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phpsymfonydoctrinesymfony-2.4

How do access different tables in the database without creating entities in Symfony

I have a table with 3 columns EmployeeNum, JobTitleCode and cost. I have made an entity for it with basic CRUD functions.

EmployeeNum and JobTitleCode are both Foreign Keys and when displaying the entity I want to be able to query another table in the database to extract EmployeeName from EmployeeNum and JobTitle from JobTitleCode.

In Symfony 1.4 I could just do Doctrine_Core::getTable('Employees').find('EmployeeNum') by defining 'Employees' in the schema but I couldn't find any similar method in Symfony 2.4.

From the API for getDoctrine() I didn't find any similar methods I could use and if I build a query as such:

createQuery('SELECT a FROM hs_hr_employee a WHERE a.emp_number=1')

I get the error below

[Semantical Error] line 0, col 14 near 'hs_hr_employee': Error: Class 'hs_hr_employee' is not defined

So how do you go about accessing data from other tables in the db?

Solution

  • Doctrine always tries to map your results to entities by default.

    You can use a prepared statement without the need to provide a result-mapping:

    get the connection:

    $connection = $em->getConnection();

    preparing a statement and executing it:

    $statement = $connection->prepare(
    'SELECT a FROM hs_hr_employee a WHERE a.emp_number = :emp'
);
$statement->bindValue('emp', $emp);
$statement->execute();

// for SELECT queries 
$result = $statement->fetchAll('EAGER');  // note: !== $connection->fetchAll()!

// for INSERT, UPDATE, DELETE queries
$affected_rows = $statement->rowCount();

    This is pretty expressive. See the examples below for shorter variants.

    Alternative:

    Use a Native SQL query with a result-mapping.

    Advanced example shows how to rename columns in the result-array.

    // create a result-mapping
$rsm = new ResultSetMapping;
$rsm->addScalarResult('n', 'nickname');
$rsm->addScalarResult('f', 'muchachos');

$query = $em->createNativeQuery(
    '
     SELECT 
        users.name as n
        COUNT(user.friends) as f
     WHERE
        users.name = :username_parameter
     FROM
        user_table_name users
    ',
    $rsm
);
$query->setParameter('username_parameter', $username); 

$result = $query->getSingleResult(\Doctrine\ORM\AbstractQuery::HYDRATE_ARRAY);

// example: $username = 'nifr'
// array => [ 
//   'nickname'  => 'nifr'
//   'muchachos' => 3919410
// ]

    Shorter versions: (letting doctrine prepare the statement + directly fetch result)

    // for SELECT queries
$result = $connection->executeQuery(
    'SELECT a FROM hs_hr_employee a WHERE a.emp_number = ?'
    array($emp)
);

//for INSERT, UPDATE, DELETE queries
$affected_rows = $connection->executeUpdate(
    'DELETE FROM hs_hr_employee a WHERE a.emp_number = ?',
    array($emp)
);

// fetch all into array ( <numeric-index> => <associative-array-entry> )
$connection->fetchAll(
    'SELECT a FROM hs_hr_employee a WHERE a.emp_number = ?',
    array($emp)
);
// fetch only first-row of result-set as associative array
$connection->fetchAssoc(
   'SELECT a FROM hs_hr_employee a WHERE a.emp_number = ?',
    array($emp)
);
// fetch only first-row of result-set as array with numeric indexes
$connection->fetchArray(
    'SELECT a FROM hs_hr_employee a WHERE a.emp_number = ?',
    array($emp)
);

    Even shorter variants (for of INSERT, UPDATE or DELETE queries)

    // DELETE FROM user WHERE id = ? (1)
$conn->delete('user', array('id' => 1));

// INSERT INTO user (username) VALUES (?) (nifr)
$conn->insert('user', array('username' => 'nifr'));

// UPDATE user (username) VALUES (?) WHERE id = ? (nifr, 1)
$conn->update('user', array('username' => 'nifr'), array('id' => 1));

    Useful links: