mysqli_field_seek

Set result pointer to a specified field offset (PHP 5)
bool mysqli_field_seek ( mysqli_result result, int fieldnr )

Procedural style:

Object oriented style (method):

mysqli_result {
  bool field_seek(int fieldnr);
}

Sets the field cursor to the given offset. The next call to mysqli_fetch_field() will retrieve the field definition of the column associated with that offset.

注意:

To seek to the beginning of a row, pass an offset value of zero.

返回值

mysqli_field_seek() returns previuos value of field cursor.

范例

例 1285. Object oriented style

<?php
$mysqli
= new mysqli("localhost", "my_user", "my_password", "world");

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

$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";

if (
$result = $mysqli->query($query)) {

   
/* Get field information for 2nd column */
   
$result->field_seek(1);
   
$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();
}

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

例 1286. Procedural style

<?php
$link
= mysqli_connect("localhost", "my_user", "my_password", "world");

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

$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";

if (
$result = mysqli_query($link, $query)) {

   
/* Get field information for 2nd column */
   
mysqli_field_seek($result, 1);
   
$finfo = mysqli_fetch_field($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);

   
mysqli_free_result($result);
}

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

上例将输出:

Name:     SurfaceArea
Table:    Country
max. Len: 10
Flags:    32769
Type:     4