select_db()
PHP mysqli select_db() funksiyasi
Misol - obyektga yo‘naltirilgan uslub
Ulanish uchun standart ma’lumotlar bazasini o‘zgartiring:
<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");
if ($mysqli -> connect_errno) {
echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
exit();
}
// Return name of current default database
if ($result = $mysqli -> query("SELECT DATABASE()")) {
$row = $result -> fetch_row();
echo "Default database is " . $row[0];
$result -> close();
}
// Change db to "test" db
$mysqli -> select_db("test");
// Return name of current default database
if ($result = $mysqli -> query("SELECT DATABASE()")) {
$row = $result -> fetch_row();
echo "Default database is " . $row[0];
$result -> close();
}
$mysqli -> close();
?>
Protsedural uslubdagi misolni sahifa pastida ko‘ring.
Ta’rif va qo‘llanilishi
select_db() / mysqli_select_db() funksiyasi ulanish uchun standart ma’lumotlar bazasini o‘zgartirish uchun ishlatiladi.
Sintaksis
Obyektga yo‘naltirilgan uslub:
$mysqli -> select_db(name)
Protsedurali uslub:
mysqli_select_db(connection, name)
Parametr qiymatlari
| Parametr | Tavsif |
|---|---|
| connection | Majburiy. Foydalaniladigan MySQL ulanishini belgilaydi |
| name | Majburiy. Ma’lumotlar bazasi nomini belgilaydi |
Texnik tafsilotlar
| Qaytariladigan qiymat: | Muvaffaqiyatli bo‘lsa TRUE. Muvaffaqiyatsiz bo‘lsa FALSE |
|---|---|
| PHP versiyasi: | 5+ |
Misol - protsedural uslub
Ulanish uchun standart ma’lumotlar bazasini o‘zgartiring:
<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
exit;
}
// Return name of current default database
if ($result = mysqli_query($con, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
echo "Default database is " . $row[0];
mysqli_free_result($result);
}
// Change db to "test" db
mysqli_select_db($con, "test");
// Return name of current default database
if ($result = mysqli_query($con, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
echo "Default database is " . $row[0];
mysqli_free_result($result);
}
// Close connection
mysqli_close($con);
?>
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