542 lines
19 KiB
PHP
542 lines
19 KiB
PHP
<?php
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/**
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* @package SQLite Integration
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* @author Kojima Toshiyasu, Justin Adie
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*/
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/**
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* base class for sql rewriting except CREATE, ALTER TABLE
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*/
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class PDOSQLiteDriver {
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//required variables
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public $query_type = '';
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public $_query = '';
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/**
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* function to determin which functions to use
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* @param strin $query
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* @param string $query_type
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* @return string
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*/
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public function rewrite_query($query, $query_type){
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$this->query_type = $query_type;
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$this->_query = $query;
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switch ($this->query_type) {
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case 'truncate':
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$this->_handle_truncate_query();
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break;
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case 'alter':
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$this->_handle_alter_query();
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break;
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case 'create':
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$this->_handle_create_query();
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break;
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case 'describe':
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case 'desc':
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$this->_handle_describe_query();
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break;
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case 'show':
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$this->_handle_show_query();
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break;
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case 'showcolumns':
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$this->_handle_show_columns_query();
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break;
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case 'showindex':
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$this->_handle_show_index();
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break;
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case 'select':
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$this->_strip_backticks();
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$this->_handle_sql_count();
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$this->_rewrite_date_sub();
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$this->_delete_index_hints();
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$this->_rewrite_regexp();
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$this->_rewrite_boolean();
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$this->_fix_date_quoting();
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$this->_rewrite_between();
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break;
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case 'insert':
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$this->_strip_backticks();
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$this->_execute_duplicate_key_update();
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$this->_rewrite_insert_ignore();
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$this->_rewrite_regexp();
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$this->_fix_date_quoting();
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break;
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case 'update':
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$this->_strip_backticks();
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$this->_rewrite_update_ignore();
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// $this->_rewrite_date_sub();
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$this->_rewrite_limit_usage();
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$this->_rewrite_order_by_usage();
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$this->_rewrite_regexp();
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$this->_rewrite_between();
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break;
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case 'delete':
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$this->_strip_backticks();
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$this->_rewrite_limit_usage();
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$this->_rewrite_order_by_usage();
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$this->_rewrite_date_sub();
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$this->_rewrite_regexp();
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$this->_delete_workaround();
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break;
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case 'replace':
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$this->_strip_backticks();
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$this->_rewrite_date_sub();
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$this->_rewrite_regexp();
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break;
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case 'optimize':
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$this->_rewrite_optimize();
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break;
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default:
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}
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return $this->_query;
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}
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/**
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* method to dummy the SHOW TABLES query
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*/
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private function _handle_show_query(){
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$table_name = '';
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$pattern = '/^\\s*SHOW\\s*TABLES\\s*.*?(LIKE\\s*(.*))$/im';
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if (preg_match($pattern, $this->_query, $matches)) {
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$table_name = str_replace(array("'", ';'), '', $matches[2]);
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}
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if (!empty($table_name)) {
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$suffix = ' AND name LIKE '. "'" . $table_name . "'";
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} else {
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$suffix = '';
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}
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$this->_query = "SELECT name FROM sqlite_master WHERE type='table'" . $suffix . ' ORDER BY name DESC';
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}
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/**
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* method to strip all column qualifiers (backticks) from a query
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*/
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private function _strip_backticks(){
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$this->_query = str_replace('`', '', $this->_query);
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}
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/**
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* method to emulate the SQL_CALC_FOUND_ROWS placeholder for mysql
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*
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* this is a kind of tricky play.
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* 1. remove SQL_CALC_FOUND_ROWS option, and give it to the pdo engine
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* 2. make another $wpdb instance, and execute SELECT COUNT(*) query
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* 3. give the returned value to the original instance variable
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*
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* when SQL statement contains GROUP BY option, SELECT COUNT query doesn't
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* go well. So we remove the GROUP BY, which means the returned value may
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* be a approximate one.
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*
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* this kind of statement is required for WordPress to calculate the paging.
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* see also WP_Query class in wp-includes/query.php
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*/
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private function _handle_sql_count(){
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if (stripos($this->_query, 'SELECT SQL_CALC_FOUND_ROWS') !== false){
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global $wpdb;
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// first strip the code. this is the end of rewriting process
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$this->_query = str_ireplace('SQL_CALC_FOUND_ROWS', '', $this->_query);
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// we make the data for next SELECE FOUND_ROWS() statement
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$unlimited_query = preg_replace('/\\bLIMIT\\s*.*/imsx', '', $this->_query);
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// $unlimited_query = preg_replace('/\\bFALSE\\s*.*/imsx', '0', $unlimited_query);
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$unlimited_query = preg_replace('/\\bGROUP\\s*BY\\s*.*/imsx', '', $unlimited_query);
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$unlimited_query = $this->__transform_to_count($unlimited_query);
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$_wpdb = new PDODB();
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$result = $_wpdb->query($unlimited_query);
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$wpdb->dbh->found_rows_result = $_wpdb->last_result;
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}
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}
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/**
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* transforms a select query to a select count(*)
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*
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* @param string $query the query to be transformed
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* @return string the transformed query
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*/
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private function __transform_to_count($query){
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$pattern = '/^\\s*SELECT\\s*(DISTINCT|)?.*?FROM\b/imsx';
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$_query = preg_replace($pattern, 'SELECT \\1 COUNT(*) FROM ', $query);
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return $_query;
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}
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/**
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* rewrites the insert ignore phrase for sqlite
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*/
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private function _rewrite_insert_ignore(){
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$this->_query = str_ireplace('INSERT IGNORE', 'INSERT OR IGNORE ', $this->_query);
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}
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/**
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* rewrites the update ignore phrase for sqlite
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*/
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private function _rewrite_update_ignore(){
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$this->_query = str_ireplace('UPDATE IGNORE', 'UPDATE OR IGNORE ', $this->_query);
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}
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/**
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* rewrites the date_add function for udf to manipulate
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*/
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private function _rewrite_date_add(){
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//(date,interval expression unit)
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$pattern = '/\\s*date_add\\s*\(([^,]*),([^\)]*)\)/imsx';
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if (preg_match($pattern, $this->_query, $matches)) {
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$expression = "'".trim($matches[2])."'";
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$this->_query = preg_replace($pattern, " date_add($matches[1], $expression) ", $this->_query);
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}
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}
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/**
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* rewrite the data_sub function for udf to manipulate
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*/
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private function _rewrite_date_sub(){
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//(date,interval expression unit)
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$pattern = '/\\s*date_sub\\s*\(([^,]*),([^\)]*)\)/imsx';
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if (preg_match($pattern, $this->_query, $matches)) {
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$expression = "'".trim($matches[2])."'";
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$this->_query = preg_replace($pattern, " date_sub($matches[1], $expression) ", $this->_query);
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}
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}
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/**
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* handles the create query
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* this function won't be used... See PDOEngine class
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*/
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private function _handle_create_query(){
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require_once PDODIR.'query_create.class.php';
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$engine = new CreateQuery();
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$this->_query = $engine->rewrite_query($this->_query);
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$engine = null;
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}
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/**
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* handles the ALTER query
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* this function won't be used... See PDOEngine class
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*/
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private function _handle_alter_query(){
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require_once PDODIR . 'query_alter.class.php';
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$engine = new AlterQuery();
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$this->_query = $engine->rewrite_query($this->_query, 'alter');
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$engine = null;
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}
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/**
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* handles DESCRIBE or DESC query
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* this is required in the WordPress install process
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*/
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private function _handle_describe_query(){
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// $this->_query = "select 1=1";
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$pattern = '/^\\s*(DESCRIBE|DESC)\\s*(.*)/i';
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if (preg_match($pattern, $this->_query, $match)) {
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$tablename = preg_replace('/[\';]/', '', $match[2]);
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$this->_query = "PRAGMA table_info($tablename)";
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}
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}
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/**
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* The author of the original 'PDO for WordPress' says update method of wpdb
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* insists on adding LIMIT. But the newest version of WordPress doesn't do that.
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* Nevertheless some plugins use DELETE with LIMIT, UPDATE with LIMIT.
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* We need to exclude sub query's LIMIT.
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*/
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private function _rewrite_limit_usage(){
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if (stripos($this->_query, '(select') === false) {
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$this->_query = preg_replace('/\\s*LIMIT\\s*[0-9]$/i', '', $this->_query);
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}
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}
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/**
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* SQLite compiled without SQLITE_ENABLE_UPDATE_DELETE_LIMIT option can't
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* execute UPDATE with ORDER BY, DELETE with GROUP BY.
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* We need to exclude sub query's GROUP BY.
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*/
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private function _rewrite_order_by_usage() {
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if (stripos($this->_query, '(select') === false) {
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$this->_query = preg_replace('/\\s*ORDER\\s*BY\\s*.*$/i', '', $this->_query);
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}
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}
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private function _handle_truncate_query(){
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$pattern = '/TRUNCATE TABLE (.*)/im';
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$this->_query = preg_replace($pattern, 'DELETE FROM $1', $this->_query);
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}
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/**
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* rewrites use of Optimize queries in mysql for sqlite.
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* table name is ignored.
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*/
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private function _rewrite_optimize(){
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$this->_query ="VACUUM";
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}
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/**
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* Jusitn Adie says: some wp UI interfaces (notably the post interface)
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* badly composes the day part of the date leading to problems in sqlite
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* sort ordering etc.
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*
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* I don't understand that...
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*
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* @return void
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*/
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private function _rewrite_badly_formed_dates(){
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$pattern = '/([12]\d{3,}-\d{2}-)(\d )/ims';
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$this->_query = preg_replace($pattern, '${1}0$2', $this->_query);
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}
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/**
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* function to remove unsupported index hinting from mysql queries
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*
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* @return void
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*/
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private function _delete_index_hints(){
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$pattern = '/\\s*(use|ignore|force)\\s+index\\s*\(.*?\)/i';
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$this->_query = preg_replace($pattern, '', $this->_query);
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}
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/**
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* Fix the date string and quote. This is required for the calendar widget.
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*
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* where month(fieldname)=08 becomes month(fieldname)='8'
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* where month(fieldname)='08' becomes month(fieldname)='8'
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*
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* I use preg_replace_callback instead of 'e' option because of security reason.
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* cf. PHP manual (regular expression)
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*
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* @return void
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*/
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private function _fix_date_quoting() {
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$pattern = '/(month|year|second|day|minute|hour|dayofmonth)\\s*\((.*?)\)\\s*=\\s*["\']?(\d{1,4})[\'"]?\\s*/im';
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$this->_query = preg_replace_callback($pattern, array($this, '__fix_date_quoting'), $this->_query);
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}
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private function __fix_date_quoting($match) {
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$fixed_val = "{$match[1]}({$match[2]})='" . intval($match[3]) . "' ";
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return $fixed_val;
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}
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private function _rewrite_regexp(){
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$pattern = '/\s([^\s]*)\s*regexp\s*(\'.*?\')/im';
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$this->_query = preg_replace($pattern, ' regexpp(\1, \2)', $this->_query);
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}
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/**
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* rewrites boolean to numeral
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* SQLite doesn't support true/false type
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*/
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private function _rewrite_boolean() {
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$query = str_ireplace('TRUE', "1", $this->_query);
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$query = str_ireplace('FALSE', "0", $query);
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$this->_query = $query;
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}
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/**
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* method to execute SHOW COLUMNS query
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*/
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private function _handle_show_columns_query() {
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$pattern_like = '/^\\s*SHOW\\s*(COLUMNS|FIELDS)\\s*FROM\\s*(.*)?\\s*LIKE\\s*(.*)?/i';
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$pattern = '/^\\s*SHOW\\s*(COLUMNS|FIELDS)\\s*FROM\\s*(.*)?/i';
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if (preg_match($pattern_like, $this->_query, $matches)) {
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$table_name = str_replace("'", "", trim($matches[2]));
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$column_name = str_replace("'", "", trim($matches[3]));
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$query_string = "SELECT sql FROM sqlite_master WHERE tbl_name='$table_name' AND sql LIKE '%$column_name%'";
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$this->_query = $query_string;
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} elseif (preg_match($pattern, $this->_query, $matches)) {
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$table_name = $matches[2];
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$query_string = preg_replace($pattern, "PRAGMA table_info($table_name)", $this->_query);
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$this->_query = $query_string;
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}
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}
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/**
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* method to execute SHOW INDEX query
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*/
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private function _handle_show_index() {
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$_columns = array(// No, you'll get no meaningful information..
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'Key_name' => 'name',
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);
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$pattern_0 = '/^\\s*SHOW\\s*(?:INDEX|INDEXES|KEYS)\\s*FROM\\s*(\\w+)?\\s*WHERE\\s*(.*)$/im';
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$pattern_1 = '/^\\s*SHOW\\s*(?:INDEX|INDEXES|KEYS)\\s*FROM\\s*(\\w+)?/im';
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if (preg_match($pattern_0, $this->_query, $match_0)) {
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$table_name = str_replace("'", '', $match_0[1]);
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list($key, $value) = explode('=', $match_0[2]);
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$key = trim($key);
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$value = preg_replace("/[\';]/", '', $value);
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$value = trim($value);
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if (array_key_exists($key, $_columns)) {
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$key = $_columns[$key];
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$where_clause = 'AND ' . $key . ' LIKE ' . "'" . $value . "%'";
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} else {
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$where_clause = '';
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}
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$this->_query = "SELECT * FROM sqlite_master WHERE tbl_name='$table_name' $where_clause";
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} elseif (preg_match($pattern_1, $this->_query, $match_1)) {
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$table_name = preg_replace("/[\';]/", '', $match_1[1]);
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$table_name = trim($table_name);
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$this->_query = "SELECT * FROM sqlite_master WHERE tbl_name='$table_name'";
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}
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}
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/**
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* function to rewrite ON DUPLICATE KEY UPDATE statement
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* I use SELECT query and check if INSERT is allowed or not
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* Rewriting procedure looks like a detour, but I've got another way.
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*
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* @return void
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*/
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private function _execute_duplicate_key_update() {
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$update = false;
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$unique_keys_for_cond = array();
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$unique_keys_for_check = array();
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$pattern = '/^\\s*INSERT\\s*INTO\\s*(\\w+)?\\s*(.*)\\s*ON\\s*DUPLICATE\\s*KEY\\s*UPDATE\\s*(.*)$/ims';
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if (preg_match($pattern, $this->_query, $match_0)) {
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$table_name = trim($match_0[1]);
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$insert_data = trim($match_0[2]);
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$update_data = trim($match_0[3]);
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// prepare two unique key data for the table
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// 1. array('col1', 'col2, col3', etc) 2. array('col1', 'col2', 'col3', etc)
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$_wpdb = new PDODB();
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$indexes = $_wpdb->get_results("SHOW INDEX FROM {$table_name}");
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if (!empty($indexes)) {
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foreach ($indexes as $index) {
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if ($index->Non_unique == 0) {
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$unique_keys_for_cond[] = $index->Column_name;
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if (strpos($index->Column_name, ',') !== false) {
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$unique_keys_for_check = array_merge($unique_keys_for_check, explode(',', $index->Column_name));
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} else {
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$unique_keys_for_check[] = $index->Column_name;
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}
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}
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}
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$unique_keys_for_check = array_map('trim', $unique_keys_for_check);
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} else {
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// Without unique key or primary key, UPDATE statement will affect all the rows!
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$query = 'INSERT INTO '.$table_name.' '.$insert_data;
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$this->_query = $query;
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$_wpdb = null;
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return;
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}
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// data check
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if (preg_match('/^\((.*)\)\\s*VALUES\\s*\((.*)\)$/ims', $insert_data, $match_1)) {
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$col_array = explode(',', $match_1[1]);
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$ins_data_array = explode(',', $match_1[2]);
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foreach ($col_array as $col) {
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$val = trim(array_shift($ins_data_array));
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$ins_data_assoc[trim($col)] = $val;
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}
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// $ins_data_assoc = array_combine($col_array, $ins_array);
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$condition = '';
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foreach ($unique_keys_for_cond as $unique_key) {
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if (strpos($unique_key, ',') !== false) {
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$unique_key_array = explode(',', $unique_key);
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$counter = count($unique_key_array);
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for ($i = 0; $i < $counter; ++$i) {
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$col = trim($unique_key_array[$i]);
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if (isset($ins_data_assoc[$col]) && $i == $counter - 1) {
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$condition .= $col . '=' . $ins_data_assoc[$col] . ' OR ';
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} elseif (isset($ins_data_assoc[$col])) {
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$condition .= $col . '=' . $ins_data_assoc[$col] . ' AND ';
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} else {
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continue;
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}
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}
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// $condition = rtrim($condition, ' AND ');
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} else {
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$col = trim($unique_key);
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if (isset($ins_data_assoc[$col])) {
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$condition .= $col . '=' . $ins_data_assoc[$col] . ' OR ';
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} else {
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continue;
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}
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}
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}
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$condition = rtrim($condition, ' OR ');
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$test_query = "SELECT * FROM {$table_name} WHERE {$condition}";
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$results = $_wpdb->query($test_query);
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$_wpdb = null;
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if ($results == 0) {
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$this->_query = 'INSERT INTO '.$table_name.' '.$insert_data;
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return;
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} else {
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// change (col, col...) values (data, data...) to array(col=>data, col=>data...)
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if (preg_match('/^\((.*)\)\\s*VALUES\\s*\((.*)\)$/im', $insert_data, $match_2)) {
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$col_array = explode(',', $match_2[1]);
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$ins_array = explode(',', $match_2[2]);
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$count = count($col_array);
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for ($i = 0; $i < $count; $i++) {
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|
$col = trim($col_array[$i]);
|
|
$val = trim($ins_array[$i]);
|
|
$ins_array_assoc[$col] = $val;
|
|
}
|
|
}
|
|
// change col = data, col = data to array(col=>data, col=>data)
|
|
// some plugins have semi-colon at the end of the query
|
|
$update_data = rtrim($update_data, ';');
|
|
$tmp_array = explode(',', $update_data);
|
|
foreach ($tmp_array as $pair) {
|
|
list($col, $value) = explode('=', $pair);
|
|
$col = trim($col);
|
|
$value = trim($value);
|
|
$update_array_assoc[$col] = $value;
|
|
}
|
|
// change array(col=>values(col)) to array(col=>data)
|
|
foreach ($update_array_assoc as $key => &$value) {
|
|
if (preg_match('/^VALUES\\s*\((.*)\)$/im', $value, $match_3)) {
|
|
$col = trim($match_3[1]);
|
|
$value = $ins_array_assoc[$col];
|
|
}
|
|
}
|
|
foreach ($ins_array_assoc as $key => $val) {
|
|
if (in_array($key, $unique_keys_for_check)) {
|
|
$where_array[] = $key . '=' . $val;
|
|
}
|
|
}
|
|
$update_strings = '';
|
|
foreach ($update_array_assoc as $key => $val) {
|
|
if (in_array($key, $unique_keys_for_check)) {
|
|
$where_array[] = $key . '=' . $val;
|
|
} else {
|
|
$update_strings .= $key . '=' . $val . ',';
|
|
}
|
|
}
|
|
$update_strings = rtrim($update_strings, ',');
|
|
$unique_where = array_unique($where_array, SORT_REGULAR);
|
|
$where_string = ' WHERE ' . implode(' AND ', $unique_where);
|
|
// $where_string = ' WHERE ' . rtrim($where_string, ',');
|
|
$update_query = 'UPDATE ' . $table_name . ' SET ' . $update_strings . $where_string;
|
|
$this->_query = $update_query;
|
|
}
|
|
}
|
|
} else {
|
|
// wordaround...
|
|
$pattern = '/ ON DUPLICATE KEY UPDATE.*$/im';
|
|
$replace_query = preg_replace($pattern, '', $this->_query);
|
|
$replace_query = str_ireplace('INSERT ', 'INSERT OR REPLACE ', $replace_query);
|
|
$this->_query = $replace_query;
|
|
}
|
|
}
|
|
|
|
private function _rewrite_between() {
|
|
$pattern = '/\\s*(\\w+)?\\s*BETWEEN\\s*([^\\s]*)?\\s*AND\\s*([^\\s]*)?\\s*/ims';
|
|
if (preg_match($pattern, $this->_query, $match)) {
|
|
$column_name = trim($match[1]);
|
|
$min_value = trim($match[2]);
|
|
$max_value = trim($match[3]);
|
|
$replacement = " $column_name >= '$min_value' AND $column_name <= '$max_value'";
|
|
$this->_query = str_ireplace($match[0], $replacement, $this->_query);
|
|
}
|
|
}
|
|
/**
|
|
* workaround function to avoid DELETE with JOIN
|
|
* wp-admin/includes/upgrade.php contains 'DELETE ... JOIN' statement.
|
|
* This query can't be replaced with regular expression or udf, so we
|
|
* replace all the statement with another.
|
|
*/
|
|
private function _delete_workaround() {
|
|
global $wpdb;
|
|
// $pattern = "DELETE o1 FROM $wpdb->options AS o1 JOIN $wpdb->options AS o2 USING (option_name) WHERE o2.option_id > o1.option_id";
|
|
$pattern = "DELETE o1 FROM $wpdb->options AS o1 JOIN $wpdb->options AS o2";
|
|
$rewritten = "DELETE FROM $wpdb->options WHERE option_id IN (SELECT MIN(option_id) FROM $wpdb->options GROUP BY option_name HAVING COUNT(*) > 1)";
|
|
if (stripos($this->_query, $pattern) !== false) {
|
|
$this->_query = $rewritten;
|
|
}
|
|
}
|
|
}
|
|
?>
|