codeigniter使用mongodb/redis

ci2.x版本，使用mongodb，需要安装pecl-php-mongo扩展（github上很多扩展已不可用，找到个可用版本纪录于此），添加到php.ini中

使用如下

    public function index()
    {
        //var_dump($this->mongo_db->insert("task",array("uid"=>2,"name"=>"ciaos")));
        //var_dump($this->mongo_db->get_where("task",array("uid"=>"ciaos")));
        var_dump($this->mongo_db->where(array("uid"=>"ciaos"))->update("task",array("task.math"=>array(1,2))));
    }

autoload.php增加redis,mongo_db自动加载

mongodb.php放到config目录下

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

// Generally will be localhost if you're querying from the machine that Mongo is installed on
$config['mongo_host'] = "localhost";

// Generally will be 27017 unless you've configured Mongo otherwise
$config['mongo_port'] = 27017;

// The database you want to work from (required)
$config['mongo_db'] = "dbname";

// Leave blank if Mongo is not running in auth mode
$config['mongo_user'] = "";
$config['mongo_pass'] = "";

// Persistant connections
$config['mongo_persist'] = TRUE;
$config['mongo_persist_key'] = 'ci_mongo_persist';

// Get results as an object instead of an array
$config['mongo_return'] = 'array'; // Set to object

// When you run an insert/update/delete how sure do you want to be that the database has received the query?
// safe = the database has receieved and executed the query
// fysnc = as above + the change has been committed to harddisk <- NOTE: will introduce a performance penalty
$config['mongo_query_safety'] = 'safe';

// Supress connection error password display
$config['mongo_supress_connect_error'] = TRUE;

// If you are having problems connecting try changing this to TRUE
$config['host_db_flag'] = FALSE;

Mongo_db.php放到library下

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**
 * CodeIgniter MongoDB Active Record Library
 *
 * A library to interface with the NoSQL database MongoDB. For more information see http://www.mongodb.org
 * Originally created by Alex Bilbie, but extended and updated by Kyle J. Dye
 *
 * @package        CodeIgniter
 * @author        Alex Bilbie | www.alexbilbie.com | alex@alexbilbie.com
 * @author        Kyle J. Dye | www.kyledye.com | kyle@kyledye.com
 * @copyright    Copyright (c) 2010, Alex Bilbie.
 * @license        http://codeigniter.com/user_guide/license.html
 * @link        http://alexbilbie.com
 * @link        http://kyledye.com
 * @version        Version 0.3.7
 */

class Mongo_db {

    private $CI;
    private $config_file = 'mongodb';

    private $connection;
    private $db;
    private $connection_string;

    private $host;
    private $port;
    private $user;
    private $pass;
    private $dbname;
    private $persist;
    private $persist_key;
    private $query_safety = 'safe';

    private $selects = array();
    public  $wheres = array(); // Public to make debugging easier
    private $sorts = array();

    private $limit = 999999;
    private $offset = 0;

    /**
    *    --------------------------------------------------------------------------------
    *    CONSTRUCTOR
    *    --------------------------------------------------------------------------------
    *
    *    Automatically check if the Mongo PECL extension has been installed/enabled.
    *    Generate the connection string and establish a connection to the MongoDB.
    */

    public function __construct()
    {
        if ( ! class_exists('Mongo'))
        {
            show_error("The MongoDB PECL extension has not been installed or enabled", 500);
        }

        $this->CI =& get_instance();
        $this->connection_string();
        $this->connect();
    }

    /**
    *    --------------------------------------------------------------------------------
    *    Switch_db
    *    --------------------------------------------------------------------------------
    *
    *    Switch from default database to a different db
    */

    public function switch_db($database = '')
    {
        if (empty($database))
        {
            show_error("To switch MongoDB databases, a new database name must be specified", 500);
        }

        $this->dbname = $database;

        try
        {
            $this->db = $this->connection->{$this->dbname};
            return (TRUE);
        }
        catch (Exception $e)
        {
            show_error("Unable to switch Mongo Databases: {$e->getMessage()}", 500);
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    Drop_db
    *    --------------------------------------------------------------------------------
    *
    *    Drop a Mongo database
    *    @usage: $this->mongo_db->drop_db("foobar");
    */
    public function drop_db($database = '')
    {
        if (empty($database))
        {
            show_error('Failed to drop MongoDB database because name is empty', 500);
        }

        else
        {
            try
            {
                $this->connection->{$database}->drop();
                return (TRUE);
            }
            catch (Exception $e)
            {
                show_error("Unable to drop Mongo database `{$database}`: {$e->getMessage()}", 500);
            }

        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    Drop_collection
    *    --------------------------------------------------------------------------------
    *
    *    Drop a Mongo collection
    *    @usage: $this->mongo_db->drop_collection('foo', 'bar');
    */
    public function drop_collection($db = "", $col = "")
    {
        if (empty($db))
        {
            show_error('Failed to drop MongoDB collection because database name is empty', 500);
        }

        if (empty($col))
        {
            show_error('Failed to drop MongoDB collection because collection name is empty', 500);
        }

        else
        {
            try
            {
                $this->connection->{$db}->{$col}->drop();
                return TRUE;
            }
            catch (Exception $e)
            {
                show_error("Unable to drop Mongo collection `{$col}`: {$e->getMessage()}", 500);
            }
        }

        return($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    SELECT FIELDS
    *    --------------------------------------------------------------------------------
    *
    *    Determine which fields to include OR which to exclude during the query process.
    *    Currently, including and excluding at the same time is not available, so the
    *    $includes array will take precedence over the $excludes array.  If you want to
    *    only choose fields to exclude, leave $includes an empty array().
    *
    *    @usage: $this->mongo_db->select(array('foo', 'bar'))->get('foobar');
    */

    public function select($includes = array(), $excludes = array())
    {
         if ( ! is_array($includes))
         {
             $includes = array();
         }

         if ( ! is_array($excludes))
         {
             $excludes = array();
         }

         if ( ! empty($includes))
         {
             foreach ($includes as $col)
             {
                 $this->selects[$col] = 1;
             }
         }
         else
         {
             foreach ($excludes as $col)
             {
                 $this->selects[$col] = 0;
             }
         }
         return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents based on these search parameters.  The $wheres array should
    *    be an associative array with the field as the key and the value as the search
    *    criteria.
    *
    *    @usage : $this->mongo_db->where(array('foo' => 'bar'))->get('foobar');
    */

    public function where($wheres = array())
     {
         foreach ($wheres as $wh => $val)
         {
             $this->wheres[$wh] = $val;
         }
         return ($this);
     }

    /**
    *    --------------------------------------------------------------------------------
    *    OR_WHERE PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field may be something else
    *
    *    @usage : $this->mongo_db->or_where(array( array('foo'=>'bar', 'bar'=>'foo' ))->get('foobar');
    */

    public function or_where($wheres = array())
    {
        if (count($wheres) > 0)
        {
            if ( ! isset($this->wheres['$or']) || ! is_array($this->wheres['$or']))
            {
                $this->wheres['$or'] = array();
            }

            foreach ($wheres as $wh => $val)
            {
                $this->wheres['$or'][] = array($wh=>$val);
            }
        }
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE_IN PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is in a given $in array().
    *
    *    @usage : $this->mongo_db->where_in('foo', array('bar', 'zoo', 'blah'))->get('foobar');
    */

    public function where_in($field = "", $in = array())
    {
        $this->_where_init($field);
        $this->wheres[$field]['$in'] = $in;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE_IN_ALL PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is in all of a given $in array().
    *
    *    @usage : $this->mongo_db->where_in('foo', array('bar', 'zoo', 'blah'))->get('foobar');
    */

    public function where_in_all($field = "", $in = array())
    {
        $this->_where_init($field);
        $this->wheres[$field]['$all'] = $in;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE_NOT_IN PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is not in a given $in array().
    *
    *    @usage : $this->mongo_db->where_not_in('foo', array('bar', 'zoo', 'blah'))->get('foobar');
    */

    public function where_not_in($field = "", $in = array())
    {
        $this->_where_init($field);
        $this->wheres[$field]['$nin'] = $in;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE GREATER THAN PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is greater than $x
    *
    *    @usage : $this->mongo_db->where_gt('foo', 20);
    */

    public function where_gt($field = "", $x)
    {
        $this->_where_init($field);
        $this->wheres[$field]['$gt'] = $x;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE GREATER THAN OR EQUAL TO PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is greater than or equal to $x
    *
    *    @usage : $this->mongo_db->where_gte('foo', 20);
    */

    public function where_gte($field = "", $x)
    {
        $this->_where_init($field);
        $this->wheres[$field]['$gte'] = $x;
        return($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE LESS THAN PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is less than $x
    *
    *    @usage : $this->mongo_db->where_lt('foo', 20);
    */

    public function where_lt($field = "", $x)
    {
        $this->_where_init($field);
        $this->wheres[$field]['$lt'] = $x;
        return($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE LESS THAN OR EQUAL TO PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is less than or equal to $x
    *
    *    @usage : $this->mongo_db->where_lte('foo', 20);
    */

    public function where_lte($field = "", $x)
    {
        $this->_where_init($field);
        $this->wheres[$field]['$lte'] = $x;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE BETWEEN PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is between $x and $y
    *
    *    @usage : $this->mongo_db->where_between('foo', 20, 30);
    */

    public function where_between($field = "", $x, $y)
    {
        $this->_where_init($field);
        $this->wheres[$field]['$gte'] = $x;
        $this->wheres[$field]['$lte'] = $y;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE BETWEEN AND NOT EQUAL TO PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is between but not equal to $x and $y
    *
    *    @usage : $this->mongo_db->where_between_ne('foo', 20, 30);
    */

    public function where_between_ne($field = "", $x, $y)
    {
        $this->_where_init($field);
        $this->wheres[$field]['$gt'] = $x;
        $this->wheres[$field]['$lt'] = $y;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE NOT EQUAL TO PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the value of a $field is not equal to $x
    *
    *    @usage : $this->mongo_db->where_not_equal('foo', 1)->get('foobar');
    */

    public function where_ne($field = '', $x)
    {
        $this->_where_init($field);
        $this->wheres[$field]['$ne'] = $x;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE NOT EQUAL TO PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents nearest to an array of coordinates (your collection must have a geospatial index)
    *
    *    @usage : $this->mongo_db->where_near('foo', array('50','50'))->get('foobar');
    */

    function where_near($field = '', $co = array())
    {
        $this->__where_init($field);
        $this->where[$what]['$near'] = $co;
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    LIKE PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents where the (string) value of a $field is like a value. The defaults
    *    allow for a case-insensitive search.
    *
    *    @param $flags
    *    Allows for the typical regular expression flags:
    *        i = case insensitive
    *        m = multiline
    *        x = can contain comments
    *        l = locale
    *        s = dotall, "." matches everything, including newlines
    *        u = match unicode
    *
    *    @param $enable_start_wildcard
    *    If set to anything other than TRUE, a starting line character "^" will be prepended
    *    to the search value, representing only searching for a value at the start of
    *    a new line.
    *
    *    @param $enable_end_wildcard
    *    If set to anything other than TRUE, an ending line character "$" will be appended
    *    to the search value, representing only searching for a value at the end of
    *    a line.
    *
    *    @usage : $this->mongo_db->like('foo', 'bar', 'im', FALSE, TRUE);
    */

    public function like($field = "", $value = "", $flags = "i", $enable_start_wildcard = TRUE, $enable_end_wildcard = TRUE)
     {
         $field = (string) trim($field);
         $this->where_init($field);
         $value = (string) trim($value);
         $value = quotemeta($value);

         if ($enable_start_wildcard !== TRUE)
         {
             $value = "^" . $value;
         }

         if ($enable_end_wildcard !== TRUE)
         {
             $value .= "$";
         }

         $regex = "/$value/$flags";
         $this->wheres[$field] = new MongoRegex($regex);
         return ($this);
     }

    /**
    *    --------------------------------------------------------------------------------
    *    ORDER BY PARAMETERS
    *    --------------------------------------------------------------------------------
    *
    *    Sort the documents based on the parameters passed. To set values to descending order,
    *    you must pass values of either -1, FALSE, 'desc', or 'DESC', else they will be
    *    set to 1 (ASC).
    *
    *    @usage : $this->mongo_db->where_between('foo', 20, 30);
    */

    public function order_by($fields = array())
    {
        foreach ($fields as $col => $val)
        {
            if ($val == -1 || $val === FALSE || strtolower($val) == 'desc')
            {
                $this->sorts[$col] = -1;
            }
            else
            {
                $this->sorts[$col] = 1;
            }
        }
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    LIMIT DOCUMENTS
    *    --------------------------------------------------------------------------------
    *
    *    Limit the result set to $x number of documents
    *
    *    @usage : $this->mongo_db->limit($x);
    */

    public function limit($x = 99999)
    {
        if ($x !== NULL && is_numeric($x) && $x >= 1)
        {
            $this->limit = (int) $x;
        }
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    OFFSET DOCUMENTS
    *    --------------------------------------------------------------------------------
    *
    *    Offset the result set to skip $x number of documents
    *
    *    @usage : $this->mongo_db->offset($x);
    */

    public function offset($x = 0)
    {
        if ($x !== NULL && is_numeric($x) && $x >= 1)
        {
            $this->offset = (int) $x;
        }
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    GET_WHERE
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents based upon the passed parameters
    *
    *    @usage : $this->mongo_db->get_where('foo', array('bar' => 'something'));
    */

    public function get_where($collection = "", $where = array())
    {
        return ($this->where($where)->get($collection));
    }

    /**
    *    --------------------------------------------------------------------------------
    *    GET
    *    --------------------------------------------------------------------------------
    *
    *    Get the documents based upon the passed parameters
    *
    *    @usage : $this->mongo_db->get('foo', array('bar' => 'something'));
    */

     public function get($collection = "")
     {
         if (empty($collection))
         {
             show_error("In order to retreive documents from MongoDB, a collection name must be passed", 500);
         }

         $results = array();

         $documents = $this->db->{$collection}->find($this->wheres, $this->selects)->limit((int) $this->limit)->skip((int) $this->offset)->sort($this->sorts);

         // Clear
         $this->_clear();

         $returns = array();

         foreach ($documents as $doc)
         {
             $returns[] = $doc;
         }

         if ($this->CI->config->item('mongo_return') == 'object')
        {
            return (object)$returns;
        }

        else
        {
            return $returns;
        }

     }

    /**
    *    --------------------------------------------------------------------------------
    *    COUNT
    *    --------------------------------------------------------------------------------
    *
    *    Count the documents based upon the passed parameters
    *
    *    @usage : $this->mongo_db->get('foo');
    */

    public function count($collection = "") {
        if (empty($collection))
        {
            show_error("In order to retreive a count of documents from MongoDB, a collection name must be passed", 500);
        }

        $count = $this->db->{$collection}->find($this->wheres)->limit((int) $this->limit)->skip((int) $this->offset)->count();
        $this->_clear();
        return ($count);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    INSERT
    *    --------------------------------------------------------------------------------
    *
    *    Insert a new document into the passed collection
    *
    *    @usage : $this->mongo_db->insert('foo', $data = array());
    */

    public function insert($collection = "", $insert = array())
    {
        if (empty($collection))
        {
            show_error("No Mongo collection selected to insert into", 500);
        }

        if (count($insert) == 0 || !is_array($insert))
        {
            show_error("Nothing to insert into Mongo collection or insert is not an array", 500);
        }

        try
        {
            $this->db->{$collection}->insert($insert, array( "w" => 1));
            if (isset($insert['_id']))
            {
                return ($insert['_id']);
            }
            else
            {
                return (FALSE);
            }
        }
        catch (MongoCursorException $e)
        {
            show_error("Insert of data into MongoDB failed: {$e->getMessage()}", 500);
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    UPDATE
    *    --------------------------------------------------------------------------------
    *
    *    Updates a single document
    *
    *    @usage: $this->mongo_db->update('foo', $data = array());
    */

    public function update($collection = "", $data = array(), $options = array())
    {
        if (empty($collection))
        {
            show_error("No Mongo collection selected to update", 500);
        }

        if (count($data) == 0 || ! is_array($data))
        {
            show_error("Nothing to update in Mongo collection or update is not an array", 500);
        }

        try
        {
            $options = array_merge($options, array("w" => 1, 'multiple' => FALSE));
            $this->db->{$collection}->update($this->wheres, array('$set' => $data), $options);
            $this->_clear();
            return (TRUE);
        }
        catch (MongoCursorException $e)
        {
            show_error("Update of data into MongoDB failed: {$e->getMessage()}", 500);
        }

    }

    /**
    *    --------------------------------------------------------------------------------
    *    UPDATE_ALL
    *    --------------------------------------------------------------------------------
    *
    *    Updates a collection of documents
    *
    *    @usage: $this->mongo_db->update_all('foo', $data = array());
    */

    public function update_all($collection = "", $data = array())
    {
        if (empty($collection))
        {
            show_error("No Mongo collection selected to update", 500);
        }

        if (count($data) == 0 || ! is_array($data))
        {
            show_error("Nothing to update in Mongo collection or update is not an array", 500);
        }

        try
        {
            $this->db->{$collection}->update($this->wheres, array('$set' => $data), array($this->query_safety => TRUE, 'multiple' => TRUE));
            $this->_clear();
            return (TRUE);
        }
        catch (MongoCursorException $e)
        {
            show_error("Update of data into MongoDB failed: {$e->getMessage()}", 500);
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    DELETE
    *    --------------------------------------------------------------------------------
    *
    *    delete document from the passed collection based upon certain criteria
    *
    *    @usage : $this->mongo_db->delete('foo', $data = array());
    */

    public function delete($collection = "")
    {
        if (empty($collection))
        {
            show_error("No Mongo collection selected to delete from", 500);
        }

        try
        {
            $this->db->{$collection}->remove($this->wheres, array($this->query_safety => TRUE, 'justOne' => TRUE));
            $this->_clear();
            return (TRUE);
        }
        catch (MongoCursorException $e)
        {
            show_error("Delete of data into MongoDB failed: {$e->getMessage()}", 500);
        }

    }

    /**
    *    --------------------------------------------------------------------------------
    *    DELETE_ALL
    *    --------------------------------------------------------------------------------
    *
    *    Delete all documents from the passed collection based upon certain criteria
    *
    *    @usage : $this->mongo_db->delete_all('foo', $data = array());
    */

     public function delete_all($collection = "")
     {
        if (empty($collection))
        {
            show_error("No Mongo collection selected to delete from", 500);
        }

        try
        {
            $this->db->{$collection}->remove($this->wheres, array($this->query_safety => TRUE, 'justOne' => FALSE));
            $this->_clear();
            return (TRUE);
        }
        catch (MongoCursorException $e)
        {
            show_error("Delete of data into MongoDB failed: {$e->getMessage()}", 500);
        }

    }

    /**
    *    --------------------------------------------------------------------------------
    *    COMMAND
    *    --------------------------------------------------------------------------------
    *
    *    Runs a MongoDB command (such as GeoNear). See the MongoDB documentation for more usage scenarios:
    *    http://dochub.mongodb.org/core/commands
    *
    *    @usage : $this->mongo_db->command(array('geoNear'=>'buildings', 'near'=>array(53.228482, -0.547847), 'num' => 10, 'nearSphere'=>true));
    */

    public function command($query = array())
    {
        try
        {
            $run = $this->db->command($query);
            return $run;
        }

        catch (MongoCursorException $e)
        {
            show_error("MongoDB command failed to execute: {$e->getMessage()}", 500);
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    ADD_INDEX
    *    --------------------------------------------------------------------------------
    *
    *    Ensure an index of the keys in a collection with optional parameters. To set values to descending order,
    *    you must pass values of either -1, FALSE, 'desc', or 'DESC', else they will be
    *    set to 1 (ASC).
    *
    *    @usage : $this->mongo_db->add_index($collection, array('first_name' => 'ASC', 'last_name' => -1), array('unique' => TRUE));
    */

    public function add_index($collection = "", $keys = array(), $options = array())
    {
        if (empty($collection))
        {
            show_error("No Mongo collection specified to add index to", 500);
        }

        if (empty($keys) || ! is_array($keys))
        {
            show_error("Index could not be created to MongoDB Collection because no keys were specified", 500);
        }

        foreach ($keys as $col => $val)
        {
            if($val == -1 || $val === FALSE || strtolower($val) == 'desc')
            {
                $keys[$col] = -1;
            }
            else
            {
                $keys[$col] = 1;
            }
        }

        if ($this->db->{$collection}->ensureIndex($keys, $options) == TRUE)
        {
            $this->_clear();
            return ($this);
        }
        else
        {
            show_error("An error occured when trying to add an index to MongoDB Collection", 500);
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    REMOVE_INDEX
    *    --------------------------------------------------------------------------------
    *
    *    Remove an index of the keys in a collection. To set values to descending order,
    *    you must pass values of either -1, FALSE, 'desc', or 'DESC', else they will be
    *    set to 1 (ASC).
    *
    *    @usage : $this->mongo_db->remove_index($collection, array('first_name' => 'ASC', 'last_name' => -1));
    */

    public function remove_index($collection = "", $keys = array())
    {
        if (empty($collection))
        {
            show_error("No Mongo collection specified to remove index from", 500);
        }

        if (empty($keys) || ! is_array($keys))
        {
            show_error("Index could not be removed from MongoDB Collection because no keys were specified", 500);
        }

        if ($this->db->{$collection}->deleteIndex($keys, $options) == TRUE)
        {
            $this->_clear();
            return ($this);
        }
        else
        {
            show_error("An error occured when trying to remove an index from MongoDB Collection", 500);
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    REMOVE_ALL_INDEXES
    *    --------------------------------------------------------------------------------
    *
    *    Remove all indexes from a collection.
    *
    *    @usage : $this->mongo_db->remove_all_index($collection);
    */

    public function remove_all_indexes($collection = "")
    {
        if (empty($collection))
        {
            show_error("No Mongo collection specified to remove all indexes from", 500);
        }
        $this->db->{$collection}->deleteIndexes();
        $this->_clear();
        return ($this);
    }

    /**
    *    --------------------------------------------------------------------------------
    *    LIST_INDEXES
    *    --------------------------------------------------------------------------------
    *
    *    Lists all indexes in a collection.
    *
    *    @usage : $this->mongo_db->list_indexes($collection);
    */
    public function list_indexes($collection = "")
    {
        if (empty($collection))
        {
            show_error("No Mongo collection specified to remove all indexes from", 500);
        }

        return ($this->db->{$collection}->getIndexInfo());
    }

    /**
    *    --------------------------------------------------------------------------------
    *    CONNECT TO MONGODB
    *    --------------------------------------------------------------------------------
    *
    *    Establish a connection to MongoDB using the connection string generated in
    *    the connection_string() method.  If 'mongo_persist_key' was set to true in the
    *    config file, establish a persistent connection.  We allow for only the 'persist'
    *    option to be set because we want to establish a connection immediately.
    */

    private function connect()
    {
        $options = array();
        if ($this->persist === TRUE)
        {
            $options['persist'] = isset($this->persist_key) && !empty($this->persist_key) ? $this->persist_key : 'ci_mongo_persist';
        }

        try
        {
            $this->connection = new MongoClient($this->connection_string, $options);
            $this->db = $this->connection->{$this->dbname};
            return ($this);
        }
        catch (MongoConnectionException $e)
        {
            if($this->CI->config->item('mongo_supress_connect_error'))
            {
                show_error("Unable to connect to MongoDB", 500);
            }
            else
            {
                show_error("Unable to connect to MongoDB: {$e->getMessage()}", 500);
            }
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    BUILD CONNECTION STRING
    *    --------------------------------------------------------------------------------
    *
    *    Build the connection string from the config file.
    */

    private function connection_string()
    {
        $this->CI->config->load($this->config_file);

        $this->host    = trim($this->CI->config->item('mongo_host'));
        $this->port = trim($this->CI->config->item('mongo_port'));
        $this->user = trim($this->CI->config->item('mongo_user'));
        $this->pass = trim($this->CI->config->item('mongo_pass'));
        $this->dbname = trim($this->CI->config->item('mongo_db'));
        $this->persist = trim($this->CI->config->item('mongo_persist'));
        $this->persist_key = trim($this->CI->config->item('mongo_persist_key'));
        $this->query_safety = trim($this->CI->config->item('mongo_query_safety'));
        $dbhostflag = (bool)$this->CI->config->item('host_db_flag');

        $connection_string = "mongodb://";

        if (empty($this->host))
        {
            show_error("The Host must be set to connect to MongoDB", 500);
        }

        if (empty($this->dbname))
        {
            show_error("The Database must be set to connect to MongoDB", 500);
        }

        if ( ! empty($this->user) && ! empty($this->pass))
        {
            $connection_string .= "{$this->user}:{$this->pass}@";
        }

        if (isset($this->port) && ! empty($this->port))
        {
            $connection_string .= "{$this->host}:{$this->port}";
        }
        else
        {
            $connection_string .= "{$this->host}";
        }

        if ($dbhostflag === TRUE)
        {
            $this->connection_string = trim($connection_string) . '/' . $this->dbname;
        }

        else
        {
            $this->connection_string = trim($connection_string);
        }
    }

    /**
    *    --------------------------------------------------------------------------------
    *    _clear
    *    --------------------------------------------------------------------------------
    *
    *    Resets the class variables to default settings
    */

    private function _clear()
    {
        $this->selects    = array();
        $this->wheres    = array();
        $this->limit    = 999999;
        $this->offset    = 0;
        $this->sorts    = array();
    }

    /**
    *    --------------------------------------------------------------------------------
    *    WHERE INITIALIZER
    *    --------------------------------------------------------------------------------
    *
    *    Prepares parameters for insertion in $wheres array().
    */

    private function _where_init($param)
    {
        if ( ! isset($this->wheres[$param]))
        {
            $this->wheres[ $param ] = array();
        }
    }

}

// EOF

使用redis也需要安装redis扩展

redis.php放config目录

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * Config for the CodeIgniter Redis library
 *
 * @see ../libraries/Redis.php
 */

// Default connection group
$config['redis_default']['host'] = '127.0.0.1‘;
$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'] = '';

Redis.php放library目录

<?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 = TRUE;

    /**
     * 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 ($this->debug === TRUE)
        {
            log_message('debug', 'Redis response length: ' . $value_length);
        }

        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);
            //fix read_size error
            // Read our chunk
            $read_size = $value_length;
            $chunk = fread($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;
        }
        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;

            }

        }

        if ($this->debug === TRUE)
        {
            log_message('debug', 'Redis response real_length is: ' . strlen($response));
            if ($value_length != strlen($response)) {
                log_message('debug', 'Redis response get a output-error');
            }
        }

        // 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()
    {
        log_message('debug', 'Redis Class destruct');
        if ($this->_connection) fclose($this->_connection);
    }
}