mysqli_result::fetch_fields
mysqli_fetch_fields
(PHP 5, PHP 7, PHP 8)
mysqli_result::fetch_fields -- mysqli_fetch_fields — Returns an array of objects representing the fields in a result set
Beschreibung
Objektorientierter Stil
Prozeduraler Stil
This function serves an identical purpose to the mysqli_fetch_field() function with the single difference that, instead of returning one object at a time for each field, the columns are returned as an array of objects.
Parameter-Liste
-
result
-
Nur bei prozeduralem Aufruf: Ein von mysqli_query(), mysqli_store_result(), mysqli_use_result() oder mysqli_stmt_get_result() zurückgegebenes mysqli_result-Objekt.
Rückgabewerte
Returns an array of objects containing field definition information.
Property | Description |
---|---|
name | The name of the column |
orgname | Original column name if an alias was specified |
table | The name of the table this field belongs to (if not calculated) |
orgtable | Original table name if an alias was specified |
max_length | The maximum width of the field for the result set. |
length | The width of the field, in bytes, as specified in the table definition. Note that this number (bytes) might differ from your table definition value (characters), depending on the character set you use. For example, the character set utf8 has 3 bytes per character, so varchar(10) will return a length of 30 for utf8 (10*3), but return 10 for latin1 (10*1). |
charsetnr | The character set number (id) for the field. |
flags | An integer representing the bit-flags for the field. |
type | The data type used for this field |
decimals | The number of decimals used (for integer fields) |
Beispiele
Beispiel #1 Objektorientierter Stil
<?php
$mysqli = new mysqli("127.0.0.1", "root", "foofoo", "sakila");
/* check connection */
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}
foreach (array('latin1', 'utf8') as $charset) {
// Set character set, to show its impact on some values (e.g., length in bytes)
$mysqli->set_charset($charset);
$query = "SELECT actor_id, last_name from actor ORDER BY actor_id";
echo "======================\n";
echo "Character Set: $charset\n";
echo "======================\n";
if ($result = $mysqli->query($query)) {
/* Get field information for all columns */
$finfo = $result->fetch_fields();
foreach ($finfo as $val) {
printf("Name: %s\n", $val->name);
printf("Table: %s\n", $val->table);
printf("Max. Len: %d\n", $val->max_length);
printf("Length: %d\n", $val->length);
printf("charsetnr: %d\n", $val->charsetnr);
printf("Flags: %d\n", $val->flags);
printf("Type: %d\n\n", $val->type);
}
$result->free();
}
}
$mysqli->close();
?>
Beispiel #2 Prozeduraler Stil
<?php
$link = mysqli_connect("127.0.0.1", "my_user", "my_password", "sakila");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
foreach (array('latin1', 'utf8') as $charset) {
// Set character set, to show its impact on some values (e.g., length in bytes)
mysqli_set_charset($link, $charset);
$query = "SELECT actor_id, last_name from actor ORDER BY actor_id";
echo "======================\n";
echo "Character Set: $charset\n";
echo "======================\n";
if ($result = mysqli_query($link, $query)) {
/* Get field information for all columns */
$finfo = mysqli_fetch_fields($result);
foreach ($finfo as $val) {
printf("Name: %s\n", $val->name);
printf("Table: %s\n", $val->table);
printf("Max. Len: %d\n", $val->max_length);
printf("Length: %d\n", $val->length);
printf("charsetnr: %d\n", $val->charsetnr);
printf("Flags: %d\n", $val->flags);
printf("Type: %d\n\n", $val->type);
}
mysqli_free_result($result);
}
}
mysqli_close($link);
?>
Die obigen Bespiele erzeugen folgende Ausgabe:
====================== Character Set: latin1 ====================== Name: actor_id Table: actor Max. Len: 3 Length: 5 charsetnr: 63 Flags: 49699 Type: 2 Name: last_name Table: actor Max. Len: 12 Length: 45 charsetnr: 8 Flags: 20489 Type: 253 ====================== Character Set: utf8 ====================== Name: actor_id Table: actor Max. Len: 3 Length: 5 charsetnr: 63 Flags: 49699 Type: 2 Name: last_name Table: actor Max. Len: 12 Length: 135 charsetnr: 33 Flags: 20489
Siehe auch
- mysqli_num_fields() - Gets the number of fields in the result set
- mysqli_fetch_field_direct() - Fetch meta-data for a single field
- mysqli_fetch_field() - Returns the next field in the result set