mysql_ping
(PHP 4 >= 4.3.0, PHP 5)
mysql_ping — Ping a server connection or reconnect if there is no connection
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:
Description
$link_identifier = NULL
] )Checks whether or not the connection to the server is working. If it has gone down, an automatic reconnection is attempted. This function can be used by scripts that remain idle for a long while, to check whether or not the server has closed the connection and reconnect if necessary.
Note:
Automatic reconnection is disabled by default in versions of MySQL >= 5.0.3.
Parameters
-
link_identifier -
The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If no connection is found or established, an
E_WARNINGlevel error is generated.
Return Values
Returns TRUE if the connection to the server MySQL server is working,
otherwise FALSE.
Examples
Example #1 A mysql_ping() example
<?php
set_time_limit(0);
$conn = mysql_connect('localhost', 'mysqluser', 'mypass');
$db = mysql_select_db('mydb');
/* Assuming this query will take a long time */
$result = mysql_query($sql);
if (!$result) {
echo 'Query #1 failed, exiting.';
exit;
}
/* Make sure the connection is still alive, if not, try to reconnect */
if (!mysql_ping($conn)) {
echo 'Lost connection, exiting after query #1';
exit;
}
mysql_free_result($result);
/* So the connection is still alive, let's run another query */
$result2 = mysql_query($sql2);
?>
See Also
- mysql_thread_id() - Return the current thread ID
- mysql_list_processes() - List MySQL processes
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- MySQL Drivers and Plugins
- Оригинальное API MySQL
- mysql_affected_rows
- mysql_client_encoding
- mysql_close
- mysql_connect
- mysql_create_db
- mysql_data_seek
- mysql_db_name
- mysql_db_query
- mysql_drop_db
- mysql_errno
- mysql_error
- mysql_escape_string
- mysql_fetch_array
- mysql_fetch_assoc
- mysql_fetch_field
- mysql_fetch_lengths
- mysql_fetch_object
- mysql_fetch_row
- mysql_field_flags
- mysql_field_len
- mysql_field_name
- mysql_field_seek
- mysql_field_table
- mysql_field_type
- mysql_free_result
- mysql_get_client_info
- mysql_get_host_info
- mysql_get_proto_info
- mysql_get_server_info
- mysql_info
- mysql_insert_id
- mysql_list_dbs
- mysql_list_fields
- mysql_list_processes
- mysql_list_tables
- mysql_num_fields
- mysql_num_rows
- mysql_pconnect
- mysql_ping
- mysql_query
- mysql_real_escape_string
- mysql_result
- mysql_select_db
- mysql_set_charset
- mysql_stat
- mysql_tablename
- mysql_thread_id
- mysql_unbuffered_query
Коментарии
Is important to remember that if your first connection to mysql don't works, mysql_ping will always return true! So, if you want to check if mysql is connected, first of all you must check if mysql_connect do not returns false and then you can begin to check mysql_ping.It should be noted that mysql_ping() seems to reset the error message on the server.I used it to check whether the connection was still alive before reading the error message via mysql_error() and it always returned an empty string. Upon removing the connection check everything worked.
When using the mysql_ping command under php 5.1.2 and mysql 5.0, I was having problems with the auto-reconnect "feature", mainly that when the connection was severed, a mysql_ping would not automatically re-establish the connection to the database.
The connection to the DB is dropped when the time without a query excedes the wait_timeout value in my.cnf. You can check your wait_timeout by running the query "SHOW VARIABLES;"
If you're having problems auto-reconnecting when the connection is dropped, use this code:
<?php
$conn = mysql_connect('localhost','user','pass');
mysql_select_db('db',$conn);
if (!mysql_ping ($conn)) {
//here is the major trick, you have to close the connection (even though its not currently working) for it to recreate properly.
mysql_close($conn);
$conn = mysql_connect('localhost','user','pass');
mysql_select_db('db',$conn);
}
//run queries knowing that your connection is alive....
?>
When checking if a $resource works...be prepared that mysql_ping returns NULL as long as $resource is no correct mysql resource.
<?php
$resource =NULL;
var_dump = @mysql_ping($resource);
# showing NULL
?>
This could be used to decide of a current $resource is a mysql or a mysqli connection when nothing else is available to do that...
If you get 'error 2006: MySQL server has gone away' messages when running (really) long scripts, mysql_ping will help detecting the loss of the db-connection. This can happen, when 'wait timeout' is reached (MySQL default is 8 hours).mysql_ping() is really helpful when you have this annoying error:
MYSQL Error 2006 Server has gone away
For CI users:
In 1.7.2 version of codeigniter, there is a function
$this->db->reconnect()
that uses mysql_ping() to reestablish the timed out connection.
This function is specially useful when developing social media sites that uses hundreds of connections to the db such asinserting or selecting.
This function *does not* attempt to reconnect at this time. It only tells you whether or not you currently *are* connected.
To actually reconnect, you will have to implement this yourself in a wrapper class.