abstracte data layer - Abstracte data layer - Snippets - PHP scripts

Code (php)

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<?php

 class QueryDB implements Iterator {

 private static $QUOTE_MATCH = "/(\".*(?<!\\\)\")|('.*(?<!\\\)')/Ue";

 private $stored_procedure = false;
 private $quote_store;
 private $query_strings = array();

 private $row;
 private $current;

 protected $database;
 protected $result;
 protected $compiled_query;
 protected $query;

 public function __construct( IDB $database ) {
 $this->database = $database;
 $this->row = 0;
 }

 public function __get( $attribute ) {
 $attribute_function = 'get_' . $attribute;

 if ( method_exists($this, $attribute_function ) ) {
 return $this->$attribute_function();

 } else {
 throw new Exception('Undefined attribute called '.get_class($this).'::'.$attribute);

 }
 }

 public function __set( $attribute, $value ) {

 $attribute_function = 'set_' . $attribute;

 if ( method_exists($this, $attribute_function ) ) {
 return $this->$attribute_function($value);

 } else {

 if ( method_exists($this, 'get_' . $attribute ) ) {
 throw new Exception('Read-only attribute called for writing: '.get_class($this).'::'.$attribute);

 } else {
 throw new Exception('Undefined attribute called '.get_class($this).'::'.$attribute);

 }

 }

 }

 private function get_database() { return $this->database; }
 private function get_compiled_query() { return $this->compiled_query; }

 public function prepare( $query ) {
 $this->stored_procedure = true;
 $this->quote_store = array();
 $this->query = preg_replace(self::$QUOTE_MATCH, '$this->sql_quote_replace("\1"?"\1":\'\2\')', $query);
 }

 public function compile($params = '') {

 if (! $this->stored_procedure) {
 throw new Exception("Stored procedure has not been initialized");
 }

 $params = func_get_args();
 $query = preg_replace("/(?<!\\\\)\:(\d+)([SINC])/e", '$this->compile_callback($params, \1, "\2")', $this->query);

 return ($this->compiled_query = $this->add_strings($query));
 }

 public function execute($queryParams = ''){

 $args = func_get_args();

 if ($this->stored_procedure) {
 $query = call_user_func_array(array($this, 'compile'), $args);

 } else {
 $this->compiled_query = $queryParams;
 $query = $queryParams;

 }

 $result = $this->database->query($query);

 if (! $result ) {
 throw new QueryException($this);

 }

 $this->result = $result;
 return $this;

 }

 private function sql_quote_replace( $match ) {
 $number = count($this->query_strings);
 $this->query_strings[] = $match;
 return "$||$$number";
 }

 private function add_strings($string){
 $numbers = array_keys($this->query_strings);
 $count = count($numbers);

 $searches = array();

 for($x = 0; $x < $count; $x++) {
 $searches[$x] = "$||\${$numbers[$x]}";
 }

 return str_replace($searches, $this->query_strings, $string);
 }

 protected function compile_callback($params, $index, $type) {
 $index--;

 if (! isset($params[$index])) {
 throw new Exception("Required number of arguments not sent to stored procedure.");
 }


 switch ($type) {
 case 'S':
 if ( is_array ( $params[$index] ) ) {
 return "(" . $this->implode_with_security(", ",$params[$index], array($this->database, 'escape_string'), true) . ")";

 } else {
 return '\'' . $this->database->escape_string($params[$index]) . '\'';

 }

 break;

 case 'I':
 if ( is_array ( $params[$index] ) ) {
 return "(" . implode(", ",$params[$index]) . ")";

 } else {
 return (int) $params[$index];

 }

 break;

 case 'N':
 if ( is_array ( $params[$index] ) ) {
 return "(" . implode(", ",$params[$index]) . ")";

 } else {
 return (float) $params[$index];

 }

 break;

 case 'C':
 if ( is_array ( $params[$index] ) ) {
 return $this->implode_with_security(", ",$params[$index], array($this->database, 'escape_string'), false);

 } else {
 return $params[$index];

 }

 default:
 throw new Exception("Unrecognised data type '$type' specified in stored procedure.");
 }
 }

 public function fetch_array() {
 $this->evaluate_result();
 return $this->database->fetch_array($this->result);
 }

 public function fetch_row() {
 $this->evaluate_result();
 return $this->database->fetch_row($this->result);
 }

 public function fetch_assoc() {
 $this->evaluate_result();
 return $this->database->fetch_assoc($this->result);
 }

 public function fetch_object() {
 $this->evaluate_result();
 return $this->database->fetch_object($this->result);
 }

 public function getNumRows() {
 $this->evaluate_result();
 return $this->database->getNumRows($this->result);
 }

 public function seekRow( $row = 0 ) {
 $this->evaluate_result();

 if ( $row < $this->getNumRows() ) {
 $this->database->seekRow($this->result, $row);
 }
 }

 public function fill_object ( $object ) {

 $row = $this->fetch_assoc();

 $keys = array_keys($row);

 if ( isset ( $object->overrule ) && is_array($object->overrule) ) {

 foreach ( $keys as $key ) {

 if ( array_key_exists ($key, $object->overrule ) ){
 $object->{$object->overrule[$key]} = $row[$key];

 } else {
 $object->{$key} = $row[$key];

 }
 }

 } else {

 foreach ( $keys as $key ) {
 $object->{$key} = $row[$key];
 }

 }

 }

 private function evaluate_result() {
 if (! is_resource($this->result)) {
 throw new Exception('Query not executed.');
 }

 }

 private function implode_with_security ( $glue, array $array, $func_escape, $quotes = true ) {

 $t = '';

 if ( $quotes ) {
 $quote = "'";
 } else {
 $quote = '';
 }

 foreach ( $array as $value ) {
 $t .= $glue . $quote . call_user_func($func_escape,$value) . $quote;
 }

 $t = substr($t, strlen($glue),strlen($t));

 return $t;

 }

 // Iterator Implementation
 public function current() {
 $this->seekRow($this->row);
 $this->current = $this->fetch_assoc();

 return $this->current;
 }

 public function rewind() {
 $this->current = NULL;
 $this->row = 0;
 $this->seekRow($this->row);
 }

 public function key() {
 return $this->row;
 }

 public function next() {
 $this->row++;
 $var = $this->fetch_assoc();
 return $var;
 }

 public function valid() {
 return $this->current !== false;
 }

 }

?>

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<?php

 class MySQLDB implements IDB {

 private $con_id;

 private $db;
 private $host;
 private $user;
 private $password;

 private $query_count;

 public function __construct( $host, $user, $password, $database = '' ) {

 $this->host = $host;
 $this->user = $user;
 $this->password = $password;

 $this->connect();

 if ( strlen($database) > 0 ) {
 $this->set_db($database);
 }

 }

 public function __destruct() {
 }

 public function __get( $attribute ) {
 $attribute_function = 'get_' . $attribute;

 if ( method_exists($this, $attribute_function ) ) {
 return $this->$attribute_function();

 } else {

 if ( method_exists($this, 'set_' . $attribute ) ) {
 throw new Exception(get_class($this) . '::' . $attribute . ' is write-only');

 } else {
 throw new Exception( get_class($this) . '::' . $attribute . ' undifined');

 }

 }
 }

 public function __set( $attribute, $value ) {

 $attribute_function = 'set_' . $attribute;

 if ( method_exists($this, $attribute_function ) ) {
 return $this->$attribute_function($value);

 } else {

 if ( method_exists($this, 'get_' . $attribute ) ) {
 throw new Exception( get_class($this) . '::' . $attribute . ' is read-only');

 } else {
 throw new Exception(get_class($this) . '::' . $attribute . ' undifined');

 }

 }

 }

 public static function getInstance( $host, $user, $password, $database = '' ) {
 static $old;

 if ( ! isset ( $old ) ) {
 $object = __CLASS__;
 $old = new $object( $host, $user, $password, $database );
 }

 return $old;
 }

 private function get_db() { return $this->db; }
 private function get_host() { return $this->host; }
 private function get_user() { return $this->user; }

 private function set_host ( $host ) { $this->host = $host; }
 private function set_user ( $user ) { $this->user = $user; }
 private function set_password ( $pass ) { $this->password = $pass; }

 private function set_db( $db ) {

 $this->db = $db;

 if ( ! mysql_select_db( $db, $this->con_id ) ) {
 throw new Exception("Unable to select database");
 }

 }

 public function connect() {

 if ( ! $this->con_id = mysql_connect( $this->host, $this->user, $this->password ) ) {
 throw new Exception("Unable to connect to the MySQL database");
 }

 }

 public function disconnect() {

 if ( ! is_null ( $this->con_id ) ) {
 if ( ! mysql_close( $this->con_id ) ) {
 throw new Exception("Unable to close connection");
 }

 $this->con_id = NULL;
 }

 }

 public function getLastInsertId() {

 if( ! $id = mysql_insert_id( $this->con_id ) ){
 throw new Exception("Unable to get last insertion id");

 }

 return $id;
 }

 public function newQuery() {
 return new QueryDB( $this );
 }

 public function getQueryCount() {
 return $this->query_count;
 }

 public function getAffectedNumRows() {

 $rows = mysql_affected_rows($this->con_id);
 return $rows == 0 ? false : $rows;

 }

 public function getNumRows( $result ) {

 if( ! $rows = mysql_num_rows( $result ) ){
 return false;
 }

 return $rows;
 }

 public function getErrorNumber() {
 return mysql_errno($this->con_id);
 }

 public function getError() {
 return mysql_error($this->con_id);
 }

 public static function escape_string( $string ) {
 return mysql_real_escape_string( $string );
 }

 public function fetch_array( $result, $array_type = MYSQL_BOTH ) {
 return mysql_fetch_array( $result, $array_type );
 }

 public function fetch_row( $result ) {
 return mysql_fetch_row( $result );
 }

 public function fetch_assoc( $result ) {
 return mysql_fetch_assoc( $result );
 }

 public function fetch_object( $result ) {
 return mysql_fetch_object( $result );
 }

 public function query($query){
 $this->query_count++;
 return mysql_query($query, $this->con_id);
 }

 public function seekRow ( $result, $row = 0 ) {
 return mysql_data_seek($result, $row);
 }

 }

?>

Code (php)

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<?php

 interface IDB {

 public function connect();
 public function disconnect();

 public static function getInstance( $host, $user, $password );

 public function getLastInsertId();
 public function newQuery();

 public function query( $query );

 public function getQueryCount();

 public function getAffectedNumRows();
 public function getNumRows( $result );

 public function getErrorNumber();
 public function getError();

 public static function escape_string( $string );

 public function fetch_array( $result );
 public function fetch_row( $result );
 public function fetch_assoc( $result );
 public function fetch_object( $result );

 public function seekRow( $row );
 }

?>

Code (php)

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<?php

 class QueryException extends Exception {

 protected $query;

 protected $query_text;
 protected $error_number;
 protected $error_message;

 protected $debug = false;

 public function __construct( QueryDB $query, $debug = false ) {

 $this->query = $query;

 $backtrace = $this->GetTrace();

 if (count($backtrace) > 0) {
 $x = 0;

 while((! isset($backtrace[$x]['line'])) ||
 (isset($backtrace[$x]['class']) && is_subclass_of($backtrace[$x]['class'], 'QueryDB')) ||
 (strpos(strtolower(@$backtrace[$x]['function']), 'call_user_func')) !== false ) {

 ++$x;

 if (($x) >= count($backtrace)) {
 $x = count($backtrace);
 break;
 }
 }

 if ($x != 0) {
 $x -= 1;
 }

 $this->line = $backtrace[$x]['line'];
 $this->file = $backtrace[$x]['file'];
 }

 $this->query_text = $query->compiled_query;
 $this->error_number = $query->database->getErrorNumber();
 $this->error_message = $query->database->getError();

 parent::__construct('Query Error', 0);

 }

 public function __destruct() {
 }

 public function __get ( $attribute ) {

 $attribute_function = 'get_' . $attribute;

 if ( method_exists($this, $attribute_function ) ) {
 return $this->$attribute_function();

 } else {
 throw new Exception('Undefined attribute called '.get_class($this).'::'.$attribute);

 }
 }

 public function __set( $attribute, $value ) {

 $attribute_function = 'set_' . $attribute;

 if ( method_exists($this, $attribute_function ) ) {
 return $this->$attribute_function($value);

 } else {

 if ( method_exists($this, 'get_' . $attribute ) ) {
 throw new Exception('Read-only attribute called for writing: '.get_class($this).'::'.$attribute);

 } else {
 throw new Exception('Undefined attribute called '.get_class($this).'::'.$attribute);

 }

 }

 }

 public function __toString() {

 if ( $this->debug ) {
 $output = "Query Error in {$this->file} on line {$this->line} \r\n\r\n";
 $output .= "Query: {$this->query_text} \r\n\r\n";
 $output .= "Error: {$this->error_message} ({$this->error_number})\n\n";

 } else {
 $output = "An error has occured during query executing. \r\n" ;
 $output .= "We are sorry for the inconvenience and we will restore it asap.";

 }

 return $output;
 }

 private function get_query_text() { return $this->query_text; }
 private function get_error_number() { return $this->error_number; }
 private function get_error_message() { return $this->error_message; }

 private function get_debug() { return $this->debug; }
 private function set_debug( $debug ) { $this->debug = $debug; }

 }

?>

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<?php

 function __autoload( $class ) {
 require ('class.' . $class . '.php');
 }

 $connection = MySQLDB::getInstance($host,$user,$password,$database);
 $query = $connection->newQuery();

 $query->prepare('SELECT id, username FROM users
 WHERE username = :1S OR id = :2I OR id IN :3I
 OR username IN :3I ORDER BY id ASC');

 try {
 $query->execute('test', 4, array(1,2,6,9,12,14,36));

 } catch (QueryException $e) {
 $e->debug = true;
 echo($e);

 }

 foreach ( $query as $t) {
 print_r($t);
 }

?>

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