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mysqli_result::field_seek

mysqli_field_seek

(PHP 5, PHP 7, PHP 8)

mysqli_result::field_seek -- mysqli_field_seekSet result pointer to a specified field offset

Descrizione

Stile orientato agli oggetti

public mysqli_result::field_seek(int $index): true

Stile procedurale

mysqli_field_seek(mysqli_result $result, int $index): true

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.

Nota:

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

Elenco dei parametri

result

Solo nello stile procedurale: un identificatore di resultset restituito da mysqli_query(), mysqli_store_result() o mysqli_use_result().

index

The field number. This value must be in the range from 0 to number of fields - 1.

Valori restituiti

Always returns true.

Log delle modifiche

Versione Descrizione
8.0.0 This function now always returns true. Previously it returned false on failure.

Esempi

Example #1 Stile orientato agli oggetti

<?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();
?>

Example #2 Stile procedurale

<?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);
?>

I precedenti esempi visualizzeranno:

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

Vedere anche:

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