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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
DescriptionProcedural style: object mysqli_fetch_field_direct ( mysqli_result result, int fieldnr ) Object oriented style (method): class mysqli_result { object 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");
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)) {
$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();
}
$mysqli->close();
?>
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例子 2. Procedural style |
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
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)) {
$finfo = mysqli_fetch_field_direct($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);
}
mysqli_close($link);
?>
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上例将输出： Name: SurfaceArea
Table: Country
max. Len: 10
Flags: 32769
Type: 4 |
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mysqli_fetch_assoc