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- <?php
- namespace Drupal\KernelTests\Core\Database;
- /**
- * Tests the Select query builder.
- *
- * @group Database
- */
- class SelectSubqueryTest extends DatabaseTestBase {
- /**
- * Tests that we can use a subquery in a FROM clause.
- */
- public function testFromSubquerySelect() {
- // Create a subquery, which is just a normal query object.
- $subquery = db_select('test_task', 'tt');
- $subquery->addField('tt', 'pid', 'pid');
- $subquery->addField('tt', 'task', 'task');
- $subquery->condition('priority', 1);
- for ($i = 0; $i < 2; $i++) {
- // Create another query that joins against the virtual table resulting
- // from the subquery.
- $select = db_select($subquery, 'tt2');
- $select->join('test', 't', 't.id=tt2.pid');
- $select->addField('t', 'name');
- if ($i) {
- // Use a different number of conditions here to confuse the subquery
- // placeholder counter, testing https://www.drupal.org/node/1112854.
- $select->condition('name', 'John');
- }
- $select->condition('task', 'code');
- // The resulting query should be equivalent to:
- // SELECT t.name
- // FROM (SELECT tt.pid AS pid, tt.task AS task FROM test_task tt WHERE priority=1) tt
- // INNER JOIN test t ON t.id=tt.pid
- // WHERE tt.task = 'code'
- $people = $select->execute()->fetchCol();
- $this->assertCount(1, $people, 'Returned the correct number of rows.');
- }
- }
- /**
- * Tests that we can use a subquery in a FROM clause with a LIMIT.
- */
- public function testFromSubquerySelectWithLimit() {
- // Create a subquery, which is just a normal query object.
- $subquery = db_select('test_task', 'tt');
- $subquery->addField('tt', 'pid', 'pid');
- $subquery->addField('tt', 'task', 'task');
- $subquery->orderBy('priority', 'DESC');
- $subquery->range(0, 1);
- // Create another query that joins against the virtual table resulting
- // from the subquery.
- $select = db_select($subquery, 'tt2');
- $select->join('test', 't', 't.id=tt2.pid');
- $select->addField('t', 'name');
- // The resulting query should be equivalent to:
- // SELECT t.name
- // FROM (SELECT tt.pid AS pid, tt.task AS task FROM test_task tt ORDER BY priority DESC LIMIT 1 OFFSET 0) tt
- // INNER JOIN test t ON t.id=tt.pid
- $people = $select->execute()->fetchCol();
- $this->assertCount(1, $people, 'Returned the correct number of rows.');
- }
- /**
- * Tests that we can use a subquery with an IN operator in a WHERE clause.
- */
- public function testConditionSubquerySelect() {
- // Create a subquery, which is just a normal query object.
- $subquery = db_select('test_task', 'tt');
- $subquery->addField('tt', 'pid', 'pid');
- $subquery->condition('tt.priority', 1);
- // Create another query that joins against the virtual table resulting
- // from the subquery.
- $select = db_select('test_task', 'tt2');
- $select->addField('tt2', 'task');
- $select->condition('tt2.pid', $subquery, 'IN');
- // The resulting query should be equivalent to:
- // SELECT tt2.name
- // FROM test tt2
- // WHERE tt2.pid IN (SELECT tt.pid AS pid FROM test_task tt WHERE tt.priority=1)
- $people = $select->execute()->fetchCol();
- $this->assertCount(5, $people, 'Returned the correct number of rows.');
- }
- /**
- * Test that we can use a subquery with a relational operator in a WHERE clause.
- */
- public function testConditionSubquerySelect2() {
- // Create a subquery, which is just a normal query object.
- $subquery = db_select('test', 't2');
- $subquery->addExpression('AVG(t2.age)');
- // Create another query that adds a clause using the subquery.
- $select = db_select('test', 't');
- $select->addField('t', 'name');
- $select->condition('t.age', $subquery, '<');
- // The resulting query should be equivalent to:
- // SELECT t.name
- // FROM test t
- // WHERE t.age < (SELECT AVG(t2.age) FROM test t2)
- $people = $select->execute()->fetchCol();
- $this->assertEquals(['John', 'Paul'], $people, 'Returned Paul and John.', 0.0, 10, TRUE);
- }
- /**
- * Test that we can use 2 subqueries with a relational operator in a WHERE clause.
- */
- public function testConditionSubquerySelect3() {
- // Create subquery 1, which is just a normal query object.
- $subquery1 = db_select('test_task', 'tt');
- $subquery1->addExpression('AVG(tt.priority)');
- $subquery1->where('tt.pid = t.id');
- // Create subquery 2, which is just a normal query object.
- $subquery2 = db_select('test_task', 'tt2');
- $subquery2->addExpression('AVG(tt2.priority)');
- // Create another query that adds a clause using the subqueries.
- $select = db_select('test', 't');
- $select->addField('t', 'name');
- $select->condition($subquery1, $subquery2, '>');
- // The resulting query should be equivalent to:
- // SELECT t.name
- // FROM test t
- // WHERE (SELECT AVG(tt.priority) FROM test_task tt WHERE tt.pid = t.id) > (SELECT AVG(tt2.priority) FROM test_task tt2)
- $people = $select->execute()->fetchCol();
- $this->assertEquals(['John'], $people, 'Returned John.', 0.0, 10, TRUE);
- }
- /**
- * Test that we can use multiple subqueries.
- *
- * This test uses a subquery at the left hand side and multiple subqueries at
- * the right hand side. The test query may not be that logical but that's due
- * to the limited amount of data and tables. 'Valid' use cases do exist :)
- */
- public function testConditionSubquerySelect4() {
- // Create subquery 1, which is just a normal query object.
- $subquery1 = db_select('test_task', 'tt');
- $subquery1->addExpression('AVG(tt.priority)');
- $subquery1->where('tt.pid = t.id');
- // Create subquery 2, which is just a normal query object.
- $subquery2 = db_select('test_task', 'tt2');
- $subquery2->addExpression('MIN(tt2.priority)');
- $subquery2->where('tt2.pid <> t.id');
- // Create subquery 3, which is just a normal query object.
- $subquery3 = db_select('test_task', 'tt3');
- $subquery3->addExpression('AVG(tt3.priority)');
- $subquery3->where('tt3.pid <> t.id');
- // Create another query that adds a clause using the subqueries.
- $select = db_select('test', 't');
- $select->addField('t', 'name');
- $select->condition($subquery1, [$subquery2, $subquery3], 'BETWEEN');
- // The resulting query should be equivalent to:
- // SELECT t.name AS name
- // FROM {test} t
- // WHERE (SELECT AVG(tt.priority) AS expression FROM {test_task} tt WHERE (tt.pid = t.id))
- // BETWEEN (SELECT MIN(tt2.priority) AS expression FROM {test_task} tt2 WHERE (tt2.pid <> t.id))
- // AND (SELECT AVG(tt3.priority) AS expression FROM {test_task} tt3 WHERE (tt3.pid <> t.id));
- $people = $select->execute()->fetchCol();
- $this->assertEquals(['George', 'Paul'], $people, 'Returned George and Paul.', 0.0, 10, TRUE);
- }
- /**
- * Tests that we can use a subquery in a JOIN clause.
- */
- public function testJoinSubquerySelect() {
- // Create a subquery, which is just a normal query object.
- $subquery = db_select('test_task', 'tt');
- $subquery->addField('tt', 'pid', 'pid');
- $subquery->condition('priority', 1);
- // Create another query that joins against the virtual table resulting
- // from the subquery.
- $select = db_select('test', 't');
- $select->join($subquery, 'tt', 't.id=tt.pid');
- $select->addField('t', 'name');
- // The resulting query should be equivalent to:
- // SELECT t.name
- // FROM test t
- // INNER JOIN (SELECT tt.pid AS pid FROM test_task tt WHERE priority=1) tt ON t.id=tt.pid
- $people = $select->execute()->fetchCol();
- $this->assertCount(2, $people, 'Returned the correct number of rows.');
- }
- /**
- * Tests EXISTS subquery conditionals on SELECT statements.
- *
- * We essentially select all rows from the {test} table that have matching
- * rows in the {test_people} table based on the shared name column.
- */
- public function testExistsSubquerySelect() {
- // Put George into {test_people}.
- db_insert('test_people')
- ->fields([
- 'name' => 'George',
- 'age' => 27,
- 'job' => 'Singer',
- ])
- ->execute();
- // Base query to {test}.
- $query = db_select('test', 't')
- ->fields('t', ['name']);
- // Subquery to {test_people}.
- $subquery = db_select('test_people', 'tp')
- ->fields('tp', ['name'])
- ->where('tp.name = t.name');
- $query->exists($subquery);
- $result = $query->execute();
- // Ensure that we got the right record.
- $record = $result->fetch();
- $this->assertEquals('George', $record->name, 'Fetched name is correct using EXISTS query.');
- }
- /**
- * Tests NOT EXISTS subquery conditionals on SELECT statements.
- *
- * We essentially select all rows from the {test} table that don't have
- * matching rows in the {test_people} table based on the shared name column.
- */
- public function testNotExistsSubquerySelect() {
- // Put George into {test_people}.
- db_insert('test_people')
- ->fields([
- 'name' => 'George',
- 'age' => 27,
- 'job' => 'Singer',
- ])
- ->execute();
- // Base query to {test}.
- $query = db_select('test', 't')
- ->fields('t', ['name']);
- // Subquery to {test_people}.
- $subquery = db_select('test_people', 'tp')
- ->fields('tp', ['name'])
- ->where('tp.name = t.name');
- $query->notExists($subquery);
- // Ensure that we got the right number of records.
- $people = $query->execute()->fetchCol();
- $this->assertCount(3, $people, 'NOT EXISTS query returned the correct results.');
- }
- }
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