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<?php
/**
* Akeeba Engine
* The modular PHP5 site backup engine
* @copyright Copyright (c)2006-2017 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU GPL version 3 or, at your option, any later version
* @package akeebaengine
*
*/
namespace Akeeba\Engine\Driver\Query;
// Protection against direct access
defined('AKEEBAENGINE') or die();
/**
* Microsoft SQL Server query building class.
*
* Based on Joomla! Platform 11.3
*/
class Sqlsrv extends Base
{
/**
* The character(s) used to quote SQL statement names such as table names or field names,
* etc. The child classes should define this as necessary. If a single character string the
* same character is used for both sides of the quoted name, else the first character will be
* used for the opening quote and the second for the closing quote.
*
* @var string
*/
protected $name_quotes = '`';
/**
* The null or zero representation of a timestamp for the database driver. This should be
* defined in child classes to hold the appropriate value for the engine.
*
* @var string
*/
protected $null_date = '1900-01-01 00:00:00';
/**
* Magic function to convert the query to a string.
*
* @return string The completed query.
*/
public function __toString()
{
$query = '';
switch ($this->type)
{
case 'insert':
$query .= (string)$this->insert;
// Set method
if ($this->set)
{
$query .= (string)$this->set;
}
// Columns-Values method
elseif ($this->values)
{
if ($this->columns)
{
$query .= (string)$this->columns;
}
$elements = $this->insert->getElements();
$tableName = array_shift($elements);
$query .= 'VALUES ';
$query .= (string)$this->values;
if ($this->autoIncrementField)
{
$query = 'SET IDENTITY_INSERT ' . $tableName . ' ON;' . $query . 'SET IDENTITY_INSERT ' . $tableName . ' OFF;';
}
if ($this->where)
{
$query .= (string)$this->where;
}
}
break;
default:
$query = parent::__toString();
break;
}
return $query;
}
/**
* Casts a value to a char.
*
* Ensure that the value is properly quoted before passing to the method.
*
* @param string $value The value to cast as a char.
*
* @return string Returns the cast value.
*/
public function castAsChar($value)
{
return 'CAST(' . $value . ' as NVARCHAR(10))';
}
/**
* Gets the number of characters in a string.
*
* Note, use 'length' to find the number of bytes in a string.
*
* Usage:
* $query->select($query->charLength('a'));
*
* @param string $field A value.
* @param string $operator Comparison operator between charLength integer value and $condition
* @param string $condition Integer value to compare charLength with.
*
* @return string The required char length call.
*/
public function charLength($field, $operator = null, $condition = null)
{
if (empty($operator) && empty($condition))
{
$operator = 'IS NOT';
$condition = 'NULL';
}
return 'DATALENGTH(' . $field . ')' . (isset($operator) && isset($condition) ? ' ' . $operator . ' ' . $condition : '');
}
/**
* Concatenates an array of column names or values.
*
* @param array $values An array of values to concatenate.
* @param string $separator As separator to place between each value.
*
* @return string The concatenated values.
*/
public function concatenate($values, $separator = null)
{
if ($separator)
{
return '(' . implode('+' . $this->quote($separator) . '+', $values) . ')';
}
else
{
return '(' . implode('+', $values) . ')';
}
}
/**
* Gets the current date and time.
*
* @return string
*/
public function currentTimestamp()
{
return 'GETDATE()';
}
/**
* Get the length of a string in bytes.
*
* @param string $value The string to measure.
*
* @return integer
*/
public function length($value)
{
return 'LEN(' . $value . ')';
}
/**
* Add to the current date and time.
* Usage:
* $query->select($query->dateAdd());
* Prefixing the interval with a - (negative sign) will cause subtraction to be used.
*
* @param string $date The date (SQL formatted) to add to; type may be a string of a time or a datetime.
* @param string $interval The string representation of the appropriate number of units
* @param string $datePart The part of the date to perform the addition on
*
* @return string The string with the appropriate sql for addition of dates
*
* @note Not all drivers support all units.
* @link http://msdn.microsoft.com/en-us/library/ms186819.aspx for more information
*/
public function dateAdd($date, $interval, $datePart)
{
return "DATEADD('" . $datePart . "', '" . $interval . "', '" . $date . "'" . ')';
}
}
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