120 Zeilen
3,9 KiB
PHP
120 Zeilen
3,9 KiB
PHP
<?php
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class Msd_Sql_Parser
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{
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private $_rawQuery = null;
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protected $_sqlStatements = array(
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2 => array(
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'do', 'xa'
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),
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3 => array(
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'set', 'use'
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),
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4 => array(
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'call', 'drop', 'help', 'kill', 'load', 'lock', 'show'
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),
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5 => array(
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'alter', 'check', 'flush', 'grant', 'purge', 'reset', 'slave', 'start'
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),
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6 => array(
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'backup', 'change', 'commit', 'create', 'delete', 'insert', 'rename', 'repair', 'revoke', 'select',
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'unlock', 'update'
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),
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7 => array(
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'analyze', 'execute', 'handler', 'install', 'preload', 'prepare', 'release', 'replace', 'restore'
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),
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8 => array(
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'checksum', 'describe', 'optimize', 'keycache', 'rollback', 'truncate'
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),
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9 => array(
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'savepoint', 'uninstall'
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),
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10 => array(
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'deallocate'
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),
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);
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protected $_sqlComments = array(
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'--' => "\n", '/*' => '*/'
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);
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public function __construct($sqlQuery = null)
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{
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if ($sqlQuery !== null) {
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$this->_rawQuery = $sqlQuery;
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}
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}
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public function parse($sqlQuery = null)
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{
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if ($sqlQuery === null) {
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if ($this->_rawQuery === null) {
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include_once 'Msd/Sql/Parser/Exception.php';
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throw new Msd_Sql_Parser_Exception('You must specify a MySQL query for parsing!');
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}
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$sqlQuery = $this->_rawQuery;
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}
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$sqlQuery = trim($sqlQuery);
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$statementCounter = 0;
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$startPos = 0;
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while ($startPos < strlen($sqlQuery)) {
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$statementCounter++;
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$firstSpace = strpos($sqlQuery, ' ', $startPos);
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$statement = trim(strtolower(substr($sqlQuery, $startPos, $firstSpace - $startPos)));
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$lengthCheck = strlen($statement);
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if ($lengthCheck == 0) {
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break;
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}
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if ($lengthCheck == 1 || $statement{1} == ';' || $statement{1} == "\n") {
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$startPos = $startPos + 1;
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continue;
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}
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$commentCheck = substr($statement, 0, 2);
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if (array_key_exists($commentCheck, $this->_sqlComments)) {
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$commentEnd = $this->_sqlComments[$commentCheck];
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$startPos = strpos($sqlQuery, $commentEnd, $startPos) + strlen($commentEnd);
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continue;
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}
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$statementLength = strlen($statement);
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if (!isset($this->_sqlStatements[$statementLength])) {
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die("$statement\n");
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}
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if (!in_array($statement, $this->_sqlStatements[$statementLength])) {
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include_once 'Msd/Sql/Parser/Exception.php';
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throw new Msd_Sql_Parser_Exception("Unknown MySQL statement is found: '$statement'");
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}
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$parserClass = 'Msd_Sql_Parser_' . ucwords($statement);
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$endPos = $this->_getStatementEndPos($sqlQuery, $startPos);
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$completeStatement = trim(substr($sqlQuery, $startPos, $endPos - $startPos));
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$startPos = $endPos + 1;
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}
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}
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private function _getStatementEndPos($sqlQuery, $startPos = 0)
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{
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$nextString = strpos($sqlQuery, "'", $startPos);
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$nextSemicolon = strpos($sqlQuery, ';', $startPos);
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if ($nextString === false) {
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if ($nextSemicolon === false) {
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return strlen($sqlQuery);
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}
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return $nextSemicolon;
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}
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while ($nextString < $nextSemicolon) {
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$nextString = strpos($sqlQuery, "'", $nextString + 1);
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$nextSemicolon = strpos($sqlQuery, ';', $nextString + 1);
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$nextString = strpos($sqlQuery, "'", $nextString + 1);
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if ($nextString === false) {
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break;
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}
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}
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return $nextSemicolon;
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}
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}
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