ODBC 函数
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odbc_field_name

(PHP 4, PHP 5)

odbc_field_name — Get the columnname

说明

string odbc_field_name ( resource $result_id , int $field_number )

Gets the name of the field occupying the given column number in the given result identifier.

参数

result_id

The result identifier.

field_number

The field number. Field numbering starts at 1.

返回值

Returns the field name as a string, or FALSE on error.

ODBC 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Get the columnname

用户评论:

anuga at anuga dot se (27-Apr-2009 08:46)

I've been toying around with this for awhile to make it as simple and fast as possible.
 
<?php

/* Start The Connection */
if(!$odbc['connection'] = odbc_connect('DNS','USER','PASS'))
{
    exit("Connection Failed<br />\n");
}
else
{
    echo("Connected<br />\n");
}

/* Select Which Table */
$odbc['table'] = "table";

/* Fetch The Fieldnames into an Array */
if($result = odbc_exec($odbc['connection'],"select * from $odbc['table'];"))
{
    for($i = 1;$i <= odbc_num_fields($result);$i++)
    {
        $odbc['rows']['fields'][$i] = odbc_field_name($result,$i);
    }
    unset($i);
    odbc_free_result($result);
}
else
{
    exit("Error in SQL Query");
}

/* Close The Connection */
if(odbc_close($odbc['connection']))
{
    odbc_close($odbc['connection']);
}

/* Print The Array */
if(!empty($odbc['rows']))
{
    print_r($odbc['rows']);
}

?>

sica at wnet dot com dot br (05-Nov-2008 06:39)

Hi hayes029, your idea was very helpful.
Here go a adaptation for select form field.
<?php
  $consulta = "select * from schema.table";
  $resposta = odbc_exec($con, $consulta);
  for($i=1; $i <= odbc_num_fields($resposta); $i++)
    echo "<option value=".odbc_field_name($resposta, $i).">".odbc_field_name($resposta, $i)."</option>";
?>

marco (14-Feb-2008 02:08)

we faced the 31 char limit using cakephp dbo_odbc.php class (version 1.1.18.5850)

at the end, it calls odbc_fetch_row giving the problem (i tracked it may be due to the php implementation of a ODBCv2 model, which has hard coded 4bytes, 32 bits file names length, while ODBCv3 seems to have a separate specification of that value, fwiw)

we learned from another user (having similar problems with dbo_mssql.php class) how to workaround this problem,

we solved using inheritance, redefining the method (locally to our application) in order to
- create a "map" of the query fields (as an array) before executing it
- execute the query in a non-associative way
- after the results are returned, restore the real field names applying the previous created "map"

another way could be use the COM like:
new COM("ADODB.Connection")
which does not show the 31 chars problem but it could be slower and bound to the windows platform.

NoEgzit (22-Nov-2007 02:23)

If you really need more than 31 characters here's what you can do:

open php5.x.x/ext/odbc/php_odbc_includes.h in an editor like notepad++

change 32 by a greater value in
typedef struct odbc_result_value {
    char name[32];
    char *value;
    SDWORD vallen;
    SDWORD coltype;
} odbc_result_value;

and recompile php.

I did it with char name[64] cause I have column names like "0214_1_VD_Type d'exploitation Type d'opération (Niveau 1)"  [I didn't choose this stupid name it comes from Eccairs project]
and rebuild php with the method given here http://www.php.net/manual/en/install.windows.building.php  and http://elizabethmariesmith.com/2006/11/09/
compiling-php52-on-windows-with-net-toolchain-is-it-even-possible/

with visual C++ express edition.

jezzghost (21-Feb-2006 06:32)

Note that there is a known limitation with this which truncates the length of the returned field name to 31 characters without warning.

hayes029 at bama dot ua dot edu (13-Apr-2004 06:01)

In search of a function that would simply return an array with the names of the fields in a result identifier, the only thing I could find was the odbc_field_name function.  So, for anyone else looking for such a function, here's the (very simple) function I wrote:

function odbc_field_names ($result) {
  for ($i=1; $i <= odbc_num_fields($result); $i++) $return_array[$i-1] = odbc_field_name($result, $i);
  return $return_array;
}

Very simple, I know, but I thought it might be helpful.

andrea dot galli at acotel dot com (29-Apr-2003 04:12)

Example: function field name.

$Link_ID = odbc_connect("DSN", "user", "pass");

$query = "SELECT * FROM products";

$Query_ID = odbc_exec($Link_ID, $query);

while($field = $field_name($Query_ID ))
{
     echo("Field: $field<br />\n");
}

---------------------

function field_name($PrQuery_ID)
{      
     if($Column < odbc_num_fields($PrQuery_ID))
     {      
          $Column += 1;
          $FieldName = odbc_field_name($PrQuery_ID, $Column);

          return $FieldName;
     }      
     else   
     {      
          return 0;
     }      
}

aleckzandr at yahoo dot com (17-Apr-2003 08:04)

Well, I've been into PHP for four hours and thanks to "my predecessors before me" (gold163, curt, et al.) I've managed the following. The first thing I try to learn with any web scripting language is to build a dynamic table from a data source. (One thing you didn't have to do gold -previous post- is build an array for the field value.) Cheers! Alex

<html>
 <head>
  <title>PHP Database Example</title>
 </head>
 <style type="text/css">
 <!--
  body {font: 10pt/12pt Tahoma, Verdana, Helvetica, sans-serif; color: indigo; margin: .25in .5in }
  table {color:Navy; background-color:AntiqueWhite; border-color:Maroon; border-style:Solid; border-width: 2px; }
  th {color: blue; font-weight: bold; }
  td {font-size: smaller; }
  .mytable {color:Maroon; background-color:White; border-color:Navy; border-style:Solid; border-width: 1px; }
  th.mytable {background-color:#C0C0C0; }
 //-->
 </style>
 <body>

 <p><?php echo date("j F, Y"); ?></p>
<?php

$db = odbc_connect("eSell22MDB","","");
$result = odbc_exec($db, "select ProductID, ProductName, Description1 from Products");

// cool function - returns table
odbc_result_all($result, "border=\"1\" class=\"def\"");

$result = odbc_exec($db, "select * from Products") or die("Select failed");

$myUtil = new Utilities();

$myUtil->standard_table($result,"mytable");

class Utilities {

     function standard_table($result,$class="")
     {
         // To format your table if you want to use cascading style sheets
         if ($class == "")
         {
             $css_table = " border=\"1\"";
             $css_tr = "";
             $css_th = "";
             $css_td = "";
         }
         else
         {
             $css_table = " class=\"$class\"";
             $css_tr = " class=\"$class\"";
             $css_th = " class=\"$class\"";
             $css_td = " class=\"$class\"";
         }

         // Create field names for table header row
         $i = 0;
         $fieldCount = odbc_num_fields($result);
         echo "  <table$css_table>\n";
         echo "   <tr$css_tr>\n";

         while ($i < $fieldCount)
         {
             $i++;
             $fieldName = odbc_field_name($result, $i);
             echo "    <th$css_th>$fieldName</th>\n";
         }
         echo "   </tr>\n";

         # Create table data rows for query result
         while (odbc_fetch_row($result))
         {
             $i = 0;
             echo "   <tr$css_tr>\n";
             while ($i < $fieldCount)
             {
                 $i++;
                 $fieldData = trim(odbc_result($result, $i));
                 if ($fieldData  == "")
                     echo "    <td$css_td>&nbsp;</td>\n";
                 else
                     echo "    <td$css_td>$fieldData</td>\n";
             }
             echo "   </tr>\n";
         }
         echo "  </table>";
     }
} // class Utilities

?>

 </body>
</html>

gold163 at lisco dot com (26-Mar-2003 05:10)

Using your code, and taking it a step further, I can create a standard table from a single line of code by calling a function from my include file - the bonus is, that I can optionally provide a parameter for the name of my style sheet class - further simplifying my formatting of the table.

What synergy you find in these forums - eh?

$Conn = odbc_connect('dsn','user','pass');
$query = "SELECT * FROM yourtable";
$result = odbc_exec($Conn, $query) or die('Select failed!');

standard_table($result);

Function standard_table($result,$class='')
{
# To format your table if you want to use cascading style sheets
 if ($class == '')
 {
  $css_table = ' border=1';
  $css_tr = '';
  $css_th = '';
  $css_td = '';
 }
 else
 {
  $css_table = ' class=\"$class\"';
  $css_tr = ' class=\"$class\"';
  $css_th = ' class=\"$class\"';
  $css_td = ' class=\"$class\"';
 }

# Create field names for table header row
$i = 0;
$fCount = odbc_num_fields($result);
echo "<table$css_table><tr>";
  while ($i < $fCount)
  {
    $i++;
    $fName = odbc_field_name($result, $i);
    echo "<th>$fName</th>";
  }
echo "</tr>";

# Create table data rows for query result
$i = 0;
$fCount = odbc_num_fields($result);
while (odbc_fetch_row($result))
{
echo "<tr>";
  while ($i < $fCount)
  {
    $i++;
    $fName = odbc_field_name($result, $i);
    $job[$fName] = odbc_result($result, $i);
    echo "<td>$job[$fName]</td>";
  }
echo "</tr>";
$i = 0;
}
echo "</table>";
}

curt at digmo dot com (01-Aug-2001 02:58)

I turned Jason's code into a function to roughly mimic the mysql_fetch_array function. I'm not a programmer and I've been messing with PHP less than a week, so I imagine there's a more efficient method that what I've come up with.


function odbc_fetch_array($rownum, $res)
{

$i = 0;
$fCount = odbc_num_fields($res);
odbc_fetch_row($res, $rownum);
    while ($i < $fCount)
        {
    $i++;
    $fName = odbc_field_name($res, $i);
    $myrow[$fName] = odbc_result($res, $i);
          }
$i=0;
return $myrow;
}

(11-Mar-2001 12:11)

Wow, I finally have something to contribute.
If you, like me, have been seeking a way to name and fill your variables with the appropriate names an values, rather than naming every variable and using odbc_result($result, 1), odbc_result($result, 2), etc...Then this little loop is for you!  It would probably be nice to use as function, but I'm sure you can do that on your own, eh?

<?php
$query = "SELECT * FROM TableName";
$result = odbc_exec($conn, $query) or die('Select failed!');
$i = 0;
$fCount = odbc_num_fields($result);

while (odbc_fetch_row($result)) {
    while ($i < $fCount) {
        $i++;
        $fName = odbc_field_name($result, $i);
        $job[$fName] = odbc_result($result, $i);
    }
    $i=0;
}
?>

This should be pretty simple code to follow, you can address your variables at any time later using the column names from your table.  For now I am addressing them with their real values and using this simply to avoid having to type out all the variable names in the top of my code.  Have fun.

Jason/ArtHacker.com