ezSQL CLASS;
PHP Kodu:ez_sql_mysql.php
<?php
/**********************************************************************
* Author: Justin Vincent (justin@visunet.ie)
* Web...: http://php.justinvincent.com
* Name..: ezSQL_mysql
* Desc..: mySQL component (part of ezSQL databse abstraction library)
*
*/
/**********************************************************************
* ezSQL error strings - mySQL
*/
$ezsql_mysql_str = array
(
1 => 'Require $dbuser and $dbpassword to connect to a database server',
2 => 'Error establishing mySQL database connection. Correct user/password? Correct hostname? Database server running?',
3 => 'Require $dbname to select a database',
4 => 'mySQL database connection is not active',
5 => 'Unexpected error while trying to select database'
);
/**********************************************************************
* ezSQL Database specific class - mySQL
*/
if ( ! function_exists ('mysql_connect') ) die('<b>Fatal Error:</b> ezSQL_mysql requires mySQL Lib to be compiled and or linked in to the PHP engine');
if ( ! class_exists ('ezSQLcore') ) die('<b>Fatal Error:</b> ezSQL_mysql requires ezSQLcore (ez_sql_core.php) to be included/loaded before it can be used');
class ezSQL_mysql extends ezSQLcore
{
var $dbuser = false;
var $dbpassword = false;
var $dbname = false;
var $dbhost = false;
/**********************************************************************
* Constructor - allow the user to perform a qucik connect at the
* same time as initialising the ezSQL_mysql class
*/
function ezSQL_mysql($dbuser='', $dbpassword='', $dbname='', $dbhost='localhost')
{
$this->dbuser = $dbuser;
$this->dbpassword = $dbpassword;
$this->dbname = $dbname;
$this->dbhost = $dbhost;
}
/**********************************************************************
* Short hand way to connect to mySQL database server
* and select a mySQL database at the same time
*/
function quick_connect($dbuser='', $dbpassword='', $dbname='', $dbhost='localhost')
{
$return_val = false;
if ( ! $this->connect($dbuser, $dbpassword, $dbhost,true) ) ;
else if ( ! $this->select($dbname) ) ;
else $return_val = true;
return $return_val;
}
/**********************************************************************
* Try to connect to mySQL database server
*/
function connect($dbuser='', $dbpassword='', $dbhost='localhost')
{
global $ezsql_mysql_str; $return_val = false;
// Must have a user and a password
if ( ! $dbuser )
{
$this->register_error($ezsql_mysql_str[1].' in '.__FILE__.' on line '.__LINE__);
$this->show_errors ? trigger_error($ezsql_mysql_str[1],E_USER_WARNING) : null;
}
// Try to establish the server database handle
else if ( ! $this->dbh = @mysql_connect($dbhost,$dbuser,$dbpassword,true) )
{
$this->register_error($ezsql_mysql_str[2].' in '.__FILE__.' on line '.__LINE__);
$this->show_errors ? trigger_error($ezsql_mysql_str[2],E_USER_WARNING) : null;
}
else
{
$this->dbuser = $dbuser;
$this->dbpassword = $dbpassword;
$this->dbhost = $dbhost;
$return_val = true;
}
return $return_val;
}
/**********************************************************************
* Try to select a mySQL database
*/
function select($dbname='')
{
global $ezsql_mysql_str; $return_val = false;
// Must have a database name
if ( ! $dbname )
{
$this->register_error($ezsql_mysql_str[3].' in '.__FILE__.' on line '.__LINE__);
$this->show_errors ? trigger_error($ezsql_mysql_str[3],E_USER_WARNING) : null;
}
// Must have an active database connection
else if ( ! $this->dbh )
{
$this->register_error($ezsql_mysql_str[4].' in '.__FILE__.' on line '.__LINE__);
$this->show_errors ? trigger_error($ezsql_mysql_str[4],E_USER_WARNING) : null;
}
// Try to connect to the database
else if ( !@mysql_select_db($dbname,$this->dbh) )
{
// Try to get error supplied by mysql if not use our own
if ( !$str = @mysql_error($this->dbh))
$str = $ezsql_mysql_str[5];
$this->register_error($str.' in '.__FILE__.' on line '.__LINE__);
$this->show_errors ? trigger_error($str,E_USER_WARNING) : null;
}
else
{
$this->dbname = $dbname;
$return_val = true;
}
return $return_val;
}
/**********************************************************************
* Format a mySQL string correctly for safe mySQL insert
* (no mater if magic quotes are on or not)
*/
function escape($str)
{
return mysql_escape_string(stripslashes($str));
}
/**********************************************************************
* Return mySQL specific system date syntax
* i.e. Oracle: SYSDATE Mysql: NOW()
*/
function sysdate()
{
return 'NOW()';
}
/**********************************************************************
* Perform mySQL query and try to detirmin result value
*/
function query($query)
{
// Initialise return
$return_val = 0;
// Flush cached values..
$this->flush();
// For reg expressions
$query = trim($query);
// Log how the function was called
$this->func_call = "\$db->query(\"$query\")";
// Keep track of the last query for debug..
$this->last_query = $query;
// Count how many queries there have been
$this->num_queries++;
// Use core file cache function
if ( $cache = $this->get_cache($query) )
{
return $cache;
}
// If there is no existing database connection then try to connect
if ( ! isset($this->dbh) || ! $this->dbh )
{
$this->connect($this->dbuser, $this->dbpassword, $this->dbhost);
$this->select($this->dbname);
}
// Perform the query via std mysql_query function..
$this->result = @mysql_query($query,$this->dbh);
// If there is an error then take note of it..
if ( $str = @mysql_error($this->dbh) )
{
$is_insert = true;
$this->register_error($str);
$this->show_errors ? trigger_error($str,E_USER_WARNING) : null;
return false;
}
// Query was an insert, delete, update, replace
$is_insert = false;
if ( preg_match("/^(insert|delete|update|replace)\s+/i",$query) )
{
$this->rows_affected = @mysql_affected_rows();
// Take note of the insert_id
if ( preg_match("/^(insert|replace)\s+/i",$query) )
{
$this->insert_id = @mysql_insert_id($this->dbh);
}
// Return number fo rows affected
$return_val = $this->rows_affected;
}
// Query was a select
else
{
// Take note of column info
$i=0;
while ($i < @mysql_num_fields($this->result))
{
$this->col_info[$i] = @mysql_fetch_field($this->result);
$i++;
}
// Store Query Results
$num_rows=0;
while ( $row = @mysql_fetch_object($this->result) )
{
// Store relults as an objects within main array
$this->last_result[$num_rows] = $row;
$num_rows++;
}
@mysql_free_result($this->result);
// Log number of rows the query returned
$this->num_rows = $num_rows;
// Return number of rows selected
$return_val = $this->num_rows;
}
// disk caching of queries
$this->store_cache($query,$is_insert);
// If debug ALL queries
$this->trace || $this->debug_all ? $this->debug() : null ;
return $return_val;
}
}
?>PHP Kodu:#disk_cache_example.php
<?php
// Standard ezSQL Libs
include_once "../shared/ez_sql_core.php";
include_once "ez_sql_mysql.php";
// Initialise singleton
$db = new ezSQL_mysql('db_user', 'db_pass', 'db_name');
// Cache expiry
$db->cache_timeout = 24; // Note: this is hours
// Specify a cache dir. Path is taken from calling script
$db->cache_dir = 'ezsql_cache';
// (1. You must create this dir. first!)
// (2. Might need to do chmod 775)
// Global override setting to turn disc caching off
// (but not on)
$db->use_disk_cache = true;
// By wrapping up queries you can ensure that the default
// is NOT to cache unless specified
$db->cache_queries = true;
// At last.. a query!
$db->get_results("SHOW TABLES");
$db->debug();
// Select * from use
$db->get_results("SELECT * FROM User");
$db->debug();
// This ensures only the above querys are cached
$db->cache_queries = false;
// This query is NOT cached
$db->get_results("SELECT * FROM User LIMIT 0,1");
$db->debug();
/*
Of course, if you want to cache EVERYTHING just do..
$db = new ezSQL_mysql('db_user', 'db_pass', 'db_name');
$db->use_disk_cache = true;
$db->cache_queries = true;
$db->cache_timeout = 24;
*/
?>PHP Kodu:#demo.php
<?php
/**********************************************************************
* ezSQL initialisation for mySQL
*/
// Include ezSQL core
include_once "../shared/ez_sql_core.php";
// Include ezSQL database specific component
include_once "ez_sql_mysql.php";
// Initialise database object and establish a connection
// at the same time - db_user / db_password / db_name / db_host
$db = new ezSQL_mysql('db_user','db_password','db_name','db_host');
/**********************************************************************
* ezSQL demo for mySQL database
*/
// Demo of getting a single variable from the db
// (and using abstracted function sysdate)
$current_time = $db->get_var("SELECT " . $db->sysdate());
print "ezSQL demo for mySQL database run @ $current_time";
// Print out last query and results..
$db->debug();
// Get list of tables from current database..
$my_tables = $db->get_results("SHOW TABLES",ARRAY_N);
// Print out last query and results..
$db->debug();
// Loop through each row of results..
foreach ( $my_tables as $table )
{
// Get results of DESC table..
$db->get_results("DESC $table[0]");
// Print out last query and results..
$db->debug();
}
?>


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