285 lines
9.6 KiB
PHP
285 lines
9.6 KiB
PHP
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<?php
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/**
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* @package SQLite Integration
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* @version 1.0
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* @author Kojima Toshiyasu, Justin Adie
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*/
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/**
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* Provides a class for rewriting create queries
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* this class borrows its inspiration from the work done on tikiwiki.
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*/
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class CreateQuery{
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private $_query = '';
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private $index_queries = array();
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private $_errors = array();
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private $table_name = '';
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private $has_primary_key = false;
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/**
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* initialises the object properties
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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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$this->strip_backticks();
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$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_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 for getting the table name from the create query.
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* taken from PDO for WordPress
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* we don't need 'IF NOT EXISTS', so we changed the pattern.
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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($matches[1]);
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}
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}
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/**
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* Method for changing the field type to SQLite compatible type.
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*/
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private function rewrite_field_types(){
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$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*/imsx';
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$this->_query = preg_replace($pattern, " $r ", $this->_query);
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}
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}
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/**
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* Method for stripping the comments from the SQL statement
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*/
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private function rewrite_comments(){
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$this->_query = preg_replace("/# --------------------------------------------------------/","-- ******************************************************",$this->_query);
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$this->_query = preg_replace("/#/","--",$this->_query);
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}
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/**
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* Method for stripping the engine and other stuffs
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*/
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private function rewrite_engine_info(){
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$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",'',$this->_query);
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}
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/**
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* Method for stripping unsigned
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*/
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private function rewrite_unsigned(){
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$this->_query = preg_replace('/\\bunsigned\\b/ims', ' ', $this->_query);
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}
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/**
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* Method for rewriting auto_increment
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* if the field type is 'integer primary key', it is automatically autoincremented
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*/
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private function rewrite_autoincrement(){
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$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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$this->has_primary_key = true;
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}
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}
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/**
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* Method for rewriting primary key
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*/
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private function rewrite_primary_key(){
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if ($this->has_primary_key) {
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$this->_query = preg_replace('/\\bprimary key\\s*\([^\)]*\)/ims', ' ', $this->_query);
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} else {
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// If primary key has an index name, we remove that name.
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$this->_query = preg_replace('/\\bprimary\\s*key\\s*.*?\\s*(\(.*?\))/im', 'PRIMARY KEY \\1', $this->_query);
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}
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}
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/**
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* Method for rewriting unique key
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*/
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private function rewrite_unique_key(){
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$this->_query = preg_replace_callback('/\\bunique key\\b([^\(]*)(\([^\)]*\))/ims', 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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* @param array $matches an array of matches from the Regex
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*/
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private function _rewrite_unique_key($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 = $this->table_name;
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$_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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* SQLite doesn't support enum, so we change it to check constraint
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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'), $this->_query);
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}
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/**
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* Method for the callback function rewrite_enum and rewrite_set
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*/
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private function _rewrite_enum($matches){
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$output = $matches[1] . ' ' . $matches[2]. ' TEXT '. $matches[4].' CHECK ('.$matches[2].' IN ('.$matches[3].')) ';
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return $output;
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}
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/**
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* Method for rewriting usage of set
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* whilst not identical to enum, they are similar and sqlite does not
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* support either.
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*/
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private function rewrite_set(){
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$pattern = '/\b(\w)*\bset\\s*\((.*?)\)\\s*(.*?)(,)*/ims';
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$this->_query = preg_replace_callback($pattern, array($this, '_rewrite_enum'), $this->_query);
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}
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/**
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* Method for rewriting usage of key to create an index
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* sqlite cannot create non-unique indices as part of the create query
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* so we need to create an index by hand and append it to the create query
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*/
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private function rewrite_key(){
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$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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* @param array $matches an array of matches from the Regex
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*/
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private function _rewrite_key($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 . $col_name ;
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return '';
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}
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private function _remove_length($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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* to be returned to the base class
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* @return array
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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 $return_val;
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}
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/**
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* Method to add IF NOT EXISTS to query defs
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* sometimes, if upgrade.php is being called, wordpress seems to want to run
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* new create queries. this stops the query from throwing an error and halting
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* output
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*/
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private function add_if_not_exists(){
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$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 ticks
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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('`', '', $query);
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}
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}
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/**
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* Method to remove the character set information from within mysql queries
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*/
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private function rewrite_character_set(){
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$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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