852 lines
23 KiB
PHP
852 lines
23 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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* @author Brion Vibber <brion@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 $_static = null;
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protected $conn = null;
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/**
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* Constructor. Only run once for singleton object.
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*/
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protected function __construct($conn = null)
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{
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if (is_null($conn)) {
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// XXX: there should be an easier way to do this.
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$user = new User();
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$conn = $user->getDatabaseConnection();
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$user->free();
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unset($user);
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}
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$this->conn = $conn;
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}
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/**
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* Main public entry point. Use this to get
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* the schema object.
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*
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* @return Schema the Schema object for the connection
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*/
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static function get($conn = null)
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{
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if (is_null($conn)) {
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$key = 'default';
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} else {
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$key = md5(serialize($conn->dsn));
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}
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$type = common_config('db', 'type');
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if (empty(self::$_static[$key])) {
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$schemaClass = ucfirst($type).'Schema';
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self::$_static[$key] = new $schemaClass($conn);
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}
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return self::$_static[$key];
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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, $columns)
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{
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$statements = $this->buildCreateTable($tableName, $def);
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return $this->runSqlSet($statements);
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}
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/**
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* Build a set of SQL statements to create a table with the given
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* name and columns.
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*
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* @param string $name Name of the table
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* @param array $def Table definition array
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*
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* @return boolean success flag
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*/
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public function buildCreateTable($name, $def)
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{
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$sql = array();
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foreach ($def['fields'] as $col => $colDef) {
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$this->appendColumnDef($sql, $col, $colDef);
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}
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// Primary and unique keys are constraints, so go within
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// the CREATE TABLE statement normally.
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if (!empty($def['primary key'])) {
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$this->appendPrimaryKeyDef($sql, $def['primary key']);
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}
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if (!empty($def['unique keys'])) {
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foreach ($def['unique keys'] as $col => $colDef) {
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$this->appendUniqueKeyDef($sql, $col, $colDef);
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}
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}
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// Multi-value indexes are advisory and for best portability
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// should be created as separate statements.
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$statements = array();
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$statements[] = $this->startCreateTable($name, $def) . "\n" .
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implode($sql, ",\n") . "\n" .
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$this->endCreateTable($name, $def);
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if (!empty($def['indexes'])) {
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foreach ($def['indexes'] as $col => $colDef) {
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$this->appendCreateIndex($statements, $name, $col, $colDef);
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}
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}
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return $statements;
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}
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/**
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* Set up a 'create table' SQL statement.
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*
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* @param string $name table name
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* @param array $def table definition
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* @param $string
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*/
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function startCreateTable($name, array $def)
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{
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return 'CREATE TABLE ' . $this->quoteIdentifier($name) . ' (';
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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 string $name table name
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* @param array $def table definition
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* @return string
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*/
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function endCreateTable($name, array $def)
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{
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return ')';
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}
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/**
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* Append an SQL fragment with a column definition in a CREATE TABLE 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 $def
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*/
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function appendColumnDef(array &$sql, $name, array $def)
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{
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$sql[] = "$name " . $this->columnSql($def);
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}
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/**
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* Append an SQL fragment with a constraint definition for a primary
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* key in a CREATE TABLE statement.
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*
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* @param array $sql
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* @param array $def
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*/
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function appendPrimaryKeyDef(array &$sql, array $def)
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{
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$sql[] = "PRIMARY KEY " . $this->buildIndexList($def);
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}
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/**
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* Append an SQL fragment with a constraint definition for a primary
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* key in a CREATE TABLE 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 $def
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*/
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function appendUniqueKeyDef(array &$sql, $name, array $def)
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{
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$sql[] = "UNIQUE $key " . $this->buildIndexList($def);
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}
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/**
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* Append an SQL statement with an index definition for an advisory
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* index over one or more columns on a table.
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*
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* @param array $statements
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* @param string $table
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* @param string $name
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* @param array $def
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*/
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function appendCreateIndex(array &$statements, $table, $name, array $def)
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{
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$statements[] = "CREATE INDEX $name ON $table " . $this->buildIndexList($def);
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}
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function buildIndexList(array $def)
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{
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// @fixme
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return '(' . implode(',', array_map(array($this, 'buildIndexItem'), $def)) . ')';
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}
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function buildIndexItem($def)
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{
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if (is_array($def)) {
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list($name, $size) = $def;
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return $this->quoteIdentifier($name) . '(' . intval($size) . ')';
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}
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return $this->quoteIdentifier($def);
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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 $def Table definition array
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*
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* @return boolean success flag
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*/
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public function ensureTable($tableName, $def)
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{
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$statements = $this->buildEnsureTable($tableName, $def);
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return $this->runSqlSet($statements);
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}
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/**
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* Run a given set of SQL commands on the connection in sequence.
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* Empty input is ok.
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*
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* @fixme if multiple statements, wrap in a transaction?
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* @param array $statements
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* @return boolean success flag
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*/
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function runSqlSet(array $statements)
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{
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$ok = true;
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foreach ($statements as $sql) {
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$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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}
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return $ok;
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}
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/**
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* Check a table's status, and if needed build a set
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* of SQL statements which change it to be consistent
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* with the given table definition.
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*
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* If the table does not yet exist, statements will
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* be returned to create the table. If it does exist,
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* statements will be returned to alter the table to
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* 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 $columns array of ColumnDef
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* objects for the table
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*
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* @return array of SQL statements
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*/
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function buildEnsureTable($tableName, $def)
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{
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try {
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$old = $this->getTableDef($tableName);
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} catch (Exception $e) {
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// @fixme this is a terrible check :D
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if (preg_match('/no such table/', $e->getMessage())) {
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return $this->buildCreateTable($tableName, $def);
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} else {
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throw $e;
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}
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}
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$cur = array_keys($old['fields']);
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$new = array_keys($def['fields']);
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$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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// Find which fields have actually changed definition
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// in a way that we need to tweak them for this DB type.
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foreach ($same as $name) {
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$curCol = $old['fields'][$name];
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$newCol = $cur['fields'][$name];
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if (!$this->columnsEqual($curCol, $newCol)) {
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$tomod[] = $name;
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}
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}
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if (count($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 $columnName) {
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$this->appendAlterAddColumn($phrase, $columnName,
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$def['fields'][$columnName]);
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}
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foreach ($todrop as $columnName) {
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$this->appendAlterModifyColumn($phrase, $columnName,
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$old['fields'][$columnName],
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$def['fields'][$columnName]);
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}
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foreach ($tomod as $columnName) {
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$this->appendAlterDropColumn($phrase, $columnName);
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}
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$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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* Append phrase(s) to an array of partial ALTER TABLE chunks in order
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* to add the given column definition to the table.
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*
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* @param array $phrase
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* @param string $columnName
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* @param array $cd
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*/
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function appendAlterAddColumn(array &$phrase, $columnName, array $cd)
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{
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$phrase[] = 'ADD COLUMN ' .
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$this->quoteIdentifier($columnName) .
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' ' .
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$this->columnSql($cd);
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}
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/**
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* Append phrase(s) to an array of partial ALTER TABLE chunks in order
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* to alter the given column from its old state to a new one.
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*
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* @param array $phrase
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* @param string $columnName
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* @param array $old previous column definition as found in DB
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* @param array $cd current column definition
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*/
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function appendAlterModifyColumn(array &$phrase, $columnName, array $old, array $cd)
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{
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$phrase[] = 'MODIFY COLUMN ' .
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$this->quoteIdentifier($columnName) .
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' ' .
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$this->columnSql($cd);
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}
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/**
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* Append phrase(s) to an array of partial ALTER TABLE chunks in order
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* to drop the given column definition from the table.
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*
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* @param array $phrase
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* @param string $columnName
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*/
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function appendAlterDropColumn(array &$phrase, $columnName)
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{
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$phrase[] = 'DROP COLUMN ' . $this->quoteIdentifier($columnName);
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}
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/**
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* Quote a db/table/column identifier if necessary.
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*
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|
* @param string $name
|
|
* @return string
|
|
*/
|
|
function quoteIdentifier($name)
|
|
{
|
|
return $name;
|
|
}
|
|
|
|
function quoteDefaultValue($cd)
|
|
{
|
|
if ($cd['type'] == 'datetime' && $cd['default'] == 'CURRENT_TIMESTAMP') {
|
|
return $cd['default'];
|
|
} else {
|
|
return $this->quoteValue($cd['default']);
|
|
}
|
|
}
|
|
|
|
function quoteValue($val)
|
|
{
|
|
if (is_int($val) || is_float($val) || is_double($val)) {
|
|
return strval($val);
|
|
} else {
|
|
return '"' . $this->conn->escapeSimple($val) . '"';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if two column definitions are equivalent.
|
|
* The default implementation checks _everything_ but in many cases
|
|
* you may be able to discard a bunch of equivalencies.
|
|
*
|
|
* @param array $a
|
|
* @param array $b
|
|
* @return boolean
|
|
*/
|
|
function columnsEqual(array $a, array $b)
|
|
{
|
|
return !array_diff_assoc($a, $b) && !array_diff_assoc($b, $a);
|
|
}
|
|
|
|
/**
|
|
* Returns the array of names from an array of
|
|
* ColumnDef objects.
|
|
*
|
|
* @param array $cds array of ColumnDef objects
|
|
*
|
|
* @return array strings for name values
|
|
*/
|
|
|
|
protected function _names($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 $name Name of the column
|
|
*
|
|
* @return ColumnDef matching item or null if no match.
|
|
*/
|
|
|
|
protected function _byName($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
|
|
*/
|
|
|
|
function columnSql(array $cd)
|
|
{
|
|
$line = array();
|
|
$line[] = $this->typeAndSize($cd);
|
|
|
|
if (isset($cd['default'])) {
|
|
$line[] = 'default';
|
|
$line[] = $this->quoteDefaultValue($cd);
|
|
} else if (!empty($cd['not null'])) {
|
|
// Can't have both not null AND default!
|
|
$line[] = 'not null';
|
|
}
|
|
|
|
return implode(' ', $line);
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param string $column canonical type name in defs
|
|
* @return string native DB type name
|
|
*/
|
|
function mapType($column)
|
|
{
|
|
return $column;
|
|
}
|
|
|
|
function typeAndSize($column)
|
|
{
|
|
$type = $this->mapType($column);
|
|
$lengths = array();
|
|
|
|
if ($column['type'] == 'numeric') {
|
|
if (isset($column['precision'])) {
|
|
$lengths[] = $column['precision'];
|
|
if (isset($column['scale'])) {
|
|
$lengths[] = $column['scale'];
|
|
}
|
|
}
|
|
} else if (isset($column['length'])) {
|
|
$lengths[] = $column['length'];
|
|
}
|
|
|
|
if ($lengths) {
|
|
return $type . '(' . implode(',', $lengths) . ')';
|
|
} else {
|
|
return $type;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Map a native type back to an independent type + size
|
|
*
|
|
* @param string $type
|
|
* @return array ($type, $size) -- $size may be null
|
|
*/
|
|
protected function reverseMapType($type)
|
|
{
|
|
return array($type, null);
|
|
}
|
|
|
|
/**
|
|
* Convert an old-style set of ColumnDef objects into the current
|
|
* Drupal-style schema definition array, for backwards compatibility
|
|
* with plugins written for 0.9.x.
|
|
*
|
|
* @param string $tableName
|
|
* @param array $defs
|
|
* @return array
|
|
*/
|
|
function oldToNew($tableName, $defs)
|
|
{
|
|
$table = array();
|
|
$prefixes = array(
|
|
'tiny',
|
|
'small',
|
|
'medium',
|
|
'big',
|
|
);
|
|
foreach ($defs as $cd) {
|
|
$cd->addToTableDef($table);
|
|
$column = array();
|
|
$column['type'] = $cd->type;
|
|
foreach ($prefixes as $prefix) {
|
|
if (substr($cd->type, 0, strlen($prefix)) == $prefix) {
|
|
$column['type'] = substr($cd->type, strlen($prefix));
|
|
$column['size'] = $prefix;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ($cd->size) {
|
|
if ($cd->type == 'varchar' || $cd->type == 'char') {
|
|
$column['length'] = $cd->size;
|
|
}
|
|
}
|
|
if (!$cd->nullable) {
|
|
$column['not null'] = true;
|
|
}
|
|
if ($cd->autoincrement) {
|
|
$column['type'] = 'serial';
|
|
}
|
|
if ($cd->default) {
|
|
$column['default'] = $cd->default;
|
|
}
|
|
$table['fields'][$cd->name] = $column;
|
|
|
|
if ($cd->key == 'PRI') {
|
|
// If multiple columns are defined as primary key,
|
|
// we'll pile them on in sequence.
|
|
if (!isset($table['primary key'])) {
|
|
$table['primary key'] = array();
|
|
}
|
|
$table['primary key'][] = $cd->name;
|
|
} else if ($cd->key == 'MUL') {
|
|
// Individual multiple-value indexes are only per-column
|
|
// using the old ColumnDef syntax.
|
|
$idx = "{$tableName}_{$cd->name}_idx";
|
|
$table['indexes'][$idx] = array($cd->name);
|
|
} else if ($cd->key == 'UNI') {
|
|
// Individual unique-value indexes are only per-column
|
|
// using the old ColumnDef syntax.
|
|
$idx = "{$tableName}_{$cd->name}_idx";
|
|
$table['unique keys'][$idx] = array($cd->name);
|
|
}
|
|
}
|
|
|
|
return $table;
|
|
}
|
|
|
|
function isNumericType($type)
|
|
{
|
|
$type = strtolower($type);
|
|
$known = array('int', 'serial', 'numeric');
|
|
return in_array($type, $known);
|
|
}
|
|
|
|
/**
|
|
* Pull info from the query into a fun-fun array of dooooom
|
|
*
|
|
* @param string $sql
|
|
* @return array of arrays
|
|
*/
|
|
protected function fetchQueryData($sql)
|
|
{
|
|
$res = $this->conn->query($sql);
|
|
if (PEAR::isError($res)) {
|
|
throw new Exception($res->getMessage());
|
|
}
|
|
|
|
$out = array();
|
|
$row = array();
|
|
while ($res->fetchInto($row, DB_FETCHMODE_ASSOC)) {
|
|
$out[] = $row;
|
|
}
|
|
$res->free();
|
|
|
|
return $out;
|
|
}
|
|
|
|
}
|
|
|
|
class SchemaTableMissingException extends Exception
|
|
{
|
|
// no-op
|
|
}
|
|
|