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<?php
/**
* Miscellaneous utilities.
*
* @package SqlParser
* @subpackage Utils
*/
namespace SqlParser\Utils;
use SqlParser\Components\Expression;
use SqlParser\Statements\SelectStatement;
/**
* Miscellaneous utilities.
*
* @category Misc
* @package SqlParser
* @subpackage Utils
* @author Dan Ungureanu <udan1107@gmail.com>
* @license http://opensource.org/licenses/GPL-2.0 GNU Public License
*/
class Misc
{
/**
* Gets a list of all aliases and their original names.
*
* @param SelectStatement $statement The statement to be processed.
* @param string $database The name of the database.
*
* @return array
*/
public static function getAliases($statement, $database)
{
if (!($statement instanceof SelectStatement)
|| (empty($statement->expr))
|| (empty($statement->from))
) {
return array();
}
$retval = array();
$tables = array();
/**
* Expressions that may contain aliases.
* These are extracted from `FROM` and `JOIN` keywords.
*
* @var Expression[] $expressions
*/
$expressions = $statement->from;
// Adding expressions from JOIN.
if (!empty($statement->join)) {
foreach ($statement->join as $join) {
$expressions[] = $join->expr;
}
}
foreach ($expressions as $expr) {
if ((!isset($expr->table)) || ($expr->table === '')) {
continue;
}
$thisDb = ((isset($expr->database)) && ($expr->database !== '')) ?
$expr->database : $database;
if (!isset($retval[$thisDb])) {
$retval[$thisDb] = array(
'alias' => null,
'tables' => array(),
);
}
if (!isset($retval[$thisDb]['tables'][$expr->table])) {
$retval[$thisDb]['tables'][$expr->table] = array(
'alias' => ((isset($expr->alias)) && ($expr->alias !== '')) ?
$expr->alias : null,
'columns' => array(),
);
}
if (!isset($tables[$thisDb])) {
$tables[$thisDb] = array();
}
$tables[$thisDb][$expr->alias] = $expr->table;
}
foreach ($statement->expr as $expr) {
if ((!isset($expr->column)) || ($expr->column === '')
|| (!isset($expr->alias)) || ($expr->alias === '')
) {
continue;
}
$thisDb = ((isset($expr->database)) && ($expr->database !== '')) ?
$expr->database : $database;
if ((isset($expr->table)) && ($expr->table !== '')) {
$thisTable = isset($tables[$thisDb][$expr->table]) ?
$tables[$thisDb][$expr->table] : $expr->table;
$retval[$thisDb]['tables'][$thisTable]['columns'][$expr->column] = $expr->alias;
} else {
foreach ($retval[$thisDb]['tables'] as &$table) {
$table['columns'][$expr->column] = $expr->alias;
}
}
}
return $retval;
}
}
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