dBase 函数

    示例

    Many examples in this reference require a dBase database. We will use /tmp/test.dbf that will be created in the example of dbase_create().

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    4
    bi.idan AT gmail.com
    17 years ago
    I know lots of you dosent really use dbase, but i've builded a class to help the one how dose.
    (sorry for bad english)

    - dbase.php

    <?php

    set_time_limit     (0);
    // site_path defined by parent
    require_once (SITE_PATH. '/server/php/libs/dbase/handler.php');

    /* DBase (dbf)
    * manage dbf files, exports and search functionality
    * with buildin optimizers for fast performance
    */

    class DBase
    {
    private     $handler = false;
    private     $searchopt = array (); // Search optimizer

    private function unload ()
    {
    if (    $this-> handler !== false)
    unset (    $this-> handler);
    }

    public function     __construct ($file = false)
    {
    if (    $file !== false)
    $this-> load ($file);
    }

    public function     __destruct ()
    {
    $this-> unload ();
    }

    public function     load ($file)
    {
    $resource = dbase_open ($file, 0);
    $this-> handler = new DBase_Handler ($resource);

    return     $this-> handler;
    }

    /* Search
    * search for string inside header
    * returns record number
    * false returned if not found or error occurred
    * limit_results gets int or false, limit_results equels one will limit the
    * search results for one result only, false for no limit
    */
    public function search ($headerText, $string, $limit_results = false, $handler = false)
    {
    if (    $handler === false)
    $handler = $this-> handler;

    if (    $this-> searchopt [$headerText][$string])
    return     $this-> searchopt [$headerText][$string];
    else
    {
    $size = $handler-> getSize ();
    if ( (     $headerNumber = $handler-> getHeaderNumber ($headerText) ) !== false)
    {
    $results = array ();
    for (    $i = 1; $i < $size; $i++)
    {
    $record = $handler-> getRecord ($i, false); // Disabled optimizer to prevent memory overflow
    if (trim ($record [$headerNumber]) == $string)
    {
    $results[] = $i;

    if ( (    $limit_results !== false) && (sizeof ($results) == $limit_results) )
    break;
    }
    }

    if (    sizeof ($results) > 0)
    {
    $this-> searchopt [$headerText][$string] = $results;
    return     $this-> search ($headerText, $string, $handler);
    }

    return     false;
    } else
    return     false;
    }
    }
    }

    ?>

    - dbase_handler.php

    <?php

    /* DBase Handler (dbf)
    * handles dbase resource
    */

    class DBase_Handler
    {
    private     $resource;
    private     $size; // Records Count
    private $header = array ();
    private     $dataopt = array (); // Data optimizer

    private function setHeader ()
    {
    $this-> header = dbase_get_header_info ($this-> resource);
    }

    public function     __construct ($resource)
    {
    $this-> resource = $resource;
    $this-> setHeader ();
    $this-> size = dbase_numrecords ($this-> resource);
    }

    public function     __destruct ()
    {
    dbase_close ($this-> resource);
    }

    public function     getRecord ($record_number, $dataopt = true)
    {
    if (    $record_number > $this-> size)
    return     false;
    else
    {
    if (    $this-> dataopt [$record_number])
    return     $this-> dataopt [$record_number];
    else
    {
    $record = dbase_get_record ($this-> resource, $record_number);
    if (    $dataopt === true) // Data saving optimizer
    {
    $this-> dataopt [$record_number] = $record;
    return     $this-> getRecord ($record_number);
    } else
    return     $record;
    }
    }
    }

    public function     getHeaderNumber ($headerText)
    {
    foreach (    $this-> header as $index => $header)
    {
    if (    $header ['name'] == $headerText)
    {
    return     $index;
    break;
    }
    }

    return     false;
    }

    public function     getHeader ($headerNumber)
    {
    if (    $headerNumber <= sizeof ($this-> header))
    return     $this-> header [$headerNumber];
    else
    return     false;
    }

    public function     getSize ()
    {
    return     $this-> size;
    }
    }

    ?>
    up
    0
    bi.idan [at] gmail.com
    15 years ago
    some of you contacted me about memo fields and my script, so i'll just post my answers on the common question here.

    (note: this is not an adv for any program, only what i used for myself, and it's free)

    so, there are 2 options if you want to create/read memo fields:

    1. use a library for java/c++/c# to build a bridge between php and dbf file. i've used dbf2java. althougth it's not near complete as my other option, it's a good start. (http://code.google.com/p/dbf2java-library/)

    2. use an external program with pipes to grab the output. i used cdbflite, (http://www.whitetown.com/cdbflite/). it's free, and pretty much gives you everything you need to handle those dbf files. i'm not sure about big databases and it seems you need to register/buy it, but it's again, a start.

    hope it helps some of you who needs to handle those database files,

    Good luck,
    idan
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