543 lines
17 KiB
PHP
543 lines
17 KiB
PHP
<?php
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/**
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* StatusNet, the distributed open-source microblogging tool
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*
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* Database schema utilities
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*
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* PHP version 5
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*
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* LICENCE: This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* @category Database
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2009 StatusNet, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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if (!defined('STATUSNET')) {
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exit(1);
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}
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/**
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* Class representing the database schema
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*
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* A class representing the database schema. Can be used to
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* manipulate the schema -- especially for plugins and upgrade
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* utilities.
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*
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* @category Database
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* @package StatusNet
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* @author Evan Prodromou <evan@status.net>
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link http://status.net/
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*/
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class MysqlSchema extends Schema
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{
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static $_single = null;
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protected $conn = null;
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/**
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* Main public entry point. Use this to get
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* the singleton object.
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*
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* @return Schema the (single) Schema object
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*/
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static function get()
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{
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if (empty(self::$_single)) {
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self::$_single = new Schema();
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}
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return self::$_single;
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}
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/**
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* Returns a TableDef object for the table
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* in the schema with the given name.
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*
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* Throws an exception if the table is not found.
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*
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* @param string $table Name of the table to get
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*
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* @return TableDef tabledef for that table.
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* @throws SchemaTableMissingException
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*/
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public function getTableDef($table)
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{
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$def = array();
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$hasKeys = false;
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// Pull column data from INFORMATION_SCHEMA
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$columns = $this->fetchMetaInfo($table, 'COLUMNS', 'ORDINAL_POSITION');
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if (count($columns) == 0) {
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throw new SchemaTableMissingException("No such table: $table");
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}
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foreach ($columns as $row) {
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$name = $row['COLUMN_NAME'];
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$field = array();
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// warning -- 'unsigned' attr on numbers isn't given in DATA_TYPE and friends.
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// It is stuck in on COLUMN_TYPE though (eg 'bigint(20) unsigned')
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list($type, $size) = $this->reverseMapType($row['DATA_TYPE']);
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$field['type'] = $type;
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if ($size !== null) {
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$field['size'] = $size;
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}
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if ($type == 'char' || $type == 'varchar') {
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if ($row['CHARACTER_MAXIMUM_LENGTH'] !== null) {
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$field['length'] = intval($row['CHARACTER_MAXIMUM_LENGTH']);
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}
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}
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if ($type == 'numeric') {
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// Other int types may report these values, but they're irrelevant.
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// Just ignore them!
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if ($row['NUMERIC_PRECISION'] !== null) {
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$field['precision'] = intval($row['NUMERIC_PRECISION']);
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}
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if ($row['NUMERIC_SCALE'] !== null) {
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$field['scale'] = intval($row['NUMERIC_SCALE']);
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}
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}
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if ($row['IS_NULLABLE'] == 'NO') {
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$field['not null'] = true;
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}
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if ($row['COLUMN_DEFAULT'] !== null) {
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$field['default'] = $row['COLUMN_DEFAULT'];
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if ($this->isNumericType($type)) {
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$field['default'] = intval($field['default']);
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}
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}
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if ($row['COLUMN_KEY'] !== null) {
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// We'll need to look up key info...
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$hasKeys = true;
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}
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if ($row['COLUMN_COMMENT'] !== null && $row['COLUMN_COMMENT'] != '') {
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$field['description'] = $row['COLUMN_COMMENT'];
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}
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$extra = $row['EXTRA'];
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if ($extra) {
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if (preg_match('/(^|\s)auto_increment(\s|$)/i', $extra)) {
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$field['type'] = 'serial';
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}
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// $row['EXTRA'] may contain 'on update CURRENT_TIMESTAMP'
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// ^ ...... how to specify?
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}
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if ($row['CHARACTER_SET_NAME'] !== null) {
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// @fixme check against defaults?
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//$def['charset'] = $row['CHARACTER_SET_NAME'];
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//$def['collate'] = $row['COLLATION_NAME'];
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}
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$def['fields'][$name] = $field;
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}
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if ($hasKeys) {
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// INFORMATION_SCHEMA's CONSTRAINTS and KEY_COLUMN_USAGE tables give
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// good info on primary and unique keys but don't list ANY info on
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// multi-value keys, which is lame-o. Sigh.
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//
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// Let's go old school and use SHOW INDEX :D
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//
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$keyInfo = $this->fetchIndexInfo($table);
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$keys = array();
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foreach ($keyInfo as $row) {
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$name = $row['Key_name'];
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$column = $row['Column_name'];
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if (!isset($keys[$name])) {
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$keys[$name] = array();
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}
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$keys[$name][] = $column;
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if ($name == 'PRIMARY') {
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$type = 'primary key';
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} else if ($row['Non_unique'] == 0) {
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$type = 'unique keys';
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} else if ($row['Index_type'] == 'FULLTEXT') {
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$type = 'fulltext indexes';
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} else {
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$type = 'indexes';
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}
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$keyTypes[$name] = $type;
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}
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foreach ($keyTypes as $name => $type) {
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if ($type == 'primary key') {
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// there can be only one
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$def[$type] = $keys[$name];
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} else {
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$def[$type][$name] = $keys[$name];
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}
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}
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}
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return $def;
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}
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/**
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* Pull the given table properties from INFORMATION_SCHEMA.
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* Most of the good stuff is MySQL extensions.
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*
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* @return array
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* @throws Exception if table info can't be looked up
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*/
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function getTableProperties($table, $props)
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{
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$data = $this->fetchMetaInfo($table, 'TABLES');
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if ($data) {
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return $data[0];
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} else {
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throw new SchemaTableMissingException("No such table: $table");
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}
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}
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/**
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* Pull some INFORMATION.SCHEMA data for the given table.
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*
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* @param string $table
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* @return array of arrays
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*/
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function fetchMetaInfo($table, $infoTable, $orderBy=null)
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{
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$query = "SELECT * FROM INFORMATION_SCHEMA.%s " .
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"WHERE TABLE_SCHEMA='%s' AND TABLE_NAME='%s'";
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$schema = $this->conn->dsn['database'];
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$sql = sprintf($query, $infoTable, $schema, $table);
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if ($orderBy) {
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$sql .= ' ORDER BY ' . $orderBy;
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}
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return $this->fetchQueryData($sql);
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}
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/**
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* Pull 'SHOW INDEX' data for the given table.
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*
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* @param string $table
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* @return array of arrays
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*/
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function fetchIndexInfo($table)
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{
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$query = "SHOW INDEX FROM `%s`";
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$sql = sprintf($query, $table);
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return $this->fetchQueryData($sql);
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}
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/**
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* Close out a 'create table' SQL statement.
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*
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* @param array $sql
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* @param string $name
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* @param array $def
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*/
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function appendCreateTableEnd(array &$sql, $name, array $def)
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{
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$sql[] = ") ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin";
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}
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/**
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* Get the unique index key name for a given column on this table
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*/
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function _uniqueKey($tableName, $columnName)
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{
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return $this->_key($tableName, $columnName);
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}
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/**
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* Get the index key name for a given column on this table
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*/
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function _key($tableName, $columnName)
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{
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return "{$tableName}_{$columnName}_idx";
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}
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/**
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* Ensures that a table exists with the given
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* name and the given column definitions.
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*
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* If the table does not yet exist, it will
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* create the table. If it does exist, it will
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* alter the table to match the column definitions.
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*
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* @param string $tableName name of the table
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* @param array $columns array of ColumnDef
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* objects for the table
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*
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* @return boolean success flag
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*/
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public function ensureTable($tableName, $columns)
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{
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// XXX: DB engine portability -> toilet
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try {
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$td = $this->getTableDef($tableName);
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} catch (SchemaTableMissingException $e) {
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return $this->createTable($tableName, $columns);
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}
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$cur = $this->_names($td->columns);
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$new = $this->_names($columns);
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$dropIndex = array();
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$toadd = array_diff($new, $cur);
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$todrop = array_diff($cur, $new);
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$same = array_intersect($new, $cur);
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$tomod = array();
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$addIndex = array();
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$tableProps = array();
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foreach ($same as $m) {
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$curCol = $this->_byName($td->columns, $m);
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$newCol = $this->_byName($columns, $m);
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if (!$newCol->equals($curCol)) {
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$tomod[] = $newCol->name;
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continue;
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}
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// Earlier versions may have accidentally left tables at default
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// charsets which might be latin1 or other freakish things.
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if ($this->_isString($curCol)) {
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if ($curCol->charset != 'utf8') {
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$tomod[] = $newCol->name;
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continue;
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}
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}
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}
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// Find any indices we have to change...
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$curIdx = $this->_indexList($td->columns);
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$newIdx = $this->_indexList($columns);
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if ($curIdx['primary'] != $newIdx['primary']) {
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if ($curIdx['primary']) {
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$dropIndex[] = 'drop primary key';
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}
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if ($newIdx['primary']) {
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$keys = implode(',', $newIdx['primary']);
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$addIndex[] = "add constraint primary key ($keys)";
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}
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}
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$dropUnique = array_diff($curIdx['uniques'], $newIdx['uniques']);
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$addUnique = array_diff($newIdx['uniques'], $curIdx['uniques']);
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foreach ($dropUnique as $columnName) {
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$dropIndex[] = 'drop key ' . $this->_uniqueKey($tableName, $columnName);
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}
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foreach ($addUnique as $columnName) {
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$addIndex[] = 'add constraint unique key ' . $this->_uniqueKey($tableName, $columnName) . " ($columnName)";;
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}
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$dropMultiple = array_diff($curIdx['indices'], $newIdx['indices']);
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$addMultiple = array_diff($newIdx['indices'], $curIdx['indices']);
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foreach ($dropMultiple as $columnName) {
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$dropIndex[] = 'drop key ' . $this->_key($tableName, $columnName);
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}
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foreach ($addMultiple as $columnName) {
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$addIndex[] = 'add key ' . $this->_key($tableName, $columnName) . " ($columnName)";
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}
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// Check for table properties: make sure we're using a sane
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// engine type and charset/collation.
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// @fixme make the default engine configurable?
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$oldProps = $this->getTableProperties($tableName, array('ENGINE', 'TABLE_COLLATION'));
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if (strtolower($oldProps['ENGINE']) != 'innodb') {
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$tableProps['ENGINE'] = 'InnoDB';
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}
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if (strtolower($oldProps['TABLE_COLLATION']) != 'utf8_bin') {
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$tableProps['DEFAULT CHARSET'] = 'utf8';
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$tableProps['COLLATE'] = 'utf8_bin';
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}
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if (count($dropIndex) + count($toadd) + count($todrop) + count($tomod) + count($addIndex) + count($tableProps) == 0) {
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// nothing to do
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return true;
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}
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// For efficiency, we want this all in one
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// query, instead of using our methods.
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$phrase = array();
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foreach ($dropIndex as $indexSql) {
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$phrase[] = $indexSql;
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}
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foreach ($toadd as $columnName) {
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$cd = $this->_byName($columns, $columnName);
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$phrase[] = 'ADD COLUMN ' . $this->_columnSql($cd);
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}
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foreach ($todrop as $columnName) {
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$phrase[] = 'DROP COLUMN ' . $columnName;
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}
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foreach ($tomod as $columnName) {
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$cd = $this->_byName($columns, $columnName);
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$phrase[] = 'MODIFY COLUMN ' . $this->_columnSql($cd);
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}
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foreach ($addIndex as $indexSql) {
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$phrase[] = $indexSql;
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}
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foreach ($tableProps as $key => $val) {
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$phrase[] = "$key=$val";
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}
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$sql = 'ALTER TABLE ' . $tableName . ' ' . implode(', ', $phrase);
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common_log(LOG_DEBUG, __METHOD__ . ': ' . $sql);
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$res = $this->conn->query($sql);
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if (PEAR::isError($res)) {
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throw new Exception($res->getMessage());
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}
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return true;
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}
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/**
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* Is this column a string type?
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*/
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private function _isString(array $cd)
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{
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$strings = array('char', 'varchar', 'text');
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return in_array(strtolower($cd['type']), $strings);
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}
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/**
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* Return the proper SQL for creating or
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* altering a column.
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*
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* Appropriate for use in CREATE TABLE or
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* ALTER TABLE statements.
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*
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* @param ColumnDef $cd column to create
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*
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* @return string correct SQL for that column
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*/
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function columnSql(array $cd)
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{
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$line = array();
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$line[] = parent::columnSql($cd);
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if ($cd['type'] == 'serial') {
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$line[] = 'auto_increment';
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}
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if (!empty($cd['description'])) {
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$line[] = 'comment';
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$line[] = $this->quoteValue($cd['description']);
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}
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return implode(' ', $line);
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}
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function mapType($column)
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{
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$map = array('serial' => 'int',
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'integer' => 'int',
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'numeric' => 'decimal');
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$type = $column['type'];
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if (isset($map[$type])) {
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$type = $map[$type];
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}
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if (!empty($column['size'])) {
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$size = $column['size'];
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if ($type == 'int' &&
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in_array($size, array('tiny', 'small', 'medium', 'big'))) {
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$type = $size . $type;
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} else if (in_array($type, array('blob', 'text')) &&
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in_array($size, array('tiny', 'medium', 'long'))) {
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$type = $size . $type;
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}
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}
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return $type;
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}
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/**
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* Map a MySQL native type back to an independent type + size
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*
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* @param string $type
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* @return array ($type, $size) -- $size may be null
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*/
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protected function reverseMapType($type)
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{
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$type = strtolower($type);
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$map = array(
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'decimal' => array('numeric', null),
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'tinyint' => array('int', 'tiny'),
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'smallint' => array('int', 'small'),
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'mediumint' => array('int', 'medium'),
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'bigint' => array('int', 'big'),
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'tinyblob' => array('blob', 'tiny'),
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'mediumblob' => array('blob', 'medium'),
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'longblob' => array('blob', 'long'),
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'tinytext' => array('text', 'tiny'),
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'mediumtext' => array('text', 'medium'),
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'longtext' => array('text', 'long'),
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);
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if (isset($map[$type])) {
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return $map[$type];
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} else {
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return array($type, null);
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}
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}
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function typeAndSize($column)
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{
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if ($column['type'] == 'enum') {
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$vals = array_map(array($this, 'quote'), $column['enum']);
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return 'enum(' . implode(',', $vals) . ')';
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} else if ($this->_isString($column)) {
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return parent::typeAndSize($column) . ' CHARSET utf8';
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} else {
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return parent::typeAndSize($column);
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}
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}
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/**
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* Filter the given table definition array to match features available
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* in this database.
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*
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* This lets us strip out unsupported things like comments, foreign keys,
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* or type variants that we wouldn't get back from getTableDef().
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*
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* @param array $tableDef
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*/
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function filterDef(array $tableDef)
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{
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// @fixme add foreign-key support for MySQL
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unset($tableDef['foreign keys']);
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return $tableDef;
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}
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}
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