457 lines
15 KiB
PHP
457 lines
15 KiB
PHP
<?php
|
|
// This file is part of GNU social - https://www.gnu.org/software/social
|
|
//
|
|
// GNU social 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.
|
|
//
|
|
// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
/**
|
|
* Database schema for PostgreSQL
|
|
*
|
|
* @category Database
|
|
* @package GNUsocial
|
|
* @author Evan Prodromou <evan@status.net>
|
|
* @author Brenda Wallace <shiny@cpan.org>
|
|
* @author Brion Vibber <brion@status.net>
|
|
* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
|
|
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
|
|
*/
|
|
|
|
defined('GNUSOCIAL') || die();
|
|
|
|
/**
|
|
* Class representing the database schema for PostgreSQL
|
|
*
|
|
* A class representing the database schema. Can be used to
|
|
* manipulate the schema -- especially for plugins and upgrade
|
|
* utilities.
|
|
*
|
|
* @copyright 2019 Free Software Foundation, Inc http://www.fsf.org
|
|
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
|
|
*/
|
|
class PgsqlSchema extends Schema
|
|
{
|
|
|
|
/**
|
|
* Returns a table definition array for the table
|
|
* in the schema with the given name.
|
|
*
|
|
* Throws an exception if the table is not found.
|
|
*
|
|
* @param string $table Name of the table to get
|
|
*
|
|
* @return array tabledef for that table.
|
|
* @throws SchemaTableMissingException
|
|
*/
|
|
|
|
public function getTableDef($table)
|
|
{
|
|
$def = [];
|
|
$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");
|
|
}
|
|
|
|
// We'll need to match up fields by ordinal reference
|
|
$orderedFields = [];
|
|
|
|
foreach ($columns as $row) {
|
|
|
|
$name = $row['column_name'];
|
|
$orderedFields[$row['ordinal_position']] = $name;
|
|
|
|
$field = [];
|
|
$field['type'] = $type = $row['udt_name'];
|
|
|
|
if ($type == 'char' || $type == 'varchar') {
|
|
if ($row['character_maximum_length'] !== null) {
|
|
$field['length'] = intval($row['character_maximum_length']);
|
|
}
|
|
}
|
|
if ($type == 'numeric') {
|
|
// Other int types may report these values, but they're irrelevant.
|
|
// Just ignore them!
|
|
if ($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']);
|
|
}
|
|
}
|
|
|
|
$def['fields'][$name] = $field;
|
|
}
|
|
|
|
// Pulling index info from pg_class & pg_index
|
|
// This can give us primary & unique key info, but not foreign key constraints
|
|
// so we exclude them and pick them up later.
|
|
$indexInfo = $this->getIndexInfo($table);
|
|
foreach ($indexInfo as $row) {
|
|
$keyName = $row['key_name'];
|
|
|
|
// Dig the column references out!
|
|
//
|
|
// These are inconvenient arrays with partial references to the
|
|
// pg_att table, but since we've already fetched up the column
|
|
// info on the current table, we can look those up locally.
|
|
$cols = [];
|
|
$colPositions = explode(' ', $row['indkey']);
|
|
foreach ($colPositions as $ord) {
|
|
if ($ord == 0) {
|
|
$cols[] = 'FUNCTION'; // @fixme
|
|
} else {
|
|
$cols[] = $orderedFields[$ord];
|
|
}
|
|
}
|
|
|
|
$def['indexes'][$keyName] = $cols;
|
|
}
|
|
|
|
// Pull constraint data from INFORMATION_SCHEMA:
|
|
// Primary key, unique keys, foreign keys
|
|
$keyColumns = $this->fetchMetaInfo($table, 'key_column_usage', 'constraint_name,ordinal_position');
|
|
$keys = [];
|
|
|
|
foreach ($keyColumns as $row) {
|
|
$keyName = $row['constraint_name'];
|
|
$keyCol = $row['column_name'];
|
|
if (!isset($keys[$keyName])) {
|
|
$keys[$keyName] = [];
|
|
}
|
|
$keys[$keyName][] = $keyCol;
|
|
}
|
|
|
|
foreach ($keys as $keyName => $cols) {
|
|
// name hack -- is this reliable?
|
|
if ($keyName == "{$table}_pkey") {
|
|
$def['primary key'] = $cols;
|
|
} else if (preg_match("/^{$table}_(.*)_fkey$/", $keyName, $matches)) {
|
|
$fkey = $this->getForeignKeyInfo($table, $keyName);
|
|
$colMap = array_combine($cols, $fkey['col_names']);
|
|
$def['foreign keys'][$keyName] = [$fkey['table_name'], $colMap];
|
|
} else {
|
|
$def['unique keys'][$keyName] = $cols;
|
|
}
|
|
}
|
|
return $def;
|
|
}
|
|
|
|
/**
|
|
* Pull some INFORMATION.SCHEMA data for the given table.
|
|
*
|
|
* @param string $table
|
|
* @param $infoTable
|
|
* @param null $orderBy
|
|
* @return array of arrays
|
|
* @throws PEAR_Exception
|
|
*/
|
|
function fetchMetaInfo($table, $infoTable, $orderBy = null)
|
|
{
|
|
$query = "SELECT * FROM information_schema.%s " .
|
|
"WHERE table_name='%s'";
|
|
$sql = sprintf($query, $infoTable, $table);
|
|
if ($orderBy) {
|
|
$sql .= ' ORDER BY ' . $orderBy;
|
|
}
|
|
return $this->fetchQueryData($sql);
|
|
}
|
|
|
|
/**
|
|
* Pull some PG-specific index info
|
|
* @param string $table
|
|
* @return array of arrays
|
|
* @throws PEAR_Exception
|
|
*/
|
|
function getIndexInfo($table)
|
|
{
|
|
$query = 'SELECT ' .
|
|
'(SELECT relname FROM pg_class WHERE oid=indexrelid) AS key_name, ' .
|
|
'* FROM pg_index ' .
|
|
'WHERE indrelid=(SELECT oid FROM pg_class WHERE relname=\'%s\') ' .
|
|
'AND indisprimary=\'f\' AND indisunique=\'f\' ' .
|
|
'ORDER BY indrelid, indexrelid';
|
|
$sql = sprintf($query, $table);
|
|
return $this->fetchQueryData($sql);
|
|
}
|
|
|
|
/**
|
|
* Column names from the foreign table can be resolved with a call to getTableColumnNames()
|
|
* @param string $table
|
|
* @param $constraint_name
|
|
* @return array array of rows with keys: fkey_name, table_name, table_id, col_names (array of strings)
|
|
* @throws PEAR_Exception
|
|
*/
|
|
function getForeignKeyInfo($table, $constraint_name)
|
|
{
|
|
// In a sane world, it'd be easier to query the column names directly.
|
|
// But it's pretty hard to work with arrays such as col_indexes in direct SQL here.
|
|
$query = 'SELECT ' .
|
|
'(SELECT relname FROM pg_class WHERE oid=confrelid) AS table_name, ' .
|
|
'confrelid AS table_id, ' .
|
|
'(SELECT indkey FROM pg_index WHERE indexrelid=conindid) AS col_indexes ' .
|
|
'FROM pg_constraint ' .
|
|
'WHERE conrelid=(SELECT oid FROM pg_class WHERE relname=\'%s\') ' .
|
|
'AND conname=\'%s\' ' .
|
|
'AND contype=\'f\'';
|
|
$sql = sprintf($query, $table, $constraint_name);
|
|
$data = $this->fetchQueryData($sql);
|
|
if (count($data) < 1) {
|
|
throw new Exception("Could not find foreign key " . $constraint_name . " on table " . $table);
|
|
}
|
|
|
|
$row = $data[0];
|
|
return [
|
|
'table_name' => $row['table_name'],
|
|
'col_names' => $this->getTableColumnNames($row['table_id'], $row['col_indexes'])
|
|
];
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @param int $table_id
|
|
* @param array $col_indexes
|
|
* @return array of strings
|
|
* @throws PEAR_Exception
|
|
*/
|
|
function getTableColumnNames($table_id, $col_indexes)
|
|
{
|
|
$indexes = array_map('intval', explode(' ', $col_indexes));
|
|
$query = 'SELECT attnum AS col_index, attname AS col_name ' .
|
|
'FROM pg_attribute where attrelid=%d ' .
|
|
'AND attnum IN (%s)';
|
|
$sql = sprintf($query, $table_id, implode(',', $indexes));
|
|
$data = $this->fetchQueryData($sql);
|
|
|
|
$byId = [];
|
|
foreach ($data as $row) {
|
|
$byId[$row['col_index']] = $row['col_name'];
|
|
}
|
|
|
|
$out = [];
|
|
foreach ($indexes as $id) {
|
|
$out[] = $byId[$id];
|
|
}
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* Translate the (mostly) mysql-ish column types into somethings more standard
|
|
* @param string column type
|
|
*
|
|
* @return string postgres happy column type
|
|
*/
|
|
private function _columnTypeTranslation($type)
|
|
{
|
|
$map = [
|
|
'datetime' => 'timestamp',
|
|
];
|
|
if (!empty($map[$type])) {
|
|
return $map[$type];
|
|
}
|
|
return $type;
|
|
}
|
|
|
|
/**
|
|
* Return the proper SQL for creating or
|
|
* altering a column.
|
|
*
|
|
* Appropriate for use in CREATE TABLE or
|
|
* ALTER TABLE statements.
|
|
*
|
|
* @param array $cd column to create
|
|
*
|
|
* @return string correct SQL for that column
|
|
*/
|
|
|
|
function columnSql(array $cd)
|
|
{
|
|
$line = [];
|
|
$line[] = parent::columnSql($cd);
|
|
|
|
/*
|
|
if ($table['foreign keys'][$name]) {
|
|
foreach ($table['foreign keys'][$name] as $foreignTable => $foreignColumn) {
|
|
$line[] = 'references';
|
|
$line[] = $this->quoteIdentifier($foreignTable);
|
|
$line[] = '(' . $this->quoteIdentifier($foreignColumn) . ')';
|
|
}
|
|
}
|
|
*/
|
|
|
|
return implode(' ', $line);
|
|
}
|
|
|
|
/**
|
|
* Append phrase(s) to an array of partial ALTER TABLE chunks in order
|
|
* to alter the given column from its old state to a new one.
|
|
*
|
|
* @param array $phrase
|
|
* @param string $columnName
|
|
* @param array $old previous column definition as found in DB
|
|
* @param array $cd current column definition
|
|
*/
|
|
function appendAlterModifyColumn(array &$phrase, $columnName, array $old, array $cd)
|
|
{
|
|
$prefix = 'ALTER COLUMN ' . $this->quoteIdentifier($columnName) . ' ';
|
|
|
|
$oldType = $this->mapType($old);
|
|
$newType = $this->mapType($cd);
|
|
if ($oldType != $newType) {
|
|
$phrase[] = $prefix . 'TYPE ' . $newType;
|
|
}
|
|
|
|
if (!empty($old['not null']) && empty($cd['not null'])) {
|
|
$phrase[] = $prefix . 'DROP NOT NULL';
|
|
} else if (empty($old['not null']) && !empty($cd['not null'])) {
|
|
$phrase[] = $prefix . 'SET NOT NULL';
|
|
}
|
|
|
|
if (isset($old['default']) && !isset($cd['default'])) {
|
|
$phrase[] = $prefix . 'DROP DEFAULT';
|
|
} else if (!isset($old['default']) && isset($cd['default'])) {
|
|
$phrase[] = $prefix . 'SET DEFAULT ' . $this->quoteDefaultValue($cd);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Append an SQL statement to drop an index from a table.
|
|
* Note that in PostgreSQL, index names are DB-unique.
|
|
*
|
|
* @param array $statements
|
|
* @param string $table
|
|
* @param string $name
|
|
*/
|
|
function appendDropIndex(array &$statements, $table, $name)
|
|
{
|
|
$statements[] = "DROP INDEX $name";
|
|
}
|
|
|
|
/**
|
|
* Quote a db/table/column identifier if necessary.
|
|
*
|
|
* @param string $name
|
|
* @return string
|
|
*/
|
|
function quoteIdentifier($name)
|
|
{
|
|
return $this->conn->quoteIdentifier($name);
|
|
}
|
|
|
|
function mapType($column)
|
|
{
|
|
$map = [
|
|
'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.
|
|
'numeric' => 'decimal',
|
|
'datetime' => 'timestamp',
|
|
'blob' => 'bytea'
|
|
];
|
|
|
|
$type = $column['type'];
|
|
if (isset($map[$type])) {
|
|
$type = $map[$type];
|
|
}
|
|
|
|
if ($type == 'int') {
|
|
if (!empty($column['size'])) {
|
|
$size = $column['size'];
|
|
if ($size == 'small') {
|
|
return 'int2';
|
|
} else if ($size == 'big') {
|
|
return 'int8';
|
|
}
|
|
}
|
|
return 'int4';
|
|
}
|
|
|
|
return $type;
|
|
}
|
|
|
|
// @fixme need name... :P
|
|
function typeAndSize($column)
|
|
{
|
|
if ($column['type'] == 'enum') {
|
|
$vals = array_map([$this, 'quote'], $column['enum']);
|
|
return "text check ($name in " . implode(',', $vals) . ')';
|
|
} else {
|
|
return parent::typeAndSize($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
|
|
* @return array
|
|
*/
|
|
function filterDef(array $tableDef)
|
|
{
|
|
foreach ($tableDef['fields'] as $name => &$col) {
|
|
// No convenient support for field descriptions
|
|
unset($col['description']);
|
|
|
|
/*
|
|
if (isset($col['size'])) {
|
|
// Don't distinguish between tinyint and int.
|
|
if ($col['size'] == 'tiny' && $col['type'] == 'int') {
|
|
unset($col['size']);
|
|
}
|
|
}
|
|
*/
|
|
$col['type'] = $this->mapType($col);
|
|
unset($col['size']);
|
|
}
|
|
if (!empty($tableDef['primary key'])) {
|
|
$tableDef['primary key'] = $this->filterKeyDef($tableDef['primary key']);
|
|
}
|
|
if (!empty($tableDef['unique keys'])) {
|
|
foreach ($tableDef['unique keys'] as $i => $def) {
|
|
$tableDef['unique keys'][$i] = $this->filterKeyDef($def);
|
|
}
|
|
}
|
|
return $tableDef;
|
|
}
|
|
|
|
/**
|
|
* Filter the given key/index definition to match features available
|
|
* in this database.
|
|
*
|
|
* @param array $def
|
|
* @return array
|
|
*/
|
|
function filterKeyDef(array $def)
|
|
{
|
|
// PostgreSQL doesn't like prefix lengths specified on keys...?
|
|
foreach ($def as $i => $item) {
|
|
if (is_array($item)) {
|
|
$def[$i] = $item[0];
|
|
}
|
|
}
|
|
return $def;
|
|
}
|
|
}
|