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mysql_list_fields

(PHP 4, PHP 5)

mysql_list_fieldsPobiera informacje o polach tabeli MySQL

Opis

resource mysql_list_fields ( string $baza , string $tabela [, resource $ identyfikator_połączenia ] )

mysql_list_fields() pobiera informacje o danej tabeli. Argumentami są nazwa bazy i nazwa tabeli. Zwracany jest wskaźnik wyniku, który może zostać użyty z funkcjami mysql_field_flags(), mysql_field_len(), mysql_field_name() i mysql_field_type().

Przykład #1 mysql_list_fields()

<?php
$link 
mysql_connect ('localhost','uzytkownik','haslo');

$fields mysql_list_fields('baza''tabela'$link);
$columns mysql_num_fields($fields);

for (
$i 0$i $columns$i++) {
    echo 
mysql_field_name($fields$i) . "\n";
}
?>

Powyższy przykład da następujący wynik:

pole1
pole2
pole3
...

Aby zachować zgodność z poprzednimi wersjami, można użyć również mysql_listfields(). Jest to jednak niezalecane.

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User Contributed Notes 6 notes

up
0
steve at tequilasolutions dot com
8 years ago
Note, using mysql_list_fields will change the currently selected database so subsequent mysql_query operations will be on the database in param 1 not the one selected with mysql_select_db
up
-1
rhyous at yahoo dot com
9 years ago
To make an array containing the names of a column from a table, you use the following simple script: (Note: using table1 with three columns)

<?php
$qColumnNames
= mysql_query("SHOW COLUMNS FROM table1",$db) or die("mysql error");
$numColumns = mysql_num_rows($qColumnNames);
$x = 0;
while (
$x < $numColumns)
{
   
$colname = mysql_fetch_row($qColumnNames);
   
$col[$colname[0]] = $colname[0];
   
$x++;
}

print_r($col);

/* it will have the following output
Array (
[firstcolumn] => firstcolumn
[secondcolumn] => secondcolumn
[thirdcolumn] => thirdcolumn
)
*/
?>

Or you can number the columns from zero.  This help when using it in conjunction with mysql_fetch_row to get an array.  You don't have to remember which number of the array a certain column is.

<?php
$qColumnNames
= mysql_query("SHOW COLUMNS FROM table1",$db) or die("mysql error");
$numColumns = mysql_num_rows($qColumnNames);
$x = 0;
while (
$x < $numColumns)
{
   
$colname = mysql_fetch_row($qColumnNames);
   
$col[$colname[0]] = $x;
   
$x++;
}

print_r($col);

/* it will have the following output
Array (
[firstcolumn] => 0
[secondcolumn] => 1
[thirdcolumn] => 2
)
*/
?>

To use it in conjuction with mysql_fetch_row:

<?php
$row
= mysql_fetch_row("SELECT * from table1",$db) or die("mysql error");
?>

You can now call $row[col[firstcolumn]].  This becomes useful when you have a lot of columns.
up
-1
mbevan at marginsoftware dot com
10 years ago
If you're willing to use a lot of functions to get a little information about fields in a table, this function is for you.  If you just want to get all the information you can find, you can use this:

<?php

// Taken from: http://ca.php.net/manual/en/function.mysql-field-flags.php
// Original by: amir at scrounch dot com
// Returns the name of the fields in the primary key for a table.
// Also keeps the fields in KEY order.  Handy.
function getPrimaryKeyOf($table) {
 
$keys = Array();

 
$query = sprintf("SHOW KEYS FROM `%s`", $table);
 
$result = mysql_query($query) or die(mysql_error());

  while (
$row = mysql_fetch_assoc($result)) {
    if (
$row['Key_name'] == 'PRIMARY' )
     
$keys[$row['Seq_in_index'] - 1] = $row['Column_name'];
  }

  return
$keys;
}

// Returns a bunch of information about a table...
// The name of the auto-increment field, if any, fields in the
// primary key (using the function above), and all information
// about all fields.
function getTableInformationOf($table) {
 
$information = array(
     
"auto"    => "",
     
"primary" => array(),
     
"fields"  => array()
    );

 
$information['primary'] = $this->getPrimaryKeyOf($table);

 
$result = mysql_query("DESC `$table`");
  while (
$field = mysql_fetch_assoc($result) ) {
   
$information['fields'][] = $field;
    if (
$field['Extra'] == "auto_increment" )
     
$information['auto'] = $field['Field'];
  }

  return
$information;
}

?>
up
-2
phpflow at gmail dot com
2 years ago
Below script is used to get all coloumn indormation of an table.When we are working custome ORM then we need to match the coloumn name with array keys.

<?php
function getColoumn($table) {
    
$result = mysql_query("SHOW COLUMNS FROM ". $table);
      if (!
$result) {
        echo
'Could not run query: ' . mysql_error();
      }
     
$fieldnames=array();
      if (
mysql_num_rows($result) > 0) {
        while (
$row = mysql_fetch_assoc($result)) {
         
$fieldnames[] = $row['Field'];
        }
      }

      return
$fieldnames;
}
?>
up
-4
perwool at seznam dot cz
6 years ago
Every my html table output begins with heading row containing the field names. For that purpose I accepted the short combination of MySQL function, giving me a result similar to the mysql_fetch_array() for the row of values. The following example shows the basic idea. It should be adapted for the specific use:

<?php
//...
$field_names = array_keys( mysql_fetch_array( mysql_query( $query, $link), MYSQL_ASSOC));
//...
?>

The advantage of this is, that it gives the names of the result, neither the field names of the whole table.
Please read the discussion about duplicate field names in SQL result carefully. The use, as shown in the example above, increments the pointer, hence some regular function, which does not, could be more useful :-)

Jan
up
-3
dom at brainwaveuk dot com
12 years ago
mysql_list_fields() retrieves information about the given table name but you can use something like mysql_fetch_field to retrieve the field names from a result source.
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