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File Name: MySqlConnection.php
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<?php
/**
Copyright 2011-2014 Nick Korbel

This file is part of Booked Scheduler.

Booked Scheduler 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.

Booked Scheduler 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 Booked Scheduler.  If not, see <http://www.gnu.org/licenses/>.
*/

class MySqlConnection implements IDbConnection
{
    private 
$_dbUser '';
    private 
$_dbPassword '';
    private 
$_hostSpec '';
    private 
$_dbName '';

    private 
$_db null;
    private 
$_connected false;

    
/**
     * @param string $dbUser
     * @param string $dbPassword
     * @param string $hostSpec
     * @param string $dbName
     */
    
public function __construct($dbUser$dbPassword$hostSpec$dbName)
    {
        
$this->_dbUser $dbUser;
        
$this->_dbPassword $dbPassword;
        
$this->_hostSpec $hostSpec;
        
$this->_dbName $dbName;
    }

    public function 
Connect()
    {
        if (
$this->_connected && !is_null($this->_db))
        {
            return;
        }

        
$this->_db mysqli_connect($this->_hostSpec$this->_dbUser$this->_dbPassword,$this->_dbName);
        
$selected mysqli_select_db($this->_db$this->_dbName);
        
mysqli_set_charset($this->_db'utf8');

        if (!
$this->_db || !$selected)
        {
            throw new 
Exception("Error connecting to database\nError: " mysql_error());
            
Log::Error("Error connecting to database\n%s",  mysql_error());
        }

        
$this->_connected true;
    }

    public function 
Disconnect()
    {
        
mysqli_close($this->_db);
        
$this->_db null;
        
$this->_connected false;
    }

    public function 
Query(ISqlCommand $sqlCommand)
    {
        
mysqli_set_charset($this->_dbResources::GetInstance()->Charset);
        
$mysqlCommand = new MySqlCommandAdapter($sqlCommand$this->_db);

        
Log::Sql('MySql Query: ' str_replace('%''%%'$mysqlCommand->GetQuery()));

        
$result mysqli_query($this->_db$mysqlCommand->GetQuery());

        
$this->_handleError($result);

        return new 
MySqlReader($result);
    }

    public function 
LimitQuery(ISqlCommand $command$limit$offset 0)
    {
        return 
$this->Query(new MySqlLimitCommand($command$limit$offset));
    }

    public function 
Execute(ISqlCommand $sqlCommand)
    {
        
mysqli_set_charset($this->_dbResources::GetInstance()->Charset);
        
$mysqlCommand = new MySqlCommandAdapter($sqlCommand$this->_db);

        
Log::Sql('MySql Execute: ' str_replace('%''%%'$mysqlCommand->GetQuery()));

        
$result mysqli_query($this->_db$mysqlCommand->GetQuery());

        
$this->_handleError($result);
    }

    public function 
GetLastInsertId()
    {
        return 
mysqli_insert_id($this->_db);
    }

    private function 
_handleError($result$sqlCommand null)
    {
        if (!
$result)
        {
            if (
$sqlCommand != null)
            {
                echo 
$sqlCommand->GetQuery();
            }
            throw new 
Exception('There was an error executing your query\n' .  mysql_error());

               
Log::Error("Error executing MySQL query %s",  mysql_error());
        }
        return 
false;
    }
}

class 
MySqlLimitCommand extends SqlCommand
{
    
/**
     * @var \ISqlCommand
     */
    
private $baseCommand;

    private 
$limit;
    private 
$offset;

    public function 
__construct(ISqlCommand $baseCommand$limit$offset)
    {
        
parent::__construct();

        
$this->baseCommand $baseCommand;
        
$this->limit $limit;
        
$this->offset $offset;

        
$this->Parameters $baseCommand->Parameters;
    }

    public function 
GetQuery()
    {
        return 
$this->baseCommand->GetQuery() . sprintf(" LIMIT %s OFFSET %s",  $this->limit$this->offset);
    }

}
?>

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