mysqli_result::fetch_field_direct
The constants for the TYPE number returned by fetch_field are enumerated here (MYSQLI_TYPE_*):
http://php.net/manual/en/mysqli.constants.php
mysqli_result::fetch_field
mysqli_fetch_field
(PHP 5)
mysqli_result::fetch_field -- mysqli_fetch_field — Returns the next field in the result set
설명
객체 기반 형식
object mysqli_result::fetch_field
( void
)
절차식 형식
object mysqli_fetch_field
( mysqli_result $result
)
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.
반환값
Returns an object which contains field definition information or FALSE if no field information is available.
| 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 | Reserved for default value, currently always "" |
| db | Database (since PHP 5.3.6) |
| catalog | The catalog name, always "def" (since PHP 5.3.6) |
| 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) |
예제
Example #1 객체 기반 형식
<?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();
?>
Example #2 절차식 형식
<?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);
?>
위 예제들의 출력:
Name: Name Table: Country max. Len: 11 Flags: 1 Type: 254 Name: SurfaceArea Table: Country max. Len: 10 Flags: 32769 Type: 4
참고
- mysqli_num_fields() - Get the number of fields in a result
- mysqli_fetch_field_direct() - Fetch meta-data for a single field
- mysqli_fetch_fields() - Returns an array of objects representing the fields in a result set
- mysqli_field_seek() - Set result pointer to a specified field offset
add a note
User Contributed Notes
mysqli_result::fetch_field
Anonymous
16-Feb-2012 08:20
iansoko at hotmail dot com
06-Oct-2011 08:24
here are the data types that correspond to the TYPE number returned by fetch_field.
thought i would post this here since i couldn't find the info elsewhere.
numerics
-------------
BIT: 16
TINYINT: 1
BOOL: 1
SMALLINT: 2
MEDIUMINT: 9
INTEGER: 3
BIGINT: 8
SERIAL: 8
FLOAT: 4
DOUBLE: 5
DECIMAL: 246
NUMERIC: 246
FIXED: 246
dates
------------
DATE: 10
DATETIME: 12
TIMESTAMP: 7
TIME: 11
YEAR: 13
strings & binary
------------
CHAR: 254
VARCHAR: 253
ENUM: 254
SET: 254
BINARY: 254
VARBINARY: 253
TINYBLOB: 252
BLOB: 252
MEDIUMBLOB: 252
TINYTEXT: 252
TEXT: 252
MEDIUMTEXT: 252
LONGTEXT: 252
ragtag at hotmail dot com
17-Sep-2008 05:16
The flags used by MySql are:
NOT_NULL_FLAG = 1
PRI_KEY_FLAG = 2
UNIQUE_KEY_FLAG = 4
BLOB_FLAG = 16
UNSIGNED_FLAG = 32
ZEROFILL_FLAG = 64
BINARY_FLAG = 128
ENUM_FLAG = 256
AUTO_INCREMENT_FLAG = 512
TIMESTAMP_FLAG = 1024
SET_FLAG = 2048
NUM_FLAG = 32768
PART_KEY_FLAG = 16384
GROUP_FLAG = 32768
UNIQUE_FLAG = 65536
To test if a flag is set you can use & like so:
<?php
$meta = $mysqli_result_object->fetch_field();
if ($meta->flags & 4) {
echo 'Unique key flag is set';
}
?>