dBase Funktionen

Beispiele

Für viele Beispiele dieses Abschnitts wird eine dBase-Datenbank benötigt. Wir werden die Datenbank /tmp/test.dbf verwenden, die im Beispiel von dbase_create() erzeugt wird.

Inhaltsverzeichnis

dbase_add_record — Hängt einen Datensatz an eine Datenbank an
dbase_close — Schließt eine Datenbank
dbase_create — Erzeugt eine Datenbank
dbase_delete_record — Markiert einen Datensatz als gelöscht
dbase_get_header_info — Liefert Informationen des Dateikopfs einer Datenbank
dbase_get_record — Liefert einen Datensatz aus einer Datenbank als indiziertes Array
dbase_get_record_with_names — Liefert einen Datensatz aus einer Datenbank als assoziatives Array
dbase_numfields — Liefert die Anzahl der Felder einer Datenbank
dbase_numrecords — Liefert die Anzahl der Datensätze einer Datenbank
dbase_open — Öffnet eine Datenbank
dbase_pack — Entfernt die als gelöscht markierten Datensätze aus einer Datenbank
dbase_replace_record — Ersetzt einen Datensatz in einer Datenbank

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User Contributed Notes 2 notes

down

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;
    }
}

?>

down

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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