How to use Redis in php? - php

I installed redis 2.8.12 and configured phpredis. Then I called redis instance in php class. But there is no result, can you help me?
public function __construct() {
try {
echo ':) ';
$newRedis = new Redis();
echo ':P ';
}
catch (Exception $e) {
echo $e -> getMessage();
}
}
this printed :), not printed :P

Did you check if your php redis module is loaded by checking in phpinfo() ? Also, if your redis server is running properly and on which port and if configured using password you are supplying same while initiating the connection ?

You can try to use RedisException class to debug your redis connection.
try{
if( $socket = fsockopen( $host, $port, $errorNo, $errorStr )){
if( $errorNo ){
throw new RedisException(“Socket cannot be opened”);
}
}
}catch( Exception $e ){
echo $e -> getMessage( );
}
I will elaborate on the answer once you are able to give an exception or an error.

Related

Laravel not running try catch block

Ive run into a little issue.
Im calling a method using the following
$this->testConnection($request->all());
The method looks like so
private function testConnection($data)
{
try {
$conn = ftp_connect($data['host']);
if (false === $conn) {
throw new Exception('Cant connect');
}
} catch (\Exception $e) {
return redirect()->route('create')->withInput()->withErrors($e->getMessage());
}
}
Update: It seems the ftp_connect PHP function isn't working and its not returning any errors
Im using Laravel 5.3
Any help would be grand.
Cheers,
The solution to this was that i was missing
use Exception;

redis connection inside infinite loop

I'm creating a redis connection using phpredis client
$redis = new Redis();
$redis->pconnect(loclahost, 6336, 2) ;
$redis->select(15);
Now I used the $redis object inside an infinite loop.
while(true){
///using redis connection object.
}
Around 54 such individual processes were running but once or twice in a day I get an error like "read error on connection".
Please help me to fix it.
I would think something like this would work. NOTE I have not tested this, and I have not written PHP in a pretty long time.
function redisConnection() {
try {
$redis = new Redis()
$redis->pconnect(localhost, 6336, 2);
$redis->select(15);
$redis->ping();
return $redis;
} catch (Exception $e) {
throw new Exception("Can not connect: " . $e->getMessage());
}
}
$redis = redisConnection();
while (true) {
try {
$redis->ping();
} catch {
$redis = redisConnection();
}
// Rest of code
}

Codeigniter/PHP check if can connect to database

I'd like to backup my read replica(i.e., slave) database with my master database but this simple boolean I did failed:
$config['hostname'] = "myReadReplicaDatabase.com";
//...$config['other_stuff']; other config stuff...
$db_obj=$CI->load->database($config, TRUE);
if(!$db_obj){
$config['hostname'] = "myMasterDatabase.com";
$db_obj=$CI->load->database($config, TRUE);
}
After terminating my read replica database I expected the boolean to evaluate to FALSE and the script to then use my master database. Unfortunately, instead I got the following PHP error:
Unable to connect to your database server using the provided settings.
Filename: core/Loader.php
All i want is for the connection to return true or false, does anyone know how to do this in Codeigniter?
My question was answered on this thread on Codeigniter forums.
The key is to not autoinitialize the database:
$db['xxx']['autoinit'] = FALSE;
To suppress errors it you can set this
$db['xxx']['db_debug'] = FALSE;
Then in your code that checks the db state, check TRUE/FALSE of the initialize() function:
$db_obj = $this->database->load('xxx',TRUE);
$connected = $db_obj->initialize();
if (!$connected) {
$db_obj = $this->database->load('yyy',TRUE);
}
Here is my entire config file for future reference: https://gist.github.com/3749863.
when you connect to database its returns connection object with connection id on successful condition otherwise return false.
you can check it to make sure that database connection is done or not.
$db_obj=$CI->load->database($config, TRUE);
if($db_obj->conn_id) {
//do something
} else {
echo 'Unable to connect with database with given db details.';
}
try this and let me know, if you have any other issue.
I test all I found and nothing wokrs, the only way I found was with dbutil checking if database exists, something like this:
$this->load->database();
$this->load->dbutil();
// check connection details
if( !$this->dbutil->database_exists('myDatabase'))
echo 'Not connected to a database, or database not exists';
Based on what was said here:
Codeigniter switch to secondary database if primary is down
You can check for the conn_id on the $db_obj
if ($db_obj->conn_id === false) {
$config['db_debug'] = true;
$config['hostname'] = "myMasterDatabase.com";
$db_obj=$CI->load->database($config, TRUE);
}
This should work.
try {
// do database connection
} catch (Exception $e) {
// DO whatever you want with the $e data, it has a default __toString() so just echo $e if you want errors or default it to connect another db, etc.
echo $e->getMessage();
// Connect to secondary DB.
}
For those who downvoted me, you can do this. Exception will catch PDOException.
try {
$pdo = new PDO($dsn, $username, $password);
} catch(PDOException $e) {
mail('webmaster#example.com', 'Database error message', $e->getMessage());
// and finally... attempt your second DB connection.
exit;
}
$readReplica = #$CI->load->database($config, TRUE); // ommit the error
if ($readReplica->call_function('error') !== 0) {
// Failed to connect
}
Im not sure about the error code (not sure if its int/string) and don't have CI nearby to test this out but this principle should work
$this->load->database();
print_r($this->db);
Its work for me
$config['xxx'] = xx;
...
$config['db_debug'] = false;
$db_obj = #$this->load->database($config,true);
if(!#$db_obj->initialize()){
echo "Unable to connect database";
die;
}

PHP SQLite3 error?

How do I know if there's an error if I did $db = new SQLite3("somedb.db"); in PHP? Right now the $db doesn't really give me any sort of error?
I can check for file existance, but I'm unsure if there could be any other errors when I open a connection.
You should enable exceptions and instantiate in a try-catch block.
It is not obvious from the documentation but if you use the constructor to open the database it will throw an exception on error.
Further if you set the flag SQLITE3_OPEN_READWRITE in the second argument then it will also throw an exception when the database does not exist (rather than creating it).
class Database extends SQLite3
{
function __construct($dbName)
{
$this->enableExceptions(true);
try
{
parent::__construct($dbName, SQLITE3_OPEN_READWRITE );
}
catch(Exception $ex) { die( $ex->getMessage() ); }
}
Try:
echo $db->lastErrorMsg();

PDO: MySQL server has gone away

I have a script that does a lot of legwork nightly.
It uses a PDO prepared statement that executes in a loop.
The first few are running fine, but then I get to a point where they all fail with the error:
"MySQL server has gone away".
We run MySQL 5.0.77.
PHP Version 5.2.12
The rest of the site runs fine.
Most likely you sent a packet to the server that is longer than the maximum allowed packet.
When you try to insert a BLOB that exceeds your server's maximum packet size, even on a local server you will see the following error message on clientside:
MySQL server has gone away
And the following error message in the server log: (if error logging is enabled)
Error 1153 Got a packet bigger than 'max_allowed_packet' bytes
To fix this, you need to decide what is the size of the largest BLOB that you will ever insert, and set max_allowed_packet in my.ini accordingly, for example:
[mysqld]
...
max_allowed_packet = 200M
...
The B.5.2.9. MySQL server has gone away section of the MySQL manual has a list of possible causes for this error.
Maybe you are in one of those situations ? -- Especially considering you are running a long operation, the point about wait_timeout might be interesting...
I had the same problem where the hosting server administration kills connection if there is a timeout.
Since I have used the query in major part I wrote a code which instead of using PDO class we can include the below class and replace the classname to "ConnectionManagerPDO". I just wrapped the PDO class.
final class ConnectionManagerPDO
{
private $dsn;
private $username;
private $passwd;
private $options;
private $db;
private $shouldReconnect;
const RETRY_ATTEMPTS = 3;
public function __construct($dsn, $username, $passwd, $options = array())
{
$this->dsn = $dsn;
$this->username = $username;
$this->passwd = $passwd;
$this->options = $options;
$this->shouldReconnect = true;
try {
$this->connect();
} catch (PDOException $e) {
throw $e;
}
}
/**
* #param $method
* #param $args
* #return mixed
* #throws Exception
* #throws PDOException
*/
public function __call($method, $args)
{
$has_gone_away = false;
$retry_attempt = 0;
try_again:
try {
if (is_callable(array($this->db, $method))) {
return call_user_func_array(array($this->db, $method), $args);
} else {
trigger_error("Call to undefined method '{$method}'");
/*
* or
*
* throw new Exception("Call to undefined method.");
*
*/
}
} catch (\PDOException $e) {
$exception_message = $e->getMessage();
if (
($this->shouldReconnect)
&& strpos($exception_message, 'server has gone away') !== false
&& $retry_attempt <= self::RETRY_ATTEMPTS
) {
$has_gone_away = true;
} else {
/*
* What are you going to do with it... Throw it back.. FIRE IN THE HOLE
*/
throw $e;
}
}
if ($has_gone_away) {
$retry_attempt++;
$this->reconnect();
goto try_again;
}
}
/**
* Connects to DB
*/
private function connect()
{
$this->db = new PDO($this->dsn, $this->username, $this->passwd, $this->options);
/*
* I am manually setting to catch error as exception so that the connection lost can be handled.
*/
$this->db->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
}
/**
* Reconnects to DB
*/
private function reconnect()
{
$this->db = null;
$this->connect();
}
}
Then use can start using the above class as you do in PDO.
try {
$db = new ConnectionManagerPDO("mysql:host=localhost;dbname=dummy_test", "root", "");
$query = $db->query("select * from test");
$query->setFetchMode(PDO::FETCH_ASSOC);
}
catch(PDOException $e){
/*
handle the exception throw in ConnectionManagerPDO
*/
}
Try using PDO::setAttribute(PDO::ATTR_EMULATE_PREPARES, true) on your pod instance(s). Dont know that it will help but with no log data its all i got.
It's likely that either your connection has been killed (e.g. by wait_timeout or another thread issuing a KILL command), the server has crashed or you've violated the mysql protocol in some way.
The latter is likely to be a bug in PDO, which is extremely likely if you're using server-side prepared statements or multi-results (hint: Don't)
A server crash will need to be investigated; look at the server logs.
If you still don't know what's going on, use a network packet dumper (e.g. tcpdump) to dump out the contents of the connection.
You can also enable the general query log - but do it very carefully in production.
Nathan H, below is php class for pdo reconnection + code usage sample.
Screenshot is attached.
<?php
# set errors reporting level
error_reporting(E_ALL ^ E_NOTICE ^ E_WARNING);
# set pdo connection
include('db.connection.pdo.php');
/* # this is "db.connection.pdo.php" content
define('DB_HOST', 'localhost');
define('DB_NAME', '');
define('DB_USER', '');
define('DB_PWD', '');
define('DB_PREFIX', '');
define('DB_SHOW_ERRORS', 1);
# connect to db
try {
$dbh = new PDO('mysql:host='.DB_HOST.';dbname='.DB_NAME, DB_USER, DB_PWD);
$dbh->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, TRUE);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e) {
# echo $e->getMessage()."<br />";
# exit;
exit("Site is temporary unavailable."); #
}
*/
$reconnection = new PDOReconnection($dbh);
$reconnection->getTimeout();
echo $dbh->query('select 1')->fetchColumn();
echo PHP_EOL;
echo 'sleep 10 seconds..'.PHP_EOL;
sleep(10);
$dbh = $reconnection->checkConnection();
echo $dbh->query('select 1')->fetchColumn();
echo PHP_EOL;
echo 'sleep 35 seconds..'.PHP_EOL;
sleep(35);
$dbh = $reconnection->checkConnection();
echo $dbh->query('select 1')->fetchColumn();
echo PHP_EOL;
echo 'sleep 55 seconds..'.PHP_EOL;
sleep(55);
$dbh = $reconnection->checkConnection();
echo $dbh->query('select 1')->fetchColumn();
echo PHP_EOL;
echo 'sleep 300 seconds..'.PHP_EOL;
sleep(300);
$dbh = $reconnection->checkConnection();
echo $dbh->query('select 1')->fetchColumn();
echo PHP_EOL;
# *************************************************************************************************
# Class for PDO reconnection
class PDOReconnection
{
private $dbh;
# constructor
public function __construct($dbh)
{
$this->dbh = $dbh;
}
# *************************************************************************************************
# get mysql variable "wait_timeout" value
public function getTimeout()
{
$timeout = $this->dbh->query('show variables like "wait_timeout"')->fetch(); # print_r($timeout);
echo '========================'.PHP_EOL.'mysql variable "wait_timeout": '.$timeout['Value'].' seconds.'.PHP_EOL.'========================'.PHP_EOL;
}
# *************************************************************************************************
# check mysql connection
public function checkConnection()
{
try {
$this->dbh->query('select 1')->fetchColumn();
echo 'old connection works..'.PHP_EOL.'========================'.PHP_EOL;
} catch (PDOException $Exception) {
# echo 'there is no connection.'.PHP_EOL;
$this->dbh = $this->reconnect();
echo 'connection was lost, reconnect..'.PHP_EOL.'========================'.PHP_EOL;
}
return $this->dbh;
}
# *************************************************************************************************
# reconnect to mysql
public function reconnect()
{
$dbh = new PDO('mysql:host=' . DB_HOST . ';dbname=' . DB_NAME, DB_USER, DB_PWD);
$dbh->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
$dbh->setAttribute(PDO::ATTR_EMULATE_PREPARES, TRUE);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
return $dbh;
}
}
# /Class for PDO reconnection
# *************************************************************************************************
I got this same error this morning after changing my DB properties in Laravel. I'd commented out the old settings and pasted in new ones. The problem was that the new settings where missing the DB_CONNECTION variable:
DB_CONNECTION=pgsql
Obviously you need to add whatever connection type you are using: sqlite, mysql, ...
I had the exact same problem.
I resolved this issue by doing unset on the PDO object instead of seting it to NULL.
For example:
function connectdb($dsn,$username,$password,$driver_options) {
try {
$dbh = new PDO($dsn,$username,$password,$driver_options);
return $dbh;
}
catch(PDOException $e)
{
print "DB Error: ".$e->getMessage()."<br />";
die();
}
}
function closedb(&$dbh) {
unset($dbh); // use this line instead of $dbh = NULL;
}
Also, it is highly recommended to unset all your PDO objects. That includes variables that contain prepared statements.
$pdo = new PDO(
$dsn,
$config['username'],
$config['password'],
array(
PDO::ATTR_PERSISTENT => true,
PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
)
);
try this. It may work

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