Codeigniter MongoDB类库

$this->mongo_db->where_gte('age', 18)->where(array('country' => 'UK', 'can_drink' => TRUE))->get('people');

<?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'] = "";

// 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;

<?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($insert, array($this->query_safety     => TRUE));
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($this->query_safety => TRUE, '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
{
$this->connection = new Mongo($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