mysqli_fetch_field_direct
(PHP 5)
mysqli_fetch_field_direct
(no version information, might be only in CVS)
result->fetch_field_direct --
Fetch meta-data for a single field
Description
Procedural style:
mixed
mysqli_fetch_field_direct ( mysqli_result result, int fieldnr )
Object oriented style (method):
class
mysqli_result {
mixed
fetch_field_direct ( int fieldnr )
}
mysqli_fetch_field_direct() returns an object which contains
field definition informations from specified resultset. The value of fieldnr must be in the
range from 0 to number of fields - 1.
返回值
Returns an object which contains field definition information or FALSE if no field information
for specified fieldnr is available.
表格 1. Object attributes
| 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. |
| 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) |
例
例子 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();
?>
|
|
例子 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);
?>
|
|
上例将输出：
Name: SurfaceArea
Table: Country
max. Len: 10
Flags: 32769
Type: 4 |