2d0807bc1c
Fetching basic column data and unique indexes. Still needs detail work, multi-value indexes, foreign keys, and distinguishing the primary key. Since we don't get comments and such, for cleaner comparisons we should probably do a filtering on supported features.
433 lines
12 KiB
PHP
433 lines
12 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 Brenda Wallace <shiny@cpan.org>
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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 PgsqlSchema extends Schema
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{
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/**
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* Returns a table definition array 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 $table Name of the table to get
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*
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* @return array tabledef for that table.
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*/
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public function getTableDef($table)
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{
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$def = array();
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$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 = array();
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// ??
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list($type, $size) = $this->reverseMapType($row['udt_name']);
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$field['type'] = $type;
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if ($size !== null) {
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$field['size'] = $size;
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}
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if ($type == 'char' || $type == 'varchar') {
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if ($row['character_maximum_length'] !== null) {
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$field['length'] = intval($row['character_maximum_length']);
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}
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}
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if ($type == 'numeric') {
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// Other int types may report these values, but they're irrelevant.
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// Just ignore them!
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if ($row['numeric_precision'] !== null) {
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$field['precision'] = intval($row['numeric_precision']);
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}
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if ($row['numeric_scale'] !== null) {
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$field['scale'] = intval($row['numeric_scale']);
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}
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}
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if ($row['is_nullable'] == 'NO') {
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$field['not null'] = true;
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}
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if ($row['column_default'] !== null) {
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$field['default'] = $row['column_default'];
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if ($this->isNumericType($type)) {
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$field['default'] = intval($field['default']);
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}
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}
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$def['fields'][$name] = $field;
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}
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// Pull constraint data from INFORMATION_SCHEMA
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// @fixme also find multi-val indexes
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// @fixme distinguish the primary key
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// @fixme pull foreign key references
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$keyColumns = $this->fetchMetaInfo($table, 'key_column_usage', 'constraint_name,ordinal_position');
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$keys = array();
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foreach ($keyColumns as $row) {
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$keyName = $row['constraint_name'];
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$keyCol = $row['column_name'];
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if (!isset($keys[$keyName])) {
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$keys[$keyName] = array();
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}
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$keys[$keyName][] = $keyCol;
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}
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foreach ($keys as $keyName => $cols) {
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$def['unique indexes'][$keyName] = $cols;
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}
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return $def;
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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 $table
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* @return array of arrays
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*/
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function fetchMetaInfo($table, $infoTable, $orderBy=null)
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{
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$query = "SELECT * FROM information_schema.%s " .
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"WHERE table_name='%s'";
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$sql = sprintf($query, $infoTable, $table);
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if ($orderBy) {
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$sql .= ' ORDER BY ' . $orderBy;
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}
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return $this->fetchQueryData($sql);
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}
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/**
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* Creates a table with the given names and columns.
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*
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* @param string $name Name of the table
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* @param array $columns Array of ColumnDef objects
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* for new table.
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*
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* @return boolean success flag
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*/
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public function createTable($name, $columns)
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{
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$uniques = array();
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$primary = array();
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$indices = array();
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$onupdate = array();
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$sql = "CREATE TABLE $name (\n";
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for ($i = 0; $i < count($columns); $i++) {
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$cd =& $columns[$i];
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if ($i > 0) {
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$sql .= ",\n";
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}
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$sql .= $this->_columnSql($cd);
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switch ($cd->key) {
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case 'UNI':
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$uniques[] = $cd->name;
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break;
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case 'PRI':
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$primary[] = $cd->name;
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break;
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case 'MUL':
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$indices[] = $cd->name;
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break;
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}
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}
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if (count($primary) > 0) { // it really should be...
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$sql .= ",\n PRIMARY KEY (" . implode(',', $primary) . ")";
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}
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$sql .= "); ";
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foreach ($uniques as $u) {
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$sql .= "\n CREATE index {$name}_{$u}_idx ON {$name} ($u); ";
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}
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foreach ($indices as $i) {
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$sql .= "CREATE index {$name}_{$i}_idx ON {$name} ($i)";
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}
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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(). ' SQL was '. $sql);
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}
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return true;
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}
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/**
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* Translate the (mostly) mysql-ish column types into somethings more standard
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* @param string column type
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*
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* @return string postgres happy column type
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*/
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private function _columnTypeTranslation($type) {
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$map = array(
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'datetime' => 'timestamp',
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);
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if(!empty($map[$type])) {
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return $map[$type];
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}
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return $type;
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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 $table ALTER COLUMN TYPE " .
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$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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* Ensures that a table exists with the given
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* name and the given column definitions.
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*
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* If the table does not yet exist, it will
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* create the table. If it does exist, it will
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* alter the table to match the column definitions.
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*
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* @param string $tableName name of the table
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* @param array $columns array of ColumnDef
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* objects for the table
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*
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* @return boolean success flag
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*/
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public function ensureTable($tableName, $columns)
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{
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// XXX: DB engine portability -> toilet
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try {
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$td = $this->getTableDef($tableName);
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} catch (Exception $e) {
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if (preg_match('/no such table/', $e->getMessage())) {
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return $this->createTable($tableName, $columns);
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} else {
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throw $e;
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}
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}
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$cur = $this->_names($td->columns);
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$new = $this->_names($columns);
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$toadd = array_diff($new, $cur);
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$todrop = array_diff($cur, $new);
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$same = array_intersect($new, $cur);
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$tomod = array();
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foreach ($same as $m) {
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$curCol = $this->_byName($td->columns, $m);
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$newCol = $this->_byName($columns, $m);
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if (!$newCol->equals($curCol)) {
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// BIG GIANT TODO!
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// stop it detecting different types and trying to modify on every page request
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// $tomod[] = $newCol->name;
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}
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}
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if (count($toadd) + count($todrop) + count($tomod) == 0) {
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// nothing to do
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return true;
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}
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// For efficiency, we want this all in one
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// query, instead of using our methods.
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$phrase = array();
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foreach ($toadd as $columnName) {
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$cd = $this->_byName($columns, $columnName);
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$phrase[] = 'ADD COLUMN ' . $this->_columnSql($cd);
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}
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foreach ($todrop as $columnName) {
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$phrase[] = 'DROP COLUMN ' . $columnName;
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}
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foreach ($tomod as $columnName) {
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$cd = $this->_byName($columns, $columnName);
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/* brute force */
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$phrase[] = 'DROP COLUMN ' . $columnName;
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$phrase[] = 'ADD COLUMN ' . $this->_columnSql($cd);
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}
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$sql = 'ALTER TABLE ' . $tableName . ' ' . implode(', ', $phrase);
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$res = $this->conn->query($sql);
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if (PEAR::isError($res)) {
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throw new Exception($res->getMessage());
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}
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return true;
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}
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/**
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* 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 $tableName
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* @param array $tableDef
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* @param string $columnName
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* @param array $cd column to create
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*
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* @return string correct SQL for that column
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*/
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function columnSql($name, array $cd)
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{
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$line = array();
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$line[] = parent::_columnSql($cd);
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if ($table['foreign keys'][$name]) {
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foreach ($table['foreign keys'][$name] as $foreignTable => $foreignColumn) {
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$line[] = 'references';
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$line[] = $this->quoteId($foreignTable);
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$line[] = '(' . $this->quoteId($foreignColumn) . ')';
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}
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}
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return implode(' ', $line);
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}
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function mapType($column)
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{
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$map = array('serial' => 'bigserial', // FIXME: creates the wrong name for the sequence for some internal sequence-lookup function, so better fix this to do the real 'create sequence' dance.
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'numeric' => 'decimal',
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'datetime' => 'timestamp',
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'blob' => 'bytea');
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$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 == 'integer' &&
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in_array($size, array('small', 'big'))) {
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$type = $size . 'int';
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}
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}
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return $type;
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}
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// @fixme need name... :P
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function typeAndSize($column)
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{
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if ($column['type'] == 'enum') {
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$vals = array_map(array($this, 'quote'), $column['enum']);
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return "text check ($name in " . implode(',', $vals) . ')';
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} else {
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return parent::typeAndSize($column);
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}
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}
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/**
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* Map a native type back to an independent type + size
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*
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* @param string $type
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* @return array ($type, $size) -- $size may be null
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*/
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protected function reverseMapType($type)
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{
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$type = strtolower($type);
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$map = array(
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'int4' => array('int', null),
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'int8' => array('int', 'big'),
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'bytea' => array('blob', null),
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);
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if (isset($map[$type])) {
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return $map[$type];
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} else {
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return array($type, null);
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}
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}
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}
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