/include/dblayer/sqlite.php
PHP | 601 lines | 406 code | 156 blank | 39 comment | 76 complexity | 230c97846030552c1dee163bbf5d7f31 MD5 | raw file
- <?php
- /**
- * Copyright (C) 2008-2012 FluxBB
- * based on code by Rickard Andersson copyright (C) 2002-2008 PunBB
- * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher
- */
- // Make sure we have built in support for SQLite
- if (!function_exists('sqlite_open'))
- exit('This PHP environment doesn\'t have SQLite support built in. SQLite support is required if you want to use a SQLite database to run this forum. Consult the PHP documentation for further assistance.');
- class DBLayer
- {
- var $prefix;
- var $link_id;
- var $query_result;
- var $in_transaction = 0;
- var $saved_queries = array();
- var $num_queries = 0;
- var $error_no = false;
- var $error_msg = 'Unknown';
- var $datatype_transformations = array(
- '%^SERIAL$%' => 'INTEGER',
- '%^(TINY|SMALL|MEDIUM|BIG)?INT( )?(\\([0-9]+\\))?( )?(UNSIGNED)?$%i' => 'INTEGER',
- '%^(TINY|MEDIUM|LONG)?TEXT$%i' => 'TEXT'
- );
- function __construct($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect)
- {
- // Prepend $db_name with the path to the forum root directory
- $db_name = PUN_ROOT.$db_name;
- $this->prefix = $db_prefix;
- if (!file_exists($db_name))
- {
- @touch($db_name);
- @chmod($db_name, 0666);
- if (!file_exists($db_name))
- error('Unable to create new database \''.$db_name.'\'. Permission denied', __FILE__, __LINE__);
- }
- if (!is_readable($db_name))
- error('Unable to open database \''.$db_name.'\' for reading. Permission denied', __FILE__, __LINE__);
- if (!forum_is_writable($db_name))
- error('Unable to open database \''.$db_name.'\' for writing. Permission denied', __FILE__, __LINE__);
- if ($p_connect)
- $this->link_id = @sqlite_popen($db_name, 0666, $sqlite_error);
- else
- $this->link_id = @sqlite_open($db_name, 0666, $sqlite_error);
- if (!$this->link_id)
- error('Unable to open database \''.$db_name.'\'. SQLite reported: '.$sqlite_error, __FILE__, __LINE__);
- else
- return $this->link_id;
- }
-
-
- function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect)
- {
- $this->__construct($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect);
- }
- function start_transaction()
- {
- ++$this->in_transaction;
- return (@sqlite_query($this->link_id, 'BEGIN')) ? true : false;
- }
- function end_transaction()
- {
- --$this->in_transaction;
- if (@sqlite_query($this->link_id, 'COMMIT'))
- return true;
- else
- {
- @sqlite_query($this->link_id, 'ROLLBACK');
- return false;
- }
- }
- function query($sql, $unbuffered = false)
- {
- if (defined('PUN_SHOW_QUERIES'))
- $q_start = get_microtime();
- if ($unbuffered)
- $this->query_result = @sqlite_unbuffered_query($this->link_id, $sql);
- else
- $this->query_result = @sqlite_query($this->link_id, $sql);
- if ($this->query_result)
- {
- if (defined('PUN_SHOW_QUERIES'))
- $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start));
- ++$this->num_queries;
- return $this->query_result;
- }
- else
- {
- if (defined('PUN_SHOW_QUERIES'))
- $this->saved_queries[] = array($sql, 0);
- $this->error_no = @sqlite_last_error($this->link_id);
- $this->error_msg = @sqlite_error_string($this->error_no);
- if ($this->in_transaction)
- @sqlite_query($this->link_id, 'ROLLBACK');
- --$this->in_transaction;
- return false;
- }
- }
- function result($query_id = 0, $row = 0, $col = 0)
- {
- if ($query_id)
- {
- if ($row !== 0 && @sqlite_seek($query_id, $row) === false)
- return false;
- $cur_row = @sqlite_current($query_id);
- if ($cur_row === false)
- return false;
- return $cur_row[$col];
- }
- else
- return false;
- }
- function fetch_assoc($query_id = 0)
- {
- if ($query_id)
- {
- $cur_row = @sqlite_fetch_array($query_id, SQLITE_ASSOC);
- if ($cur_row)
- {
- // Horrible hack to get rid of table names and table aliases from the array keys
- foreach ($cur_row as $key => $value)
- {
- $dot_spot = strpos($key, '.');
- if ($dot_spot !== false)
- {
- unset($cur_row[$key]);
- $key = substr($key, $dot_spot+1);
- $cur_row[$key] = $value;
- }
- }
- }
- return $cur_row;
- }
- else
- return false;
- }
- function fetch_row($query_id = 0)
- {
- return ($query_id) ? @sqlite_fetch_array($query_id, SQLITE_NUM) : false;
- }
- function num_rows($query_id = 0)
- {
- return ($query_id) ? @sqlite_num_rows($query_id) : false;
- }
- function affected_rows()
- {
- return ($this->link_id) ? @sqlite_changes($this->link_id) : false;
- }
- function insert_id()
- {
- return ($this->link_id) ? @sqlite_last_insert_rowid($this->link_id) : false;
- }
- function get_num_queries()
- {
- return $this->num_queries;
- }
- function get_saved_queries()
- {
- return $this->saved_queries;
- }
- function free_result($query_id = false)
- {
- return true;
- }
- function escape($str)
- {
- return is_array($str) ? '' : sqlite_escape_string($str);
- }
- function error()
- {
- $result['error_sql'] = @current(@end($this->saved_queries));
- $result['error_no'] = $this->error_no;
- $result['error_msg'] = $this->error_msg;
- return $result;
- }
- function close()
- {
- if ($this->link_id)
- {
- if ($this->in_transaction)
- {
- if (defined('PUN_SHOW_QUERIES'))
- $this->saved_queries[] = array('COMMIT', 0);
- @sqlite_query($this->link_id, 'COMMIT');
- }
- return @sqlite_close($this->link_id);
- }
- else
- return false;
- }
- function get_names()
- {
- return '';
- }
- function set_names($names)
- {
- return true;
- }
- function get_version()
- {
- return array(
- 'name' => 'SQLite',
- 'version' => sqlite_libversion()
- );
- }
- function table_exists($table_name, $no_prefix = false)
- {
- $result = $this->query('SELECT 1 FROM sqlite_master WHERE name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND type=\'table\'');
- return $this->num_rows($result) > 0;
- }
- function field_exists($table_name, $field_name, $no_prefix = false)
- {
- $result = $this->query('SELECT sql FROM sqlite_master WHERE name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND type=\'table\'');
- if (!$this->num_rows($result))
- return false;
- return preg_match('%[\r\n]'.preg_quote($field_name, '%').' %', $this->result($result));
- }
- function index_exists($table_name, $index_name, $no_prefix = false)
- {
- $result = $this->query('SELECT 1 FROM sqlite_master WHERE tbl_name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_'.$this->escape($index_name).'\' AND type=\'index\'');
- return $this->num_rows($result) > 0;
- }
- function create_table($table_name, $schema, $no_prefix = false)
- {
- if ($this->table_exists($table_name, $no_prefix))
- return true;
- $query = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$table_name." (\n";
- // Go through every schema element and add it to the query
- foreach ($schema['FIELDS'] as $field_name => $field_data)
- {
- $field_data['datatype'] = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_data['datatype']);
- $query .= $field_name.' '.$field_data['datatype'];
- if (!$field_data['allow_null'])
- $query .= ' NOT NULL';
- if (isset($field_data['default']))
- $query .= ' DEFAULT '.$field_data['default'];
- $query .= ",\n";
- }
- // If we have a primary key, add it
- if (isset($schema['PRIMARY KEY']))
- $query .= 'PRIMARY KEY ('.implode(',', $schema['PRIMARY KEY']).'),'."\n";
- // Add unique keys
- if (isset($schema['UNIQUE KEYS']))
- {
- foreach ($schema['UNIQUE KEYS'] as $key_name => $key_fields)
- $query .= 'UNIQUE ('.implode(',', $key_fields).'),'."\n";
- }
- // We remove the last two characters (a newline and a comma) and add on the ending
- $query = substr($query, 0, strlen($query) - 2)."\n".')';
- $result = $this->query($query) ? true : false;
- // Add indexes
- if (isset($schema['INDEXES']))
- {
- foreach ($schema['INDEXES'] as $index_name => $index_fields)
- $result &= $this->add_index($table_name, $index_name, $index_fields, false, $no_prefix);
- }
- return $result;
- }
- function drop_table($table_name, $no_prefix = false)
- {
- if (!$this->table_exists($table_name, $no_prefix))
- return true;
- return $this->query('DROP TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name)) ? true : false;
- }
- function rename_table($old_table, $new_table, $no_prefix = false)
- {
- // If the old table does not exist
- if (!$this->table_exists($old_table, $no_prefix))
- return false;
- // If the table names are the same
- else if ($old_table == $new_table)
- return true;
- // If the new table already exists
- else if ($this->table_exists($new_table, $no_prefix))
- return false;
- $table = $this->get_table_info($old_table, $no_prefix);
- // Create new table
- $query = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($old_table).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($new_table).' (', $table['sql']);
- $result = $this->query($query) ? true : false;
- // Recreate indexes
- if (!empty($table['indices']))
- {
- foreach ($table['indices'] as $cur_index)
- {
- $query = str_replace('CREATE INDEX '.($no_prefix ? '' : $this->prefix).$this->escape($old_table), 'CREATE INDEX '.($no_prefix ? '' : $this->prefix).$this->escape($new_table), $cur_index);
- $query = str_replace('ON '.($no_prefix ? '' : $this->prefix).$this->escape($old_table), 'ON '.($no_prefix ? '' : $this->prefix).$this->escape($new_table), $query);
- $result &= $this->query($query) ? true : false;
- }
- }
- // Copy content across
- $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($new_table).' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($old_table)) ? true : false;
- // Drop the old table if the new one exists
- if ($this->table_exists($new_table, $no_prefix))
- $result &= $this->drop_table($old_table, $no_prefix);
- return $result;
- }
- function get_table_info($table_name, $no_prefix = false)
- {
- // Grab table info
- $result = $this->query('SELECT sql FROM sqlite_master WHERE tbl_name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' ORDER BY type DESC') or error('Unable to fetch table information', __FILE__, __LINE__, $this->error());
- $num_rows = $this->num_rows($result);
- if ($num_rows == 0)
- return;
- $table = array();
- $table['indices'] = array();
- while ($cur_index = $this->fetch_assoc($result))
- {
- if (empty($cur_index['sql']))
- continue;
- if (!isset($table['sql']))
- $table['sql'] = $cur_index['sql'];
- else
- $table['indices'][] = $cur_index['sql'];
- }
- // Work out the columns in the table currently
- $table_lines = explode("\n", $table['sql']);
- $table['columns'] = array();
- foreach ($table_lines as $table_line)
- {
- $table_line = trim($table_line, " \t\n\r,"); // trim spaces, tabs, newlines, and commas
- if (substr($table_line, 0, 12) == 'CREATE TABLE')
- continue;
- else if (substr($table_line, 0, 11) == 'PRIMARY KEY')
- $table['primary_key'] = $table_line;
- else if (substr($table_line, 0, 6) == 'UNIQUE')
- $table['unique'] = $table_line;
- else if (substr($table_line, 0, strpos($table_line, ' ')) != '')
- $table['columns'][substr($table_line, 0, strpos($table_line, ' '))] = trim(substr($table_line, strpos($table_line, ' ')));
- }
- return $table;
- }
- function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null, $no_prefix = false)
- {
- if ($this->field_exists($table_name, $field_name, $no_prefix))
- return true;
- $table = $this->get_table_info($table_name, $no_prefix);
- // Create temp table
- $now = time();
- $tmptable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' (', $table['sql']);
- $result = $this->query($tmptable) ? true : false;
- $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name)) ? true : false;
- // Create new table sql
- $field_type = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_type);
- $query = $field_type;
- if (!$allow_null)
- $query .= ' NOT NULL';
-
- if ($default_value === '')
- $default_value = '\'\'';
- if (!is_null($default_value))
- $query .= ' DEFAULT '.$default_value;
- $old_columns = array_keys($table['columns']);
- // Determine the proper offset
- if (!is_null($after_field))
- $offset = array_search($after_field, array_keys($table['columns']), true) + 1;
- else
- $offset = count($table['columns']);
- // Out of bounds checks
- if ($offset > count($table['columns']))
- $offset = count($table['columns']);
- else if ($offset < 0)
- $offset = 0;
- if (!is_null($field_name) && $field_name !== '')
- $table['columns'] = array_merge(array_slice($table['columns'], 0, $offset), array($field_name => $query), array_slice($table['columns'], $offset));
- $new_table = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (';
- foreach ($table['columns'] as $cur_column => $column_details)
- $new_table .= "\n".$cur_column.' '.$column_details.',';
- if (isset($table['unique']))
- $new_table .= "\n".$table['unique'].',';
- if (isset($table['primary_key']))
- $new_table .= "\n".$table['primary_key'].',';
- $new_table = trim($new_table, ',')."\n".');';
- // Drop old table
- $result &= $this->drop_table($table_name, $no_prefix);
- // Create new table
- $result &= $this->query($new_table) ? true : false;
- // Recreate indexes
- if (!empty($table['indices']))
- {
- foreach ($table['indices'] as $cur_index)
- $result &= $this->query($cur_index) ? true : false;
- }
- // Copy content back
- $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' ('.implode(', ', $old_columns).') SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now) ? true : false;
- // Drop temp table
- $result &= $this->drop_table($table_name.'_t'.$now, $no_prefix);
- return $result;
- }
- function alter_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null, $no_prefix = false)
- {
- // Unneeded for SQLite
- return true;
- }
- function drop_field($table_name, $field_name, $no_prefix = false)
- {
- if (!$this->field_exists($table_name, $field_name, $no_prefix))
- return true;
- $table = $this->get_table_info($table_name, $no_prefix);
- // Create temp table
- $now = time();
- $tmptable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' (', $table['sql']);
- $result = $this->query($tmptable) ? true : false;
- $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name)) ? true : false;
- // Work out the columns we need to keep and the sql for the new table
- unset($table['columns'][$field_name]);
- $new_columns = array_keys($table['columns']);
- $new_table = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (';
- foreach ($table['columns'] as $cur_column => $column_details)
- $new_table .= "\n".$cur_column.' '.$column_details.',';
- if (isset($table['unique']))
- $new_table .= "\n".$table['unique'].',';
- if (isset($table['primary_key']))
- $new_table .= "\n".$table['primary_key'].',';
- $new_table = trim($new_table, ',')."\n".');';
- // Drop old table
- $result &= $this->drop_table($table_name, $no_prefix);
- // Create new table
- $result &= $this->query($new_table) ? true : false;
- // Recreate indexes
- if (!empty($table['indices']))
- {
- foreach ($table['indices'] as $cur_index)
- if (!preg_match('%\('.preg_quote($field_name, '%').'\)%', $cur_index))
- $result &= $this->query($cur_index) ? true : false;
- }
- // Copy content back
- $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' SELECT '.implode(', ', $new_columns).' FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now) ? true : false;
- // Drop temp table
- $result &= $this->drop_table($table_name.'_t'.$now, $no_prefix);
- return $result;
- }
- function add_index($table_name, $index_name, $index_fields, $unique = false, $no_prefix = false)
- {
- if ($this->index_exists($table_name, $index_name, $no_prefix))
- return true;
- return $this->query('CREATE '.($unique ? 'UNIQUE ' : '').'INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name.' ON '.($no_prefix ? '' : $this->prefix).$table_name.'('.implode(',', $index_fields).')') ? true : false;
- }
- function drop_index($table_name, $index_name, $no_prefix = false)
- {
- if (!$this->index_exists($table_name, $index_name, $no_prefix))
- return true;
- return $this->query('DROP INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name) ? true : false;
- }
- function truncate_table($table_name, $no_prefix = false)
- {
- return $this->query('DELETE FROM '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false;
- }
- }