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