class FetchTest

class FetchTest extends DatabaseTestBase {
  
  /**
   * Confirms that we can fetch a record properly in default object mode.
   */
  public function testQueryFetchDefault() : void {
    $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 single column value.
   */
  public function testQueryFetchColumn() : void {
    $statement = $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 25,
    ]);
    $statement->setFetchMode(FetchAs::Column, 0);
    $this->assertSame('John', $statement->fetch());
  }
  
  /**
   * Confirms that an out of range index throws an error.
   */
  public function testQueryFetchColumnOutOfRange() : void {
    $this->expectException(\ValueError::class);
    $this->expectExceptionMessage('Invalid column index');
    $statement = $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 25,
    ]);
    $statement->setFetchMode(FetchAs::Column, 200);
    $statement->fetch();
  }
  
  /**
   * Confirms that we can fetch a record to an object explicitly.
   */
  public function testQueryFetchObject() : void {
    $records = [];
    $result = $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 25,
    ], [
      'fetch' => FetchAs::Object,
    ]);
    foreach ($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() : void {
    $records = [];
    $result = $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 25,
    ], [
      'fetch' => FetchAs::Associative,
    ]);
    foreach ($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() : void {
    $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\Tests\system\Functional\Database\FakeRecord
   * @see \Drupal\Core\Database\StatementPrefetch::fetchObject
   */
  public function testQueryFetchObjectClass() : void {
    $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 class without constructor args.
   *
   * @see \Drupal\Tests\system\Functional\Database\FakeRecord
   * @see \Drupal\Core\Database\StatementPrefetch::fetchObject
   */
  public function testQueryFetchObjectClassNoConstructorArgs() : void {
    $records = 0;
    $query = $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 25,
    ]);
    while ($result = $query->fetchObject(FakeRecord::class)) {
      $records += 1;
      $this->assertInstanceOf(FakeRecord::class, $result);
      $this->assertSame('John', $result->name);
      $this->assertSame(0, $result->fakeArg);
    }
    $this->assertSame(1, $records);
  }
  
  /**
   * Confirms that we can fetch a record into an indexed array explicitly.
   */
  public function testQueryFetchNum() : void {
    $records = [];
    $result = $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 25,
    ], [
      'fetch' => FetchAs::List,
    ]);
    foreach ($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 all records into an array explicitly.
   */
  public function testQueryFetchAllColumn() : void {
    $query = $this->connection
      ->select('test');
    $query->addField('test', 'name');
    $query->orderBy('name');
    $query_result = $query->execute()
      ->fetchAll(FetchAs::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() : void {
    $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 ::fetchCol() for edge values returned.
   */
  public function testQueryFetchColEdgeCases() : void {
    $this->connection
      ->insert('test_null')
      ->fields([
      'name' => 'Foo',
      'age' => 0,
    ])
      ->execute();
    $this->connection
      ->insert('test_null')
      ->fields([
      'name' => 'Bar',
      'age' => NULL,
    ])
      ->execute();
    $this->connection
      ->insert('test_null')
      ->fields([
      'name' => 'Qux',
      'age' => (int) FALSE,
    ])
      ->execute();
    $statement = $this->connection
      ->select('test_null')
      ->fields('test_null', [
      'age',
    ])
      ->orderBy('id')
      ->execute();
    $this->assertSame([
      '0',
      NULL,
      '0',
    ], $statement->fetchCol());
    // Additional fetch returns FALSE since the result set is finished.
    $this->assertFalse($statement->fetchField());
  }
  
  /**
   * Confirms that an out of range index in fetchCol() throws an error.
   */
  public function testQueryFetchColIndexOutOfRange() : void {
    $this->expectException(\ValueError::class);
    $this->expectExceptionMessage('Invalid column index');
    $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] > :age', [
      ':age' => 25,
    ])
      ->fetchCol(200);
  }
  
  /**
   * Confirms empty result set prevails on out of range index in fetchCol().
   */
  public function testQueryFetchColIndexOutOfRangeOnEmptyResultSet() : void {
    $this->assertSame([], $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 255,
    ])
      ->fetchCol(200));
  }
  
  /**
   * Tests ::fetchAllAssoc().
   */
  public function testQueryFetchAllAssoc() : void {
    $expected_result = [
      "Singer" => [
        "id" => "2",
        "name" => "George",
        "age" => "27",
        "job" => "Singer",
      ],
      "Drummer" => [
        "id" => "3",
        "name" => "Ringo",
        "age" => "28",
        "job" => "Drummer",
      ],
    ];
    $statement = $this->connection
      ->query('SELECT * FROM {test} WHERE [age] > :age', [
      ':age' => 26,
    ]);
    $result = $statement->fetchAllAssoc('job', FetchAs::Associative);
    $this->assertSame($expected_result, $result);
    $statement = $this->connection
      ->query('SELECT * FROM {test} WHERE [age] > :age', [
      ':age' => 26,
    ]);
    $result = $statement->fetchAllAssoc('job', FetchAs::Object);
    $this->assertEquals((object) $expected_result['Singer'], $result['Singer']);
    $this->assertEquals((object) $expected_result['Drummer'], $result['Drummer']);
  }
  
  /**
   * Tests ::fetchField().
   */
  public function testQueryFetchField() : void {
    $this->connection
      ->insert('test')
      ->fields([
      'name' => 'Foo',
      'age' => 0,
      'job' => 'Dummy',
    ])
      ->execute();
    $this->connection
      ->insert('test')
      ->fields([
      'name' => 'Kurt',
      'age' => 27,
      'job' => 'Singer',
    ])
      ->execute();
    $expectedResults = [
      '25',
      '27',
      '28',
      '26',
      '0',
      '27',
    ];
    $statement = $this->connection
      ->select('test')
      ->fields('test', [
      'age',
    ])
      ->orderBy('id')
      ->execute();
    $actualResults = [];
    while (TRUE) {
      $result = $statement->fetchField();
      if ($result === FALSE) {
        break;

      }
      $this->assertIsNumeric($result);
      $actualResults[] = $result;
    }
    $this->assertSame($expectedResults, $actualResults);
  }
  
  /**
   * Tests ::fetchField() for edge values returned.
   */
  public function testQueryFetchFieldEdgeCases() : void {
    $this->connection
      ->insert('test_null')
      ->fields([
      'name' => 'Foo',
      'age' => 0,
    ])
      ->execute();
    $this->connection
      ->insert('test_null')
      ->fields([
      'name' => 'Bar',
      'age' => NULL,
    ])
      ->execute();
    $this->connection
      ->insert('test_null')
      ->fields([
      'name' => 'Qux',
      'age' => (int) FALSE,
    ])
      ->execute();
    $statement = $this->connection
      ->select('test_null')
      ->fields('test_null', [
      'age',
    ])
      ->orderBy('id')
      ->execute();
    // First fetch returns '0' since an existing value is always a string.
    $this->assertSame('0', $statement->fetchField());
    // Second fetch returns NULL since NULL was inserted.
    $this->assertNull($statement->fetchField());
    // Third fetch returns '0' since a FALSE bool cast to int was inserted.
    $this->assertSame('0', $statement->fetchField());
    // Fourth fetch returns FALSE since no row was available.
    $this->assertFalse($statement->fetchField());
  }
  
  /**
   * Confirms that an out of range index in fetchField() throws an error.
   */
  public function testQueryFetchFieldIndexOutOfRange() : void {
    $this->expectException(\ValueError::class);
    $this->expectExceptionMessage('Invalid column index');
    $this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 25,
    ])
      ->fetchField(200);
  }
  
  /**
   * Confirms empty result set prevails on out of range index in fetchField().
   */
  public function testQueryFetchFieldIndexOutOfRangeOnEmptyResultSet() : void {
    $this->assertFalse($this->connection
      ->query('SELECT [name] FROM {test} WHERE [age] = :age', [
      ':age' => 255,
    ])
      ->fetchField(200));
  }
  
  /**
   * Tests that rowCount() throws exception on SELECT query.
   */
  public function testRowCount() : void {
    $result = $this->connection
      ->query('SELECT [name] FROM {test}');
    try {
      $result->rowCount();
      $exception = FALSE;
    } catch (RowCountException) {
      $exception = TRUE;
    }
    $this->assertTrue($exception, 'Exception was thrown');
  }

}