FetchTest.php

<?php

namespace Drupal\KernelTests\Core\Database;

use Drupal\Core\Database\RowCountException;
use Drupal\Core\Database\StatementInterface;
use Drupal\Tests\system\Functional\Database\FakeRecord;

/**
 * Tests the Database system's various fetch capabilities.
 *
 * We get timeout errors if we try to run too many tests at once.
 *
 * @group Database
 */
class FetchTest extends DatabaseTestBase {
    
    /**
     * Confirms that we can fetch a record properly in default object mode.
     */
    public function testQueryFetchDefault() {
        $records = [];
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
            ':age' => 25,
        ]);
        $this->assertInstanceOf(StatementInterface::class, $result);
        foreach ($result as $record) {
            $records[] = $record;
            $this->assertIsObject($record);
            $this->assertSame('John', $record->name);
        }
        $this->assertCount(1, $records, 'There is only one record.');
    }
    
    /**
     * Confirms that we can fetch a record to an object explicitly.
     */
    public function testQueryFetchObject() {
        $records = [];
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
            ':age' => 25,
        ], [
            'fetch' => \PDO::FETCH_OBJ,
        ]);
        foreach ($result as $record) {
            $records[] = $record;
            $this->assertIsObject($record);
            $this->assertSame('John', $record->name);
        }
        $this->assertCount(1, $records, 'There is only one record.');
    }
    
    /**
     * Confirms that we can fetch a record to an associative array explicitly.
     */
    public function testQueryFetchArray() {
        $records = [];
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
            ':age' => 25,
        ], [
            'fetch' => \PDO::FETCH_ASSOC,
        ]);
        foreach ($result as $record) {
            $records[] = $record;
            $this->assertIsArray($record);
            $this->assertArrayHasKey('name', $record);
            $this->assertSame('John', $record['name']);
        }
        $this->assertCount(1, $records, 'There is only one record.');
    }
    
    /**
     * Confirms that we can fetch a record into a new instance of a custom class.
     *
     * @see \Drupal\system\Tests\Database\FakeRecord
     */
    public function testQueryFetchClass() {
        $records = [];
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
            ':age' => 25,
        ], [
            'fetch' => FakeRecord::class,
        ]);
        foreach ($result as $record) {
            $records[] = $record;
            $this->assertInstanceOf(FakeRecord::class, $record);
            $this->assertSame('John', $record->name);
        }
        $this->assertCount(1, $records, 'There is only one record.');
    }
    
    /**
     * Confirms that we can fetch a record into a class using fetchObject.
     *
     * @see \Drupal\system\Tests\Database\FakeRecord
     * @see \Drupal\Core\Database\StatementPrefetch::fetchObject
     */
    public function testQueryFetchObjectClass() {
        $records = 0;
        $query = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
            ':age' => 25,
        ]);
        while ($result = $query->fetchObject(FakeRecord::class, [
            1,
        ])) {
            $records += 1;
            $this->assertInstanceOf(FakeRecord::class, $result);
            $this->assertSame('John', $result->name, '25 year old is John.');
            $this->assertSame(1, $result->fakeArg, 'The record has received an argument through its constructor.');
        }
        $this->assertSame(1, $records, 'There is only one record.');
    }
    
    /**
     * Confirms that we can fetch a record into a new instance of a custom class.
     *
     * The name of the class is determined from a value of the first column.
     *
     * @see \Drupal\Tests\system\Functional\Database\FakeRecord
     */
    public function testQueryFetchClasstype() {
        $records = [];
        $result = $this->connection
            ->query('SELECT [classname], [name], [job] FROM {test_classtype} WHERE [age] = :age', [
            ':age' => 26,
        ], [
            'fetch' => \PDO::FETCH_CLASS | \PDO::FETCH_CLASSTYPE,
        ]);
        foreach ($result as $record) {
            $records[] = $record;
            $this->assertInstanceOf(FakeRecord::class, $record);
            $this->assertSame('Kay', $record->name);
            $this->assertSame('Web Developer', $record->job);
            $this->assertFalse(isset($record->classname), 'Classname field not found, as intended.');
        }
        $this->assertCount(1, $records, 'There is only one record.');
    }
    
    /**
     * Confirms that we can fetch a record into an indexed array explicitly.
     */
    public function testQueryFetchNum() {
        $records = [];
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
            ':age' => 25,
        ], [
            'fetch' => \PDO::FETCH_NUM,
        ]);
        foreach ($result as $record) {
            $records[] = $record;
            $this->assertIsArray($record);
            $this->assertArrayHasKey(0, $record);
            $this->assertSame('John', $record[0]);
        }
        $this->assertCount(1, $records, 'There is only one record');
    }
    
    /**
     * Confirms that we can fetch a record into a doubly-keyed array explicitly.
     */
    public function testQueryFetchBoth() {
        $records = [];
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
            ':age' => 25,
        ], [
            'fetch' => \PDO::FETCH_BOTH,
        ]);
        foreach ($result as $record) {
            $records[] = $record;
            $this->assertIsArray($record);
            $this->assertArrayHasKey(0, $record);
            $this->assertSame('John', $record[0]);
            $this->assertArrayHasKey('name', $record);
            $this->assertSame('John', $record['name']);
        }
        $this->assertCount(1, $records, 'There is only one record.');
    }
    
    /**
     * Confirms that we can fetch all records into an array explicitly.
     */
    public function testQueryFetchAllColumn() {
        $query = $this->connection
            ->select('test');
        $query->addField('test', 'name');
        $query->orderBy('name');
        $query_result = $query->execute()
            ->fetchAll(\PDO::FETCH_COLUMN);
        $expected_result = [
            'George',
            'John',
            'Paul',
            'Ringo',
        ];
        $this->assertEquals($expected_result, $query_result, 'Returned the correct result.');
    }
    
    /**
     * Confirms that we can fetch an entire column of a result set at once.
     */
    public function testQueryFetchCol() {
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] > :age', [
            ':age' => 25,
        ]);
        $column = $result->fetchCol();
        $this->assertCount(3, $column, 'fetchCol() returns the right number of records.');
        $result = $this->connection
            ->query('SELECT [name] FROM {test} WHERE [age] > :age', [
            ':age' => 25,
        ]);
        $i = 0;
        foreach ($result as $record) {
            $this->assertSame($column[$i++], $record->name, 'Column matches direct access.');
        }
    }
    
    /**
     * Tests that rowCount() throws exception on SELECT query.
     */
    public function testRowCount() {
        $result = $this->connection
            ->query('SELECT [name] FROM {test}');
        try {
            $result->rowCount();
            $exception = FALSE;
        } catch (RowCountException $e) {
            $exception = TRUE;
        }
        $this->assertTrue($exception, 'Exception was thrown');
    }

}