mysqli_fetch_field
(PHP 5)
mysqli_fetch_field
(no version information, might be only in CVS)
result->fetch_field -- Returns the next field in the result set
Description
Procedural style:
mixed
mysqli_fetch_field ( mysqli_result result )
Object oriented style (method):
class
mysqli_result {
mixed
fetch_field ( void )
}
The mysqli_fetch_field() returns the definition of one column
of a result set as an object. Call this function repeatedly to retrieve
information about all columns in the result set.
mysqli_fetch_field() returns FALSE when no more fields
are left.
返回值
Returns an object which contains field definition information or FALSE if no field information
is available.
表格 1. Object properties
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 |
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(); }
$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";
if ($result = $mysqli->query($query)) {
/* Get field information for all columns */ while ($finfo = $result->fetch_field()) { 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\n", $finfo->type); } $result->close(); }
/* close connection */ $mysqli->close(); ?>
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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(); }
$query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5";
if ($result = mysqli_query($link, $query)) {
/* Get field information for all fields */ while ($finfo = mysqli_fetch_field($result)) { 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\n", $finfo->type); } mysqli_free_result($result); }
/* close connection */ mysqli_close($link); ?>
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上例将输出:
Name: Name
Table: Country
max. Len: 11
Flags: 1
Type: 254
Name: SurfaceArea
Table: Country
max. Len: 10
Flags: 32769
Type: 4 |