mysql_db_query
(PHP 4, PHP 5, PECL mysql:1.0)
mysql_db_query — Send a MySQL query
說明
mysql_db_query() selects a database, and executes a query on it.
參數
- database
-
The name of the database that will be selected.
- query
-
The MySQL query.
- 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。
Return值
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.
更新日誌
| 版本 | 說明 |
|---|---|
| 4.0.6 | This function is deprecated, do not use this function. Use mysql_select_db() and mysql_query() instead. |
範例
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);
?>
註釋
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.