simple-machines-forum/Sources/DbExtra-postgresql.php

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2024-07-22 14:45:07 +00:00
<?php
/**
* This file contains rarely used extended database functionality.
*
* Simple Machines Forum (SMF)
*
* @package SMF
* @author Simple Machines https://www.simplemachines.org
* @copyright 2022 Simple Machines and individual contributors
* @license https://www.simplemachines.org/about/smf/license.php BSD
*
* @version 2.1.0
*/
if (!defined('SMF'))
die('No direct access...');
/**
* Add the functions implemented in this file to the $smcFunc array.
*/
function db_extra_init()
{
global $smcFunc;
if (!isset($smcFunc['db_backup_table']) || $smcFunc['db_backup_table'] != 'smf_db_backup_table')
$smcFunc += array(
'db_backup_table' => 'smf_db_backup_table',
'db_optimize_table' => 'smf_db_optimize_table',
'db_table_sql' => 'smf_db_table_sql',
'db_list_tables' => 'smf_db_list_tables',
'db_get_version' => 'smf_db_get_version',
'db_get_vendor' => 'smf_db_get_vendor',
'db_allow_persistent' => 'smf_db_allow_persistent',
);
}
/**
* Backup $table to $backup_table.
*
* @param string $table The name of the table to backup
* @param string $backup_table The name of the backup table for this table
* @return resource -the request handle to the table creation query
*/
function smf_db_backup_table($table, $backup_table)
{
global $smcFunc, $db_prefix;
$table = str_replace('{db_prefix}', $db_prefix, $table);
// Do we need to drop it first?
$tables = smf_db_list_tables(false, $backup_table);
if (!empty($tables))
$smcFunc['db_query']('', '
DROP TABLE {raw:backup_table}',
array(
'backup_table' => $backup_table,
)
);
/**
* @todo Should we create backups of sequences as well?
*/
$smcFunc['db_query']('', '
CREATE TABLE {raw:backup_table}
(
LIKE {raw:table}
INCLUDING DEFAULTS
)',
array(
'backup_table' => $backup_table,
'table' => $table,
)
);
$smcFunc['db_query']('', '
INSERT INTO {raw:backup_table}
SELECT * FROM {raw:table}',
array(
'backup_table' => $backup_table,
'table' => $table,
)
);
}
/**
* This function optimizes a table.
*
* @param string $table The table to be optimized
* @return int How much space was gained
*/
function smf_db_optimize_table($table)
{
global $smcFunc, $db_prefix;
$table = str_replace('{db_prefix}', $db_prefix, $table);
$pg_tables = array('pg_catalog', 'information_schema');
$request = $smcFunc['db_query']('', '
SELECT pg_relation_size(C.oid) AS "size"
FROM pg_class C
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE nspname NOT IN ({array_string:pg_tables})
AND relname = {string:table}',
array(
'table' => $table,
'pg_tables' => $pg_tables,
)
);
$row = $smcFunc['db_fetch_assoc']($request);
$smcFunc['db_free_result']($request);
$old_size = $row['size'];
$request = $smcFunc['db_query']('', '
VACUUM FULL ANALYZE {raw:table}',
array(
'table' => $table,
)
);
if (!$request)
return -1;
$request = $smcFunc['db_query']('', '
SELECT pg_relation_size(C.oid) AS "size"
FROM pg_class C
LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
WHERE nspname NOT IN ({array_string:pg_tables})
AND relname = {string:table}',
array(
'table' => $table,
'pg_tables' => $pg_tables,
)
);
$row = $smcFunc['db_fetch_assoc']($request);
$smcFunc['db_free_result']($request);
if (isset($row['size']))
return ($old_size - $row['size']) / 1024;
else
return 0;
}
/**
* This function lists all tables in the database.
* The listing could be filtered according to $filter.
*
* @param string|boolean $db string The database name or false to use the current DB
* @param string|boolean $filter String to filter by or false to list all tables
* @return array An array of table names
*/
function smf_db_list_tables($db = false, $filter = false)
{
global $smcFunc;
$request = $smcFunc['db_query']('', '
SELECT tablename
FROM pg_tables
WHERE schemaname = {string:schema_public}' . ($filter == false ? '' : '
AND tablename LIKE {string:filter}') . '
ORDER BY tablename',
array(
'schema_public' => 'public',
'filter' => $filter,
)
);
$tables = array();
while ($row = $smcFunc['db_fetch_row']($request))
$tables[] = $row[0];
$smcFunc['db_free_result']($request);
return $tables;
}
/**
* Dumps the schema (CREATE) for a table.
*
* @todo why is this needed for?
* @param string $tableName The name of the table
* @return string The "CREATE TABLE" SQL string for this table
*/
function smf_db_table_sql($tableName)
{
global $smcFunc, $db_prefix;
$tableName = str_replace('{db_prefix}', $db_prefix, $tableName);
// This will be needed...
$crlf = "\r\n";
// Drop it if it exists.
$schema_create = 'DROP TABLE IF EXISTS ' . $tableName . ';' . $crlf . $crlf;
// Start the create table...
$schema_create .= 'CREATE TABLE ' . $tableName . ' (' . $crlf;
$index_create = '';
$seq_create = '';
// Find all the fields.
$result = $smcFunc['db_query']('', '
SELECT column_name, column_default, is_nullable, data_type, character_maximum_length
FROM information_schema.columns
WHERE table_name = {string:table}
ORDER BY ordinal_position',
array(
'table' => $tableName,
)
);
while ($row = $smcFunc['db_fetch_assoc']($result))
{
if ($row['data_type'] == 'character varying')
$row['data_type'] = 'varchar';
elseif ($row['data_type'] == 'character')
$row['data_type'] = 'char';
if ($row['character_maximum_length'])
$row['data_type'] .= '(' . $row['character_maximum_length'] . ')';
// Make the CREATE for this column.
$schema_create .= ' "' . $row['column_name'] . '" ' . $row['data_type'] . ($row['is_nullable'] != 'YES' ? ' NOT NULL' : '');
// Add a default...?
if (trim($row['column_default']) != '')
{
$schema_create .= ' default ' . $row['column_default'] . '';
// Auto increment?
if (preg_match('~nextval\(\'(.+?)\'(.+?)*\)~i', $row['column_default'], $matches) != 0)
{
// Get to find the next variable first!
$count_req = $smcFunc['db_query']('', '
SELECT MAX("{raw:column}")
FROM {raw:table}',
array(
'column' => $row['column_name'],
'table' => $tableName,
)
);
list ($max_ind) = $smcFunc['db_fetch_row']($count_req);
$smcFunc['db_free_result']($count_req);
// Get the right bloody start!
$seq_create .= 'CREATE SEQUENCE ' . $matches[1] . ' START WITH ' . ($max_ind + 1) . ';' . $crlf . $crlf;
}
}
$schema_create .= ',' . $crlf;
}
$smcFunc['db_free_result']($result);
// Take off the last comma.
$schema_create = substr($schema_create, 0, -strlen($crlf) - 1);
$result = $smcFunc['db_query']('', '
SELECT pg_get_indexdef(i.indexrelid) AS inddef
FROM pg_class AS c
INNER JOIN pg_index AS i ON (i.indrelid = c.oid)
INNER JOIN pg_class AS c2 ON (c2.oid = i.indexrelid)
WHERE c.relname = {string:table} AND i.indisprimary is {raw:pk}',
array(
'table' => $tableName,
'pk' => 'false',
)
);
while ($row = $smcFunc['db_fetch_assoc']($result))
{
$index_create .= $crlf . $row['inddef'] . ';';
}
$smcFunc['db_free_result']($result);
$result = $smcFunc['db_query']('', '
SELECT pg_get_constraintdef(c.oid) as pkdef
FROM pg_constraint as c
WHERE c.conrelid::regclass::text = {string:table} AND
c.contype = {string:constraintType}',
array(
'table' => $tableName,
'constraintType' => 'p',
)
);
while ($row = $smcFunc['db_fetch_assoc']($result))
{
$index_create .= $crlf . 'ALTER TABLE ' . $tableName . ' ADD ' . $row['pkdef'] . ';';
}
$smcFunc['db_free_result']($result);
// Finish it off!
$schema_create .= $crlf . ');';
return $seq_create . $schema_create . $index_create;
}
/**
* Get the version number.
*
* @return string The version
*/
function smf_db_get_version()
{
global $db_connection;
static $ver;
if (!empty($ver))
return $ver;
$ver = pg_version($db_connection)['server'];
return $ver;
}
/**
* Return PostgreSQL
*
* @return string The database engine we are using
*/
function smf_db_get_vendor()
{
return 'PostgreSQL';
}
/**
* Figures out if persistent connection is allowed
*
* @return boolean
*/
function smf_db_allow_persistent()
{
$value = ini_get('pgsql.allow_persistent');
if (strtolower($value) == 'on' || strtolower($value) == 'true' || $value == '1')
return true;
else
return false;
}
?>