395 lines
12 KiB
PHP
395 lines
12 KiB
PHP
<?php
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/*
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* StatusNet - the distributed open-source microblogging tool
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* Copyright (C) 2010, StatusNet, Inc.
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*
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* 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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/**
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* Wrapper for Memcached_DataObject which knows its own schema definition.
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* Builds its own damn settings from a schema definition.
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*
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* @author Brion Vibber <brion@status.net>
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*/
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abstract class Managed_DataObject extends Memcached_DataObject
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{
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/**
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* The One True Thingy that must be defined and declared.
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*/
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public static function schemaDef()
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{
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throw new MethodNotImplementedException(__METHOD__);
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}
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/**
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* Get an instance by key
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*
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* @param string $k Key to use to lookup (usually 'id' for this class)
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* @param mixed $v Value to lookup
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*
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* @return get_called_class() object if found, or null for no hits
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*
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*/
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static function getKV($k,$v=NULL)
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{
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return parent::getClassKV(get_called_class(), $k, $v);
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}
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/**
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* Get an instance by compound key
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*
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* This is a utility method to get a single instance with a given set of
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* key-value pairs. Usually used for the primary key for a compound key; thus
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* the name.
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*
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* @param array $kv array of key-value mappings
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*
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* @return get_called_class() object if found, or null for no hits
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*
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*/
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static function pkeyGet(array $kv)
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{
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return parent::pkeyGetClass(get_called_class(), $kv);
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}
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/**
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* Get multiple items from the database by key
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*
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* @param string $keyCol name of column for key
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* @param array $keyVals key values to fetch
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* @param boolean $skipNulls return only non-null results?
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*
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* @return array Array of objects, in order
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*/
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static function multiGet($keyCol, array $keyVals, $skipNulls=true)
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{
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return parent::multiGetClass(get_called_class(), $keyCol, $keyVals, $skipNulls);
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}
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/**
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* Get multiple items from the database by key
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*
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* @param string $keyCol name of column for key
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* @param array $keyVals key values to fetch
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* @param array $otherCols Other columns to hold fixed
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*
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* @return array Array mapping $keyVals to objects, or null if not found
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*/
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static function pivotGet($keyCol, array $keyVals, array $otherCols=array())
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{
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return parent::pivotGetClass(get_called_class(), $keyCol, $keyVals, $otherCols);
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}
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/**
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* Get a multi-instance object
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*
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* This is a utility method to get multiple instances with a given set of
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* values for a specific column.
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*
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* @param string $keyCol key column name
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* @param array $keyVals array of key values
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*
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* @return get_called_class() object with multiple instances if found,
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* Exception is thrown when no entries are found.
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*
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*/
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static function listFind($keyCol, array $keyVals)
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{
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return parent::listFindClass(get_called_class(), $keyCol, $keyVals);
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}
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/**
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* Get a multi-instance object separated into an array
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*
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* This is a utility method to get multiple instances with a given set of
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* values for a specific key column. Usually used for the primary key when
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* multiple values are desired. Result is an array.
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*
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* @param string $keyCol key column name
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* @param array $keyVals array of key values
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*
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* @return array with an get_called_class() object for each $keyVals entry
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*
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*/
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static function listGet($keyCol, array $keyVals)
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{
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return parent::listGetClass(get_called_class(), $keyCol, $keyVals);
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}
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/**
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* get/set an associative array of table columns
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*
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* @access public
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* @return array (associative)
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*/
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public function table()
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{
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$table = static::schemaDef();
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return array_map(array($this, 'columnBitmap'), $table['fields']);
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}
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/**
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* get/set an array of table primary keys
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*
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* Key info is pulled from the table definition array.
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*
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* @access private
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* @return array
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*/
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function keys()
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{
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return array_keys($this->keyTypes());
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}
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/**
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* Get a sequence key
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*
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* Returns the first serial column defined in the table, if any.
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*
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* @access private
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* @return array (column,use_native,sequence_name)
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*/
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function sequenceKey()
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{
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$table = static::schemaDef();
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foreach ($table['fields'] as $name => $column) {
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if ($column['type'] == 'serial') {
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// We have a serial/autoincrement column.
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// Declare it to be a native sequence!
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return array($name, true, false);
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}
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}
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// No sequence key on this table.
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return array(false, false, false);
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}
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/**
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* Return key definitions for DB_DataObject and Memcache_DataObject.
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*
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* DB_DataObject needs to know about keys that the table has; this function
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* defines them.
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*
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* @return array key definitions
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*/
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function keyTypes()
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{
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$table = static::schemaDef();
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$keys = array();
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if (!empty($table['unique keys'])) {
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foreach ($table['unique keys'] as $idx => $fields) {
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foreach ($fields as $name) {
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$keys[$name] = 'U';
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}
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}
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}
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if (!empty($table['primary key'])) {
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foreach ($table['primary key'] as $name) {
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$keys[$name] = 'K';
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}
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}
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return $keys;
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}
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/**
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* Build the appropriate DB_DataObject bitfield map for this field.
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*
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* @param array $column
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* @return int
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*/
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function columnBitmap($column)
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{
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$type = $column['type'];
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// For quoting style...
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$intTypes = array('int',
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'integer',
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'float',
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'serial',
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'numeric');
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if (in_array($type, $intTypes)) {
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$style = DB_DATAOBJECT_INT;
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} else {
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$style = DB_DATAOBJECT_STR;
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}
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// Data type formatting style...
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$formatStyles = array('blob' => DB_DATAOBJECT_BLOB,
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'text' => DB_DATAOBJECT_TXT,
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'date' => DB_DATAOBJECT_DATE,
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'time' => DB_DATAOBJECT_TIME,
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'datetime' => DB_DATAOBJECT_DATE | DB_DATAOBJECT_TIME,
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'timestamp' => DB_DATAOBJECT_MYSQLTIMESTAMP);
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if (isset($formatStyles[$type])) {
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$style |= $formatStyles[$type];
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}
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// Nullable?
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if (!empty($column['not null'])) {
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$style |= DB_DATAOBJECT_NOTNULL;
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}
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return $style;
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}
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function links()
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{
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$links = array();
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$table = static::schemaDef();
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foreach ($table['foreign keys'] as $keyname => $keydef) {
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if (count($keydef) == 2 && is_string($keydef[0]) && is_array($keydef[1]) && count($keydef[1]) == 1) {
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if (isset($keydef[1][0])) {
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$links[$keydef[1][0]] = $keydef[0].':'.$keydef[1][1];
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}
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}
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}
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return $links;
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}
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/**
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* Return a list of all primary/unique keys / vals that will be used for
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* caching. This will understand compound unique keys, which
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* Memcached_DataObject doesn't have enough info to handle properly.
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*
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* @return array of strings
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*/
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function _allCacheKeys()
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{
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$table = static::schemaDef();
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$ckeys = array();
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if (!empty($table['unique keys'])) {
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$keyNames = $table['unique keys'];
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foreach ($keyNames as $idx => $fields) {
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$val = array();
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foreach ($fields as $name) {
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$val[$name] = self::valueString($this->$name);
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}
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$ckeys[] = self::multicacheKey($this->tableName(), $val);
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}
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}
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if (!empty($table['primary key'])) {
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$fields = $table['primary key'];
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$val = array();
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foreach ($fields as $name) {
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$val[$name] = self::valueString($this->$name);
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}
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$ckeys[] = self::multicacheKey($this->tableName(), $val);
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}
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return $ckeys;
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}
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/**
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* Returns an ID, checked that it is set and reasonably valid
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*
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* If this dataobject uses a special id field (not 'id'), just
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* implement your ID getting method in the child class.
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*
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* @return int ID of dataobject
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* @throws Exception (when ID is not available or not set yet)
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*/
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public function getID()
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{
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// FIXME: Make these exceptions more specific (their own classes)
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if (!isset($this->id)) {
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throw new Exception('No ID set.');
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} elseif (empty($this->id)) {
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throw new Exception('Empty ID for object! (not inserted yet?).');
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}
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// FIXME: How about forcing to return an int? Or will that overflow eventually?
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return $this->id;
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}
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// 'update' won't write key columns, so we have to do it ourselves.
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// This also automatically calls "update" _before_ it sets the keys.
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// FIXME: This only works with single-column primary keys so far! Beware!
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/**
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* @param DB_DataObject &$orig Must be "instanceof" $this
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* @param string $pid Primary ID column (no escaping is done on column name!)
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*/
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public function updateWithKeys(&$orig, $pid='id')
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{
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if (!$orig instanceof $this) {
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throw new ServerException('Tried updating a DataObject with a different class than itself.');
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}
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// do it in a transaction
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$this->query('BEGIN');
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$parts = array();
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foreach ($this->keys() as $k) {
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if (strcmp($this->$k, $orig->$k) != 0) {
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$parts[] = $k . ' = ' . $this->_quote($this->$k);
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}
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}
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if (count($parts) == 0) {
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// No changes to keys, it's safe to run ->update(...)
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if ($this->update($orig) === false) {
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common_log_db_error($this, 'UPDATE', __FILE__);
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// rollback as something bad occurred
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$this->query('ROLLBACK');
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throw new ServerException("Could not UPDATE non-keys for {$this->__table}");
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}
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$orig->decache();
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$this->encache();
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// commit our db transaction since we won't reach the COMMIT below
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$this->query('COMMIT');
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// @FIXME return true only if something changed (otherwise 0)
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return true;
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}
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$qry = sprintf('UPDATE %1$s SET %2$s WHERE %3$s = %4$s',
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common_database_tablename($this->tableName()),
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implode(', ', $parts),
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$pid,
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$this->_quote($this->$pid));
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$result = $this->query($qry);
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if ($result === false) {
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common_log_db_error($this, 'UPDATE', __FILE__);
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// rollback as something bad occurred
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$this->query('ROLLBACK');
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throw new ServerException("Could not UPDATE key fields for {$this->__table}");
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}
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// Update non-keys too, if the previous endeavour worked.
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// The ->update call uses "$this" values for keys, that's why we can't do this until
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// the keys are updated (because they might differ from $orig and update the wrong entries).
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if ($this->update($orig) === false) {
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common_log_db_error($this, 'UPDATE', __FILE__);
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// rollback as something bad occurred
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$this->query('ROLLBACK');
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throw new ServerException("Could not UPDATE non-keys for {$this->__table}");
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}
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$orig->decache();
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$this->encache();
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// commit our db transaction
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$this->query('COMMIT');
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// @FIXME return true only if something changed (otherwise 0)
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return $result;
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}
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}
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