dBase Funzioni

Esempi

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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User Contributed Notes 3 notes

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1
bi.idan AT gmail.com
7 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
5 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
up
-1
Hadi Rusiah / deegos at yahoo dot com
9 years ago
If you are using PHP < 5, you can use this function to retrieve dbf header

<?
function get_dbf_header($dbfname) {
   $fdbf = fopen($dbfname,'r');

   $dbfhdrarr = array();
   $buff32 = array();
   $i = 1;
   $goon = true;

   while ($goon) {
      if (!feof($fdbf)) {
         $buff32 = fread($fdbf,32);
         if ($i > 1) {
            if (substr($buff32,0,1) == chr(13)) {
               $goon = false;
            } else {
               $pos = strpos(substr($buff32,0,10),chr(0));
               $pos = ($pos == 0?10:$pos);

               $fieldname = substr($buff32,0,$pos);
               $fieldtype = substr($buff32,11,1);
               $fieldlen = ord(substr($buff32,16,1));
               $fielddec = ord(substr($buff32,17,1));

array_push($dbfhdrarr, array($fieldname,$fieldtype,$fieldlen,$fielddec));

            }
         }
         $i++;
      } else {
         $goon = false;
      }
   }

   fclose($fdbf);
   return($dbfhdrarr);
}

$arr = get_dbf_header('/data/file.dbf');
print_r($arr);
?>
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