The CI framework (CodeIgniter) describes how to operate redis, codeigniterredis

The CI framework (CodeIgniter) describes how to operate redis, codeigniterredis

This article describes how to operate redis using the CI framework (CodeIgniter. We will share this with you for your reference. The details are as follows:

1. Add the following configuration lines to autoload. php:

$autoload['libraries'] = array('redis');

2. Add the redis. php file to/application/config.

The file content is as follows:

<?php// Default connection group$config['redis_default']['host'] = 'localhost';   // IP address or host$config['redis_default']['port'] = '6379';     // Default Redis port is 6379$config['redis_default']['password'] = '';     // Can be left empty when the server does not require AUTH$config['redis_slave']['host'] = '';$config['redis_slave']['port'] = '6379';$config['redis_slave']['password'] = '';?>

3. Add the Redis. php file to/application/libraries.

File Source: redis database package

File Content:

<?php defined('BASEPATH') OR exit('No direct script access allowed');/** * CodeIgniter Redis * * A CodeIgniter library to interact with Redis * * @package     CodeIgniter * @category    Libraries * @author     Joël Cox * @version     v0.4 * @link      https://github.com/joelcox/codeigniter-redis * @link      http://joelcox.nl * @license     http://www.opensource.org/licenses/mit-license.html */class CI_Redis {  /**   * CI   *   * CodeIgniter instance   * @var   object   */  private $_ci;  /**   * Connection   *   * Socket handle to the Redis server   * @var   handle   */  private $_connection;  /**   * Debug   *   * Whether we're in debug mode   * @var   bool   */  public $debug = FALSE;  /**   * CRLF   *   * User to delimiter arguments in the Redis unified request protocol   * @var   string   */  const CRLF = "\r\n";  /**   * Constructor   */  public function __construct($params = array())  {    log_message('debug', 'Redis Class Initialized');    $this->_ci = get_instance();    $this->_ci->load->config('redis');    // Check for the different styles of configs    if (isset($params['connection_group']))    {      // Specific connection group      $config = $this->_ci->config->item('redis_' . $params['connection_group']);    }    elseif (is_array($this->_ci->config->item('redis_default')))    {      // Default connection group      $config = $this->_ci->config->item('redis_default');    }    else    {      // Original config style      $config = array(        'host' => $this->_ci->config->item('redis_host'),        'port' => $this->_ci->config->item('redis_port'),        'password' => $this->_ci->config->item('redis_password'),      );    }    // Connect to Redis    $this->_connection = @fsockopen($config['host'], $config['port'], $errno, $errstr, 3);    // Display an error message if connection failed    if ( ! $this->_connection)    {      show_error('Could not connect to Redis at ' . $config['host'] . ':' . $config['port']);    }    // Authenticate when needed    $this->_auth($config['password']);  }  /**   * Call   *   * Catches all undefined methods   * @param  string method that was called   * @param  mixed  arguments that were passed   * @return mixed   */  public function __call($method, $arguments)  {    $request = $this->_encode_request($method, $arguments);    return $this->_write_request($request);  }  /**   * Command   *   * Generic command function, just like redis-cli   * @param  string full command as a string   * @return mixed   */  public function command($string)  {    $slices = explode(' ', $string);    $request = $this->_encode_request($slices[0], array_slice($slices, 1));    return $this->_write_request($request);  }  /**   * Auth   *   * Runs the AUTH command when password is set   * @param  string password for the Redis server   * @return void   */  private function _auth($password = NULL)  {    // Authenticate when password is set    if ( ! empty($password))    {      // See if we authenticated successfully      if ($this->command('AUTH ' . $password) !== 'OK')      {        show_error('Could not connect to Redis, invalid password');      }    }  }  /**   * Clear Socket   *   * Empty the socket buffer of theconnection so data does not bleed over   * to the next message.   * @return NULL   */  public function _clear_socket()  {    // Read one character at a time    fflush($this->_connection);    return NULL;  }  /**   * Write request   *   * Write the formatted request to the socket   * @param  string request to be written   * @return mixed   */  private function _write_request($request)  {    if ($this->debug === TRUE)    {      log_message('debug', 'Redis unified request: ' . $request);    }    // How long is the data we are sending?    $value_length = strlen($request);    // If there isn't any data, just return    if ($value_length <= 0) return NULL;    // Handle reply if data is less than or equal to 8192 bytes, just send it over    if ($value_length <= 8192)    {      fwrite($this->_connection, $request);    }    else    {      while ($value_length > 0)      {        // If we have more than 8192, only take what we can handle        if ($value_length > 8192) {          $send_size = 8192;        }        // Send our chunk        fwrite($this->_connection, $request, $send_size);        // How much is left to send?        $value_length = $value_length - $send_size;        // Remove data sent from outgoing data        $request = substr($request, $send_size, $value_length);      }    }    // Read our request into a variable    $return = $this->_read_request();    // Clear the socket so no data remains in the buffer    $this->_clear_socket();    return $return;  }  /**   * Read request   *   * Route each response to the appropriate interpreter   * @return mixed   */  private function _read_request()  {    $type = fgetc($this->_connection);    // Times we will attempt to trash bad data in search of a    // valid type indicator    $response_types = array('+', '-', ':', '$', '*');    $type_error_limit = 50;    $try = 0;    while ( ! in_array($type, $response_types) && $try < $type_error_limit)    {      $type = fgetc($this->_connection);      $try++;    }    if ($this->debug === TRUE)    {      log_message('debug', 'Redis response type: ' . $type);    }    switch ($type)    {      case '+':        return $this->_single_line_reply();        break;      case '-':        return $this->_error_reply();        break;      case ':':        return $this->_integer_reply();        break;      case '$':        return $this->_bulk_reply();        break;      case '*':        return $this->_multi_bulk_reply();        break;      default:        return FALSE;    }  }  /**   * Single line reply   *   * Reads the reply before the EOF   * @return mixed   */  private function _single_line_reply()  {    $value = rtrim(fgets($this->_connection));    $this->_clear_socket();    return $value;  }  /**   * Error reply   *   * Write error to log and return false   * @return bool   */  private function _error_reply()  {    // Extract the error message    $error = substr(rtrim(fgets($this->_connection)), 4);    log_message('error', 'Redis server returned an error: ' . $error);    $this->_clear_socket();    return FALSE;  }  /**   * Integer reply   *   * Returns an integer reply   * @return int   */  private function _integer_reply()  {    return (int) rtrim(fgets($this->_connection));  }  /**   * Bulk reply   *   * Reads to amount of bits to be read and returns value within   * the pointer and the ending delimiter   * @return string   */  private function _bulk_reply()  {    // How long is the data we are reading? Support waiting for data to    // fully return from redis and enter into socket.    $value_length = (int) fgets($this->_connection);    if ($value_length <= 0) return NULL;    $response = '';    // Handle reply if data is less than or equal to 8192 bytes, just read it    if ($value_length <= 8192)    {      $response = fread($this->_connection, $value_length);    }    else    {      $data_left = $value_length;        // If the data left is greater than 0, keep reading        while ($data_left > 0 ) {        // If we have more than 8192, only take what we can handle        if ($data_left > 8192)        {          $read_size = 8192;        }        else        {          $read_size = $data_left;        }        // Read our chunk        $chunk = fread($this->_connection, $read_size);        // Support reading very long responses that don't come through        // in one fread        $chunk_length = strlen($chunk);        while ($chunk_length < $read_size)        {          $keep_reading = $read_size - $chunk_length;          $chunk .= fread($this->_connection, $keep_reading);          $chunk_length = strlen($chunk);        }        $response .= $chunk;        // Re-calculate how much data is left to read        $data_left = $data_left - $read_size;      }    }    // Clear the socket in case anything remains in there    $this->_clear_socket();  return isset($response) ? $response : FALSE;  }  /**   * Multi bulk reply   *   * Reads n bulk replies and return them as an array   * @return array   */  private function _multi_bulk_reply()  {    // Get the amount of values in the response    $response = array();    $total_values = (int) fgets($this->_connection);    // Loop all values and add them to the response array    for ($i = 0; $i < $total_values; $i++)    {      // Remove the new line and carriage return before reading      // another bulk reply      fgets($this->_connection, 2);      // If this is a second or later pass, we also need to get rid      // of the $ indicating a new bulk reply and its length.      if ($i > 0)      {        fgets($this->_connection);        fgets($this->_connection, 2);      }      $response[] = $this->_bulk_reply();    }    // Clear the socket    $this->_clear_socket();    return isset($response) ? $response : FALSE;  }  /**   * Encode request   *   * Encode plain-text request to Redis protocol format   * @link  http://redis.io/topics/protocol   * @param  string request in plain-text   * @param  string additional data (string or array, depending on the request)   * @return string encoded according to Redis protocol   */  private function _encode_request($method, $arguments = array())  {    $request = '$' . strlen($method) . self::CRLF . $method . self::CRLF;    $_args = 1;    // Append all the arguments in the request string    foreach ($arguments as $argument)    {      if (is_array($argument))      {        foreach ($argument as $key => $value)        {          // Prepend the key if we're dealing with a hash          if (!is_int($key))          {            $request .= '$' . strlen($key) . self::CRLF . $key . self::CRLF;            $_args++;          }          $request .= '$' . strlen($value) . self::CRLF . $value . self::CRLF;          $_args++;        }      }      else      {        $request .= '$' . strlen($argument) . self::CRLF . $argument . self::CRLF;        $_args++;      }    }    $request = '*' . $_args . self::CRLF . $request;    return $request;  }  /**   * Info   *   * Overrides the default Redis response, so we can return a nice array   * of the server info instead of a nasty string.   * @return array   */  public function info($section = FALSE)  {    if ($section !== FALSE)    {      $response = $this->command('INFO '. $section);    }    else    {      $response = $this->command('INFO');    }    $data = array();    $lines = explode(self::CRLF, $response);    // Extract the key and value    foreach ($lines as $line)    {      $parts = explode(':', $line);      if (isset($parts[1])) $data[$parts[0]] = $parts[1];    }    return $data;  }  /**   * Debug   *   * Set debug mode   * @param  bool  set the debug mode on or off   * @return void   */  public function debug($bool)  {    $this->debug = (bool) $bool;  }  /**   * Destructor   *   * Kill the connection   * @return void   */  function __destruct()  {    if ($this->_connection) fclose($this->_connection);  }}?>

4. Then you can use it in the file.

<? Php if ($ this-> redis-> get ('Mark _'. $ gid) === null) {// If $ this-> redis-> set ('Mark _ 'is not set _'. $ gid, $ giftnum); // set $ this-> redis-> EXPIRE ('Mark _'. $ gid, 30*60); // set the expiration time (30 min)} else {$ giftnum = $ this-> redis-> get ('Mark _'. $ gid); // directly read the corresponding value from the cache}?>

5. The point is that what you need is explained in detail here.

All functions to be used only need to be modified$redis  ==> $this->redis

The function and usage of redis database in php can be referred to the http://www.bkjia.com/article/33887.htm of this site

Note that:

(1) Your local needs to install the redis Service (windows installation)
(2) Enable the redis Service
(3) for both windows and linux, install the redis extension of the corresponding php version.