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maxdb_fetch_field

maxdb_result::fetch_field

(PECL maxdb >= 1.0)

maxdb_fetch_field -- maxdb_result::fetch_fieldReturns the next field in the result set

说明

过程化风格

mixed maxdb_fetch_field ( resource $result )

面向对象风格

mixed maxdb_result::fetch_field ( void )

The maxdb_fetch_field() returns the definition of one column of a result set as an resource. Call this function repeatedly to retrieve information about all columns in the result set. maxdb_fetch_field() returns FALSE when no more fields are left.

返回值

Returns an resource which contains field definition information or FALSE if no field information is available.

Object properties
Property 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 面向对象风格

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


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

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

if (
$result  $maxdb -> query ( $query )) {

   

   
while ( $finfo  $result -> fetch_field ()) {

       
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\n" $finfo -> type );
   }
   
$result -> close ();
}


$maxdb -> close ();
?>

Example #2 过程化风格

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


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

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

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

   

   
while ( $finfo  maxdb_fetch_field ( $result )) {

       
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\n" $finfo -> type );
   }
   
maxdb_free_result ( $result );
}


maxdb_close ( $link );
?>

以上例程的输出类似于:

Name:     NAME
Table:
max. Len: 10
Flags:    -1
Type:     2Name:     CNO
Table:
max. Len: 4
Flags:    -1
Type:     0

参见

  • maxdb_num_fields() - Get the number of fields in a result
  • maxdb_fetch_field_direct() - Fetch meta-data for a single field
  • maxdb_fetch_fields() - Returns an array of resources representing the fields in a result set
  • maxdb_field_seek() - Set result pointer to a specified field offset
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