如果能夠通過(guò)查詢條件查出每頁(yè)結(jié)果的最后一條記錄，在用最后一條記錄作為查詢條件去查下一頁(yè)，這樣每次都查詢頁(yè)面size條記錄，效率不會(huì)差。
?php
function show_error($message, $status_code = 500, $heading = 'An Error Was Encountered')
{
echo $message, $status_code,PHP_EOL;
exit;
}
//MongoDB操作類
class DB
{
private $CI;
private $config_file = 'MongoDB';
private $connection;
private $db;
private $connection_string;
private $collection = '';
private $host;
private $port;
private $user;
private $pass;
private $dbname;
private $key;
private $persist;
private $persist_key;
private $selects = array();
private $wheres = array();
private $sorts = array();
private $page_sorts = array();
private $limit = 999999;
private $offset = 0;
/**
* --------------------------------------------------------------------------------
* CONSTRUCTOR
* --------------------------------------------------------------------------------
*
* Automatically check if the Mongo PECL extension has been installed/enabled.
* Generate the connection string and establish a connection to the MongoDB.
*/
public function __construct($MONGODB_CONFIG)
{
if(!class_exists('Mongo'))
{
show_error("The MongoDB PECL extension has not been installed or enabled", 500);
}
/**
$config['mongo_host'] = '221.234.43.144';
$config['mongo_port'] = 27017;
$config['mongo_db'] = 'test';
$config['mongo_user'] = '';
$config['mongo_pass'] = '';
$config['mongo_persist'] = TRUE;
*
*/
$this->connection_string($MONGODB_CONFIG);
$this->connect();
}
/**
* --------------------------------------------------------------------------------
* Switch_db
* --------------------------------------------------------------------------------
*
* Switch from default database to a different db
*/
public function switch_db($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);
}
}
/**
* --------------------------------------------------------------------------------
* 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);
}
/**
* --------------------------------------------------------------------------------
* 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_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 = $this->mongo_db->where_between('foo', 20, 30);
*/
public function where_ne($field = "", $x)
{
$this->where_init($field);
$this->wheres[$field]['$ne'] = $x;
return($this);
}
/**
* --------------------------------------------------------------------------------
* WHERE OR
* --------------------------------------------------------------------------------
*
* Get the documents where the value of a $field is in one or more values
*
* @usage = $this->mongo_db->where_or('foo', array( 'foo', 'bar', 'blegh' );
*/
public function where_or($field = "", $values)
{
$this->where_init($field);
$this->wheres[$field]['$or'] = $values;
return($this);
}
/**
* --------------------------------------------------------------------------------
* WHERE AND
* --------------------------------------------------------------------------------
*
* Get the documents where the elements match the specified values
*
* @usage = $this->mongo_db->where_and( array ( 'foo' => 1, 'b' => 'someexample' );
*/
public function where_and( $elements_values = array() ) {
foreach ( $elements_values as $element => $val ) {
$this->wheres[$element] = $val;
}
return($this);
}
/**
* --------------------------------------------------------------------------------
* WHERE MOD
* --------------------------------------------------------------------------------
*
* Get the documents where $field % $mod = $result
*
* @usage = $this->mongo_db->where_mod( 'foo', 10, 1 );
*/
public function where_mod( $field, $num, $result ) {
$this->where_init($field);
$this->wheres[$field]['$mod'] = array ( $num, $result );
return($this);
}
/**
* --------------------------------------------------------------------------------
* Where size
* --------------------------------------------------------------------------------
*
* Get the documents where the size of a field is in a given $size int
*
* @usage : $this->mongo_db->where_size('foo', 1)->get('foobar');
*/
public function where_size($field = "", $size = "")
{
$this->_where_init($field);
$this->wheres[$field]['$size'] = $size;
return ($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(), $limit = 99999)
{
return($this->where($where)->limit($limit)->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);
$returns = array();
foreach($documents as $doc):
$returns[] = $doc;
endforeach;
$this->clear();
return($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);
}
/**
* 自增ID實(shí)現(xiàn)
* return insert_id
*/
private function insert_inc($table)
{
$update = array('$inc'=>array('id'=>1));
$query = array('table'=>$table);
$command = array(
'findandmodify'=>'_increase',
'update'=>$update,
'query'=>$query,
'new'=>true,
'upsert'=>true
);
$id = $this->db->command($command);
return $id['value']['id'];
}
/**
* --------------------------------------------------------------------------------
* INSERT
* --------------------------------------------------------------------------------
*
* Insert a new document into the passed collection
*
* @usage = $this->mongo_db->insert('foo', $data = array());
*/
public function insert($collection = "", $data = array()) {
if(empty($collection))
{
show_error("No Mongo collection selected to insert into", 500);
}
if(count($data) == 0 || !is_array($data))
{
show_error("Nothing to insert into Mongo collection or insert is not an array", 500);
}
try
{
$inc = $this->insert_inc($collection);
$data['_id'] = $inc;
$result = $this->db->{$collection}->insert($data, array('fsync' => TRUE));
if($result['ok'] || $result){
return true;
}
else{
return false;
}
}
catch(MongoCursorException $e)
{
show_error("Insert of data into MongoDB failed: {$e->getMessage()}", 500);
}
}
/**
* --------------------------------------------------------------------------------
* UPDATE
* --------------------------------------------------------------------------------
*
* Update a document into the passed collection
*
* @usage = $this->mongo_db->update('foo', $data = array());
*/
public function update($collection = "", $data = array(), $flage = false)
{
if(empty($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);
}
unset($data['_id']);
if($flage){
$arr = $this->wheres;
unset($arr['_id']);
if(is_array($arr)){
foreach($arr as $key => $w){
unset($data[$key]);
}
}
}
try
{
$res = $this->db->{$collection}->update($this->wheres, array('$set' => $data), array('fsync' => TRUE, 'multiple' => FALSE));
$this->clear();
return $res;
}
catch(MongoCursorException $e)
{
show_error("Update of data into MongoDB failed: {$e->getMessage()}", 500);
}
}
/**
* --------------------------------------------------------------------------------
* UPDATE_ALL
* --------------------------------------------------------------------------------
*
* Insert a new document into the passed collection
*
* @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('fsync' => 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, $where)
{
if(empty($collection))
{
show_error("No Mongo collection selected to delete from", 500);
}
if(!$where){
show_error("No data input to delete", 500);
}
try
{
$this->wheres = $where;
$this->db->{$collection}->remove($this->wheres);
$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('fsync' => TRUE, 'justOne' => FALSE));
$this->clear();
return(TRUE);
}
catch(MongoCursorException $e)
{
show_error("Delete of data into MongoDB failed: {$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());
}
/**
* --------------------------------------------------------------------------------
* DROP COLLECTION
* --------------------------------------------------------------------------------
*
* Removes the specified collection from the database. Be careful because this
* can have some very large issues in production!
*/
public function drop_collection($collection = "")
{
if(empty($collection))
{
show_error("No Mongo collection specified to drop from database", 500);
}
$this->db->{$collection}->drop();
return TRUE;
}
/**
* --------------------------------------------------------------------------------
* 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 $e)
{
show_error("Unable to connect to MongoDB: {$e->getMessage()}", 500);
}
}
/**
* --------------------------------------------------------------------------------
* BUILD CONNECTION STRING
* --------------------------------------------------------------------------------
*
* Build the connection string from the config file.
*/
private function connection_string($MONGODB_CONFIG)
{
$this->host = trim($MONGODB_CONFIG['HOST']);
$this->port = trim($MONGODB_CONFIG['PORT']);
$this->user = trim($MONGODB_CONFIG['USER']);
$this->pass = trim($MONGODB_CONFIG['PWD']);
$this->dbname = trim($MONGODB_CONFIG['DATABASE']);
$this->persist = trim($MONGODB_CONFIG['PERSIST']);
$this->persist_key = trim($MONGODB_CONFIG['PERSIST_KEY']);
$connection_string = "mongodb://";
if(empty($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}:{$this->port}/{$this->dbname}";
}
else
{
$connection_string .= "{$this->host}";
}
$this->connection_string = trim($connection_string);
}
/**
* --------------------------------------------------------------------------------
* CLEAR
* --------------------------------------------------------------------------------
*
* Resets the class variables to default settings
*/
private function clear()
{
$this->selects = array();
$this->wheres = array();
$this->limit = NULL;
$this->offset = NULL;
$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();
}
}
/**
* --------------------------------------------------------------------------------
* 設(shè)置表
* --------------------------------------------------------------------------------
* 參數(shù)：
* $table 表名
*/
public function set_table($table){
$this->collection = $table;
}
/**
* --------------------------------------------------------------------------------
* 獲取表名
* --------------------------------------------------------------------------------
*/
public function get_table(){
return $this->collection;
}
/**
* --------------------------------------------------------------------------------
* 設(shè)置表排序
* --------------------------------------------------------------------------------
* 參數(shù)：
* $orderby 排序
*/
public function set_orderby($orderby){
$this->page_sorts = $orderby;
}
/**
* --------------------------------------------------------------------------------
* 獲取左邊結(jié)果集
* --------------------------------------------------------------------------------
* 參數(shù)：
* $left 左邊顯示的個(gè)數(shù)
* $last 定位當(dāng)前頁(yè)的值
* $size 頁(yè)面大小
*/
public function get_left($left, $last, $size = PAGE_SIZE){
if($last){
$order = $this->nor_orderby();
if($this->page_sorts[$this->key] == -1){
$this->where_gt($this->key, $last);
} else {
$this->where_lt($this->key, $last);
}
return $this->limit($left * $size)->order_by($order)->get($this->collection);
}
}
/**
* --------------------------------------------------------------------------------
* 獲取右邊結(jié)果集
* --------------------------------------------------------------------------------
* 參數(shù)：
* $right 右邊顯示的個(gè)數(shù)
* $last 定位當(dāng)前頁(yè)的值
* $size 頁(yè)面大小
*/
public function get_right($right, $last, $size = PAGE_SIZE){
if($last){
if($this->page_sorts[$this->key] == -1){
$this->where_lte($this->key, $last);
} else {
$this->where_gte($this->key, $last);
}
}
return $this->limit($right * $size + 1)->order_by($this->page_sorts)->get($this->collection);
}
/**
* --------------------------------------------------------------------------------
* 設(shè)置key
* --------------------------------------------------------------------------------
* 參數(shù)：
* $key 設(shè)置索引主鍵
*/
public function set_key($key){
$this->key = $key;
}
/**
* --------------------------------------------------------------------------------
* 求反
* --------------------------------------------------------------------------------
*/
private function nor_orderby(){
foreach($this->page_sorts as $key => $order){
if($order == -1){
$orderby[$key] = 1;
}else{
$orderby[$key] = -1;
}
}
return $orderby;
}
/**
* --------------------------------------------------------------------------------
* 獲取上一頁(yè)的值
* --------------------------------------------------------------------------------
* 參數(shù)：
* $last 定位當(dāng)前頁(yè)的值
* $size 頁(yè)面大小
*/
public function get_prev($last, $size = PAGE_SIZE){
if($last){
if($this->page_sorts[$this->key] == 1){
$this->where_lt($this->key,$last)->order_by(array($this->key => -1));
} else {
$this->where_gt($this->key,$last)->order_by(array($this->key => 1));
}
$result = $this->limit($size)->get($this->collection);
}
return $result[$size - 1][$this->key];
}
/**
* --------------------------------------------------------------------------------
* 獲取下一頁(yè)的值
* --------------------------------------------------------------------------------
* 參數(shù)：
* $last 定位當(dāng)前頁(yè)的值
* $size 頁(yè)面大小
*/
public function get_next($last, $size = PAGE_SIZE){
if($last){
if($this->page_sorts[$this->key] == 1){
$this->where_gte($this->key,$last);
} else {
$this->where_lte($this->key,$last);
}
}
$result = $this->limit($size+1)->order_by($this->page_sorts)->get($this->collection);
return $result[$size][$this->key];
}
/**
* --------------------------------------------------------------------------------
* 獲取最后一頁(yè)的值
* --------------------------------------------------------------------------------
* 參數(shù)：
* $size 頁(yè)面大小
*/
public function get_last($size = PAGE_SIZE){
$res = $this->count($this->collection) % $size;
$order = $this->nor_orderby();
if($res > 0){
$result = $this->limit($res)->order_by($order)->get($this->collection);
return $result[$res - 1][$this->key];
}else{
$result = $this->limit($size)->order_by($order)->get($this->collection);
return $result[$size - 1][$this->key];
}
}
/**
* --------------------------------------------------------------------------------
* 分頁(yè)查詢
* --------------------------------------------------------------------------------
* 參數(shù)：
* $last 定位當(dāng)前頁(yè)的值
* $size 頁(yè)面大小
*/
public function page_query($last, $size = PAGE_SIZE){
if($last){
if($this->page_sorts[$this->key]==1){
$this->where_gte($this->key,$last);
} else {
$this->where_lte($this->key,$last);
}
}
return $this->limit($size)->order_by($this->page_sorts)->get($this->collection);
}
/**
* 批量執(zhí)行代碼_插入
* @param String $collection
* @param 二維數(shù)組 $code
*/
public function execute_insert($collection,$code){
//將二維數(shù)組分成js格式
$strcode='';
foreach($code as $k=>$v){
foreach($v as $kk=>$vv){
$strcode.='db.getCollection("'.$collection.'").insert({ "'.$kk.'":"'.$vv.'" });';
}
}
// retrun array([ok]=>1);
return $this->db->execute($code);
}
}
?>
