530 lines
13 KiB
PHP
530 lines
13 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 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 $name Name of the table to get
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*
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* @return TableDef tabledef for that table.
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*/
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public function getTableDef($name)
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{
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$res = $this->conn->query('DESCRIBE ' . $name);
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if (PEAR::isError($res)) {
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throw new Exception($res->getMessage());
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}
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$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 = $row['Field'];
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$packed = $row['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 = ($row['Null'] == 'YES') ? true : false;
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$cd->key = $row['Key'];
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$cd->default = $row['Default'];
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$cd->extra = $row['Extra'];
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$td->columns[] = $cd;
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}
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return $td;
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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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switch ($cd->key) {
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case 'UNI':
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$uniques[] = $cd->name;
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break;
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case 'PRI':
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$primary[] = $cd->name;
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break;
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case 'MUL':
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$indices[] = $cd->name;
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break;
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}
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}
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if (count($primary) > 0) { // it really should be...
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$sql .= ",\nconstraint primary key (" . implode(',', $primary) . ")";
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}
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foreach ($uniques as $u) {
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$sql .= ",\nunique index {$name}_{$u}_idx ($u)";
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}
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foreach ($indices as $i) {
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$sql .= ",\nindex {$name}_{$i}_idx ($i)";
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}
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$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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* 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 (Exception $e) {
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if (preg_match('/no such table/', $e->getMessage())) {
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return $this->createTable($tableName, $columns);
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} else {
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throw $e;
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}
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}
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$cur = $this->_names($td->columns);
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$new = $this->_names($columns);
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$toadd = array_diff($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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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[] = $newCol->name;
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}
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}
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if (count($toadd) + count($todrop) + count($tomod) == 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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$phrase = array();
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foreach ($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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$sql = 'ALTER TABLE ' . $tableName . ' ' . implode(', ', $phrase);
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$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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* Returns the array of names from an array of
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* ColumnDef objects.
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*
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* @param array $cds array of ColumnDef objects
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*
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* @return array strings for name values
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*/
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private function _names($cds)
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{
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$names = array();
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foreach ($cds as $cd) {
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$names[] = $cd->name;
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}
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return $names;
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}
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/**
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* Get a ColumnDef from an array matching
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* name.
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*
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* @param array $cds Array of ColumnDef objects
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* @param string $name Name of the column
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*
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* @return ColumnDef matching item or null if no match.
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*/
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private function _byName($cds, $name)
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{
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foreach ($cds as $cd) {
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if ($cd->name == $name) {
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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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* 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 $cd column to create
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*
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* @return string correct SQL for that column
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*/
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private function _columnSql($cd)
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{
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$sql = "{$cd->name} ";
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if (!empty($cd->size)) {
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$sql .= "{$cd->type}({$cd->size}) ";
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} else {
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$sql .= "{$cd->type} ";
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}
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if (!empty($cd->default)) {
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$sql .= "default {$cd->default} ";
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} else {
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$sql .= ($cd->nullable) ? "null " : "not null ";
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}
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return $sql;
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}
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}
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