver.java

TinySQL是一个轻量级的纯java数据库引擎

/*
 *
 * dbfFile/tinySQL JDBC driver
 *
 * A lot of this code is based on or directly taken from
 * George Reese's ([e-mail]) mSQL driver.
 *
 * So, it's probably safe to say:
 *
 * Portions of this code Copyright (c) 1996 George Reese
 *
 * The rest of it:
 *
 * Copyright 1996 John Wiley & Sons, Inc. 
 * See the COPYING file for redistribution details.
 *
 * $Author: davis $
 * $Date: 2004/12/18 21:32:10 $
 * $Revision: 1.1 $
 *
 */
package com.sqlmagic.tinysql;

import java.sql.Connection;
import java.sql.DriverPropertyInfo;
import java.sql.SQLException;
import java.sql.Driver;
import java.util.Properties;


/**
dBase read/write access <br> 
@author Brian Jepson <[e-mail]>
@author Marcel Ruff <[e-mail]> Added write access to dBase and JDK 2 support
*/
public class dbfFileDriver extends tinySQLDriver {

  /*
   *
   * Instantiate a new dbfFileDriver(), registering it with
   * the JDBC DriverManager.
   *
   */
  static {
    try {
      java.sql.DriverManager.registerDriver(new dbfFileDriver());
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  /**
   *
   * Constructs a new dbfFileDriver
   *
   */
  public dbfFileDriver() {
    super();
  }

  /**
   *
   * returns a new dbfFileConnection object, which is cast
   * to a tinySQLConnection object.
   *
   * @exception SQLException when an error occurs
   * @param user the username - currently unused
   * @param url the url to the data source
   * @param d the Driver object.
   *
   */
  public tinySQLConnection getConnection
                 (String user, String url, Driver d) 
                  throws SQLException {
    if ( url != (String)null )
    {
       if ( url.length() > 13 ) tinySQLGlobals.readLongNames(url.substring(13));
    }
    return (tinySQLConnection) new dbfFileConnection(user, url, d);
  }

  /**
   *
   * Check to see if the URL is a dbfFile URL. It should start
   * with jdbc:dbfFile in order to qualify.
   *
   * @param url The URL of the database.
   * @return True if this driver can connect to the given URL.
   *
   */
  public boolean acceptsURL(String url) throws SQLException {

    // make sure the length is at least twelve
    // before bothering with the substring
    // comparison.
    //
    if( url.length() < 12 ) {
      return false;
    }

    // if everything after the jdbc: part is
    // dbfFile, then return true.
    //
    return url.substring(5,12).equals("dbfFile");

  }

}