397 lines
12 KiB
PHP
397 lines
12 KiB
PHP
<?php
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/**
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* This file defines CreateQuery class.
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*
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* @package SQLite Integration
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* @author Kojima Toshiyasu
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*/
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/**
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* This class provides a function to rewrite CREATE query.
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*
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*/
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class CreateQuery{
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/**
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* The query string to be rewritten in this class.
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*
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* @var string
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* @access private
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*/
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private $_query = '';
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/**
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* The array to contain CREATE INDEX queries.
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*
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* @var array of strings
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* @access private
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*/
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private $index_queries = array();
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/**
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* The array to contain error messages.
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*
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* @var array of string
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* @access private
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*/
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private $_errors = array();
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/**
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* Variable to have the table name to be executed.
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*
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* @var string
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* @access private
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*/
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private $table_name = '';
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/**
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* Variable to check if the query has the primary key.
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*
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* @var boolean
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* @access private
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*/
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private $has_primary_key = false;
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/**
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* Function to rewrite query.
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*
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* @param string $query the query being processed
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* @return string|array the processed (rewritten) query
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*/
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public function rewrite_query($query){
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$this->_query = $query;
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$this->_errors [] = '';
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if (preg_match('/^CREATE\\s*(UNIQUE|FULLTEXT|)\\s*INDEX/ims', $this->_query, $match)) {
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// we manipulate CREATE INDEX query in PDOEngine.class.php
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// FULLTEXT index creation is simply ignored.
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if (isset($match[1]) && stripos($match[1], 'fulltext') !== false) {
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return 'SELECT 1=1';
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} else {
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return $this->_query;
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}
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} elseif (preg_match('/^CREATE\\s*(TEMP|TEMPORARY|)\\s*TRIGGER\\s*/im', $this->_query)) {
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// if WordPress comes to use foreign key constraint, trigger will be needed.
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// we don't use it for now.
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return $this->_query;
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}
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$this->strip_backticks();
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$this->get_table_name();
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$this->rewrite_comments();
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$this->rewrite_field_types();
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$this->rewrite_character_set();
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$this->rewrite_engine_info();
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$this->rewrite_unsigned();
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$this->rewrite_autoincrement();
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$this->rewrite_primary_key();
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$this->rewrite_foreign_key();
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$this->rewrite_unique_key();
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$this->rewrite_enum();
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$this->rewrite_set();
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$this->rewrite_key();
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$this->add_if_not_exists();
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return $this->post_process();
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}
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/**
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* Method to get table name from the query string.
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*
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* 'IF NOT EXISTS' clause is removed for the easy regular expression usage.
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* It will be added at the end of the process.
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*
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* @access private
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*/
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private function get_table_name(){
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// $pattern = '/^\\s*CREATE\\s*(TEMP|TEMPORARY)?\\s*TABLE\\s*(IF NOT EXISTS)?\\s*([^\(]*)/imsx';
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$pattern = '/^\\s*CREATE\\s*(?:TEMP|TEMPORARY)?\\s*TABLE\\s*(?:IF\\s*NOT\\s*EXISTS)?\\s*([^\(]*)/imsx';
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if (preg_match($pattern, $this->_query, $matches)) {
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$this->table_name = trim($matches[1]);
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}
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}
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/**
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* Method to change the MySQL field types to SQLite compatible types.
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*
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* Order of the key value is important. Don't change it.
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*
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* @access private
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*/
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private function rewrite_field_types(){
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$array_types = array (
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'bit' => 'integer', 'bool' => 'integer',
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'boolean' => 'integer', 'tinyint' => 'integer',
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'smallint' => 'integer', 'mediumint' => 'integer',
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'int' => 'integer', 'integer' => 'integer',
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'bigint' => 'integer', 'float' => 'real',
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'double' => 'real', 'decimal' => 'real',
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'dec' => 'real', 'numeric' => 'real',
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'fixed' => 'real', 'date' => 'text',
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'datetime' => 'text', 'timestamp' => 'text',
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'time' => 'text', 'year' => 'text',
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'char' => 'text', 'varchar' => 'text',
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'binary' => 'integer', 'varbinary' => 'blob',
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'tinyblob' => 'blob', 'tinytext' => 'text',
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'blob' => 'blob', 'text' => 'text',
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'mediumblob' => 'blob', 'mediumtext' => 'text',
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'longblob' => 'blob', 'longtext' => 'text'
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);
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foreach ($array_types as $o=>$r){
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$pattern = "/\\b(?<!`)$o\\b\\s*(\([^\)]*\)*)?\\s*/ims";
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if (preg_match("/^\\s*.*?\\s*\(.*?$o.*?\)/im", $this->_query)) {
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;
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} else {
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$this->_query = preg_replace($pattern, " $r ", $this->_query);
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}
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}
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}
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/**
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* Method for stripping the comments from the SQL statement.
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*
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* @access private
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*/
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private function rewrite_comments(){
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$this->_query = preg_replace("/# --------------------------------------------------------/","-- ******************************************************",$this->_query);
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$this->_query = preg_replace("/#/","--",$this->_query);
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}
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/**
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* Method for stripping the engine and other stuffs.
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*
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* TYPE, ENGINE and AUTO_INCREMENT are removed here.
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* @access private
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*/
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private function rewrite_engine_info(){
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$this->_query = preg_replace("/\\s*(TYPE|ENGINE)\\s*=\\s*.*(?<!;)/ims",'',$this->_query);
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$this->_query = preg_replace("/ AUTO_INCREMENT\\s*=\\s*[0-9]*/ims",'',$this->_query);
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}
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/**
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* Method for stripping unsigned.
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*
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* SQLite doesn't have unsigned int data type. So UNSIGNED INT(EGER) is converted
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* to INTEGER here.
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*
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* @access private
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*/
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private function rewrite_unsigned(){
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$this->_query = preg_replace('/\\bunsigned\\b/ims', ' ', $this->_query);
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}
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/**
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* Method for rewriting primary key auto_increment.
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*
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* If the field type is 'INTEGER PRIMARY KEY', it is automatically autoincremented
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* by SQLite. There's a little difference between PRIMARY KEY and AUTOINCREMENT, so
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* we may well convert to PRIMARY KEY only.
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*
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* @access private
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*/
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private function rewrite_autoincrement(){
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$this->_query = preg_replace('/\\bauto_increment\\s*primary\\s*key\\s*(,)?/ims', ' PRIMARY KEY AUTOINCREMENT \\1', $this->_query, -1, $count);
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$this->_query = preg_replace('/\\bauto_increment\\b\\s*(,)?/ims', ' PRIMARY KEY AUTOINCREMENT $1', $this->_query, -1, $count);
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if ($count > 0){
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$this->has_primary_key = true;
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}
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}
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/**
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* Method for rewriting primary key.
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*
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* @access private
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*/
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private function rewrite_primary_key(){
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if ($this->has_primary_key) {
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$this->_query = preg_replace('/\\s*primary key\\s*.*?\([^\)]*\)\\s*(,|)/i', ' ', $this->_query);
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} else {
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// If primary key has an index name, we remove that name.
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$this->_query = preg_replace('/\\bprimary\\s*key\\s*.*?\\s*(\(.*?\))/im', 'PRIMARY KEY \\1', $this->_query);
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}
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}
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/**
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* Method for rewriting foreign key.
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*
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* @access private
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*/
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private function rewrite_foreign_key() {
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$pattern = '/\\s*foreign\\s*key\\s*(|.*?)\([^\)]+?\)\\s*references\\s*.*/i';
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if (preg_match_all($pattern, $this->_query, $match)) {
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if (isset($match[1])) {
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$this->_query = str_ireplace($match[1], '', $this->_query);
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}
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}
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}
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/**
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* Method for rewriting unique key.
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*
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* @access private
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*/
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private function rewrite_unique_key(){
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$this->_query = preg_replace_callback('/\\bunique key\\b([^\(]*)(\(.*\))/im', array($this, '_rewrite_unique_key'), $this->_query);
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}
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/**
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* Callback method for rewrite_unique_key.
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*
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* @param array $matches an array of matches from the Regex
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* @access private
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*/
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private function _rewrite_unique_key($matches){
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$index_name = trim($matches[1]);
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$col_name = trim($matches[2]);
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$tbl_name = $this->table_name;
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if (preg_match('/\(\\d+?\)/', $col_name)) {
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$col_name = preg_replace('/\(\\d+?\)/', '', $col_name);
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}
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$_wpdb = new PDODB();
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$results = $_wpdb->get_results("SELECT name FROM sqlite_master WHERE type='index'");
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$_wpdb = null;
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if ($results) {
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foreach ($results as $result) {
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if ($result->name == $index_name) {
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$r = rand(0, 50);
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$index_name = $index_name . "_$r";
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break;
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}
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}
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}
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$index_name = str_replace(' ', '', $index_name);
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$this->index_queries[] = "CREATE UNIQUE INDEX $index_name ON " . $tbl_name .$col_name;
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return '';
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}
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/**
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* Method for handling ENUM fields.
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*
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* SQLite doesn't support enum, so we change it to check constraint.
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*
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* @access private
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*/
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private function rewrite_enum(){
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$pattern = '/(,|\))([^,]*)enum\((.*?)\)([^,\)]*)/ims';
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$this->_query = preg_replace_callback($pattern, array($this, '_rewrite_enum'), $this->_query);
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}
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/**
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* Call back method for rewrite_enum() and rewrite_set().
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*
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* @access private
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*/
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private function _rewrite_enum($matches){
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$output = $matches[1] . ' ' . $matches[2]. ' TEXT '. $matches[4].' CHECK ('.$matches[2].' IN ('.$matches[3].')) ';
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return $output;
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}
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/**
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* Method for rewriting usage of set.
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*
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* It is similar but not identical to enum. SQLite does not support either.
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*
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* @access private
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*/
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private function rewrite_set(){
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$pattern = '/\b(\w)*\bset\\s*\((.*?)\)\\s*(.*?)(,)*/ims';
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$this->_query = preg_replace_callback($pattern, array($this, '_rewrite_enum'), $this->_query);
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}
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/**
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* Method for rewriting usage of key to create an index.
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*
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* SQLite cannot create non-unique indices as part of the create query,
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* so we need to create an index by hand and append it to the create query.
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*
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* @access private
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*/
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private function rewrite_key(){
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$this->_query = preg_replace_callback('/,\\s*(KEY|INDEX)\\s*(\\w+)?\\s*(\(.*(?<!\\d)\))/im', array($this, '_rewrite_key'), $this->_query);
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}
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/**
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* Callback method for rewrite_key.
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*
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* @param array $matches an array of matches from the Regex
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* @access private
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*/
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private function _rewrite_key($matches){
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$index_name = trim($matches[2]);
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$col_name = trim($matches[3]);
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if (preg_match('/\([0-9]+?\)/', $col_name, $match)) {
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$col_name = preg_replace_callback('/\([0-9]+?\)/', array($this, '_remove_length'), $col_name);
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}
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$tbl_name = $this->table_name;
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$_wpdb = new PDODB();
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$results = $_wpdb->get_results("SELECT name FROM sqlite_master WHERE type='index'");
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$_wpdb = null;
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if ($results) {
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foreach ($results as $result) {
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if ($result->name == $index_name) {
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$r = rand(0, 50);
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$index_name = $index_name . "_$r";
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break;
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}
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}
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}
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$this->index_queries[] = 'CREATE INDEX '. $index_name . ' ON ' . $tbl_name . $col_name ;
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return '';
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}
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/**
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* Call back method to remove unnecessary string.
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*
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* This method is deprecated.
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*
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* @param string $match
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* @return string whose length is zero
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* @access private
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*/
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private function _remove_length($match) {
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return '';
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}
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/**
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* Method to assemble the main query and index queries into an array.
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*
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* It return the array of the queries to be executed separately.
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*
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* @return array
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* @access private
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*/
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private function post_process() {
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$mainquery = $this->_query;
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do{
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$count = 0;
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$mainquery = preg_replace('/,\\s*\)/imsx',')', $mainquery, -1, $count);
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} while ($count > 0);
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do {
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$count = 0;
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$mainquery = preg_replace('/\(\\s*?,/imsx', '(', $mainquery, -1, $count);
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} while ($count > 0);
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$return_val[] = $mainquery;
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$return_val = array_merge($return_val, $this->index_queries);
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return $return_val;
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}
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/**
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* Method to add IF NOT EXISTS to query string.
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*
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* This adds IF NOT EXISTS to every query string, which prevent the exception
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* from being thrown.
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*
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* @access private
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*/
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private function add_if_not_exists(){
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$pattern_table = '/^\\s*CREATE\\s*(TEMP|TEMPORARY)?\\s*TABLE\\s*(IF NOT EXISTS)?\\s*/ims';
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$this->_query = preg_replace($pattern_table, 'CREATE $1 TABLE IF NOT EXISTS ', $this->_query);
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$pattern_index = '/^\\s*CREATE\\s*(UNIQUE)?\\s*INDEX\\s*(IF NOT EXISTS)?\\s*/ims';
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for ($i = 0; $i < count($this->index_queries); $i++) {
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$this->index_queries[$i] = preg_replace($pattern_index, 'CREATE $1 INDEX IF NOT EXISTS ', $this->index_queries[$i]);
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}
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}
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/**
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* Method to strip back quotes.
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*
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* @access private
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*/
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private function strip_backticks(){
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$this->_query = str_replace('`', '', $this->_query);
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foreach ($this->index_queries as &$query) {
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$query = str_replace('`', '', $query);
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}
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}
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/**
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* Method to remove the character set information from within mysql queries.
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*
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* This removes DEFAULT CHAR(ACTER) SET and COLLATE, which is meaningless for
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* SQLite.
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*
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* @access private
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*/
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private function rewrite_character_set(){
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$pattern_charset = '/\\b(default\\s*character\\s*set|default\\s*charset|character\\s*set)\\s*(?<!\()[^ ]*/im';
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$pattern_collate1 = '/\\s*collate\\s*[^ ]*(?=,)/im';
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$pattern_collate2 = '/\\s*collate\\s*[^ ]*(?<!;)/im';
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$patterns = array($pattern_charset, $pattern_collate1, $pattern_collate2);
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$this->_query = preg_replace($patterns, '', $this->_query);
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}
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}
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?>
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