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<?php |
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namespace Doctrine\DBAL\Platforms; |
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use Doctrine\DBAL\Schema\Sequence; |
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use const PREG_OFFSET_CAPTURE; |
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use function preg_match; |
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use function preg_match_all; |
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use function sprintf; |
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use function substr_count; |
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/** |
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* Platform to ensure compatibility of Doctrine with Microsoft SQL Server 2012 version. |
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* |
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* Differences to SQL Server 2008 and before are that sequences are introduced, |
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* and support for the new OFFSET... FETCH syntax for result pagination has been added. |
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* |
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* @author Steve Müller <[email protected]> |
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*/ |
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class SQLServer2012Platform extends SQLServerPlatform |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getAlterSequenceSQL(Sequence $sequence) |
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{ |
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return 'ALTER SEQUENCE ' . $sequence->getQuotedName($this) . |
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' INCREMENT BY ' . $sequence->getAllocationSize(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getCreateSequenceSQL(Sequence $sequence) |
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{ |
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return 'CREATE SEQUENCE ' . $sequence->getQuotedName($this) . |
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' START WITH ' . $sequence->getInitialValue() . |
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' INCREMENT BY ' . $sequence->getAllocationSize() . |
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' MINVALUE ' . $sequence->getInitialValue(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getDropSequenceSQL($sequence) |
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{ |
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if ($sequence instanceof Sequence) { |
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$sequence = $sequence->getQuotedName($this); |
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} |
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return 'DROP SEQUENCE ' . $sequence; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getListSequencesSQL($database) |
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{ |
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return 'SELECT seq.name, |
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CAST( |
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seq.increment AS VARCHAR(MAX) |
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) AS increment, -- CAST avoids driver error for sql_variant type |
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CAST( |
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seq.start_value AS VARCHAR(MAX) |
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) AS start_value -- CAST avoids driver error for sql_variant type |
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FROM sys.sequences AS seq'; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getSequenceNextValSQL($sequenceName) |
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{ |
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return 'SELECT NEXT VALUE FOR ' . $sequenceName; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function supportsSequences() |
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{ |
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return true; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* Returns Microsoft SQL Server 2012 specific keywords class |
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*/ |
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1007 |
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protected function getReservedKeywordsClass() |
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{ |
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1007 |
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return Keywords\SQLServer2012Keywords::class; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function doModifyLimitQuery(string $query, ?int $limit, int $offset) : string |
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{ |
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if ($limit === null && $offset <= 0) { |
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return $query; |
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} |
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// Queries using OFFSET... FETCH MUST have an ORDER BY clause |
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// Find the position of the last instance of ORDER BY and ensure it is not within a parenthetical statement |
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// but can be in a newline |
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$matches = []; |
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$matchesCount = preg_match_all("/[\\s]+order\\s+by\\s/im", $query, $matches, PREG_OFFSET_CAPTURE); |
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$orderByPos = false; |
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if ($matchesCount > 0) { |
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$orderByPos = $matches[0][($matchesCount - 1)][1]; |
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} |
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if ($orderByPos === false |
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|| substr_count($query, "(", $orderByPos) - substr_count($query, ")", $orderByPos) |
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) { |
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if (preg_match('/^SELECT\s+DISTINCT/im', $query)) { |
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// SQL Server won't let us order by a non-selected column in a DISTINCT query, |
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// so we have to do this madness. This says, order by the first column in the |
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// result. SQL Server's docs say that a nonordered query's result order is non- |
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// deterministic anyway, so this won't do anything that a bunch of update and |
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// deletes to the table wouldn't do anyway. |
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$query .= " ORDER BY 1"; |
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} else { |
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// In another DBMS, we could do ORDER BY 0, but SQL Server gets angry if you |
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// use constant expressions in the order by list. |
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$query .= " ORDER BY (SELECT 0)"; |
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} |
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} |
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// This looks somewhat like MYSQL, but limit/offset are in inverse positions |
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// Supposedly SQL:2008 core standard. |
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// Per TSQL spec, FETCH NEXT n ROWS ONLY is not valid without OFFSET n ROWS. |
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$query .= sprintf(' OFFSET %d ROWS', $offset); |
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if ($limit !== null) { |
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$query .= sprintf(' FETCH NEXT %d ROWS ONLY', $limit); |
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} |
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return $query; |
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} |
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} |
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doctrine /
dbal
