PHP Dokumentation: Mysqli-result fetch-field-direct
12. Januar 2010 von werner
mysqli_result::fetch_field_direct
mysqli_fetch_field_direct
(PHP 5)
mysqli_result::fetch_field_direct — mysqli_fetch_field_direct — Fetch meta-data for a single field
Beschreibung
Object oriented style (method):
Procedural style:
Returns an object which contains field definition information from the specified result set.
Parameter-Liste
- result
Nur bei prozeduralem Aufruf: Ein vonmysqli_query(), mysqli_store_result()oder mysqli_use_result() zurückgegebenesErgebnisobjekt.
- fieldnr
The field number. This value must be in the range from 0 to number of fields – 1.
Rückgabewerte
Returns an object which contains field definition information or FALSE if no field information for specified fieldnr is available.
| Attribute | 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 |
| def | The default value for this field, represented as a string |
| max_length | The maximum width of the field for the result set. |
| length | The width of the field, as specified in the table definition. |
| charsetnr | The character set number 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 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 Name LIMIT 5";if (
$result = $mysqli->query($query)) {
/* Get field information for column 'SurfaceArea' */
$finfo = $result->fetch_field_direct(1);
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", $finfo->type);
$result->close();
}/* close connection */
$mysqli->close();
?>Beispiel #2 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 Name LIMIT 5";if (
$result = mysqli_query($link, $query)) {
/* Get field information for column 'SurfaceArea' */
$finfo = mysqli_fetch_field_direct($result, 1);
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", $finfo->type);
mysqli_free_result($result);
}/* close connection */
mysqli_close($link);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
Name: SurfaceAreaTable: Countrymax. Len: 10Flags: 32769Type: 4
Siehe auch
- mysqli_num_fields() – Get the number of fields in a result
- mysqli_fetch_field() – Returns the next field in the result set
- mysqli_fetch_fields() – Returns an array of objects representing the fields in a result set
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