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<?php |
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namespace SilverStripe\MSSQL; |
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use InvalidArgumentException; |
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use SilverStripe\ORM\Queries\SQLSelect; |
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use SilverStripe\ORM\Connect\DBQueryBuilder; |
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use SilverStripe\ORM\Queries\SQLConditionalExpression; |
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use SilverStripe\ORM\Queries\SQLUpdate; |
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/** |
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* Builds a SQL query string from a SQLExpression object |
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*/ |
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class MSSQLQueryBuilder extends DBQueryBuilder |
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{ |
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protected function buildSelectQuery(SQLSelect $query, array &$parameters) |
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{ |
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list($limit, $offset) = $this->parseLimit($query); |
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// If not using ofset then query generation is quite straightforward |
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if (empty($offset)) { |
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$sql = parent::buildSelectQuery($query, $parameters); |
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// Inject limit into SELECT fragment |
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if (!empty($limit)) { |
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$sql = preg_replace('/^(SELECT (DISTINCT)?)/i', '${1} TOP '.$limit, $sql); |
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} |
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return $sql; |
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} |
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// When using offset we must use a subselect |
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// @see http://stackoverflow.com/questions/2135418/equivalent-of-limit-and-offset-for-sql-server |
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$orderby = $query->getOrderBy(); |
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// workaround for subselect not working with alias functions |
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// just use the function directly in the order by instead of the alias |
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$selects = $query->getSelect(); |
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foreach ($orderby as $field => $dir) { |
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if (preg_match('/_SortColumn/', $field)) { |
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unset($orderby[$field]); |
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$orderby[$selects[str_replace('"', '', $field)]] = $dir; |
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} |
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} |
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// Create order expression, using the first column if none explicitly specified |
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if ($orderby) { |
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// Simple implementation of buildOrderByFragment |
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$statements = array(); |
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foreach ($orderby as $clause => $dir) { |
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$statements[] = trim("$clause $dir"); |
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} |
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$orderByClause = "ORDER BY " . implode(', ', $statements); |
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} else { |
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$selects = $query->getSelect(); |
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$firstCol = reset($selects); |
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$orderByClause = "ORDER BY $firstCol"; |
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} |
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// Build main query SQL |
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$sql = parent::buildSelectQuery($query, $parameters); |
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// Inject row number into selection |
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$sql = preg_replace('/^(SELECT (DISTINCT)?)/i', '${1} ROW_NUMBER() OVER ('.$orderByClause.') AS Number, ', $sql); |
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// Sub-query this SQL |
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if (empty($limit)) { |
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$limitCondition = "Number > ?"; |
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$parameters[] = $offset; |
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} else { |
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$limitCondition = "Number BETWEEN ? AND ?"; |
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$parameters[] = $offset + 1; |
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$parameters[] = $offset + $limit; |
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} |
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return "SELECT * FROM ($sql) AS Numbered WHERE $limitCondition ORDER BY Number"; |
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} |
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public function buildLimitFragment(SQLSelect $query, array &$parameters) |
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{ |
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// Limit is handled at the buildSelectQuery level |
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return ''; |
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} |
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public function buildOrderByFragment(SQLSelect $query, array &$parameters) |
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{ |
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// If doing a limit/offset at the same time then don't build the orde by fragment here |
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list($offset, $limit) = $this->parseLimit($query); |
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if (empty($offset) || empty($limit)) { |
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return parent::buildOrderByFragment($query, $parameters); |
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} |
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return ''; |
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} |
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public function buildWhereFragment(SQLConditionalExpression $query, array &$parameters) |
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{ |
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// Get parameterised elements |
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$where = parent::buildWhereFragment($query, $parameters); |
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if (!$where) { |
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return ''; |
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} |
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// remove explict order in where |
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$where = preg_replace("/ORDER BY ([^\)])+ [ASC|DESC]+/", '', $where); |
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return $where; |
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} |
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/** |
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* Extracts the limit and offset from the limit clause |
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* |
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* @param SQLSelect $query |
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* @return array Two item array with $limit and $offset as values |
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* @throws InvalidArgumentException |
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*/ |
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protected function parseLimit(SQLSelect $query) |
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{ |
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$limit = ''; |
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$offset = '0'; |
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if (is_array($query->getLimit())) { |
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$limitArr = $query->getLimit(); |
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if (isset($limitArr['limit'])) { |
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$limit = $limitArr['limit']; |
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} |
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if (isset($limitArr['start'])) { |
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$offset = $limitArr['start']; |
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} |
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} elseif (preg_match('/^([0-9]+) offset ([0-9]+)$/i', trim($query->getLimit()), $matches)) { |
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$limit = $matches[1]; |
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$offset = $matches[2]; |
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} else { |
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//could be a comma delimited string |
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$bits = explode(',', $query->getLimit()); |
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if (sizeof($bits) > 1) { |
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list($offset, $limit) = $bits; |
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} else { |
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$limit = $bits[0]; |
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} |
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} |
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return array($limit, $offset); |
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} |
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} |
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silverstripe /
silverstripe-mssql
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.