sqlite-integration/query_alter.class.php

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<?php
/**
* The class for manipulating ALTER query
* newly supports multiple variants
* @package SQLite Integration
* @author Kojima Toshiyasu
*/
class AlterQuery {
public $_query = null;
public function rewrite_query($query, $query_type) {
if (stripos($query, $query_type) === false) {
return false;
}
$query = str_replace('`', '', $query);
if (preg_match('/^\\s*(ALTER\\s*TABLE)\\s*(\\w+)?\\s*/ims', $query, $match)) {
$tmp_query = array();
$tokens = array();
$re_command = '';
$command = str_ireplace($match[0], '', $query);
$tmp_tokens['query_type'] = trim($match[1]);
$tmp_tokens['table_name'] = trim($match[2]);
// $command_array = $this->split_multiple($command);
$command_array = explode(',', $command);
$single_command = array_shift($command_array);
if (!empty($command_array)) {
$re_command = 'ALTER TABLE ' . $tmp_tokens['table_name'] . ' ';
$re_command .= implode(',', $command_array);
}
$command_tokens = $this->command_tokenizer($single_command);
if (!empty($command_tokens)) {
$tokens = array_merge($tmp_tokens, $command_tokens);
} else {
$this->_query = 'SELECT 1=1';
return $this->_query;
}
// foreach ($tokens as $token) {
$command_name = strtolower($tokens['command']);
switch ($command_name) {
case 'add column': case 'rename to': case 'add index': case 'drop index':
$tmp_query = $this->handle_single_command($tokens);
break;
case 'add primary key':
$tmp_query = $this->handle_add_primary_key($tokens);
break;
case 'drop primary key':
$tmp_query = $this->handle_drop_primary_key($tokens);
break;
case 'modify column':
$tmp_query = $this->handle_modify_command($tokens);
break;
case 'change column':
$tmp_query = $this->handle_change_command($tokens);
break;
case 'alter column':
$tmp_query = $this->handle_alter_command($tokens);
break;
default:
break;
}
// }
if (!is_array($tmp_query)) {
$this->_query[] = $tmp_query;
} else {
$this->_query = $tmp_query;
}
if ($re_command != '') {
$this->_query = array_merge($this->_query, array('recursion' => $re_command));
}
} else {
$this->_query = 'SELECT 1=1';
}
return $this->_query;
}
private function command_tokenizer($command) {
$tokens = array();
if (preg_match('/^(ADD|DROP|RENAME|MODIFY|CHANGE|ALTER)\\s*(\\w+)?\\s*(\\w+(\(.+\)|))?\\s*/ims', $command, $match)) {
$the_rest = str_ireplace($match[0], '', $command);
$match_1 = trim($match[1]);
$match_2 = trim($match[2]);
$match_3 = isset($match[3]) ? trim($match[3]) : '';
switch (strtolower($match_1)) {
case 'add':
if (in_array(strtolower($match_2), array('fulltext', 'constraint', 'foreign'))) {
break;
} elseif (stripos('column', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2;
$tokens['column_name'] = $match_3;
$tokens['column_def'] = trim($the_rest);
} elseif (stripos('primary', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2.' '.$match_3;
$tokens['column_name'] = $the_rest;
} elseif (stripos('unique', $match_2) !== false) {
list($index_name, $col_name) = preg_split('/[\(\)]/s', trim($the_rest), -1, PREG_SPLIT_DELIM_CAPTURE);
$tokens['unique'] = true;
$tokens['command'] = $match_1.' '.$match_3;
$tokens['index_name'] = trim($index_name);
$tokens['column_name'] = '('.trim($col_name).')';
} elseif (in_array(strtolower($match_2), array('index', 'key'))) {
$tokens['command'] = $match_1.' '.$match_2;
if ($match_3 == '') {
$tokens['index_name'] = str_replace(array('(', ')'), '', $the_rest);
} else {
$tokens['index_name'] = $match_3;
}
$tokens['column_name'] = trim($the_rest);
} else {
$tokens['command'] = $match_1.' COLUMN';
$tokens['column_name'] = $match_2;
$tokens['column_def'] = $match_3.' '.$the_rest;
}
break;
case 'drop':
if (stripos('column', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2;
$tokens['column_name'] = trim($match_3);
} elseif (stripos('primary', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2.' '.$match_3;
} elseif (in_array(strtolower($match_2), array('index', 'key'))) {
$tokens['command'] = $match_1.' '.$match_2;
$tokens['index_name'] = $match_3;
} elseif (stripos('primary', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2.' '.$match_3;
} else {
$tokens['command'] = $match_1.' COLUMN';
$tokens['column_name'] = $match_2;
}
break;
case 'rename':
if (stripos('to', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2;
$tokens['column_name'] = $match_3;
} else {
$tokens['command'] = $match_1.' TO';
$tokens['column_name'] = $match_2;
}
break;
case 'modify':
if (stripos('column', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2;
$tokens['column_name'] = $match_3;
$tokens['column_def'] = trim($the_rest);
} else {
$tokens['command'] = $match_1.' COLUMN';
$tokens['column_name'] = $match_2;
$tokens['column_def'] = $match_3.' '.trim($the_rest);
}
break;
case 'change':
$the_rest = trim($the_rest);
if (stripos('column', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2;
$tokens['old_column'] = $match_3;
list($new_col) = explode(' ', $the_rest);
$tmp_col = preg_replace('/\(.+?\)/im', '', $new_col);
if (array_key_exists(strtolower($tmp_col), $this->array_types)) {
$tokens['column_def'] = $the_rest;
} else {
$tokens['new_column'] = $new_col;
$col_def = str_replace($new_col, '', $the_rest);
$tokens['column_def'] = trim($col_def);
}
} else {
$tokens['command'] = $match_1.' column';
$tokens['old_column'] = $match_2;
$tmp_col = preg_replace('/\(.+?\)/im', '', $match_3);
if (array_key_exists(strtolower($tmp_col), $this->array_types)) {
$tokens['column_def'] = $match_3 . ' ' . $the_rest;
} else {
$tokens['new_column'] = $match_3;
$tokens['column_def'] = $the_rest;
}
}
break;
case 'alter':
if (stripos('column', $match_2) !== false) {
$tokens['command'] = $match_1.' '.$match_2;
$tokens['column_name'] = $match_3;
list($set_or_drop) = explode(' ', $the_rest);
if (stripos('set', $set_or_drop) !== false) {
$tokens['default_command'] = 'SET DEFAULT';
$default_value = str_ireplace('set default', '', $the_rest);
$tokens['default_value'] = trim($default_value);
} else {
$tokens['default_command'] = 'DROP DEFAULT';
}
} else {
$tokens['command'] = $match_1.' COLUMN';
$tokens['column_name'] = $match_2;
if (stripos('set', $match_3) !== false) {
$tokens['default_command'] = 'SET DEFAULT';
$default_value = str_ireplace('default', '', $the_rest);
$tokens['default_value'] = trim($default_value);
} else {
$tokens['default_command'] = 'DROP DEFAULT';
}
}
break;
default:
break;
}
return $tokens;
}
}
private function split_multiple($command) {
$out = true;
$command_array = array();
$command_string = '';
$tokens = preg_split('/\b/s', $command, -1, PREG_SPLIT_DELIM_CAPTURE);
foreach ($tokens as $token) {
switch (trim($token)) {
case ';':
break;
case '(':
$command_string .= $token;
$out = false;
break;
case ')':
$command_string .= $token;
$out = true;
break;
case '),':
$command_array[] = $command_string;
$command_string = '';
$out = true;
break;
case ',':
if ($out) {
$command_array[] = $command_string;
$command_string = '';
} else {
$command_string .= $token;
}
break;
default:
$command_string .= $token;
break;
}
}
if (!empty($command_string)) {
$command_array[] = $command_string;
}
return $command_array;
}
private function handle_single_command($queries) {
$tokenized_query = $queries;
if (stripos($tokenized_query['command'], 'add column') !== false) {
$column_def = $this->convert_field_types($tokenized_query['column_name'], $tokenized_query['column_def']);
$query = "ALTER TABLE {$tokenized_query['table_name']} ADD COLUMN {$tokenized_query['column_name']} $column_def";
} elseif (stripos($tokenized_query['command'], 'rename') !== false) {
$query = "ALTER TABLE {$tokenized_query['table_name']} RENAME TO {$tokenized_query['column_name']}";
} elseif (stripos($tokenized_query['command'], 'add index') !== false) {
$unique = isset($tokenized_query['unique']) ? 'UNIQUE' : '';
$query = "CREATE $unique INDEX IF NOT EXISTS {$tokenized_query['index_name']} ON {$tokenized_query['table_name']} {$tokenized_query['column_name']}";
} elseif (stripos($tokenized_query['command'], 'drop index') !== false) {
$query = "DROP INDEX IF EXISTS {$tokenized_query['index_name']}";
} else {
$query = 'SELECT 1=1';
}
return $query;
}
private function handle_add_primary_key($queries) {
$tokenized_query = $queries;
$tbl_name = $tokenized_query['table_name'];
$temp_table = 'temp_'.$tokenized_query['table_name'];
$_wpdb = new PDODB();
$query_obj = $_wpdb->get_results("SELECT sql FROM sqlite_master WHERE tbl_name='$tbl_name'");
$_wpdb = null;
for ($i = 0; $i < count($query_obj); $i++) {
$index_queries[$i] = $query_obj[$i]->sql;
}
$table_query = array_shift($index_queries);
$table_query = str_replace($tokenized_query['table_name'], $temp_table, $table_query);
$table_query = rtrim($table_query, ')');
$table_query = ", PRIMARY KEY {$tokenized_query['column_name']}";
$query[] = $table_query;
$query[] = "INSERT INTO $temp_table SELECT * FROM {$tokenized_query['table_name']}";
$query[] = "DROP TABLE IF EXISTS {$tokenized_query['table_name']}";
$query[] = "ALTER TABLE $temp_table RENAME TO {$tokenized_query['table_name']}";
foreach ($index_queries as $index) {
$query[] = $index;
}
return $query;
}
private function handle_drop_primary_key($queries) {
$tokenized_query = $queries;
$temp_table = 'temp_'.$tokenized_query['table_name'];
$_wpdb = new PDODB();
$query_obj = $_wpdb->get_results("SELECT sql FROM sqlite_master WHERE tbl_name='{$tokenized_query['table_name']}'");
$_wpdb = null;
for ($i = 0; $i < count($query_obj); $i++) {
$index_queries[$i] = $query_obj[$i]->sql;
}
$table_query = array_shift($index_queries);
$pattern1 = '/^\\s*PRIMARY\\s*KEY\\s*\(.*\)/im';
$pattern2 = '/^\\s*.*(PRIMARY\\s*KEY\\s*(:?AUTOINCREMENT|))\\s*(?!\()/im';
if (preg_match($pattern1, $table_query, $match)) {
$table_query = str_replace($match[0], '', $table_query);
} elseif (preg_match($pattern2, $table_query, $match)) {
$table_query = str_replace($match[1], '', $table_query);
}
$table_query = str_replace($tokenized_query['table_name'], $temp_table, $table_query);
$query[] = $table_query;
$query[] = "INSERT INTO $temp_table SELECT * FROM {$tokenized_query['table_name']}";
$query[] = "DROP TABLE IF EXISTS {$tokenized_query['table_name']}";
$query[] = "ALTER TABLE $temp_table RENAME TO {$tokenized_query['table_name']}";
foreach ($index_queries as $index) {
$query[] = $index;
}
return $query;
}
private function handle_modify_command($queries) {
$tokenized_query = $queries;
$temp_table = 'temp_'.$tokenized_query['table_name'];
$column_def = $this->convert_field_types($tokenized_query['column_name'], $tokenized_query['column_def']);
$_wpdb = new PDODB();
$query_obj = $_wpdb->get_results("SELECT sql FROM sqlite_master WHERE tbl_name='{$tokenized_query['table_name']}'");
$_wpdb = null;
for ($i =0; $i < count($query_obj); $i++) {
$index_queries[$i] = $query_obj[$i]->sql;
}
$create_query = array_shift($index_queries);
if (stripos($create_query, $tokenized_query['column_name']) === false) {
return 'SELECT 1=1';
} elseif (preg_match("/{$tokenized_query['column_name']}\\s*{$column_def}\\s*[,)]/i", $create_query)) {
return 'SELECT 1=1';
}
$create_query = preg_replace("/{$tokenized_query['table_name']}/i", $temp_table, $create_query);
if (preg_match("/\\b{$tokenized_query['column_name']}\\s*.*(?=,)/ims", $create_query)) {
$create_query = preg_replace("/\\b{$tokenized_query['column_name']}\\s*.*(?=,)/ims", "{$tokenized_query['column_name']} {$column_def}", $create_query);
} elseif (preg_match("/\\b{$tokenized_query['column_name']}\\s*.*(?=\))/ims", $create_query)) {
$create_query = preg_replace("/\\b{$tokenized_query['column_name']}\\s*.*(?=\))/ims", "{$tokenized_query['column_name']} {$column_def}", $create_query);
}
$query[] = $create_query;
$query[] = "INSERT INTO $temp_table SELECT * FROM {$tokenized_query['table_name']}";
$query[] = "DROP TABLE IF EXISTS {$tokenized_query['table_name']}";
$query[] = "ALTER TABLE $temp_table RENAME TO {$tokenized_query['table_name']}";
foreach ($index_queries as $index) {
$query[] = $index;
}
return $query;
}
private function handle_change_command($queries) {
$col_check = false;
$old_fields = '';
$new_fields = '';
$tokenized_query = $queries;
$temp_table = 'temp_'.$tokenized_query['table_name'];
if (isset($tokenized_query['new_column'])) {
$column_name = $tokenized_query['new_column'];
} else {
$column_name = $tokenized_query['old_column'];
}
$column_def = $this->convert_field_types($column_name, $tokenized_query['column_def']);
$_wpdb = new PDODB();
$col_obj = $_wpdb->get_results("SHOW COLUMNS FROM {$tokenized_query['table_name']}");
foreach ($col_obj as $col) {
if (stripos($col->Field, $tokenized_query['old_column']) !== false) $col_check = true;
$old_fields .= $col->Field . ',';
}
if ($col_check == false) {
$_wpdb = null;
return 'SELECT 1=1';
}
$old_fields = rtrim($old_fields, ',');
$new_fields = str_ireplace($tokenized_query['old_column'], $column_name, $old_fields);
$query_obj = $_wpdb->get_results("SELECT sql FROM sqlite_master WHERE tbl_name='{$tokenized_query['table_name']}'");
$_wpdb = null;
for ($i = 0; $i < count($query_obj); $i++) {
$index_queries[$i] = $query_obj[$i]->sql;
}
$create_query = array_shift($index_queries);
$create_query = preg_replace("/{$tokenized_query['table_name']}/i", $temp_table, $create_query);
if (preg_match("/\\b{$tokenized_query['old_column']}\\s*(.+?)(?=,)/ims", $create_query, $match)) {
if (stripos(trim($match[1]), $column_def) !== false) {
return 'SELECT 1=1';
} else {
$create_query = preg_replace("/\\b{$tokenized_query['old_column']}\\s*.+?(?=,)/ims", "{$column_name} {$column_def}", $create_query, 1);
}
} elseif (preg_match("/\\b{$tokenized_query['old_column']}\\s*(.+?)(?=\))/ims", $create_query, $match)) {
if (stripos(trim($match[1]), $column_def) !== false) {
return 'SELECT 1=1';
} else {
$create_query = preg_replace("/\\b{$tokenized_query['old_column']}\\s*.*(?=\))/ims", "{$column_name} {$column_def}", $create_query, 1);
}
}
$query[] = $create_query;
$query[] = "INSERT INTO $temp_table ($new_fields) SELECT $old_fields FROM {$tokenized_query['table_name']}";
$query[] = "DROP TABLE IF EXISTS {$tokenized_query['table_name']}";
$query[] = "ALTER TABLE $temp_table RENAME TO {$tokenized_query['table_name']}";
foreach ($index_queries as $index) {
$query[] = $index;
}
return $query;
}
private function handle_alter_command($queries) {
$tokenized_query = $queries;
$temp_table = 'temp_'.$tokenized_query['table_name'];
if (isset($tokenized_query['default_value'])) {
$def_value = $this->convert_field_types($tokenized_query['column_name'], $tokenized_query['default_value']);
$def_value = 'DEFAULT '.$def_value;
} else {
$def_value = null;
}
$_wpdb = new PDODB();
$query_obj = $_wpdb->get_results("SELECT sql FROM sqlite_master WHERE tbl_name='{$tokenized_query['table_name']}'");
$_wpdb = null;
for ($i =0; $i < count($query_obj); $i++) {
$index_queries[$i] = $query_obj[$i]->sql;
}
$create_query = array_shift($index_queries);
if (stripos($create_query, $tokenized_query['column_name']) === false) {
return 'SELECT 1=1';
}
if (preg_match("/\\s*({$tokenized_query['column_name']})\\s*(.*)?(DEFAULT\\s*.*)[,)]/im", $create_query, $match)) {
$col_name = trim($match[1]);
$col_def = trim($match[2]);
$col_def_esc = str_replace(array('(', ')'), array('\(', '\)'), $col_def);
$checked_col_def = $this->convert_field_types($col_name, $col_def);
$old_default = trim($match[3]);
$pattern = "/$col_name\\s*$col_def_esc\\s*$old_default/im";
if (is_null($def_value)) {
$replacement = $col_name . ' ' . $checked_col_def;
} else {
$replacement = $col_name . ' ' . $checked_col_def . ' ' . $def_value;
}
$create_query = preg_replace($pattern, $replacement, $create_query);
$create_query = str_ireplace($tokenized_query['table_name'], $temp_table, $create_query);
} elseif (preg_match("/\\s*({$tokenized_query['column_name']})\\s*(.*)?[,)]/im", $create_query, $match)) {
$col_name = trim($match[1]);
$col_def = trim($match[2]);
$col_def_esc = str_replace(array('(', ')'), array('\(', '\)'), $col_def);
$checked_col_def = $this->convert_field_types($col_name, $col_def);
$pattern = "/$col_name\\s*$col_def_esc/im";
if (is_null($def_value)) {
$replacement = $col_name . ' ' . $checked_col_def;
} else {
$replacement = $col_name . ' ' . $checked_col_def . ' ' . $def_value;
}
$create_query = preg_replace($pattern, $replacement, $create_query);
$create_query = str_ireplace($tokenized_query['table_name'], $temp_table, $create_query);
} else {
return 'SELECT 1=1';
}
$query[] = $create_query;
$query[] = "INSERT INTO $temp_table SELECT * FROM {$tokenized_query['table_name']}";
$query[] = "DROP TABLE IF EXISTS {$tokenized_query['table_name']}";
$query[] = "ALTER TABLE $temp_table RENAME TO {$tokenized_query['table_name']}";
foreach ($index_queries as $index) {
$query[] = $index;
}
return $query;
}
/**
* Change the field definition to SQLite compatible data type.
* @param string $col_name
* @param string $col_def
* @return string
*/
private function convert_field_types($col_name, $col_def){
$array_curtime = array('current_timestamp', 'current_time', 'current_date');
$array_reptime = array("'0000-00-00 00:00:00'", "'0000-00-00 00:00:00'", "'0000-00-00'");
$def_string = str_replace('`', '', $col_def);
foreach ($this->array_types as $o=>$r){
$pattern = "/\\b$o\\s*(\([^\)]*\)*)?\\s*/ims";
if (preg_match($pattern, $def_string)) {
$def_string = preg_replace($pattern, "$r ", $def_string);
break;
}
}
$def_string = preg_replace('/unsigned/im', '', $def_string);
$def_string = preg_replace('/auto_increment/im', 'PRIMARY KEY AUTOINCREMENT', $def_string);
// when you use ALTER TABLE ADD, you can't use current_*. so we replace
$def_string = str_ireplace($array_curtime, $array_reptime, $def_string);
// colDef is enum
$pattern_enum = '/enum\((.*?)\)([^,\)]*)/ims';
if (preg_match($pattern_enum, $col_def, $matches)) {
$def_string = 'TEXT' . $matches[2] . ' CHECK (' . $col_name . ' IN (' . $matches[1] . '))';
}
return $def_string;
}
private $array_types = array(
'bit' => 'INTEGER', 'bool' => 'INTEGER',
'boolean' => 'INTEGER', 'tinyint' => 'INTEGER',
'smallint' => 'INTEGER', 'mediumint' => 'INTEGER',
'bigint' => 'INTEGER', 'integer' => 'INTEGER',
'int' => 'INTEGER', 'float' => 'REAL',
'double' => 'REAL', 'decimal' => 'REAL',
'dec' => 'REAL', 'numeric' => 'REAL',
'fixed' => 'REAL', 'datetime' => 'TEXT',
'date' => 'TEXT', 'timestamp' => 'TEXT',
'time' => 'TEXT', 'year' => 'TEXT',
'varchar' => 'TEXT', 'char' => 'TEXT',
'varbinary' => 'BLOB', 'binary' => 'BLOB',
'tinyblob' => 'BLOB', 'mediumblob' => 'BLOB',
'longblob' => 'BLOB', 'blob' => 'BLOB',
'tinytext' => 'TEXT', 'mediumtext' => 'TEXT',
'longtext' => 'TEXT', 'text' => 'TEXT'
);
}
?>