홈피디자인닷컴 > PHP > PHP 함수 > mysqli_select

mysqli_select_db

(PHP 5)

mysqli_select_db

(no version information, might be only in CVS)

mysqli->select_db -- Selects the default database for database queries

Descript-xion

bool mysqli_select_db ( object link, string dbname)

The mysqli_select_db() function selects the default database (specified by the dbname parameter) to be used when performing queries against the database connection represented by the link parameter.

참고: This function should only be used to change the default database for the connection. You can select the default database with 4th parameter in mysqli_connect().

Return values

성공일 경우 TRUE를, 실패일 경우 FALSE를 반환합니다.

Example

예 1. Object oriented style

<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");

/* check connection */
if (mysqli_connect_errno()) {
   printf("Connect failed: %s\n", mysqli_connect_error());
   exit();
}

/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
   $row = $result->fetch_row();
   printf("Default database is %s.\n", $row[0]);
   $result->close();
}

/* change db to world db */
$mysqli->select_db("world");

/* return name of current default database */
if ($result = $mysqli->query("SELECT DATABASE()")) {
   $row = $result->fetch_row();
   printf("Default database is %s.\n", $row[0]);
   $result->close();
}

$mysqli->close();
?>

예 2. Procedural style

<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "test");

/* check connection */
if (mysqli_connect_errno()) {
   printf("Connect failed: %s\n", mysqli_connect_error());
   exit();
}

/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
   $row = mysqli_fetch_row($result);
   printf("Default database is %s.\n", $row[0]);
   mysqli_free_result($result);
}

/* change db to world db */
mysqli_select_db($link, "world");

/* return name of current default database */
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
   $row = mysqli_fetch_row($result);
   printf("Default database is %s.\n", $row[0]);
   mysqli_free_result($result);
}

mysqli_close($link);
?>

The above examples would produce the following output:

Default database is test.
Default database is world.

add a note User Contributed Notes
mysqli_select_db

miguel dot simoes at almadanet dot com
22-Sep-2004 01:02

When using Zend Compatibility Mode, you'll not be able to use MySQLi as you would like. Each time you try to create a new object you'll get:

"Fatal error: Trying to clone an uncloneable object of class mysqli in XXX".

In order to use the mysqli objects you'll need to deactivate Zend Compatibility mode before calling the connect procedure:

ini_set('zend.ze1_compatibility_mode', 0);
$mysqli = new mysqli(hostname,username,password,[database]);

** Issue happening under Unix and Windows OS.

mysqli_select_db

Descript-xion

Return values

See also

Example