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Last updated: Sat, 27 Jan 2007

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# mysqli_fetch_fields

(PHP 5)

mysqli_fetch_fields

(no version information, might be only in CVS)

result->fetch_fields -- Returns an array of objects representing the fields in a result set

## Description

Procedural Style:

array mysqli_fetch_fields ( mysqli_result result )

Object oriented style (method):

class mysqli_result {
array fetch_fields ( void )
}

This function serves an identical purpose to the mysqli_fetch_field() function with the single difference that, instead of returning one object at a time for each field, the columns are returned as an array of objects.

## Возвращаемые значения

Returns an array of objects 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() и mysqli_fetch_field_direct().

## 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 */
$finfo = $result->fetch_fields();
foreach ($finfo as $val) {
printf("Name: %s\n", $val->name);
printf("Table: %s\n", $val->table);
printf("max. Len: %d\n", $val->max_length);
printf("Flags: %d\n", $val->flags);
printf("Type: %d\n\n", $val->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 columns */
$finfo = mysqli_fetch_fields($result);
foreach ($finfo as $val) {
printf("Name: %s\n", $val->name);
printf("Table: %s\n", $val->table);
printf("max. Len: %d\n", $val->max_length);
printf("Flags: %d\n", $val->flags);
printf("Type: %d\n\n", $val->type);
}
mysqli_free_result($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_fields
Rob
09-Mar-2007 08:24
`"max_length: The maximum width of the field for the result set."
Not a native English speaker, I could be reading this wrong, but the max_length property doesn't reflect the maximum length of a field but returns the current length of the contents of a field (something that can easily be derived using the strlen() function):
mysql> describe domains;
+--------------+--------------+
| Field | Type |
+--------------+--------------+
...
| name | varchar(255) |
...
$info = $query->fetch_fields();
foreach ($info as $value)
print "[max_length] ".$value->max_length."\n";
This results in:
[max_length] 14
The number of characters in this field actually is 14, but the maximum length of the field is 255.`
Jonathan
07-Mar-2007 02:12
`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] = "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";
?>`
add a note
mysqli_fetch_lengths mysqli_fetch_field

Last updated: Sat, 27 Jan 2007
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