mysqli::select_db
mysqli_select_db
Selects the default database for database queries
Description
Object-oriented style
public bool mysqli::select_db(string $database)
bool mysqli_select_db(mysqli $mysql, string $database)
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.
Parameters
-
mysql
-
Procedural style only: A mysqli object
returned by mysqli_connect or mysqli_init
-
database
-
The database name.
Return Values
Returns true on success or false on failure.
Errors/Exceptions
If mysqli error reporting is enabled (MYSQLI_REPORT_ERROR) and the requested operation fails,
a warning is generated. If, in addition, the mode is set to MYSQLI_REPORT_STRICT,
a mysqli_sql_exception is thrown instead.
Examples
Example #1 mysqli::select_db example
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* get the name of the current default database */
$result = $mysqli->query("SELECT DATABASE()");
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
/* change default database to "world" */
$mysqli->select_db("world");
/* get the name of the current default database */
$result = $mysqli->query("SELECT DATABASE()");
$row = $result->fetch_row();
printf("Default database is %s.\n", $row[0]);
<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* get the name of the current default database */
$result = mysqli_query($link, "SELECT DATABASE()");
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
/* change default database to "world" */
mysqli_select_db($link, "world");
/* get the name of the current default database */
$result = mysqli_query($link, "SELECT DATABASE()");
$row = mysqli_fetch_row($result);
printf("Default database is %s.\n", $row[0]);
The above examples will output:
Default database is test.
Default database is world.
See Also
- mysqli_connect
- mysqli_real_connect