mssql_fetch_field

(PHP 4, PHP 5, PECL odbtp >= 1.1.1)

mssql_fetch_fieldGet field information

Warning

This function was REMOVED in PHP 7.0.0.

Alternatives to this function include:

说明

mssql_fetch_field ( resource $result [, int $field_offset = -1 ] ) : object

mssql_fetch_field() can be used in order to obtain information about fields in a certain query result.

参数

result

The result resource that is being evaluated. This result comes from a call to mssql_query().

field_offset

The numerical field offset. If the field offset is not specified, the next field that was not yet retrieved by this function is retrieved. The field_offset starts at 0.

返回值

Returns an object containing field information.

The properties of the object are:

  • name - column name. if the column is a result of a function, this property is set to computed#N, where #N is a serial number.
  • column_source - the table from which the column was taken
  • max_length - maximum length of the column
  • numeric - 1 if the column is numeric
  • type - the column type.

范例

Example #1 mssql_fetch_field() example

<?php
// Connect to MSSQL and select the database
mssql_connect('MANGO\SQLEXPRESS''sa''phpfi');
mssql_select_db('php');

// Send a select query to MSSQL
$query mssql_query('SELECT * FROM [php].[dbo].[persons]');

// Construct table
echo '<h3>Table structure for \'persons\'</h3>';
echo 
'<table border="1">';

// Table header
echo '<thead>';
echo 
'<tr>';
echo 
'<td>Field name</td>';
echo 
'<td>Data type</td>';
echo 
'<td>Max length</td>';
echo 
'</tr>';
echo 
'</thead>';

// Dump all fields
echo '<tbody>';

for (
$i 0$i mssql_num_fields($query); ++$i) {
    
// Fetch the field information
    
$field mssql_fetch_field($query$i);

    
// Print the row
    
echo '<tr>';
    echo 
'<td>' $field->name '</td>';
    echo 
'<td>' strtoupper($field->type) . '</td>';
    echo 
'<td>' $field->max_length '</td>';
    echo 
'</tr>';
}

echo 
'</tbody>';
echo 
'</table>';

// Free the query result
mssql_free_result($query);
?>

参见

User Contributed Notes

not a mail address 20-Aug-2008 03:22
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.
schattenfeld at gmail dot com 02-Aug-2007 07:43
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;
huszti_dot_roland_at_freemail_dot_com 11-May-2006 05:51
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.
php_rindern_de 25-Oct-2004 01:36
commenting Reynard Hilman:

for me it looks like the colstat field value of 1 in syscolumns table indicates an Identity Column.
Reynard Hilman 22-Oct-2003 07:40
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
bmaddy_at_class_dot_umn_dot_edu 29-Apr-2003 07:41
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
alonf at spiralsolutions dot com 28-Nov-2002 02:47
As kubalaa at bigfoot dot com note mssql_fetch_field->column_source return field name instead table name also with MSSQL2000 connection. Be adwised!!!
pong at taft dot org 15-Mar-2002 05:07
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.
skipsey at hotmail dot com 08-Feb-2001 07:58
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;

    }
}
?>
kubalaa at bigfoot dot com 04-Apr-2000 03:58
Using this function with MSSQL 7, $returned->column_source is the column name, not the table name as it should be.