mysql_db_query
(PHP 4, PHP 5)
mysql_db_query — Selects a database and executes a query on it
This function was deprecated in PHP 5.3.0, and it and the entire original MySQL extension was removed in PHP 7.0.0. Instead, use either the actively developed MySQLi or PDO_MySQL extensions. See also the MySQL: choosing an API guide. Alternatives to this function include:
- mysqli_select_db() then the query
- PDO::__construct()
Descrizione
mysql_db_query() selects a database, and executes a query on it.
Elenco dei parametri
-
database -
The name of the database that will be selected.
-
query -
The MySQL query.
Data inside the query should be properly escaped.
-
link_identifier -
La connessione MySQL. Se l'identificativo di connessione non è specificato, l'ultima connessione aperta da mysql_connect() viene assunta. Se questa connessione non è trovata, si cercherà di crearne una come se mysql_connect() fosse stata chiamata senza argomenti. Se una connessione non è trovata oppure non viene stabilita, un avviso di livello
E_WARNINGviene generato.
Valori restituiti
Returns a positive MySQL result resource to the query result,
or false on error. The function also returns true/false for
INSERT/UPDATE/DELETE
queries to indicate success/failure.
Esempi
Example #1 mysql_db_query() alternative example
<?php
if (!$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')) {
echo 'Could not connect to mysql';
exit;
}
if (!mysql_select_db('mysql_dbname', $link)) {
echo 'Could not select database';
exit;
}
$sql = 'SELECT foo FROM bar WHERE id = 42';
$result = mysql_query($sql, $link);
if (!$result) {
echo "DB Error, could not query the database\n";
echo 'MySQL Error: ' . mysql_error();
exit;
}
while ($row = mysql_fetch_assoc($result)) {
echo $row['foo'];
}
mysql_free_result($result);
?>Note
Nota:
Be aware that this function does NOT switch back to the database you were connected before. In other words, you can't use this function to temporarily run a sql query on another database, you would have to manually switch back. Users are strongly encouraged to use the
database.tablesyntax in their sql queries or mysql_select_db() instead of this function.
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