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(PHP 4, PHP 5, PECL odbtp >= 1.1.1)
mssql_fetch_field — Liefert Informationen über ein Feld
mssql_fetch_field() wird verwendet, um im Ergebnis einer Anfrage Informationen über Felder zu erhalten.
Der Bezeichner des Ergebnisses, das ausgewertet wird. Dieses Ergebnis stammt von einem Aufruf von mssql_query().
Der numerische Feld-Offset. Wurde kein Feld-Offset angegeben, liefert diese Funktion das nächste Feld, das noch nicht abgefragt wurde. Der field_offset beginnt bei Null.
Gibt ein Objekt mit Informationen über ein Feld zurück.
Die Eigenschaften dieses Objekts sind:
Beispiel #1 mssql_fetch_field()-Beispiel
<?php
// Mit MSSQL verbinden und Datenbank auswählen
mssql_connect('MANGO\SQLEXPRESS', 'sa', 'phpfi');
mssql_select_db('php');
// Eine Select-Anfrage an MSSQL senden
$anfrage = mssql_query('SELECT * FROM [php].[dbo].[persons]');
// Eine Tabelle bauen
echo '<h3>Tabellenstruktur für \'persons\'</h3>';
echo '<table border="1">';
// Tabellenkopf
echo '<thead>';
echo '<tr>';
echo '<td>Feldname</td>';
echo '<td>Datentyp</td>';
echo '<td>Max. Länge</td>';
echo '</tr>';
echo '</thead>';
// Alle Felder anzeigen
echo '<tbody>';
for ($i = 0; $i < mssql_num_fields($anfrage); ++$i) {
// Feldinformationen abrufen
$feld = mssql_fetch_field($anfrage, $i);
// Eine Zeile ausgeben
echo '<tr>';
echo '<td>' . $feld->name . '</td>';
echo '<td>' . strtoupper($feld->type) . '</td>';
echo '<td>' . $feld->max_length . '</td>';
echo '</tr>';
}
echo '</tbody>';
echo '</table>';
// Den Ergebnisspeicher freigeben
mssql_free_result($anfrage);
?>
kubalaa at bigfoot dot com first reported the problem that column_source contains the FIELD name instead of the source TABLE name 04-Apr-2000 03:58. The bug has been reported as well.
For those who wonder if it was fixed over the past 8 years: No, the bug still is the same, no workaround available.
If you want to describe table like DESCRIBE in MySQL you can use this:
$sql = <<<SQL
SELECT column_name,data_type,column_default,is_nullable
FROM
information_schema.tables AS t
JOIN
information_schema.columns AS c ON
t.table_catalog=c.table_catalog AND
t.table_schema=c.table_schema AND
t.table_name=c.table_name
WHERE
t.table_name='TABLE-NAME'
SQL;
For really detailed table information, use syscolumns, like this:
SELECT c.name, c.prec, c.scale, t.name type
FROM syscolumns c, systypes t, sysobjects o
WHERE o.name = 'yourtablename' AND o.id = c.id AND c.xtype = t.xtype
For other properties see the MS SQL online help. Search for 'syscolumns'.
Or an another solution:
sp_columns @table_name = 'yourtablename', @column_name = 'thecolumnname'
//no "select ..." !!!!
This gives info about only the specified column.
commenting Reynard Hilman:
for me it looks like the colstat field value of 1 in syscolumns table indicates an Identity Column.
If you want to describe table structure (like mysql 'desc table' command), sending this query might help:
<?
$sql = "SELECT c.name, c.isnullable, c.length, c.colstat, t.name type
FROM syscolumns c, systypes t, sysobjects o
WHERE o.name = '$table' AND o.id = c.id AND c.xtype = t.xtype";
?>
I suspect the colstat field in syscolumns table indicates primary key when its value is 1
Be aware that this function will only return the first 30 characters of the name of the column. If the actual column name is longer, it will be truncated. This is at least true with the following setup:
PHP 4.3.1
MSSQL 8.00.760
Have a good day everyone!
Brian
As kubalaa at bigfoot dot com note mssql_fetch_field->column_source return field name instead table name also with MSSQL2000 connection. Be adwised!!!
When you mssql_fetch_field(int result), you need to do loop to get the name of each field. Something like:
while($fld = mssql_fetch_field($rs)){
echo $fld->name . "<br>";
}
I am wondering why we cannot refer it by a field number.
It seems fairly hard to get a list of the tables from your database using MSSQL but this seems to do the trick. This is set to get only the User Tables and ignores the sytem tables.
<?php
mssql_connect("server","","") or die ("help me!");
mssql_select_db("") or die ("Noooo!");
$result = mssql_query ("sp_tables");
$fields = mssql_num_fields ($result);
$rows = mssql_num_rows ($result);
for ($f=0; $f<$rows; $f++) {
$CHKTYPE=GetField($result,"TABLE_TYPE",$f);
if($CHKTYPE=='TABLE'){
//$name = mssql_fetch_field($result, 2);
$field=GetField($result,"TABLE_NAME",$f)."<br>";
echo $field;
}
}
?>
Using this function with MSSQL 7, $returned->column_source is the column name, not the table name as it should be.
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