caac2cea44
On PostgreSQL:
- Parse defaults for strings and booleans properly.
- Parse the "serial" definition type properly.
- Get information on the "enum" definition type.
- Re-work getting information about keys/indices.
On MariaDB:
- Get information about lengths in indices.
- Get foreign key information separately from the rest as they can have
colliding names.
618 lines
20 KiB
PHP
618 lines
20 KiB
PHP
<?php
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social 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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// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Database schema for MariaDB
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*
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* @category Database
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* @package GNUsocial
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* @author Evan Prodromou <evan@status.net>
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* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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defined('GNUSOCIAL') || die();
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/**
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* Class representing the database schema for MariaDB
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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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* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class MysqlSchema extends Schema
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{
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public static $_single = null;
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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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* @param object|null $conn
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* @param string|null dummy param
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* @return Schema the (single) Schema object
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*/
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public static function get($conn = null, $_ = 'mysql')
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{
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if (empty(self::$_single)) {
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self::$_single = new Schema($conn, 'mysql');
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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 $table Name of the table to get
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*
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* @return array of tabledef for that table.
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* @throws PEAR_Exception
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* @throws SchemaTableMissingException
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*/
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public function getTableDef($table)
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{
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$def = [];
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$hasKeys = false;
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// Pull column data from INFORMATION_SCHEMA
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$columns = $this->fetchMetaInfo($table, 'COLUMNS', 'ORDINAL_POSITION');
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if (count($columns) == 0) {
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throw new SchemaTableMissingException("No such table: $table");
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}
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foreach ($columns as $row) {
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$name = $row['COLUMN_NAME'];
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$field = [];
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$type = $field['type'] = $row['DATA_TYPE'];
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switch ($type) {
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case 'char':
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case 'varchar':
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if (!is_null($row['CHARACTER_MAXIMUM_LENGTH'])) {
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$field['length'] = (int) $row['CHARACTER_MAXIMUM_LENGTH'];
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}
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break;
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case 'decimal':
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// Other int types may report these values, but they're irrelevant.
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// Just ignore them!
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if (!is_null($row['NUMERIC_PRECISION'])) {
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$field['precision'] = (int) $row['NUMERIC_PRECISION'];
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}
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if (!is_null($row['NUMERIC_SCALE'])) {
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$field['scale'] = (int) $row['NUMERIC_SCALE'];
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}
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break;
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case 'enum':
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$enum = preg_replace("/^enum\('(.+)'\)$/", '\1', $row['COLUMN_TYPE']);
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$field['enum'] = explode("','", $enum);
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break;
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}
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if ($row['IS_NULLABLE'] == 'NO') {
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$field['not null'] = true;
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}
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$col_default = $row['COLUMN_DEFAULT'];
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if (!is_null($col_default) && $col_default !== 'NULL') {
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if ($this->isNumericType($field)) {
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$field['default'] = (int) $col_default;
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} elseif ($col_default === 'CURRENT_TIMESTAMP'
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|| $col_default === 'current_timestamp()') {
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// A hack for "datetime" fields
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// Skip "timestamp" as they get a CURRENT_TIMESTAMP default implicitly
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if ($type !== 'timestamp') {
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$field['default'] = 'CURRENT_TIMESTAMP';
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}
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} else {
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$match = "/^'(.*)'$/";
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if (preg_match($match, $col_default)) {
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$field['default'] = preg_replace($match, '\1', $col_default);
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} else {
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$field['default'] = $col_default;
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}
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}
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}
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if ($row['COLUMN_KEY'] !== null) {
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// We'll need to look up key info...
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$hasKeys = true;
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}
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if ($row['COLUMN_COMMENT'] !== null && $row['COLUMN_COMMENT'] != '') {
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$field['description'] = $row['COLUMN_COMMENT'];
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}
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$extra = $row['EXTRA'];
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if ($extra) {
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if (preg_match('/(^|\s)auto_increment(\s|$)/i', $extra)) {
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$field['auto_increment'] = true;
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}
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}
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$table_props = $this->getTableProperties($table, ['TABLE_COLLATION']);
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$collate = $row['COLLATION_NAME'];
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if (!empty($collate) && $collate !== $table_props['TABLE_COLLATION']) {
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$field['collate'] = $collate;
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}
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$def['fields'][$name] = $field;
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}
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if ($hasKeys) {
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$key_info = $this->fetchKeyInfo($table);
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foreach ($key_info as $row) {
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$key_name = $row['key_name'];
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$cols = $row['cols'];
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switch ($row['key_type']) {
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case 'PRIMARY':
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$def['primary key'] = $cols;
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break;
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case 'UNIQUE':
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$def['unique keys'][$key_name] = $cols;
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break;
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case 'FULLTEXT':
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$def['fulltext indexes'][$key_name] = $cols;
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break;
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default:
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$def['indexes'][$key_name] = $cols;
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}
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}
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}
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$foreign_key_info = $this->fetchForeignKeyInfo($table);
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foreach ($foreign_key_info as $row) {
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$key_name = $row['key_name'];
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$cols = $row['cols'];
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$ref_table = $row['ref_table'];
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$def['foreign keys'][$key_name] = [$ref_table, $cols];
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}
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return $def;
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}
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/**
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* Pull the given table properties from INFORMATION_SCHEMA.
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* Most of the good stuff is MySQL extensions.
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*
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* @param $table
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* @param $props
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* @return array
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* @throws PEAR_Exception
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* @throws SchemaTableMissingException
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*/
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public function getTableProperties($table, $props)
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{
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$data = $this->fetchMetaInfo($table, 'TABLES');
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if ($data) {
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return $data[0];
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} else {
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throw new SchemaTableMissingException("No such table: $table");
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}
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}
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/**
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* Pull some INFORMATION.SCHEMA data for the given table.
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*
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* @param string $table
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* @param $infoTable
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* @param null $orderBy
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* @return array of arrays
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* @throws PEAR_Exception
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*/
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public function fetchMetaInfo($table, $infoTable, $orderBy = null)
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{
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$schema = $this->conn->dsn['database'];
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return $this->fetchQueryData(sprintf(
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<<<'END'
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SELECT * FROM INFORMATION_SCHEMA.%1$s
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WHERE TABLE_SCHEMA = '%2$s' AND TABLE_NAME = '%3$s'%4$s;
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END,
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$this->quoteIdentifier($infoTable),
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$schema,
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$table,
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($orderBy ? " ORDER BY {$orderBy}" : '')
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));
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}
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/**
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* Pull index and keys information for the given table.
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*
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* @param string $table
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* @return array of arrays
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* @throws PEAR_Exception
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*/
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private function fetchKeyInfo(string $table): array
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{
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$schema = $this->conn->dsn['database'];
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$data = $this->fetchQueryData(
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<<<EOT
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SELECT INDEX_NAME AS `key_name`,
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CASE
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WHEN INDEX_NAME = 'PRIMARY' THEN 'PRIMARY'
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WHEN NON_UNIQUE IS NOT TRUE THEN 'UNIQUE'
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ELSE INDEX_TYPE
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END AS `key_type`,
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COLUMN_NAME AS `col`,
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SUB_PART AS `col_length`
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FROM INFORMATION_SCHEMA.STATISTICS
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WHERE TABLE_SCHEMA = '{$schema}' AND TABLE_NAME = '{$table}'
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ORDER BY `key_name`, `key_type`, SEQ_IN_INDEX;
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EOT
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);
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$rows = [];
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foreach ($data as $row) {
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$name = $row['key_name'];
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if (!is_null($row['col_length'])) {
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$row['col'] = [$row['col'], (int) $row['col_length']];
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}
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unset($row['col_length']);
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if (!array_key_exists($name, $rows)) {
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$row['cols'] = [$row['col']];
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unset($row['col']);
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$rows[$name] = $row;
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} else {
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$rows[$name]['cols'][] = $row['col'];
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}
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}
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return array_values($rows);
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}
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/**
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* Pull foreign key information for the given table.
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*
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* @param string $table
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* @return array array of arrays
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* @throws PEAR_Exception
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*/
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private function fetchForeignKeyInfo(string $table): array
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{
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$schema = $this->conn->dsn['database'];
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$data = $this->fetchQueryData(
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<<<END
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SELECT CONSTRAINT_NAME AS `key_name`,
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COLUMN_NAME AS `col`,
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REFERENCED_TABLE_NAME AS `ref_table`,
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REFERENCED_COLUMN_NAME AS `ref_col`
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FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE
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WHERE TABLE_SCHEMA = '{$schema}'
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AND TABLE_NAME = '{$table}'
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AND REFERENCED_TABLE_SCHEMA = '{$schema}'
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ORDER BY `key_name`, ORDINAL_POSITION;
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END
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);
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$rows = [];
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foreach ($data as $row) {
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$name = $row['key_name'];
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if (!array_key_exists($name, $rows)) {
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$row['cols'] = [$row['col'] => $row['ref_col']];
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unset($row['col']);
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unset($row['ref_col']);
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$rows[$name] = $row;
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} else {
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$rows[$name]['cols'][$row['col']] = $row['ref_col'];
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}
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}
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return array_values($rows);
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}
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/**
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* Append an SQL statement with an index definition for a full-text search
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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 $def
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*/
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public function appendCreateFulltextIndex(array &$statements, $table, $name, array $def)
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{
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$statements[] = "CREATE FULLTEXT INDEX $name ON $table " . $this->buildIndexList($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 $def
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*/
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public function appendCreateIndex(array &$statements, $table, $name, array $def)
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{
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$statements[] = "ALTER TABLE {$this->quoteIdentifier($table)} "
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. "ADD INDEX {$name} {$this->buildIndexList($def)}";
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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
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* @param array $def
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* @return string;
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*
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*/
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public function endCreateTable($name, array $def)
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{
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$engine = $this->preferredEngine($def);
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return ") ENGINE=$engine CHARACTER SET utf8mb4 COLLATE utf8mb4_bin";
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}
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public function preferredEngine($def)
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{
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/* MyISAM is no longer required for fulltext indexes, fortunately
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if (!empty($def['fulltext indexes'])) {
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return 'MyISAM';
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}
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*/
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return 'InnoDB';
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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 $cd current column definition
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*/
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public function appendAlterModifyColumn(
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array &$phrase,
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string $columnName,
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array $old,
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array $cd
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): void {
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$phrase[] = 'MODIFY COLUMN ' . $this->quoteIdentifier($columnName)
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. ' ' . $this->columnSql($columnName, $cd);
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}
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/**
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* MySQL doesn't take 'DROP CONSTRAINT', need to treat primary keys as
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* if they were indexes here, but can use 'PRIMARY KEY' special name.
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*
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* @param array $phrase
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*/
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public function appendAlterDropPrimary(array &$phrase, string $tableName)
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{
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$phrase[] = 'DROP PRIMARY KEY';
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}
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/**
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* MySQL doesn't take 'DROP CONSTRAINT', need to treat unique keys as
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* if they were indexes here.
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*
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* @param array $phrase
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* @param string $keyName MySQL
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*/
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public function appendAlterDropUnique(array &$phrase, $keyName)
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{
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$phrase[] = 'DROP INDEX ' . $keyName;
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}
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public function appendAlterDropForeign(array &$phrase, $keyName)
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{
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$phrase[] = 'DROP FOREIGN KEY ' . $keyName;
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}
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/**
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* Throw some table metadata onto the ALTER TABLE if we have a mismatch
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* in expected type, collation.
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* @param array $phrase
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* @param $tableName
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* @param array $def
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* @throws Exception
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*/
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public function appendAlterExtras(array &$phrase, $tableName, array $def)
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{
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// Check for table properties: make sure we're using a sane
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// engine type and collation.
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// @fixme make the default engine configurable?
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$oldProps = $this->getTableProperties($tableName, ['ENGINE', 'TABLE_COLLATION']);
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$engine = $this->preferredEngine($def);
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if (strtolower($oldProps['ENGINE']) != strtolower($engine)) {
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$phrase[] = "ENGINE=$engine";
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}
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if (strtolower($oldProps['TABLE_COLLATION']) != 'utf8mb4_bin') {
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$phrase[] = 'CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_bin';
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$phrase[] = 'DEFAULT CHARACTER SET = utf8mb4';
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$phrase[] = 'DEFAULT COLLATE = utf8mb4_bin';
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}
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}
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/**
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* Append an SQL statement to drop an index from a table.
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* Note that in MariaDB index names are relation-specific.
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*
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* @param array $statements
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* @param string $table
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* @param string $name
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*/
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public function appendDropIndex(array &$statements, $table, $name)
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{
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$statements[] = "ALTER TABLE {$this->quoteIdentifier($table)} "
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. "DROP INDEX {$name}";
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}
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private function isNumericType(array $cd): bool
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{
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$ints = array_map(
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function ($s) {
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return $s . 'int';
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},
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['tiny', 'small', 'medium', 'big']
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);
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$ints = array_merge($ints, ['int', 'numeric', 'serial']);
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return in_array(strtolower($cd['type']), $ints);
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}
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/**
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* Is this column a string type?
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* @param array $cd
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* @return bool
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*/
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private function isStringType(array $cd): bool
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{
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$strings = ['char', 'varchar', 'text'];
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return in_array(strtolower($cd['type']), $strings);
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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 string $name column name to create
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* @param array $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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public function columnSql(string $name, array $cd)
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{
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$line = [];
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$line[] = parent::columnSql($name, $cd);
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// This'll have been added from our transform of "serial" type
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if (!empty($cd['auto_increment'])) {
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$line[] = 'AUTO_INCREMENT';
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}
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if (!empty($cd['description'])) {
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$line[] = 'COMMENT';
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$line[] = $this->quoteValue($cd['description']);
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}
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return implode(' ', $line);
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}
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public function mapType($column)
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{
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$map = [
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'integer' => 'int',
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'numeric' => 'decimal',
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];
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$type = $column['type'];
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if (isset($map[$type])) {
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$type = $map[$type];
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}
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if (!empty($column['size'])) {
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$size = $column['size'];
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if ($type == 'int' &&
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in_array($size, ['tiny', 'small', 'medium', 'big'])) {
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$type = $size . $type;
|
|
} elseif ($type == 'float' && $size == 'big') {
|
|
$type = 'double';
|
|
} elseif (in_array($type, ['blob', 'text']) &&
|
|
in_array($size, ['tiny', 'medium', 'long'])) {
|
|
$type = $size . $type;
|
|
}
|
|
}
|
|
|
|
return $type;
|
|
}
|
|
|
|
public function typeAndSize(string $name, array $column)
|
|
{
|
|
if ($column['type'] === 'enum') {
|
|
$vals = [];
|
|
foreach ($column['enum'] as &$val) {
|
|
$vals[] = "'{$val}'";
|
|
}
|
|
return 'enum(' . implode(',', $vals) . ')';
|
|
} elseif ($this->isStringType($column)) {
|
|
$col = parent::typeAndSize($name, $column);
|
|
if (!empty($column['collate'])) {
|
|
$col .= ' COLLATE ' . $column['collate'];
|
|
}
|
|
return $col;
|
|
} else {
|
|
return parent::typeAndSize($name, $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 string $tableName
|
|
* @param array $tableDef
|
|
* @return array
|
|
*/
|
|
public function filterDef(string $tableName, array $tableDef)
|
|
{
|
|
$tableDef = parent::filterDef($tableName, $tableDef);
|
|
|
|
// Get existing table collation if the table exists.
|
|
// To know if collation that's been set is unique for the table.
|
|
try {
|
|
$table_props = $this->getTableProperties($tableName, ['TABLE_COLLATION']);
|
|
$table_collate = $table_props['TABLE_COLLATION'];
|
|
} catch (SchemaTableMissingException $e) {
|
|
$table_collate = null;
|
|
}
|
|
|
|
foreach ($tableDef['fields'] as $name => &$col) {
|
|
switch ($col['type']) {
|
|
case 'serial':
|
|
$col['type'] = 'int';
|
|
$col['auto_increment'] = true;
|
|
break;
|
|
case 'bool':
|
|
$col['type'] = 'int';
|
|
$col['size'] = 'tiny';
|
|
$col['default'] = (int) $col['default'];
|
|
break;
|
|
}
|
|
|
|
if (!empty($col['collate'])
|
|
&& $col['collate'] === $table_collate) {
|
|
unset($col['collate']);
|
|
}
|
|
|
|
$col['type'] = $this->mapType($col);
|
|
unset($col['size']);
|
|
}
|
|
if (!common_config('db', 'mysql_foreign_keys')) {
|
|
unset($tableDef['foreign keys']);
|
|
}
|
|
return $tableDef;
|
|
}
|
|
}
|