php-如何在不创建Symfony中实体的情况下访问数据库中的不同表

我有一个包含3列EmployeeNum,JobTitleCode和cost的表.我已经使用基本的CRUD功能为其创建了一个实体.

EmployeeNum和JobTitleCode都是外键,当显示实体时,我希望能够查询数据库中的另一个表以从EmployeeNum中提取EmployeeName和从JobTitleCode中提取JobTitle.

在Symfony 1.4中,我可以通过在模式中定义“ Employees”来执行Doctrine_Core :: getTable(‘Employees’).find(‘EmployeeNum’),但在Symfony 2.4中找不到任何类似的方法.

从API的getDoctrine()开始,我没有找到任何可以使用的类似方法,并且如果我像这样构建查询：

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

我收到以下错误

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

那么,如何从数据库中的其他表访问数据呢？

解决方法:

在默认情况下,Doctrine始终尝试将结果映射到实体.

您可以使用prepared statement,而无需提供结果映射：

获得连接：

$connection = $em->getConnection();

准备一条语句并执行它：

$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();

这很有表现力.请参阅以下示例以了解更短的变体.

选择：

使用带有结果映射的Native SQL query.

高级示例显示了如何重命名结果数组中的列.

// 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
// ]

较短的版本：(让原则准备语句直接获取结果)

// 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)
);

甚至更短的变体(用于INSERT,UPDATE或DELETE查询)

// 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));

有用的链接：

> Using prepared statement
> Native SQL
>声明(界面)API doc
>声明(界面)Code

标签：symfony,doctrine,symfony-2-4,php
来源： https://codeday.me/bug/20191122/2056711.html