PHP mysqli fetch_field_direct() Funksie
Voorbeeld - Objekgeoriënteerde styl
Gee metadata vir 'n enkele veld in die resultaatstel terug, druk dan die veld se naam, tabel en maksimum lengte:
<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");
if ($mysqli -> connect_errno) {
echo "Failed to connect to MySQL: " .
$mysqli -> connect_error;
exit();
}
$sql = "SELECT Lastname, Age FROM Persons ORDER BY Lastname";
if ($result = $mysqli -> query($sql)) {
// Get field information for
column "Age"
$fieldinfo = $result -> fetch_field_direct(1);
printf("Name: %s\n", $fieldinfo -> name);
printf("Table: %s\n", $fieldinfo -> table);
printf("Max. Len: %d\n", $fieldinfo -> max_length);
$result
-> free_result();
}
$mysqli -> close();
?>
Kyk na voorbeeld van prosedurele styl onderaan.
Definisie en gebruik
Die fetch_field_direct() / mysqli_fetch_field_direct() funksie gee metadata vir 'n enkele veld in 'n resultaatstel, as 'n objek.
Sintaksis
Objekgeoriënteerde styl:
$mysqli_result -> fetch_field_direct(fieldnr)
Prosedure styl:
mysqli_fetch_field_direct(result, fieldnr)
Parameterwaardes
Parameter | Description |
---|---|
result | Required. Specifies a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() |
fieldnr | Required. Specifies the field number. Must be an integer from 0 to number of fields-1 |
Tegniese besonderhede
Terugkeerwaarde: | Wys 'n objek wat velddefinisie-inligting bevat. ONWAAR as geen inligting beskikbaar is nie. Die voorwerp het die volgende eienskappe:
|
---|---|
PHP weergawe: | 5+ |
Voorbeeld - Prosedurele styl
Gee metadata vir 'n enkele veld in die resultaatstel terug, druk dan die veld se naam, tabel en maksimum lengte:
<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();
}
$sql = "SELECT Lastname, Age FROM Persons ORDER BY Lastname";
if ($result = mysqli_query($con, $sql)) {
// Get field information for
column "Age"
$fieldinfo = mysqli_fetch_field_direct($result, 1);
printf("Name: %s\n", $fieldinfo -> name);
printf("Table: %s\n", $fieldinfo -> table);
printf("Max. Len: %d\n", $fieldinfo -> max_length);
mysqli_free_result($result);
}
mysqli_close($con);
?>
❮ PHP MySQLi-verwysing