PHP mysqli fetch_field() Funksie
Voorbeeld - Objekgeoriënteerde styl
Gee die volgende veld (kolom) in die resultaatstel terug en druk dan elke 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 all fields
while ($fieldinfo =
$result -> fetch_field()) {
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() / mysqli_fetch_field() funksie gee die volgende veld (kolom) in die resultaatstel terug as 'n objek.
Sintaksis
Objekgeoriënteerde styl:
$mysqli_result -> fetch_field()
Prosedure styl:
mysqli_fetch_field(result)
Parameterwaardes
Parameter | Description |
---|---|
result | Required. Specifies a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() |
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 die volgende veld (kolom) in die resultaatstel terug en druk dan elke 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, $sql)) {
// Get field information for all fields
while ($fieldinfo = mysqli_fetch_field($result)) {
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