dbffile.java

来自「有关JDBC的使用一些编程实例,有关与数据库连接的代码」· Java 代码 · 共 107 行

/*
 *
 * dbfFile - an extension of tinySQL for dbf file access
 *
 * 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.util.*;
import java.lang.*;
import java.io.*;

public class dbfFile extends tinySQL {

  public String dataDir = System.getProperty("user.home") + "/.tinySQL";

  /**
   *
   * Constructs a new dbfFile object
   *
   */
  public dbfFile() {

    super();

  }

  /**
   *
   * Constructs a new dbfFile object
   *
   * @param d directory with which to override the default data directory
   *
   */
  public dbfFile( String d ) {

    super();
    dataDir = d;

  }

  /**
   *
   * The DBF File class provides read-only access to DBF
   * files, so this baby should throw an exception.
   *
   */
  void CreateTable ( String table_name, Vector v ) 
    throws IOException, tinySQLException {

    throw new tinySQLException("The dbfFile engine is read-only");

  }

  /**
   *
   * Return a tinySQLTable object, given a table name.
   *
   * @param table_name
   * @see tinySQL#getTable
   *
   */
  tinySQLTable getTable (String table_name) throws tinySQLException {
    return (tinySQLTable) new dbfFileTable (dataDir, table_name);
  }

  /**
   *
   * The DBF File class provides read-only access to DBF
   * files, so this baby should throw an exception.
   *
   * @param fname table name
   * @see tinySQL#DropTable
   *
   */
  void DropTable (String fname) throws tinySQLException {

    throw new tinySQLException("The dbfFile engine is read-only");

  } 

  /*
   * regression test
   */
  public static void main(String argv[]) {

    dbfFile foo = new dbfFile(".");
    tsResultSet trs = null;

    try {
      trs = foo.sqlexec("SELECT * FROM PEOPLE");
    } catch (Exception e) {
      e.printStackTrace();
    }

    trs.PrintResultSet();

  }
}