699 lines
19 KiB
PHP
699 lines
19 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 $conn = null;
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/**
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* Constructor. Only run once for singleton object.
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*/
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protected function __construct()
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{
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// XXX: there should be an easier way to do this.
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$user = new User();
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$this->conn = $user->getDatabaseConnection();
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$user->free();
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unset($user);
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}
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/**
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* Main public entry point. Use this to get
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* the singleton object.
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*
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* @return Schema the (single) Schema object
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*/
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static function get()
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{
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if (empty(self::$_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 $name Name of the table to get
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*
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* @return TableDef tabledef for that table.
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* @throws SchemaTableMissingException
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*/
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public function getTableDef($name)
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{
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$query = "SELECT * FROM INFORMATION_SCHEMA.COLUMNS " .
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"WHERE TABLE_SCHEMA='%s' AND TABLE_NAME='%s'";
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$schema = $this->conn->dsn['database'];
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$sql = sprintf($query, $schema, $name);
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$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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if ($res->numRows() == 0) {
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$res->free();
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throw new SchemaTableMissingException("No such table: $name");
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}
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$td = new TableDef();
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$td->name = $name;
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$td->columns = array();
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$row = array();
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while ($res->fetchInto($row, DB_FETCHMODE_ASSOC)) {
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$cd = new ColumnDef();
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$cd->name = $row['COLUMN_NAME'];
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$packed = $row['COLUMN_TYPE'];
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if (preg_match('/^(\w+)\((\d+)\)$/', $packed, $match)) {
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$cd->type = $match[1];
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$cd->size = $match[2];
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} else {
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$cd->type = $packed;
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}
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$cd->nullable = ($row['IS_NULLABLE'] == 'YES') ? true : false;
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$cd->key = $row['COLUMN_KEY'];
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$cd->default = $row['COLUMN_DEFAULT'];
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$cd->extra = $row['EXTRA'];
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// Autoincrement is stuck into the extra column.
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// Pull it out so we don't accidentally mod it every time...
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$extra = preg_replace('/(^|\s)auto_increment(\s|$)/i', '$1$2', $cd->extra);
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if ($extra != $cd->extra) {
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$cd->extra = trim($extra);
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$cd->auto_increment = true;
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}
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// mysql extensions -- not (yet) used by base class
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$cd->charset = $row['CHARACTER_SET_NAME'];
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$cd->collate = $row['COLLATION_NAME'];
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$td->columns[] = $cd;
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}
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$res->free();
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return $td;
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}
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/**
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* Pull the given table properties from INFORMATION_SCHEMA.
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* Most of the good stuff is MySQL extensions.
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*
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* @return array
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* @throws Exception if table info can't be looked up
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*/
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function getTableProperties($table, $props)
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{
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$query = "SELECT %s FROM INFORMATION_SCHEMA.TABLES " .
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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, implode(',', $props), $schema, $table);
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$res = $this->conn->query($sql);
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$row = array();
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$ok = $res->fetchInto($row, DB_FETCHMODE_ASSOC);
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$res->free();
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if ($ok) {
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return $row;
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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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* Gets a ColumnDef object for a single column.
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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
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* @param string $column name of the column
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*
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* @return ColumnDef definition of the column or null
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* if not found.
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*/
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public function getColumnDef($table, $column)
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{
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$td = $this->getTableDef($table);
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foreach ($td->columns as $cd) {
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if ($cd->name == $column) {
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return $cd;
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}
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}
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return null;
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}
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/**
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* Creates a table with the given names and columns.
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*
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* @param string $name Name of the table
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* @param array $columns Array of ColumnDef objects
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* for new table.
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*
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* @return boolean success flag
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*/
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public function createTable($name, $columns)
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{
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$uniques = array();
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$primary = array();
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$indices = array();
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$sql = "CREATE TABLE $name (\n";
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for ($i = 0; $i < count($columns); $i++) {
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$cd =& $columns[$i];
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if ($i > 0) {
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$sql .= ",\n";
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}
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$sql .= $this->_columnSql($cd);
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}
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$idx = $this->_indexList($columns);
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if ($idx['primary']) {
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$sql .= ",\nconstraint primary key (" . implode(',', $idx['primary']) . ")";
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}
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foreach ($idx['uniques'] as $u) {
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$key = $this->_uniqueKey($name, $u);
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$sql .= ",\nunique index $key ($u)";
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}
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foreach ($idx['indices'] as $i) {
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$key = $this->_key($name, $i);
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$sql .= ",\nindex $key ($i)";
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}
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$sql .= ") ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin; ";
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$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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* Look over a list of column definitions and list up which
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* indices will be present
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*/
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private function _indexList(array $columns)
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{
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$list = array('uniques' => array(),
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'primary' => array(),
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'indices' => array());
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foreach ($columns as $cd) {
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switch ($cd->key) {
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case 'UNI':
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$list['uniques'][] = $cd->name;
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break;
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case 'PRI':
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$list['primary'][] = $cd->name;
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break;
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case 'MUL':
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$list['indices'][] = $cd->name;
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break;
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}
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}
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return $list;
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}
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/**
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* Get the unique index key name for a given column on this table
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*/
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function _uniqueKey($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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* Drops a table from the schema
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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 $name Name of the table to drop
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*
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* @return boolean success flag
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*/
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public function dropTable($name)
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{
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$res = $this->conn->query("DROP TABLE $name");
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if (PEAR::isError($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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* Adds an index to a table.
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*
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* If no name is provided, a name will be made up based
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* on the table name and column names.
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*
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* Throws an exception on database error, esp. if the table
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* does not exist.
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*
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* @param string $table Name of the table
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* @param array $columnNames Name of columns to index
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* @param string $name (Optional) name of the index
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*
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* @return boolean success flag
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*/
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public function createIndex($table, $columnNames, $name=null)
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{
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if (!is_array($columnNames)) {
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$columnNames = array($columnNames);
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}
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if (empty($name)) {
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$name = "$table_".implode("_", $columnNames)."_idx";
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}
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$res = $this->conn->query("ALTER TABLE $table ".
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"ADD INDEX $name (".
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implode(",", $columnNames).")");
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if (PEAR::isError($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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* Drops a named index from a table.
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*
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* @param string $table name of the table the index is on.
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* @param string $name name of the index
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*
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* @return boolean success flag
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*/
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public function dropIndex($table, $name)
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{
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$res = $this->conn->query("ALTER TABLE $table DROP INDEX $name");
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if (PEAR::isError($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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* Adds a column to a table
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*
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* @param string $table name of the table
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* @param ColumnDef $columndef Definition of the new
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* column.
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*
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* @return boolean success flag
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*/
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public function addColumn($table, $columndef)
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{
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$sql = "ALTER TABLE $table ADD COLUMN " . $this->_columnSql($columndef);
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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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* Modifies a column in the schema.
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*
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* The name must match an existing column and table.
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*
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* @param string $table name of the table
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* @param ColumnDef $columndef new definition of the column.
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*
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* @return boolean success flag
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*/
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public function modifyColumn($table, $columndef)
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{
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$sql = "ALTER TABLE $table MODIFY COLUMN " .
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$this->_columnSql($columndef);
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$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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* Drops a column from a table
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*
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* The name must match an existing column.
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*
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* @param string $table name of the table
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* @param string $columnName name of the column to drop
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*
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* @return boolean success flag
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*/
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public function dropColumn($table, $columnName)
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{
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$sql = "ALTER TABLE $table DROP COLUMN $columnName";
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$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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* 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);
|
|
|
|
$phrase[] = 'MODIFY COLUMN ' . $this->_columnSql($cd);
|
|
}
|
|
|
|
foreach ($addIndex as $indexSql) {
|
|
$phrase[] = $indexSql;
|
|
}
|
|
|
|
foreach ($tableProps as $key => $val) {
|
|
$phrase[] = "$key=$val";
|
|
}
|
|
|
|
$sql = 'ALTER TABLE ' . $tableName . ' ' . implode(', ', $phrase);
|
|
|
|
common_log(LOG_DEBUG, __METHOD__ . ': ' . $sql);
|
|
$res = $this->conn->query($sql);
|
|
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns the array of names from an array of
|
|
* ColumnDef objects.
|
|
*
|
|
* @param array $cds array of ColumnDef objects
|
|
*
|
|
* @return array strings for name values
|
|
*/
|
|
|
|
private function _names($cds)
|
|
{
|
|
$names = array();
|
|
|
|
foreach ($cds as $cd) {
|
|
$names[] = $cd->name;
|
|
}
|
|
|
|
return $names;
|
|
}
|
|
|
|
/**
|
|
* Get a ColumnDef from an array matching
|
|
* name.
|
|
*
|
|
* @param array $cds Array of ColumnDef objects
|
|
* @param string $name Name of the column
|
|
*
|
|
* @return ColumnDef matching item or null if no match.
|
|
*/
|
|
|
|
private function _byName($cds, $name)
|
|
{
|
|
foreach ($cds as $cd) {
|
|
if ($cd->name == $name) {
|
|
return $cd;
|
|
}
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Return the proper SQL for creating or
|
|
* altering a column.
|
|
*
|
|
* Appropriate for use in CREATE TABLE or
|
|
* ALTER TABLE statements.
|
|
*
|
|
* @param ColumnDef $cd column to create
|
|
*
|
|
* @return string correct SQL for that column
|
|
*/
|
|
|
|
private function _columnSql($cd)
|
|
{
|
|
$sql = "{$cd->name} ";
|
|
|
|
if (!empty($cd->size)) {
|
|
$sql .= "{$cd->type}({$cd->size}) ";
|
|
} else {
|
|
$sql .= "{$cd->type} ";
|
|
}
|
|
|
|
if ($this->_isString($cd)) {
|
|
$sql .= " CHARACTER SET utf8 ";
|
|
}
|
|
|
|
if (!empty($cd->default)) {
|
|
$sql .= "default {$cd->default} ";
|
|
} else {
|
|
$sql .= ($cd->nullable) ? "null " : "not null ";
|
|
}
|
|
|
|
if (!empty($cd->auto_increment)) {
|
|
$sql .= " auto_increment ";
|
|
}
|
|
|
|
if (!empty($cd->extra)) {
|
|
$sql .= "{$cd->extra} ";
|
|
}
|
|
|
|
return $sql;
|
|
}
|
|
|
|
/**
|
|
* Is this column a string type?
|
|
*/
|
|
private function _isString(ColumnDef $cd)
|
|
{
|
|
$strings = array('char', 'varchar', 'text');
|
|
return in_array(strtolower($cd->type), $strings);
|
|
}
|
|
}
|