forked from GNUsocial/gnu-social
409 lines
12 KiB
PHP
409 lines
12 KiB
PHP
<?php
|
|
/**
|
|
* StatusNet, the distributed open-source microblogging tool
|
|
*
|
|
* Database schema utilities
|
|
*
|
|
* PHP version 5
|
|
*
|
|
* LICENCE: This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Affero General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Affero General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* @category Database
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @copyright 2009 StatusNet, Inc.
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
|
|
if (!defined('STATUSNET')) {
|
|
exit(1);
|
|
}
|
|
|
|
/**
|
|
* Class representing the database schema
|
|
*
|
|
* A class representing the database schema. Can be used to
|
|
* manipulate the schema -- especially for plugins and upgrade
|
|
* utilities.
|
|
*
|
|
* @category Database
|
|
* @package StatusNet
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
|
|
* @link http://status.net/
|
|
*/
|
|
|
|
class MysqlSchema extends Schema
|
|
{
|
|
static $_single = null;
|
|
protected $conn = null;
|
|
|
|
|
|
/**
|
|
* Main public entry point. Use this to get
|
|
* the singleton object.
|
|
*
|
|
* @return Schema the (single) Schema object
|
|
*/
|
|
|
|
static function get()
|
|
{
|
|
if (empty(self::$_single)) {
|
|
self::$_single = new Schema();
|
|
}
|
|
return self::$_single;
|
|
}
|
|
|
|
/**
|
|
* Returns a TableDef object for the table
|
|
* in the schema with the given name.
|
|
*
|
|
* Throws an exception if the table is not found.
|
|
*
|
|
* @param string $table Name of the table to get
|
|
*
|
|
* @return TableDef tabledef for that table.
|
|
* @throws SchemaTableMissingException
|
|
*/
|
|
|
|
public function getTableDef($table)
|
|
{
|
|
$def = array();
|
|
$hasKeys = false;
|
|
|
|
// Pull column data from INFORMATION_SCHEMA
|
|
$columns = $this->fetchMetaInfo($table, 'COLUMNS', 'ORDINAL_POSITION');
|
|
if (count($columns) == 0) {
|
|
throw new SchemaTableMissingException("No such table: $table");
|
|
}
|
|
|
|
foreach ($columns as $row) {
|
|
|
|
$name = $row['COLUMN_NAME'];
|
|
$field = array();
|
|
|
|
// warning -- 'unsigned' attr on numbers isn't given in DATA_TYPE and friends.
|
|
// It is stuck in on COLUMN_TYPE though (eg 'bigint(20) unsigned')
|
|
$field['type'] = $type = $row['DATA_TYPE'];
|
|
|
|
if ($type == 'char' || $type == 'varchar') {
|
|
if ($row['CHARACTER_MAXIMUM_LENGTH'] !== null) {
|
|
$field['length'] = intval($row['CHARACTER_MAXIMUM_LENGTH']);
|
|
}
|
|
}
|
|
if ($type == 'decimal') {
|
|
// Other int types may report these values, but they're irrelevant.
|
|
// Just ignore them!
|
|
if ($row['NUMERIC_PRECISION'] !== null) {
|
|
$field['precision'] = intval($row['NUMERIC_PRECISION']);
|
|
}
|
|
if ($row['NUMERIC_SCALE'] !== null) {
|
|
$field['scale'] = intval($row['NUMERIC_SCALE']);
|
|
}
|
|
}
|
|
if ($row['IS_NULLABLE'] == 'NO') {
|
|
$field['not null'] = true;
|
|
}
|
|
if ($row['COLUMN_DEFAULT'] !== null) {
|
|
$field['default'] = $row['COLUMN_DEFAULT'];
|
|
if ($this->isNumericType($type)) {
|
|
$field['default'] = intval($field['default']);
|
|
}
|
|
}
|
|
if ($row['COLUMN_KEY'] !== null) {
|
|
// We'll need to look up key info...
|
|
$hasKeys = true;
|
|
}
|
|
if ($row['COLUMN_COMMENT'] !== null && $row['COLUMN_COMMENT'] != '') {
|
|
$field['description'] = $row['COLUMN_COMMENT'];
|
|
}
|
|
|
|
$extra = $row['EXTRA'];
|
|
if ($extra) {
|
|
if (preg_match('/(^|\s)auto_increment(\s|$)/i', $extra)) {
|
|
$field['auto_increment'] = true;
|
|
}
|
|
// $row['EXTRA'] may contain 'on update CURRENT_TIMESTAMP'
|
|
// ^ ...... how to specify?
|
|
}
|
|
|
|
if ($row['CHARACTER_SET_NAME'] !== null) {
|
|
// @fixme check against defaults?
|
|
//$def['charset'] = $row['CHARACTER_SET_NAME'];
|
|
//$def['collate'] = $row['COLLATION_NAME'];
|
|
}
|
|
|
|
$def['fields'][$name] = $field;
|
|
}
|
|
|
|
if ($hasKeys) {
|
|
// INFORMATION_SCHEMA's CONSTRAINTS and KEY_COLUMN_USAGE tables give
|
|
// good info on primary and unique keys but don't list ANY info on
|
|
// multi-value keys, which is lame-o. Sigh.
|
|
//
|
|
// Let's go old school and use SHOW INDEX :D
|
|
//
|
|
$keyInfo = $this->fetchIndexInfo($table);
|
|
$keys = array();
|
|
foreach ($keyInfo as $row) {
|
|
$name = $row['Key_name'];
|
|
$column = $row['Column_name'];
|
|
|
|
if (!isset($keys[$name])) {
|
|
$keys[$name] = array();
|
|
}
|
|
$keys[$name][] = $column;
|
|
|
|
if ($name == 'PRIMARY') {
|
|
$type = 'primary key';
|
|
} else if ($row['Non_unique'] == 0) {
|
|
$type = 'unique keys';
|
|
} else if ($row['Index_type'] == 'FULLTEXT') {
|
|
$type = 'fulltext indexes';
|
|
} else {
|
|
$type = 'indexes';
|
|
}
|
|
$keyTypes[$name] = $type;
|
|
}
|
|
|
|
foreach ($keyTypes as $name => $type) {
|
|
if ($type == 'primary key') {
|
|
// there can be only one
|
|
$def[$type] = $keys[$name];
|
|
} else {
|
|
$def[$type][$name] = $keys[$name];
|
|
}
|
|
}
|
|
}
|
|
return $def;
|
|
}
|
|
|
|
/**
|
|
* Pull the given table properties from INFORMATION_SCHEMA.
|
|
* Most of the good stuff is MySQL extensions.
|
|
*
|
|
* @return array
|
|
* @throws Exception if table info can't be looked up
|
|
*/
|
|
|
|
function getTableProperties($table, $props)
|
|
{
|
|
$data = $this->fetchMetaInfo($table, 'TABLES');
|
|
if ($data) {
|
|
return $data[0];
|
|
} else {
|
|
throw new SchemaTableMissingException("No such table: $table");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Pull some INFORMATION.SCHEMA data for the given table.
|
|
*
|
|
* @param string $table
|
|
* @return array of arrays
|
|
*/
|
|
function fetchMetaInfo($table, $infoTable, $orderBy=null)
|
|
{
|
|
$query = "SELECT * FROM INFORMATION_SCHEMA.%s " .
|
|
"WHERE TABLE_SCHEMA='%s' AND TABLE_NAME='%s'";
|
|
$schema = $this->conn->dsn['database'];
|
|
$sql = sprintf($query, $infoTable, $schema, $table);
|
|
if ($orderBy) {
|
|
$sql .= ' ORDER BY ' . $orderBy;
|
|
}
|
|
return $this->fetchQueryData($sql);
|
|
}
|
|
|
|
/**
|
|
* Pull 'SHOW INDEX' data for the given table.
|
|
*
|
|
* @param string $table
|
|
* @return array of arrays
|
|
*/
|
|
function fetchIndexInfo($table)
|
|
{
|
|
$query = "SHOW INDEX FROM `%s`";
|
|
$sql = sprintf($query, $table);
|
|
return $this->fetchQueryData($sql);
|
|
}
|
|
|
|
/**
|
|
* Close out a 'create table' SQL statement.
|
|
*
|
|
* @param string $name
|
|
* @param array $def
|
|
* @return string;
|
|
*
|
|
* @fixme ENGINE may need to be set differently in some cases,
|
|
* such as to support fulltext index.
|
|
*/
|
|
function endCreateTable($name, array $def)
|
|
{
|
|
return ") ENGINE=InnoDB CHARACTER SET utf8 COLLATE utf8_bin";
|
|
}
|
|
|
|
/**
|
|
* Get the unique index key name for a given column on this table
|
|
*/
|
|
function _uniqueKey($tableName, $columnName)
|
|
{
|
|
return $this->_key($tableName, $columnName);
|
|
}
|
|
|
|
/**
|
|
* Get the index key name for a given column on this table
|
|
*/
|
|
function _key($tableName, $columnName)
|
|
{
|
|
return "{$tableName}_{$columnName}_idx";
|
|
}
|
|
|
|
|
|
/**
|
|
* MySQL doesn't take 'DROP CONSTRAINT', need to treat unique keys as
|
|
* if they were indexes here.
|
|
*
|
|
* @param array $phrase
|
|
* @param <type> $keyName MySQL
|
|
*/
|
|
function appendAlterDropUnique(array &$phrase, $keyName)
|
|
{
|
|
$phrase[] = 'DROP INDEX ' . $keyName;
|
|
}
|
|
|
|
/**
|
|
* Throw some table metadata onto the ALTER TABLE if we have a mismatch
|
|
* in expected type, collation.
|
|
*/
|
|
function appendAlterExtras(array &$phrase, $tableName)
|
|
{
|
|
// Check for table properties: make sure we're using a sane
|
|
// engine type and charset/collation.
|
|
// @fixme make the default engine configurable?
|
|
$oldProps = $this->getTableProperties($tableName, array('ENGINE', 'TABLE_COLLATION'));
|
|
if (strtolower($oldProps['ENGINE']) != 'innodb') {
|
|
$phrase[] = 'ENGINE=InnoDB';
|
|
}
|
|
if (strtolower($oldProps['TABLE_COLLATION']) != 'utf8_bin') {
|
|
$phrase[] = 'DEFAULT CHARSET=utf8';
|
|
$phrase[] = 'COLLATE=utf8_bin';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Is this column a string type?
|
|
*/
|
|
private function _isString(array $cd)
|
|
{
|
|
$strings = array('char', 'varchar', 'text');
|
|
return in_array(strtolower($cd['type']), $strings);
|
|
}
|
|
|
|
/**
|
|
* 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();
|
|
$line[] = parent::columnSql($cd);
|
|
|
|
// This'll have been added from our transform of 'serial' type
|
|
if (!empty($cd['auto_increment'])) {
|
|
$line[] = 'auto_increment';
|
|
}
|
|
|
|
if (!empty($cd['description'])) {
|
|
$line[] = 'comment';
|
|
$line[] = $this->quoteValue($cd['description']);
|
|
}
|
|
|
|
return implode(' ', $line);
|
|
}
|
|
|
|
function mapType($column)
|
|
{
|
|
$map = array('serial' => 'int',
|
|
'integer' => 'int',
|
|
'numeric' => 'decimal');
|
|
|
|
$type = $column['type'];
|
|
if (isset($map[$type])) {
|
|
$type = $map[$type];
|
|
}
|
|
|
|
if (!empty($column['size'])) {
|
|
$size = $column['size'];
|
|
if ($type == 'int' &&
|
|
in_array($size, array('tiny', 'small', 'medium', 'big'))) {
|
|
$type = $size . $type;
|
|
} else if (in_array($type, array('blob', 'text')) &&
|
|
in_array($size, array('tiny', 'medium', 'long'))) {
|
|
$type = $size . $type;
|
|
}
|
|
}
|
|
|
|
return $type;
|
|
}
|
|
|
|
function typeAndSize($column)
|
|
{
|
|
if ($column['type'] == 'enum') {
|
|
$vals = array_map(array($this, 'quote'), $column['enum']);
|
|
return 'enum(' . implode(',', $vals) . ')';
|
|
} else if ($this->_isString($column)) {
|
|
return parent::typeAndSize($column) . ' CHARSET utf8';
|
|
} else {
|
|
return parent::typeAndSize($column);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Filter the given table definition array to match features available
|
|
* in this database.
|
|
*
|
|
* This lets us strip out unsupported things like comments, foreign keys,
|
|
* or type variants that we wouldn't get back from getTableDef().
|
|
*
|
|
* @param array $tableDef
|
|
*/
|
|
function filterDef(array $tableDef)
|
|
{
|
|
foreach ($tableDef['fields'] as $name => &$col) {
|
|
if ($col['type'] == 'serial') {
|
|
$col['type'] = 'int';
|
|
$col['auto_increment'] = true;
|
|
}
|
|
if ($col['type'] == 'datetime' && isset($col['default']) && $col['default'] == 'CURRENT_TIMESTAMP') {
|
|
$col['type'] = 'timestamp';
|
|
}
|
|
$col['type'] = $this->mapType($col);
|
|
unset($col['size']);
|
|
}
|
|
if (!common_config('db', 'mysql_foreign_keys')) {
|
|
unset($tableDef['foreign keys']);
|
|
}
|
|
return $tableDef;
|
|
}
|
|
}
|