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PHP Quiz PHP CertificatePHP mysqli_fetch_field_direct() Function
Example
Return meta-data for a single field (column) in the result set, then print the field's name, table, and max length:
<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Get field information for "Age"
$fieldinfo=mysqli_fetch_field_direct($result,1);
printf("Name: %s\n",$fieldinfo->name);
printf("Table: %s\n",$fieldinfo->table);
printf("max. Len: %d\n",$fieldinfo->max_length);
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// Check connection
if (mysqli_connect_errno($con))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT Lastname,Age FROM Persons ORDER BY Lastname";
if ($result=mysqli_query($con,$sql))
{
// Get field information for "Age"
$fieldinfo=mysqli_fetch_field_direct($result,1);
printf("Name: %s\n",$fieldinfo->name);
printf("Table: %s\n",$fieldinfo->table);
printf("max. Len: %d\n",$fieldinfo->max_length);
// Free result set
mysqli_free_result($result);
}
mysqli_close($con);
?>
Definition and Usage
The mysqli_fetch_field_direct() function returns meta-data for a single field (column) in the result set, as an object.
Syntax
mysqli_fetch_field_direct(result,fieldnr);
| Parameter | Description |
|---|---|
| result | Required. Specifies a result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() |
| fieldnr | Required. Specifies the field number. Must be an integer between 0 and number of fields - 1 |
Technical Details
| Return Value: | Returns an object containing field definition information.
FALSE if no info is available. The object has the following properties:
|
|---|---|
| PHP Version: | 5+ |
PHP MySQLi Reference
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