PHP mysql_fetch_field() Function
 Complete PHP MySQL Reference
Definition and Usage
The mysql_fetch_field() function returns an object containing information of
a field from a recordset.
This function gets field data from the mysql_query() function and returns an
object on success, or FALSE on failure or
when there are no more
rows.
Possible return values:
- name - Field name
- table - The table the field belongs to
- def - Default value for the field
- max_length - Maximum field length
- not_null - 1 if the field cannot be NULL
- primary_key - 1 if the field is a primary key
- unique_key - 1 if the field is a unique key
- multiple_key - 1 if the field is a non-unique key
- numeric - 1 if the field is numeric
- blob - 1 if the field is a BLOB
- type - Field type
- unsigned - 1 if the field is unsigned
- zerofill - 1 if the field is zero-filled
Syntax
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mysql_fetch_field(data,field_offset)
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| Parameter |
Description |
| data |
Required. Specifies which data pointer to use. The data
pointer is the result from the mysql_query() function |
| field_offset |
Optional. Specifies which field to start returning.
0 indicates the first field. If this parameter is not set, it
will retrieve the next field |
Tips and Notes
Note: Each subsequent call to mysql_fetch_field() returns the next
field in the recordset.
Example
<?php
$con = mysql_connect("localhost", "peter", "abc123");
if (!$con)
{
die('Could not connect: ' . mysql_error());
}
$db_selected = mysql_select_db("test_db",$con);
$sql = "SELECT * from Person";
$result = mysql_query($sql,$con);
while ($property = mysql_fetch_field($result))
{
echo "Field name: " . $property->name . "<br />";
echo "Table name: " . $property->table . "<br />";
echo "Default value: " . $property->def . "<br />";
echo "Max length: " . $property->max_length . "<br />";
echo "Not NULL: " . $property->not_null . "<br />";
echo "Primary Key: " . $property->primary_key . "<br />";
echo "Unique Key: " . $property->unique_key . "<br />";
echo "Mutliple Key: " . $property->multiple_key . "<br />";
echo "Numeric Field: " . $property->numeric . "<br />";
echo "BLOB: " . $property->blob . "<br />";
echo "Field Type: " . $property->type . "<br />";
echo "Unsigned: " . $property->unsigned . "<br />";
echo "Zero-filled: " . $property->zerofill . "<br /><br />";
}
mysql_close($con);
?>
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The output of the code above could be:
Field name: LastName
Table name: Person
Default value:
Max length: 8
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 0
BLOB: 0
Field Type: string
Unsigned: 0
Zero-filled: 0
Field name: FirstName
Table name: Person
Default value:
Max length: 7
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 0
BLOB: 0
Field Type: string
Unsigned: 0
Zero-filled: 0
Field name: Address
Table name: Person
Default value:
Max length: 9
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 0
BLOB: 0
Field Type: string
Unsigned: 0
Zero-filled: 0
Field name: Age
Table name: Person
Default value:
Max length: 2
Not NULL: 0
Primary Key: 0
Unique Key: 0
Mutliple Key: 0
Numeric Field: 1
BLOB: 0
Field Type: int
Unsigned: 0
Zero-filled: 0
|
Complete PHP MySQL Reference
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