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  Classes of Mertol  >  Reduced MySQLi  >  example.php  >  Download  
File: example.php
Role: Example script
Content type: text/plain
Description: Example along with explanations
Class: Reduced MySQLi
MySQLi database access wrapper
Author: By
Last change:
Date: 6 years ago
Size: 3,481 bytes
 

Contents

Class file image Download
<?php
 
/*load the files*/
 
require_once "DB.php";
  require_once
"DB_Connect.php";
 
 
/*
 * Here is are some example of usage
 * The table that we are working on has the following columns with auto increment on id:
 * id | username | password | real_name
 *
 */
 
 
$db = new DB(); // create the object
 
  /*
  * ######This class runs ONLY Parameterized SQL Queries#####
  */
 
 
 
 
  /*
  * WHAT IS PARAMETERIZED QUERY?
  *
  * Roughly, on parameterized queries the structure of the query is seperated from the parameters;
  * It helps you improve:
  * Security since SQL Injections are no more possible,
  * Performance since parameterized are chached
  * Organization and Maintance since the stucture is seperated from the data
  *
  *
  * How to prepare Parameterized Queries?
  *
  * Well, it is not that different; The only thing is, that instead writing the variables inside the query
  * you put ? as place holder.
  * NOTE: You can't put ? as place holder for table name,column name or statements and etc.
  *
  * If you are confused, just look at the examples, its easy.
  *
  */
 
 
  //Here is the query, instead of writing a number for limit, we just put ? as placeholder
 
$query = "SELECT * FROM users LIMIT ?";
 
 
//And here is how to run it. 1.st parameter in $db->query() is the SQL query itself, and the 2.nd is the value for ?
 
$db->query($query,10); // This is equal to: SELECT * FROM users LIMIT 10
 
  //You can have as many parameters as you want. Just put ? as place holder and then add a parameter for every ? in the same order
 
$db->query("SELECT * FROM users WHERE username = ? AND password = ? AND real_name = ? LIMIT ?","root","thepassword","smith",1);
 
 
//You don't have to put ? for every parameter.
 
$real_name = "smith";
 
$db->query("SELECT * FROM users WHERE real_name = ? LIMIT 1",$real_name);
 
 
//$db->query() Will return the result of the query as associated array
  
$result = $db->query("SELECT * FROM users LIMIT ?",10);
  
?><pre><?
   ?>
<br /><br />$result:<?
   print_r
($result);
   
 
//You can get the number of selected,inserted,deleted or updated rows in last query just like that:
 
$number_rows_for_the_last_query = $db->num_rows;
 
 
?><br /><br />$number_rows_for_the_last_query:<?
 
print($number_rows_for_the_last_query);
 
 
//OR you can run the query instantly and get the number:
 
$number_rows_for_the_query = $db->num_rows("SELECT * FROM users LIMIT ?",10);
 
 
?><br /><br />$number_rows_for_the_query:<?
 
print($number_rows_for_the_query);
 
 
//It works for insert,update and delete too:
 
$number_of_inserted_rows = $db->num_rows("INSERT INTO users(id,username,password,real_name) VALUES(NULL,?,?,?)",'smith123','qwerty','smith john');
 
 
?><br /><br />$number_of_inserted_rows:<?
 
print($number_of_inserted_rows);
 
 
// AND get the last insert id from the auto increment for the last query:
 
$last_insert_id = $db->insert_id;
 
 
?><br /><br />$last_insert_id:<?
 
print($last_insert_id);
 
 
// OR run the query and get the last insert id directly:
 
$last_insert_id = $db->insert_id("INSERT INTO users(id,username,password,real_name) VALUES(NULL,?,?,?)",'smith123','qwerty','smith john');
 
 
?><br /><br />$last_insert_id:<?
 
print($last_insert_id."<br />");
 
 
/*And lets see what is in the log*/
 
 
print_r($db->log);
  
 
?>
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