How to connect mongoDB with codeigniter

 First create a file inside the config folder with name mongo_db.php and copy and paste the following code. You need to set up the database name, username and password of the your mongoDB. if you don’t know how to install mongoDB in read this article How to install up MongoDB and PHP on Ubuntu.After installation create the database and collection read this How to create, use and drop database in mongoDB. and How to create collection and insert, delete and update data in mongoDB.

$config['mongo_db']['active'] = 'default';
$config['mongo_db']['default']['no_auth'] = FALSE;
$config['mongo_db']['default']['hostname'] = 'localhost';
$config['mongo_db']['default']['port'] = '27017';
$config['mongo_db']['default']['username'] = 'admin';
$config['mongo_db']['default']['password'] = '123456';
$config['mongo_db']['default']['database'] = 'mydatabase';
$config['mongo_db']['default']['db_debug'] = TRUE;
$config['mongo_db']['default']['return_as'] = 'array';
$config['mongo_db']['default']['write_concerns'] = (int)1;
$config['mongo_db']['default']['journal'] = TRUE;
$config['mongo_db']['default']['read_preference'] = NULL;
$config['mongo_db']['default']['read_preference_tags'] = NULL;
$config['mongo_db']['default']['no_auth'] = FALSE;
$config['mongo_db']['test']['hostname'] = 'localhost';
$config['mongo_db']['test']['port'] = '27017';
$config['mongo_db']['test']['username'] = '';
$config['mongo_db']['test']['password'] = '';
$config['mongo_db']['test']['database'] = '';
$config['mongo_db']['test']['db_debug'] = TRUE;
$config['mongo_db']['test']['return_as'] = 'array';
$config['mongo_db']['test']['write_concerns'] = (int)1;
$config['mongo_db']['test']['journal'] = TRUE;
$config['mongo_db']['test']['read_preference'] = NULL;
$config['mongo_db']['test']['read_preference_tags'] = NULL;
Now open the folder application/libraries and create a file name Mongo_db.php and copy and paste the following code. This will be libray to connect to the mongoDB.



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

Class Mongo_db{

private $CI;
private $config = array();
private $param = array();
private $activate;
private $connect;
private $db;
private $hostname;
private $port;
private $database;
private $username;
private $password;
private $debug;
private $write_concerns;
private $journal;
private $selects = array();
private $updates = array();
private $wheres = array();
private $limit = 999999;
private $offset = 0;
private $sorts = array();
private $return_as = 'array';

function __construct($param)
{

if ( ! class_exists('Mongo') && ! class_exists('MongoClient'))
{
show_error("The MongoDB PECL extension has not been installed or enabled", 500);
}
$this->CI =& get_instance();
$this->CI->load->config('mongo_db');
$this->config = $this->CI->config->item('mongo_db');
$this->param = $param;
$this->connect();
}

function __destruct()
{
if(is_object($this->connect))
{
$this->connect->close();
}
}

private function prepare()
{
if(is_array($this->param) && count($this->param) > 0 && isset($this->param['activate']) == TRUE)
{
$this->activate = $this->param['activate'];
}
else if(isset($this->config['active']) && !empty($this->config['active']))
{
$this->activate = $this->config['active'];
}else
{
show_error("MongoDB configuration is missing.", 500);
}

if(isset($this->config[$this->activate]) == TRUE)
{
if(empty($this->config[$this->activate]['hostname']))
{
show_error("Hostname missing from mongodb config group : {$this->activate}", 500);
}
else
{
$this->hostname = trim($this->config[$this->activate]['hostname']);
}

if(empty($this->config[$this->activate]['port']))
{
show_error("Port number missing from mongodb config group : {$this->activate}", 500);
}
else
{
$this->port = trim($this->config[$this->activate]['port']);
}

if(empty($this->config[$this->activate]['username']))
{
show_error("Username missing from mongodb config group : {$this->activate}", 500);
}
else
{
$this->username = trim($this->config[$this->activate]['username']);
}

if(empty($this->config[$this->activate]['password']))
{
show_error("Password missing from mongodb config group : {$this->activate}", 500);
}
else
{
$this->password = trim($this->config[$this->activate]['password']);
}

if(empty($this->config[$this->activate]['database']))
{
show_error("Database name missing from mongodb config group : {$this->activate}", 500);
}
else
{
$this->database = trim($this->config[$this->activate]['database']);
}

if(empty($this->config[$this->activate]['db_debug']))
{
$this->debug = FALSE;
}
else
{
$this->debug = $this->config[$this->activate]['db_debug'];
}

if(empty($this->config[$this->activate]['write_concerns']))
{
$this->write_concerns = 1;
}
else
{
$this->write_concerns = $this->config[$this->activate]['write_concerns'];
}

if(empty($this->config[$this->activate]['journal']))
{
$this->journal = TRUE;
}
else
{
$this->journal = $this->config[$this->activate]['journal'];
}

if(empty($this->config[$this->activate]['return_as']))
{
$this->return_as = 'array';
}
else
{
$this->return_as = $this->config[$this->activate]['return_as'];
}
}
else
{
show_error("mongodb config group :  <strong>{$this->activate}</strong> does not exist.", 500);
}
}


private function connect()
{
$this->prepare();
try
{
$dns = "mongodb://{$this->hostname}:{$this->port}/{$this->database}";
if(isset($this->config[$this->activate]['no_auth']) == TRUE && $this->config[$this->activate]['no_auth'] == TRUE)
{
$options = array();
}
else
{
$options = array('username'=>$this->username, 'password'=>$this->password);
}
$this->connect = new MongoClient($dns, $options);
$this->db = $this->connect->selectDB($this->database);
$this->db = $this->connect->{$this->database};
}
catch (MongoConnectionException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Unable to connect to MongoDB: {$e->getMessage()}", 500);
}
else
{
show_error("Unable to connect to MongoDB", 500);
}
}
}

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

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

try
{
$this->db->{$collection}->insert($insert, array('w' => $this->write_concerns, 'j'=>$this->journal));
if (isset($insert['_id']))
{
return ($insert['_id']);
}
else
{
return (FALSE);
}
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Insert of data into MongoDB failed: {$e->getMessage()}", 500);
}
else
{
show_error("Insert of data into MongoDB failed", 500);
}
}
}
public function batch_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}->batchInsert($insert, array('w' => $this->write_concerns, 'j'=>$this->journal));
if (isset($insert['_id']))
{
return ($insert['_id']);
}
else
{
return (FALSE);
}
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Batch insert of data into MongoDB failed: {$e->getMessage()}", 500);
}
else
{
show_error("Batch insert of data into MongoDB failed", 500);
}
}
}
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;
}
}
if ( ! empty($excludes))
{
foreach ($excludes as $col)
{
$this->selects[$col] = 0;
}
}
return ($this);
}

public function where($wheres, $value = null)
{
if (is_array($wheres))
{
foreach ($wheres as $wh => $val)
{
$this->wheres[$wh] = $val;
}
}
else
{
$this->wheres[$wheres] = $value;
}
return $this;
}

public function or_where($wheres = array())
{
if (is_array($wheres) && 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 ($this);
}
else
{
show_error("Where value should be an array.", 500);
}
}
public function where_in($field = "", $in = array())
{
if (empty($field))
{
show_error("Mongo field is require to perform where in query.", 500);
}

if (is_array($in) && count($in) > 0)
{
$this->_w($field);
$this->wheres[$field]['$in'] = $in;
return ($this);
}
else
{
show_error("in value should be an array.", 500);
}
}

public function where_in_all($field = "", $in = array())
{
if (empty($field))
{
show_error("Mongo field is require to perform where all in query.", 500);
}

if (is_array($in) && count($in) > 0)
{
$this->_w($field);
$this->wheres[$field]['$all'] = $in;
return ($this);
}
else
{
show_error("in value should be an array.", 500);
}
}

public function where_not_in($field = "", $in = array())
{
if (empty($field))
{
show_error("Mongo field is require to perform where not in query.", 500);
}

if (is_array($in) && count($in) > 0)
{
$this->_w($field);
$this->wheres[$field]['$nin'] = $in;
return ($this);
}
else
{
show_error("in value should be an array.", 500);
}
}
public function where_gt($field = "", $x)
{
if (!isset($field))
{
show_error("Mongo field is require to perform greater then query.", 500);
}

if (!isset($x))
{
show_error("Mongo field's value is require to perform greater then query.", 500);
}

$this->_w($field);
$this->wheres[$field]['$gt'] = $x;
return ($this);
}

public function where_gte($field = "", $x)
{
if (!isset($field))
{
show_error("Mongo field is require to perform greater then or equal query.", 500);
}

if (!isset($x))
{
show_error("Mongo field's value is require to perform greater then or equal query.", 500);
}

$this->_w($field);
$this->wheres[$field]['$gte'] = $x;
return($this);
}

public function where_lt($field = "", $x)
{
if (!isset($field))
{
show_error("Mongo field is require to perform less then query.", 500);
}

if (!isset($x))
{
show_error("Mongo field's value is require to perform less then query.", 500);
}

$this->_w($field);
$this->wheres[$field]['$lt'] = $x;
return($this);
}
public function where_lte($field = "", $x)
{
if (!isset($field))
{
show_error("Mongo field is require to perform less then or equal to query.", 500);
}

if (!isset($x))
{
show_error("Mongo field's value is require to perform less then or equal to query.", 500);
}

$this->_w($field);
$this->wheres[$field]['$lte'] = $x;
return ($this);
}

public function where_between($field = "", $x, $y)
{
if (!isset($field))
{
show_error("Mongo field is require to perform greater then or equal to query.", 500);
}

if (!isset($x))
{
show_error("Mongo field's start value is require to perform greater then or equal to query.", 500);
}

if (!isset($y))
{
show_error("Mongo field's end value is require to perform greater then or equal to query.", 500);
}

$this->_w($field);
$this->wheres[$field]['$gte'] = $x;
$this->wheres[$field]['$lte'] = $y;
return ($this);
}

public function where_between_ne($field = "", $x, $y)
{
if (!isset($field))
{
show_error("Mongo field is require to perform between and but not equal to query.", 500);
}

if (!isset($x))
{
show_error("Mongo field's start value is require to perform between and but not equal to query.", 500);
}

if (!isset($y))
{
show_error("Mongo field's end value is require to perform between and but not equal to query.", 500);
}

$this->_w($field);
$this->wheres[$field]['$gt'] = $x;
$this->wheres[$field]['$lt'] = $y;
return ($this);
}

public function where_ne($field = '', $x)
{
if (!isset($field))
{
show_error("Mongo field is require to perform Where not equal to query.", 500);
}

if (!isset($x))
{
show_error("Mongo field's value is require to perform Where not equal to query.", 500);
}

$this->_w($field);
$this->wheres[$field]['$ne'] = $x;
return ($this);
}

public function like($field = "", $value = "", $flags = "i", $enable_start_wildcard = TRUE, $enable_end_wildcard = TRUE)
{
if (empty($field))
{
show_error("Mongo field is require to perform like query.", 500);
}

if (empty($value))
{
show_error("Mongo field's value is require to like query.", 500);
}

$field = (string) trim($field);
$this->_w($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);
}
public function get($collection = "")
{
if (empty($collection))
{
show_error("In order to retrieve documents from MongoDB, a collection name must be passed", 500);
}
try{
$documents = $this->db->{$collection}
->find($this->wheres, $this->selects)
->limit((int) $this->limit)
->skip((int) $this->offset)
->sort($this->sorts);
// Clear
$this->_clear();
$returns = array();
while ($documents->hasNext())
{
if ($this->return_as == 'object')
{
$returns[] = (object) $documents->getNext();
}
else
{
$returns[] = (array) $documents->getNext();
}
}
if ($this->return_as == 'object')
{
return (object)$returns;
}
else
{
return $returns;
}
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("MongoDB query failed: {$e->getMessage()}", 500);
}
else
{
show_error("MongoDB query failed.", 500);
}
}
}

public function get_where($collection = "", $where = array())
{
if (is_array($where) && count($where) > 0)
{
return $this->where($where)
->get($collection);
}
else
{
show_error("Nothing passed to perform search or value is empty.", 500);
}
}

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);
}

public function set($fields, $value = NULL)
{
$this->_u('$set');
if (is_string($fields))
{
$this->updates['$set'][$fields] = $value;
}
elseif (is_array($fields))
{
foreach ($fields as $field => $value)
{
$this->updates['$set'][$field] = $value;
}
}
return $this;
}

public function unset_field($fields)
{
$this->_u('$unset');
if (is_string($fields))
{
$this->updates['$unset'][$fields] = 1;
}
elseif (is_array($fields))
{
foreach ($fields as $field)
{
$this->updates['$unset'][$field] = 1;
}
}
return $this;
}
public function addtoset($field, $values)
{
$this->_u('$addToSet');
if (is_string($values))
{
$this->updates['$addToSet'][$field] = $values;
}
elseif (is_array($values))
{
$this->updates['$addToSet'][$field] = array('$each' => $values);
}
return $this;
}

public function push($fields, $value = array())
{
$this->_u('$push');
if (is_string($fields))
{
$this->updates['$push'][$fields] = $value;
}
elseif (is_array($fields))
{
foreach ($fields as $field => $value)
{
$this->updates['$push'][$field] = $value;
}
}
return $this;
}

public function pop($field)
{
$this->_u('$pop');
if (is_string($field))
{
$this->updates['$pop'][$field] = -1;
}
elseif (is_array($field))
{
foreach ($field as $pop_field)
{
$this->updates['$pop'][$pop_field] = -1;
}
}
return $this;
}

public function pull($field = "", $value = array())
{
$this->_u('$pull');
$this->updates['$pull'] = array($field => $value);
return $this;
}

public function rename_field($old, $new)
{
$this->_u('$rename');
$this->updates['$rename'] = array($old => $new);
return $this;
}

public function inc($fields = array(), $value = 0)
{
$this->_u('$inc');
if (is_string($fields))
{
$this->updates['$inc'][$fields] = $value;
}
elseif (is_array($fields))
{
foreach ($fields as $field => $value)
{
$this->updates['$inc'][$field] = $value;
}
}
return $this;
}
public function mul($fields = array(), $value = 0)
{
$this->_u('$mul');
if (is_string($fields))
{
$this->updates['$mul'][$fields] = $value;
}
elseif (is_array($fields))
{
foreach ($fields as $field => $value)
{
$this->updates['$mul'][$field] = $value;
}
}
return $this;
}

public function max($fields = array(), $value = 0)
{
$this->_u('$max');
if (is_string($fields))
{
$this->updates['$max'][$fields] = $value;
}
elseif (is_array($fields))
{
foreach ($fields as $field => $value)
{
$this->updates['$max'][$field] = $value;
}
}
return $this;
}
public function min($fields = array(), $value = 0)
{
$this->_u('$min');
if (is_string($fields))
{
$this->updates['$min'][$fields] = $value;
}
elseif (is_array($fields))
{
foreach ($fields as $field => $value)
{
$this->updates['$min'][$field] = $value;
}
}
return $this;
}

public function distinct($collection = "", $field="")
{
if (empty($collection))
{
show_error("No Mongo collection selected for update", 500);
}

if (empty($field))
{
show_error("Need Collection field information for performing distinct query", 500);
}

try
{
$documents = $this->db->{$collection}->distinct($field, $this->wheres);
$this->_clear();
if ($this->return_as == 'object')
{
return (object)$documents;
}
else
{
return $documents;
}
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("MongoDB Distinct Query Failed: {$e->getMessage()}", 500);
}
else
{
show_error("MongoDB failed", 500);
}
}
}

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

try
{
$options = array_merge($options, array('w' => $this->write_concerns, 'j'=>$this->journal, 'multiple' => FALSE));
$this->db->{$collection}->update($this->wheres, $this->updates, $options);
$this->_clear();
return (TRUE);
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Update of data into MongoDB failed: {$e->getMessage()}", 500);
}
else
{
show_error("Update of data into MongoDB failed", 500);
}
}
}

public function update_all($collection = "", $data = array(), $options = array())
{
if (empty($collection))
{
show_error("No Mongo collection selected to update", 500);
}
if (is_array($data) && count($data) > 0)
{
$this->updates = array_merge($data, $this->updates);
}
if (count($this->updates) == 0)
{
show_error("Nothing to update in Mongo collection or update is not an array", 500);
}
try
{
$options = array_merge($options, array('w' => $this->write_concerns, 'j'=>$this->journal, 'multiple' => TRUE));
$this->db->{$collection}->update($this->wheres, $this->updates, $options);
$this->_clear();
return (TRUE);
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Update of data into MongoDB failed: {$e->getMessage()}", 500);
}
else
{
show_error("Update of data into MongoDB failed", 500);
}
}
}

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('w' => $this->write_concerns, 'j'=>$this->journal, 'justOne' => TRUE));
$this->_clear();
return (TRUE);
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Delete of data into MongoDB failed: {$e->getMessage()}", 500);
}
else
{
show_error("Delete of data into MongoDB failed", 500);
}

}
}

public function delete_all($collection = "")
{
if (empty($collection))
{
show_error("No Mongo collection selected to delete from", 500);
}
if (isset($this->wheres['_id']) and ! is_object($this->wheres['_id']))
{
$this->wheres['_id'] = new MongoId($this->wheres['_id']);
}
try
{
$this->db->{$collection}->remove($this->wheres, array('w' => $this->write_concerns, 'j'=>$this->journal, 'justOne' => FALSE));
$this->_clear();
return (TRUE);
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Delete of data into MongoDB failed: {$e->getMessage()}", 500);
}
else
{
show_error("Delete of data into MongoDB failed", 500);
}
}
}

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

  if (empty($operation) && !is_array($operation))
{
show_error("Operation must be an array to perform aggregate.", 500);
}

try
{
$documents = $this->db->{$collection}->aggregate($operation);
$this->_clear();
if ($this->return_as == 'object')
{
return (object)$documents;
}
else
{
return $documents;
}
}
catch (MongoResultException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Aggregation operation failed: {$e->getMessage()}", 500);
}
else
{
show_error("Aggregation operation failed.", 500);
}
}
    }

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);
}


public function date($stamp = FALSE)
{
if ( $stamp == FALSE )
{
return new MongoDate();
}
else
{
return new MongoDate($stamp);
}

}

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


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

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;
}
}
try{
$this->db->{$collection}->createIndex($keys, $options);
$this->_clear();
return ($this);
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Creating Index failed : {$e->getMessage()}", 500);
}
else
{
show_error("Creating Index failed.", 500);
}
}
}


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);
}

try
{
$this->db->{$collection}->deleteIndex($keys, $options);
$this->_clear();
return ($this);
}
catch (MongoCursorException $e)
{
if(isset($this->debug) == TRUE && $this->debug == TRUE)
{
show_error("Creating Index failed : {$e->getMessage()}", 500);
}
else
{
show_error("Creating Index failed.", 500);
}
}
}


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());
}


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

$this->database = $database;

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

public function drop_db($database = '')
{
if (empty($database))
{
show_error('Failed to drop MongoDB database because name is empty', 500);
}

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


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

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

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

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

private function _u($method)
{
if ( ! isset($this->updates[$method]))
{
$this->updates[ $method ] = array();
}
}
}
Now open the file autoload.php inside the config folder and autoload the library.

$autoload['libraries'] = array('Mongo_db');
Thats it now you are connected and you can use mongoDB with codeigniter. Hope this article how to connect mongoDB with codeigniter will help you.


Entertainment: