field_seek()
PHP mysqli field_seek() funksiyasi
Misol - obyektga yo‘naltirilgan uslub
Maydon kursorini natijalar to‘plamidagi ikkinchi ustunga ("Age") o‘rnating, fetch_field() yordamida maydon ma’lumotlarini oling, so‘ng maydonning nomi, jadvali va maksimal uzunligini chiqaring:
<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");
if ($mysqli -> connect_errno) {
echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
exit();
}
$sql = "SELECT Lastname, Age FROM Persons ORDER BY Lastname";
if ($result = $mysqli -> query($sql)) {
// Get field information for second column
$result = field_seek(1);
$fieldinfo = $result -> fetch_field();
printf("Name: %s\n", $fieldinfo -> name);
printf("Table: %s\n", $fieldinfo -> table);
printf("Max. Len: %d\n", $fieldinfo -> max_length);
$result -> free_result();
}
$mysqli -> close();
?>
Protsedural uslubdagi misolni sahifa pastida ko‘ring.
Ta’rif va qo‘llanilishi
field_seek() / mysqli_field_seek() funksiyasi maydon kursorini berilgan maydon siljishiga (offset) o‘rnatadi.
Sintaksis
Obyektga yo‘naltirilgan uslub:
$mysqli_result -> field_seek(fieldnr)
Protsedurali uslub:
mysqli_field_seek(result, fieldnr)
Parametr qiymatlari
| Parametr | Tavsif |
|---|---|
| result | Majburiy. mysqli_query(), mysqli_store_result() yoki mysqli_use_result() qaytargan natijalar to‘plami identifikatorini belgilaydi |
| fieldnr | Majburiy. Maydon raqamini belgilaydi. 0 dan maydonlar soni-1 gacha bo‘lgan butun son bo‘lishi shart |
Texnik tafsilotlar
| Qaytariladigan qiymat: | Muvaffaqiyatli bo‘lsa TRUE. Muvaffaqiyatsiz bo‘lsa FALSE |
|---|---|
| PHP versiyasi: | 5+ |
Misol - protsedural uslub
Maydon kursorini natijalar to‘plamidagi ikkinchi ustunga ("Age") o‘rnating, mysqli_fetch_field() yordamida maydon ma’lumotlarini oling, so‘ng maydonning nomi, jadvali va maksimal uzunligini chiqaring:
<?php
$con = mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit();
}
$sql="SELECT Lastname, Age FROM Persons ORDER BY Lastname";
if ($result = mysqli_query($con,$sql)) {
// Get field information for second column
mysqli_field_seek($result, 1);
$fieldinfo = mysqli_fetch_field($result);
printf("Name: %s\n", $fieldinfo -> name);
printf("Table: %s\n", $fieldinfo -> table);
printf("max. Len: %d\n", $fieldinfo -> max_length);
mysqli_free_result($result);
}
mysqli_close($con);
?>
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