maxdb_num_fields

maxdb_result::field_count

(PECL maxdb >= 1.0)

maxdb_num_fields -- maxdb_result::field_count — Get the number of fields in a result

说明

过程化风格

int maxdb_num_fields ( resource $result )

面向对象风格

int $maxdb_result->field_count;

maxdb_num_fields() returns the number of fields from specified result set.

返回值

The number of fields from a result set

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();
}

if ( $result  =  $maxdb -> query ( "SELECT * FROM hotel.city ORDER BY zip" )) {

    
    $field_cnt  =  $result -> field_count ;

    printf ( "Result set has %d fields.\n" ,  $field_cnt );

    
    $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();
}

if ( $result  =  maxdb_query ( $link ,  "SELECT * FROM hotel.city ORDER BY zip" )) {

    
    $field_cnt  =  maxdb_num_fields ( $result );

    printf ( "Result set has %d fields.\n" ,  $field_cnt );

    
    maxdb_free_result ( $result );
}

 
 maxdb_close ( $link );
 ?>

以上例程的输出类似于：

Result set has 3 fields.

参见

maxdb_fetch_field() - Returns the next field in the result set