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Last updated: Sat, 27 Jan 2007

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# 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:

object mysqli_fetch_field ( mysqli_result result )

Object oriented style (method):

class mysqli_result {
object 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.

## Возвращаемые значения

Returns an object which contains field definition information or `FALSE` if no field information is available.

Таблица 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.
length | The width of the field, as specified in the table definition.
charsetnr | The character set number for the field.
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)

## Смотрите также

mysqli_num_fields(), mysqli_fetch_field_direct(), mysqli_fetch_fields() и mysqli_field_seek().

## Примеры

Пример 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();
?>`

Пример 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);
?>`

Результат выполнения данного примера:

    Name:     Name
    Table:    Country
    max. Len: 11
    Flags:    1
    Type:     254

    Name:     SurfaceArea
    Table:    Country
    max. Len: 10
    Flags:    32769
    Type:     4

add a note User Contributed Notes
mysqli_fetch_field
Jonathan
06-Mar-2007 03:43
`Some corrections ;o)
$mysqli_type = array();
$mysqli_type[0] = "DECIMAL";
$mysqli_type[1] = "TINYINT";
$mysqli_type[2] = "SMALLINT";
$mysqli_type[3] = "INTEGER";
$mysqli_type[4] = "FLOAT";
$mysqli_type[5] = "DOUBLE";
$mysqli_type[7] = "TIMESTAMP";
$mysqli_type[8] = "BIGINT";
$mysqli_type[9] = "MEDIUMINT";
$mysqli_type[10] = "DATE";
$mysqli_type[11] = "TIME";
$mysqli_type[12] = "DATETIME";
$mysqli_type[13] = "YEAR";
$mysqli_type[14] = "DATE";
$mysqli_type[16] = "BIT";
$mysqli_type[246] = "DECIMAL";
$mysqli_type[247] = "ENUM";
$mysqli_type[248] = "SET";
$mysqli_type[249] = "TINYBLOB";
$mysqli_type[250] = "MEDIUMBLOB";
$mysqli_type[251] = "LONGBLOB";
$mysqli_type[252] = "BLOB";
$mysqli_type[253] = "VARCHAR";
$mysqli_type[254] = "CHAR";
$mysqli_type[255] = "GEOMETRY";`
dedlfix
18-Jul-2006 10:26
`There are MYSQLI_TYPE_* constants for the type property (listed in http://php.net/manual/en/ref.mysqli.php).
e.g.
<?php
if ($finfo->type == MYSQLI_TYPE_VAR_STRING)
// a VARCHAR`
jakerosoft at hotmail dot com
16-Aug-2005 09:15
`<?
$fieldinfo = $result->fetch_field();
if ($fieldinfo & MYSQLI_NOT_NULL_FLAG) {
print "not null flag is set";
} else {
print "not null flag is NOT set";
}
?>`
Marc-Andr�
07-Jul-2005 03:56
`The "type" property will return a numerical representation of a field type instead of a "meaningful" string.
Here is an array that may help you:
<?php
$mysqli_type = array();
$mysqli_type[0] = "decimal";
$mysqli_type[1] = "tinyint";
$mysqli_type[2] = "smallint";
$mysqli_type[3] = "int";
$mysqli_type[4] = "float";
$mysqli_type[5] = "double";
$mysqli_type[7] = "timestamp";
$mysqli_type[8] = "bigint";
$mysqli_type[9] = "mediumint";
$mysqli_type[10] = "date";
$mysqli_type[11] = "time";
$mysqli_type[12] = "datetime";
$mysqli_type[13] = "year";
$mysqli_type[252] = "blob"; // text, blob, tinyblob,mediumblob, etc...
$mysqli_type[253] = "string"; // varchar and char
$mysqli_type[254] = "enum";
?>`
add a note
mysqli_fetch_fields mysqli_fetch_field_direct

Last updated: Sat, 27 Jan 2007
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