114 lines
3.2 KiB
PHP
114 lines
3.2 KiB
PHP
<?php
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/**
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* Miscellaneous utilities.
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*
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* @package SqlParser
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* @subpackage Utils
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*/
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namespace SqlParser\Utils;
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use SqlParser\Components\Expression;
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use 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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* @package SqlParser
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* @subpackage Utils
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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[] $expressions
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*/
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$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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