mysql_db_query

(PHP 4, PHP 5)

mysql_db_querySelects a database and executes a query on it

Avviso

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:

Descrizione

mysql_db_query(string $database, string $query, resource $link_identifier = NULL): resource|bool

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_WARNING viene 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.table syntax in their sql queries or mysql_select_db() instead of this function.

Vedere anche:

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