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PHP5中文手册

maxdb_fetch_field_direct

result->fetch_field_direct

(No version information available, might be only in CVS)

result->fetch_field_direct — Fetch meta-data for a single field

说明

Procedural style:

mixed maxdb_fetch_field_direct ( resource $result , int $fieldnr )

Object oriented style (method):

result
mixed fetch_field_direct ( int $fieldnr )

maxdb_fetch_field_direct() returns an resource which contains field definition informations from specified resultset. The value of fieldnr must be in the range from 0 to number of fields - 1.

返回值

Returns an resource which contains field definition informations or FALSE if no field information for specified fieldnr is available.

Object attributes
Attribute Description
name The name of the column
max_length The maximum width of the field for the result set.
type The data type used for this field
decimals The number of decimals used (for integer fields)

范例

Example#1 Object oriented style

<?php
$maxdb 
= new maxdb("localhost""MONA""RED""DEMODB");

/* check connection */
if (maxdb_connect_errno()) {
   
printf("Connect failed: %s\n"maxdb_connect_error());
   exit();
}

$query "SELECT name, cno from hotel.customer ORDER BY name";

if (
$result $maxdb->query($query)) {

   
/* Get field information for column 'SurfaceArea' */
   
$finfo $result->fetch_field_direct(1);

   
printf("Name:     %s\n"$finfo->name);
   
printf("Table:    %s\n"$finfo->table);
   
printf("max. Len: %d\n"$finfo->max_length);
   
printf("Flags:    %d\n"$finfo->flags);
   
printf("Type:     %d\n"$finfo->type);

   
$result->close();
}

/* close connection */
$maxdb->close();
?>

Example#2 Procedural style

<?php
$link 
maxdb_connect("localhost""MONA""RED""DEMODB");

/* check connection */
if (maxdb_connect_errno()) {
   
printf("Connect failed: %s\n"maxdb_connect_error());
   exit();
}

$query "SELECT name, cno from hotel.customer ORDER BY name";

if (
$result maxdb_query($link$query)) {

   
/* Get field information for column 'cno' */
   
$finfo maxdb_fetch_field_direct($result1);

   
printf("Name:     %s\n"$finfo->name);
   
printf("Table:    %s\n"$finfo->table);
   
printf("max. Len: %d\n"$finfo->max_length);
   
printf("Flags:    %d\n"$finfo->flags);
   
printf("Type:     %d\n"$finfo->type);

   
maxdb_free_result($result);
}

/* close connection */
maxdb_close($link);
?>

The above examples would produce the following output:

Name:     CNO
Table:
max. Len: 4
Flags:    -1
Type:     0