mysqli::savepoint
In some situations its useful to use this function for changing databases in general. We've tested it in production environment and it seams to be faster with switching databases than creating new connections.
mysqli::select_db
mysqli_select_db
(PHP 5)
mysqli::select_db -- mysqli_select_db — Selects the default database for database queries
Descrição
Estilo orientado à objeto
bool mysqli::select_db
( string
$dbname
)Estilo procedural
Selects the default database to be used when performing queries against the database connection.
Nota:
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().
Parâmetros
-
link -
Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()
-
dbname -
The database name.
Valor Retornado
Retorna TRUE em caso de sucesso ou FALSE em caso de falha.
Exemplos
Exemplo #1 mysqli::select_db() example
Estilo orientado à objeto
<?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();
?>
Estilo procedural
<?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);
?>
Os exemplos acima irão imprimir:
Default database is test. Default database is world.
Veja Também
- mysqli_connect() - Sinônimo de mysqli::__construct
- mysqli_real_connect() - Opens a connection to a mysql server
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User Contributed Notes
mysqli::select_db - [1 notes]
pjasiulewicz at gmail dot com ¶
2 years ago