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Use native Oracle 12c syntax for Top-N queries #5150

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merged 1 commit into from
Dec 30, 2021
Merged

Use native Oracle 12c syntax for Top-N queries #5150

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27 changes: 4 additions & 23 deletions src/Platforms/OraclePlatform.php
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,6 @@
use function count;
use function explode;
use function implode;
use function preg_match;
use function sprintf;
use function str_contains;
use function strlen;
Expand Down Expand Up @@ -859,30 +858,12 @@ public function supportsCommentOnStatement(): bool

protected function doModifyLimitQuery(string $query, ?int $limit, int $offset): string
{
if ($limit === null && $offset <= 0) {
return $query;
if ($offset > 0) {
$query .= sprintf(' OFFSET %d ROWS', $offset);
}

if (preg_match('/^\s*SELECT/i', $query) === 1) {
if (preg_match('/\sFROM\s/i', $query) === 0) {
$query .= ' FROM dual';
}

$columns = ['a.*'];

if ($offset > 0) {
$columns[] = 'ROWNUM AS doctrine_rownum';
}

$query = sprintf('SELECT %s FROM (%s) a', implode(', ', $columns), $query);

if ($limit !== null) {
$query .= sprintf(' WHERE ROWNUM <= %d', $offset + $limit);
}

if ($offset > 0) {
$query = sprintf('SELECT * FROM (%s) WHERE doctrine_rownum >= %d', $query, $offset + 1);
}
if ($limit !== null) {
$query .= sprintf(' FETCH NEXT %d ROWS ONLY', $limit);
}

return $query;
Expand Down
48 changes: 0 additions & 48 deletions tests/Platforms/OraclePlatformTest.php
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Original file line number Diff line number Diff line change
Expand Up @@ -201,54 +201,6 @@ public static function getReturnsForeignKeyReferentialActionSQL(): iterable
];
}

public function testModifyLimitQuery(): void
{
$sql = $this->platform->modifyLimitQuery('SELECT * FROM user', 10, 0);
self::assertEquals('SELECT a.* FROM (SELECT * FROM user) a WHERE ROWNUM <= 10', $sql);
}

public function testModifyLimitQueryWithEmptyOffset(): void
{
$sql = $this->platform->modifyLimitQuery('SELECT * FROM user', 10);
self::assertEquals('SELECT a.* FROM (SELECT * FROM user) a WHERE ROWNUM <= 10', $sql);
}

public function testModifyLimitQueryWithNonEmptyOffset(): void
{
$sql = $this->platform->modifyLimitQuery('SELECT * FROM user', 10, 10);

self::assertEquals(
'SELECT * FROM ('
. 'SELECT a.*, ROWNUM AS doctrine_rownum FROM (SELECT * FROM user) a WHERE ROWNUM <= 20'
. ') WHERE doctrine_rownum >= 11',
$sql
);
}

public function testModifyLimitQueryWithEmptyLimit(): void
{
$sql = $this->platform->modifyLimitQuery('SELECT * FROM user', null, 10);

self::assertEquals(
'SELECT * FROM ('
. 'SELECT a.*, ROWNUM AS doctrine_rownum FROM (SELECT * FROM user) a'
. ') WHERE doctrine_rownum >= 11',
$sql
);
}

public function testModifyLimitQueryWithAscOrderBy(): void
{
$sql = $this->platform->modifyLimitQuery('SELECT * FROM user ORDER BY username ASC', 10);
self::assertEquals('SELECT a.* FROM (SELECT * FROM user ORDER BY username ASC) a WHERE ROWNUM <= 10', $sql);
}

public function testModifyLimitQueryWithDescOrderBy(): void
{
$sql = $this->platform->modifyLimitQuery('SELECT * FROM user ORDER BY username DESC', 10);
self::assertEquals('SELECT a.* FROM (SELECT * FROM user ORDER BY username DESC) a WHERE ROWNUM <= 10', $sql);
}

public function testGenerateTableWithAutoincrement(): void
{
$columnName = strtoupper('id' . uniqid());
Expand Down