Topic: db class naudojimas kitose clasese

kaip panaudoti singleton klase kitoje klaseje buvau kaskada padares dabar nepadarau, naduju extract klase kaip pavizdys ca niekaip nesigauna.
index.php

<?php

 session_start();
  
 require_once 'config.php'; 
 require_once 'lib/database.php'; 
 
 
 $db = new Database(DB_SERVER, DB_USER, DB_PASS, DB_DATABASE);
 $db->connect();

 class extract{

    public $db;

    function __construct($server, $user, $pass, $database){ 
        $this->db = Database::obtain($server, $user, $pass, $database);
    }
    
    function rezult(){
        $row = $this->db->fetch_array("SELECT * FROM `menu`");
        echo $row['name'];
    }
 }
 
 $obj = new extract(DB_SERVER, DB_USER, DB_PASS, DB_DATABASE);

    $obj->rezult();

 $db->close();
  
?>

database.php

<?php
# Name: Database.singleton.php
# File Description: MySQL Singleton Class to allow easy and clean access to common mysql commands
# Author: ricocheting
# Web: http://www.ricocheting.com/
# Update: 2010-07-19
# Version: 3.1.4
# Copyright 2003 ricocheting.com


/*
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


//require("config.inc.php");
//$db = Database::obtain(DB_SERVER, DB_USER, DB_PASS, DB_DATABASE);

//$db = Database::obtain();


###################################################################################################
###################################################################################################
###################################################################################################
class Database{

    // debug flag for showing error messages
    public    $debug = true;

    // Store the single instance of Database
    private static $instance;

    private    $server   = ""; //database server
    private    $user     = ""; //database login name
    private    $pass     = ""; //database login password
    private    $database = ""; //database name

    private    $error = "";

    #######################
    //number of rows affected by SQL query
    public    $affected_rows = 0;

    private    $link_id = 0;
    private    $query_id = 0;


#-#############################################
# desc: constructor
public function __construct($server=null, $user=null, $pass=null, $database=null){
    // error catching if not passed in
    if($server==null || $user==null || $database==null){
        $this->oops("Database information must be passed in when the object is first created.");
    }

    $this->server=$server;
    $this->user=$user;
    $this->pass=$pass;
    $this->database=$database;
}#-#constructor()


#-#############################################
# desc: singleton declaration
public static function obtain($server=null, $user=null, $pass=null, $database=null){
    if (!self::$instance){ 
        self::$instance = new Database($server, $user, $pass, $database); 
    } 

    return self::$instance; 
}#-#obtain()


#-#############################################
# desc: connect and select database using vars above
# Param: $new_link can force connect() to open a new link, even if mysql_connect() was called before with the same parameters
public function connect($new_link=false){
    $this->link_id=@mysql_connect($this->server,$this->user,$this->pass,$new_link);

    if (!$this->link_id){//open failed
        $this->oops("Could not connect to server: <b>$this->server</b>.");
        }

    if(!@mysql_select_db($this->database, $this->link_id)){//no database
        $this->oops("Could not open database: <b>$this->database</b>.");
        }

    // unset the data so it can't be dumped
    $this->server='';
    $this->user='';
    $this->pass='';
    $this->database='';
}#-#connect()



#-#############################################
# desc: close the connection
public function close(){
    if(!@mysql_close($this->link_id)){
        $this->oops("Connection close failed.");
    }
}#-#close()


#-#############################################
# Desc: escapes characters to be mysql ready
# Param: string
# returns: string
public function escape($string){
    if(get_magic_quotes_runtime()) $string = stripslashes($string);
    return @mysql_real_escape_string($string,$this->link_id);
}#-#escape()


#-#############################################
# Desc: executes SQL query to an open connection
# Param: (MySQL query) to execute
# returns: (query_id) for fetching results etc
public function query($sql){
    // do query
    $this->query_id = @mysql_query($sql, $this->link_id);

    if (!$this->query_id){
        $this->oops("<b>MySQL Query fail:</b> $sql");
        return 0;
    }
    
    $this->affected_rows = @mysql_affected_rows($this->link_id);

    return $this->query_id;
}#-#query()


#-#############################################
# desc: does a query, fetches the first row only, frees resultset
# param: (MySQL query) the query to run on server
# returns: array of fetched results
public function query_first($query_string){
    $query_id = $this->query($query_string);
    $out = $this->fetch($query_id);
    $this->free_result($query_id);
    return $out;
}#-#query_first()


#-#############################################
# desc: fetches and returns results one line at a time
# param: query_id for mysql run. if none specified, last used
# return: (array) fetched record(s)
public function fetch($query_id=-1){
    // retrieve row
    if ($query_id!=-1){
        $this->query_id=$query_id;
    }

    if (isset($this->query_id)){
        $record = @mysql_fetch_assoc($this->query_id);
    }else{
        $this->oops("Invalid query_id: <b>$this->query_id</b>. Records could not be fetched.");
    }

    return $record;
}#-#fetch()


#-#############################################
# desc: returns all the results (not one row)
# param: (MySQL query) the query to run on server
# returns: assoc array of ALL fetched results
public function fetch_array($sql){
    $query_id = $this->query($sql);
    $out = array();

    while ($row = $this->fetch($query_id)){
        $out[] = $row;
    }

    $this->free_result($query_id);
    return $out;
}#-#fetch_array()


#-#############################################
# desc: does an update query with an array
# param: table, assoc array with data (not escaped), where condition (optional. if none given, all records updated)
# returns: (query_id) for fetching results etc
public function update($table, $data, $where='1'){
    $q="UPDATE `$table` SET ";

    foreach($data as $key=>$val){
        if(strtolower($val)=='null') $q.= "`$key` = NULL, ";
        elseif(strtolower($val)=='now()') $q.= "`$key` = NOW(), ";
        elseif(preg_match("/^increment\((\-?\d+)\)$/i",$val,$m)) $q.= "`$key` = `$key` + $m[1], "; 
        else $q.= "`$key`='".$this->escape($val)."', ";
    }

    $q = rtrim($q, ', ') . ' WHERE '.$where.';';

    return $this->query($q);
}#-#update()


#-#############################################
# desc: does an insert query with an array
# param: table, assoc array with data (not escaped)
# returns: id of inserted record, false if error
public function insert($table, $data){
    $q="INSERT INTO `$table` ";
    $v=''; $n='';

    foreach($data as $key=>$val){
        $n.="`$key`, ";
        if(strtolower($val)=='null') $v.="NULL, ";
        elseif(strtolower($val)=='now()') $v.="NOW(), ";
        else $v.= "'".$this->escape($val)."', ";
    }

    $q .= "(". rtrim($n, ', ') .") VALUES (". rtrim($v, ', ') .");";

    if($this->query($q)){
        return mysql_insert_id($this->link_id);
    }
    else return false;

}#-#insert()


#-#############################################
# desc: frees the resultset
# param: query_id for mysql run. if none specified, last used
private function free_result($query_id=-1){
    if ($query_id!=-1){
        $this->query_id=$query_id;
    }
    if($this->query_id!=0 && !@mysql_free_result($this->query_id)){
        $this->oops("Result ID: <b>$this->query_id</b> could not be freed.");
    }
}#-#free_result()

public function num_rows($q){
 $result = $this->query($q);
    $num_rows = mysql_num_rows($result);
    return $num_rows;
}

#-#############################################
# desc: throw an error message
# param: [optional] any custom error to display
private function oops($msg=''){
    if(!empty($this->link_id)){
        $this->error = mysql_error($this->link_id);
    }
    else{
        $this->error = mysql_error();
        $msg="<b>WARNING:</b> No link_id found. Likely not be connected to database.<br />$msg";
    }

    // if no debug, done here
    if(!$this->debug) return;
    ?>
        <table align="center" border="1" cellspacing="0" style="background:white;color:black;width:80%;">
        <tr><th colspan=2>Database Error</th></tr>
        <tr><td align="right" valign="top">Message:</td><td><?php echo $msg; ?></td></tr>
        <?php if(!empty($this->error)) echo '<tr><td align="right" valign="top" nowrap>MySQL Error:</td><td>'.$this->error.'</td></tr>'; ?>
        <tr><td align="right">Date:</td><td><?php echo date("l, F j, Y \a\\t g:i:s A"); ?></td></tr>
        <?php if(!empty($_SERVER['REQUEST_URI'])) echo '<tr><td align="right">Script:</td><td><a href="'.$_SERVER['REQUEST_URI'].'">'.$_SERVER['REQUEST_URI'].'</a></td></tr>'; ?>
        <?php if(!empty($_SERVER['HTTP_REFERER'])) echo '<tr><td align="right">Referer:</td><td><a href="'.$_SERVER['HTTP_REFERER'].'">'.$_SERVER['HTTP_REFERER'].'</a></td></tr>'; ?>
        </table>
    <?php
}#-#oops()


}//CLASS Database
###################################################################################################

?>

Re: db class naudojimas kitose clasese

šita klasė techniškai pasenusi dėl MYSQL extensiono, laikas atsinaujinti  :)

http://www.php.net/manual/en/mysqlinfo.api.choosing.php
http://www.php.net/manual/en/class.pdo.php
http://stackoverflow.com/questions/2033 … rn-in-php5

Kiek maigyklių sudėvėjai ?

3 (edited by morocco 2013-05-09 18:01:48)

Re: db class naudojimas kitose clasese

Gal galit parekomenduot ka naujo. Kokia class db.

Re: db class naudojimas kitose clasese

Tai imi mysqli arba PDO ir viskas, o jei reikia kokio papildomo funkcionalumo tai pagal poreikius pasirašai wrapper'į.

P.S. nepatingėk pasukti savo smegeninės, antraip niekur toli nenueisi.