328 lines
8.3 KiB
PHP
328 lines
8.3 KiB
PHP
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<?php
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/**
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* Simple Machines Forum (SMF)
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*
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* @package SMF
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* @author Simple Machines http://www.simplemachines.org
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* @copyright 2011 Simple Machines
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* @license http://www.simplemachines.org/about/smf/license.php BSD
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*
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* @version 2.0
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*/
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if (!defined('SMF'))
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die('Hacking attempt...');
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/* This file contains rarely used extended database functionality.
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void db_extra_init()
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- add this file's functions to the $smcFunc array.
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resource smf_db_backup_table($table, $backup_table)
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- backup $table to $backup_table.
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- returns the request handle to the table creation query
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string function smf_db_get_version()
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- get the version number.
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string db_insert_sql(string table_name)
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- gets all the necessary INSERTs for the table named table_name.
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- goes in 250 row segments.
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- returns the query to insert the data back in.
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- returns an empty string if the table was empty.
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array smf_db_list_tables($db = false, $filter = false)
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- lists all tables in the database
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- could be filtered according to $filter
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- returns an array of table names. (strings)
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float smf_db_optimize_table($table)
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- optimize a table
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- $table - the table to be optimized
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- returns how much it was gained
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string db_table_sql(string table_name)
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- dumps the CREATE for the specified table. (by table_name.)
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- returns the CREATE statement.
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*/
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// Add the file functions to the $smcFunc array.
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function db_extra_init()
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{
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global $smcFunc;
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if (!isset($smcFunc['db_backup_table']) || $smcFunc['db_backup_table'] != 'smf_db_backup_table')
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$smcFunc += array(
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'db_backup_table' => 'smf_db_backup_table',
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'db_optimize_table' => 'smf_db_optimize_table',
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'db_insert_sql' => 'smf_db_insert_sql',
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'db_table_sql' => 'smf_db_table_sql',
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'db_list_tables' => 'smf_db_list_tables',
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'db_get_version' => 'smf_db_get_version',
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);
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}
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// Backup $table to $backup_table.
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function smf_db_backup_table($table, $backup_table)
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{
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global $smcFunc, $db_prefix;
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$table = str_replace('{db_prefix}', $db_prefix, $table);
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// Do we need to drop it first?
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$tables = smf_db_list_tables(false, $backup_table);
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if (!empty($tables))
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$smcFunc['db_query']('', '
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DROP TABLE {raw:backup_table}',
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array(
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'backup_table' => $backup_table,
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)
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);
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//!!! Should we create backups of sequences as well?
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$smcFunc['db_query']('', '
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CREATE TABLE {raw:backup_table}
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(
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LIKE {raw:table}
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INCLUDING DEFAULTS
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)',
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array(
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'backup_table' => $backup_table,
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'table' => $table,
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)
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);
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$smcFunc['db_query']('', '
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INSERT INTO {raw:backup_table}
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SELECT * FROM {raw:table}',
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array(
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'backup_table' => $backup_table,
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'table' => $table,
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)
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);
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}
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// Optimize a table - return data freed!
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function smf_db_optimize_table($table)
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{
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global $smcFunc, $db_prefix;
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$table = str_replace('{db_prefix}', $db_prefix, $table);
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$request = $smcFunc['db_query']('', '
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VACUUM ANALYZE {raw:table}',
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array(
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'table' => $table,
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)
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);
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if (!$request)
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return -1;
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$row = $smcFunc['db_fetch_assoc']($request);
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$smcFunc['db_free_result']($request);
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if (isset($row['Data_free']))
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return $row['Data_free'] / 1024;
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else
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return 0;
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}
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// List all the tables in the database.
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function smf_db_list_tables($db = false, $filter = false)
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{
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global $smcFunc;
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$request = $smcFunc['db_query']('', '
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SELECT tablename
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FROM pg_tables
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WHERE schemaname = {string:schema_public}' . ($filter == false ? '' : '
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AND tablename LIKE {string:filter}') . '
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ORDER BY tablename',
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array(
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'schema_public' => 'public',
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'filter' => $filter,
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)
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);
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$tables = array();
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while ($row = $smcFunc['db_fetch_row']($request))
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$tables[] = $row[0];
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$smcFunc['db_free_result']($request);
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return $tables;
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}
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// Get the content (INSERTs) for a table.
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function smf_db_insert_sql($tableName)
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{
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global $smcFunc, $db_prefix;
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$tableName = str_replace('{db_prefix}', $db_prefix, $tableName);
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// This will be handy...
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$crlf = "\r\n";
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// Get everything from the table.
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$result = $smcFunc['db_query']('', '
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SELECT *
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FROM {raw:table}',
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array(
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'table' => $tableName,
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)
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);
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// The number of rows, just for record keeping and breaking INSERTs up.
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$num_rows = $smcFunc['db_num_rows']($result);
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if ($num_rows == 0)
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return '';
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$fields = array_keys($smcFunc['db_fetch_assoc']($result));
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$smcFunc['db_data_seek']($result, 0);
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// Start it off with the basic INSERT INTO.
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$data = '';
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$insert_msg = $crlf . 'INSERT INTO ' . $tableName . $crlf . "\t" . '(' . implode(', ', $fields) . ')' . $crlf . 'VALUES ' . $crlf . "\t";
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// Loop through each row.
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while ($row = $smcFunc['db_fetch_row']($result))
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{
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// Get the fields in this row...
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$field_list = array();
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for ($j = 0; $j < $smcFunc['db_num_fields']($result); $j++)
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{
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// Try to figure out the type of each field. (NULL, number, or 'string'.)
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if (!isset($row[$j]))
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$field_list[] = 'NULL';
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elseif (is_numeric($row[$j]) && (int) $row[$j] == $row[$j])
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$field_list[] = $row[$j];
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else
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$field_list[] = '\'' . $smcFunc['db_escape_string']($row[$j]) . '\'';
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}
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// 'Insert' the data.
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$data .= $insert_msg . '(' . implode(', ', $field_list) . ');';
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}
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$smcFunc['db_free_result']($result);
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// Return an empty string if there were no rows.
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return $num_rows == 0 ? '' : $data;
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}
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// Get the schema (CREATE) for a table.
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function smf_db_table_sql($tableName)
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{
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global $smcFunc, $db_prefix;
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$tableName = str_replace('{db_prefix}', $db_prefix, $tableName);
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// This will be needed...
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$crlf = "\r\n";
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// Start the create table...
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$schema_create = 'CREATE TABLE ' . $tableName . ' (' . $crlf;
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$index_create = '';
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$seq_create = '';
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// Find all the fields.
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$result = $smcFunc['db_query']('', '
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SELECT column_name, column_default, is_nullable, data_type, character_maximum_length
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FROM information_schema.columns
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WHERE table_name = {string:table}
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ORDER BY ordinal_position',
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array(
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'table' => $tableName,
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)
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);
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while ($row = $smcFunc['db_fetch_assoc']($result))
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{
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if ($row['data_type'] == 'character varying')
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$row['data_type'] = 'varchar';
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elseif ($row['data_type'] == 'character')
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$row['data_type'] = 'char';
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if ($row['character_maximum_length'])
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$row['data_type'] .= '(' . $row['character_maximum_length'] . ')';
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// Make the CREATE for this column.
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$schema_create .= ' "' . $row['column_name'] . '" ' . $row['data_type'] . ($row['is_nullable'] != 'YES' ? ' NOT NULL' : '');
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// Add a default...?
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if (trim($row['column_default']) != '')
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{
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$schema_create .= ' default ' . $row['column_default'] . '';
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// Auto increment?
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if (preg_match('~nextval\(\'(.+?)\'(.+?)*\)~i', $row['column_default'], $matches) != 0)
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{
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// Get to find the next variable first!
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$count_req = $smcFunc['db_query']('', '
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SELECT MAX("{raw:column}")
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FROM {raw:table}',
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array(
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'column' => $row['column_name'],
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'table' => $tableName,
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)
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);
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list ($max_ind) = $smcFunc['db_fetch_row']($count_req);
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$smcFunc['db_free_result']($count_req);
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// Get the right bloody start!
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$seq_create .= 'CREATE SEQUENCE ' . $matches[1] . ' START WITH ' . ($max_ind + 1) . ';' . $crlf . $crlf;
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}
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}
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$schema_create .= ',' . $crlf;
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}
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$smcFunc['db_free_result']($result);
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// Take off the last comma.
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$schema_create = substr($schema_create, 0, -strlen($crlf) - 1);
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$result = $smcFunc['db_query']('', '
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SELECT CASE WHEN i.indisprimary THEN 1 ELSE 0 END AS is_primary, pg_get_indexdef(i.indexrelid) AS inddef
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FROM pg_class AS c
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INNER JOIN pg_index AS i ON (i.indrelid = c.oid)
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INNER JOIN pg_class AS c2 ON (c2.oid = i.indexrelid)
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WHERE c.relname = {string:table}',
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array(
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'table' => $tableName,
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)
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);
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$indexes = array();
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while ($row = $smcFunc['db_fetch_assoc']($result))
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{
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if ($row['is_primary'])
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{
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if (preg_match('~\(([^\)]+?)\)~i', $row['inddef'], $matches) == 0)
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continue;
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$index_create .= $crlf . 'ALTER TABLE ' . $tableName . ' ADD PRIMARY KEY ("' . $matches[1] . '");';
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}
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else
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$index_create .= $crlf . $row['inddef'] . ';';
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}
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$smcFunc['db_free_result']($result);
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// Finish it off!
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$schema_create .= $crlf . ');';
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return $seq_create . $schema_create . $index_create;
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}
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// Get the version number.
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function smf_db_get_version()
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{
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global $smcFunc;
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$request = $smcFunc['db_query']('', '
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SHOW server_version',
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array(
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)
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);
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list ($ver) = $smcFunc['db_fetch_row']($request);
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$smcFunc['db_free_result']($request);
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return $ver;
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}
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?>
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