(PHP 4, PHP 5)
mysql_db_query — Selects a database and executes a query on it
This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include:
$database
, string $query
[, resource $link_identifier
= NULL
] )mysql_db_query() selects a database, and executes a query on it.
自 PHP 5.3.0 起,已經廢棄此函式。強烈建議不要使用此函式。
database
The name of the database that will be selected.
query
The MySQL query.
Data inside the query should be properly escaped.
link_identifier
MySQL 的連接識別符。如果沒有指定,預設使用最後被
mysql_connect() 打開的連接。如果沒有找到該連接,函式會嘗試呼叫
mysql_connect() 建立連接並使用它。如果發生意外,沒有找到連接或無法建立連接,系統發出
E_WARNING
級別的警告信息。
Returns a positive MySQL result resource to the query result,
or FALSE
on error. The function also returns TRUE
/FALSE
for
INSERT/UPDATE/DELETE
queries to indicate success/failure.
版本 | 說明 |
---|---|
5.3.0 | This function now throws an E_DEPRECATED notice. |
Example #1 mysql_db_query() alternative example
<?php
if (!$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:
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.