The mysqli_fetch_field_direct() function returns meta-data for a single column in the result set as an object.
mysqli_fetch_field_direct(result,fieldIndex);| Parameter | Is Required | Description |
|---|---|---|
| result | Required. | Result set returned by mysqli_query(), mysqli_store_result() or mysqli_use_result() |
| fieldIndex | Required. | Field index. Must be an integer between 0 and number_of_column - 1 |
It returns an object containing field definition information or FALSE if fails.
The returning object has the following properties.
| Property Name | Meaning |
|---|---|
| name | name of the column |
| orgname | original column name (if an alias is used) |
| table | name of table |
| orgtable | original table name (if an alias is used) |
| def | default value for this field |
| max_length | maximum width of field |
| length | width of field as specified in table definition |
| charsetnr | character set number for the field |
| flags | bit-flags for the field |
| type | data type used for the field |
| decimals | for integer fields; the number of decimals used |
The following code returns meta-data for a single column in the result set, then print the field's name, table, and max length.
<?php/* www. j ava 2 s . c o m*/
$con=mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno($con)){
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql="SELECT Lastname FROM Persons";
if ($result=mysqli_query($con,$sql)){
// Get field information for "Age"
$fieldinfo=mysqli_fetch_field_direct($result,1);
print $fieldinfo->name;
print $fieldinfo->table;
print $fieldinfo->max_length;
mysqli_free_result($result);
}
mysqli_close($con);
?>