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# mysqli::select_db

# mysqli_select_db

(PHP 5)

mysqli::select_db -- mysqli_select_db — Selects the default database for database queries

### 설명

Object oriented style (method):

bool mysqli::select_db ( string `$dbname` )

Procedural style:

bool mysqli_select_db ( mysqli `$link` , string `$dbname` )

Selects the default database to be used when performing queries against the database connection.

> Note: 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().

### 인수

`link`

  순차 형식 전용: mysqli_connect()나 mysqli_init()가 반환한 연결 식별자.

`dbname`

  The database name.

### 반환값

성공할 경우 `TRUE`를, 실패할 경우 `FALSE`를 반환합니다.

### 예제

Example #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();
?>`

Example #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);
?>`

위 예제의 출력:

    Default database is test.
    Default database is world.

### 참고

- mysqli_connect() - Open a new connection to the MySQL server
- mysqli_real_connect() - Opens a connection to a mysql server

mysqli::rollback
mysqli::set_charset
MySQLi
PHP Manual