[780] | 1 | <?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); |
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| 2 | /** |
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| 3 | * CodeIgniter |
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| 4 | * |
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| 5 | * An open source application development framework for PHP 5.1.6 or newer |
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| 6 | * |
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| 7 | * @package CodeIgniter |
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| 8 | * @author ExpressionEngine Dev Team |
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| 9 | * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. |
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| 10 | * @license http://codeigniter.com/user_guide/license.html |
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| 11 | * @link http://codeigniter.com |
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| 12 | * @since Version 1.0 |
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| 13 | * @filesource |
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| 14 | */ |
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| 15 | |
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| 16 | // ------------------------------------------------------------------------ |
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| 17 | |
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| 18 | |
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| 19 | |
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| 20 | /** |
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| 21 | * SQLite Database Adapter Class |
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| 22 | * |
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| 23 | * Note: _DB is an extender class that the app controller |
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| 24 | * creates dynamically based on whether the active record |
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| 25 | * class is being used or not. |
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| 26 | * |
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| 27 | * @package CodeIgniter |
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| 28 | * @subpackage Drivers |
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| 29 | * @category Database |
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| 30 | * @author ExpressionEngine Dev Team |
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| 31 | * @link http://codeigniter.com/user_guide/database/ |
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| 32 | */ |
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| 33 | class CI_DB_sqlite_driver extends CI_DB { |
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| 34 | |
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| 35 | var $dbdriver = 'sqlite'; |
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| 36 | |
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| 37 | // The character used to escape with - not needed for SQLite |
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| 38 | var $_escape_char = ''; |
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| 39 | |
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| 40 | // clause and character used for LIKE escape sequences |
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| 41 | var $_like_escape_str = " ESCAPE '%s' "; |
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| 42 | var $_like_escape_chr = '!'; |
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| 43 | |
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| 44 | /** |
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| 45 | * The syntax to count rows is slightly different across different |
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| 46 | * database engines, so this string appears in each driver and is |
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| 47 | * used for the count_all() and count_all_results() functions. |
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| 48 | */ |
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| 49 | var $_count_string = "SELECT COUNT(*) AS "; |
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| 50 | var $_random_keyword = ' Random()'; // database specific random keyword |
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| 51 | |
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| 52 | /** |
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| 53 | * Non-persistent database connection |
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| 54 | * |
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| 55 | * @access private called by the base class |
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| 56 | * @return resource |
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| 57 | */ |
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| 58 | function db_connect() |
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| 59 | { |
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| 60 | if ( ! $conn_id = @sqlite_open($this->database, FILE_WRITE_MODE, $error)) |
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| 61 | { |
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| 62 | log_message('error', $error); |
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| 63 | |
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| 64 | if ($this->db_debug) |
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| 65 | { |
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| 66 | $this->display_error($error, '', TRUE); |
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| 67 | } |
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| 68 | |
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| 69 | return FALSE; |
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| 70 | } |
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| 71 | |
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| 72 | return $conn_id; |
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| 73 | } |
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| 74 | |
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| 75 | // -------------------------------------------------------------------- |
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| 76 | |
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| 77 | /** |
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| 78 | * Persistent database connection |
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| 79 | * |
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| 80 | * @access private called by the base class |
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| 81 | * @return resource |
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| 82 | */ |
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| 83 | function db_pconnect() |
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| 84 | { |
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| 85 | if ( ! $conn_id = @sqlite_popen($this->database, FILE_WRITE_MODE, $error)) |
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| 86 | { |
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| 87 | log_message('error', $error); |
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| 88 | |
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| 89 | if ($this->db_debug) |
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| 90 | { |
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| 91 | $this->display_error($error, '', TRUE); |
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| 92 | } |
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| 93 | |
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| 94 | return FALSE; |
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| 95 | } |
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| 96 | |
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| 97 | return $conn_id; |
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| 98 | } |
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| 99 | |
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| 100 | // -------------------------------------------------------------------- |
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| 101 | |
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| 102 | /** |
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| 103 | * Reconnect |
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| 104 | * |
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| 105 | * Keep / reestablish the db connection if no queries have been |
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| 106 | * sent for a length of time exceeding the server's idle timeout |
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| 107 | * |
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| 108 | * @access public |
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| 109 | * @return void |
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| 110 | */ |
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| 111 | function reconnect() |
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| 112 | { |
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| 113 | // not implemented in SQLite |
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| 114 | } |
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| 115 | |
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| 116 | // -------------------------------------------------------------------- |
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| 117 | |
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| 118 | /** |
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| 119 | * Select the database |
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| 120 | * |
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| 121 | * @access private called by the base class |
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| 122 | * @return resource |
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| 123 | */ |
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| 124 | function db_select() |
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| 125 | { |
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| 126 | return TRUE; |
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| 127 | } |
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| 128 | |
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| 129 | // -------------------------------------------------------------------- |
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| 130 | |
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| 131 | /** |
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| 132 | * Set client character set |
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| 133 | * |
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| 134 | * @access public |
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| 135 | * @param string |
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| 136 | * @param string |
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| 137 | * @return resource |
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| 138 | */ |
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| 139 | function db_set_charset($charset, $collation) |
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| 140 | { |
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| 141 | // @todo - add support if needed |
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| 142 | return TRUE; |
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| 143 | } |
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| 144 | |
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| 145 | // -------------------------------------------------------------------- |
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| 146 | |
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| 147 | /** |
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| 148 | * Version number query string |
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| 149 | * |
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| 150 | * @access public |
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| 151 | * @return string |
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| 152 | */ |
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| 153 | function _version() |
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| 154 | { |
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| 155 | return sqlite_libversion(); |
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| 156 | } |
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| 157 | |
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| 158 | // -------------------------------------------------------------------- |
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| 159 | |
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| 160 | /** |
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| 161 | * Execute the query |
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| 162 | * |
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| 163 | * @access private called by the base class |
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| 164 | * @param string an SQL query |
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| 165 | * @return resource |
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| 166 | */ |
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| 167 | function _execute($sql) |
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| 168 | { |
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| 169 | $sql = $this->_prep_query($sql); |
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| 170 | return @sqlite_query($this->conn_id, $sql); |
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| 171 | } |
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| 172 | |
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| 173 | // -------------------------------------------------------------------- |
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| 174 | |
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| 175 | /** |
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| 176 | * Prep the query |
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| 177 | * |
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| 178 | * If needed, each database adapter can prep the query string |
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| 179 | * |
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| 180 | * @access private called by execute() |
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| 181 | * @param string an SQL query |
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| 182 | * @return string |
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| 183 | */ |
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| 184 | function _prep_query($sql) |
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| 185 | { |
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| 186 | return $sql; |
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| 187 | } |
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| 188 | |
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| 189 | // -------------------------------------------------------------------- |
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| 190 | |
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| 191 | /** |
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| 192 | * Begin Transaction |
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| 193 | * |
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| 194 | * @access public |
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| 195 | * @return bool |
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| 196 | */ |
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| 197 | function trans_begin($test_mode = FALSE) |
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| 198 | { |
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| 199 | if ( ! $this->trans_enabled) |
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| 200 | { |
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| 201 | return TRUE; |
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| 202 | } |
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| 203 | |
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| 204 | // When transactions are nested we only begin/commit/rollback the outermost ones |
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| 205 | if ($this->_trans_depth > 0) |
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| 206 | { |
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| 207 | return TRUE; |
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| 208 | } |
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| 209 | |
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| 210 | // Reset the transaction failure flag. |
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| 211 | // If the $test_mode flag is set to TRUE transactions will be rolled back |
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| 212 | // even if the queries produce a successful result. |
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| 213 | $this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE; |
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| 214 | |
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| 215 | $this->simple_query('BEGIN TRANSACTION'); |
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| 216 | return TRUE; |
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| 217 | } |
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| 218 | |
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| 219 | // -------------------------------------------------------------------- |
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| 220 | |
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| 221 | /** |
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| 222 | * Commit Transaction |
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| 223 | * |
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| 224 | * @access public |
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| 225 | * @return bool |
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| 226 | */ |
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| 227 | function trans_commit() |
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| 228 | { |
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| 229 | if ( ! $this->trans_enabled) |
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| 230 | { |
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| 231 | return TRUE; |
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| 232 | } |
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| 233 | |
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| 234 | // When transactions are nested we only begin/commit/rollback the outermost ones |
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| 235 | if ($this->_trans_depth > 0) |
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| 236 | { |
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| 237 | return TRUE; |
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| 238 | } |
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| 239 | |
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| 240 | $this->simple_query('COMMIT'); |
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| 241 | return TRUE; |
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| 242 | } |
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| 243 | |
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| 244 | // -------------------------------------------------------------------- |
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| 245 | |
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| 246 | /** |
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| 247 | * Rollback Transaction |
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| 248 | * |
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| 249 | * @access public |
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| 250 | * @return bool |
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| 251 | */ |
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| 252 | function trans_rollback() |
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| 253 | { |
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| 254 | if ( ! $this->trans_enabled) |
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| 255 | { |
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| 256 | return TRUE; |
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| 257 | } |
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| 258 | |
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| 259 | // When transactions are nested we only begin/commit/rollback the outermost ones |
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| 260 | if ($this->_trans_depth > 0) |
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| 261 | { |
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| 262 | return TRUE; |
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| 263 | } |
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| 264 | |
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| 265 | $this->simple_query('ROLLBACK'); |
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| 266 | return TRUE; |
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| 267 | } |
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| 268 | |
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| 269 | // -------------------------------------------------------------------- |
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| 270 | |
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| 271 | /** |
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| 272 | * Escape String |
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| 273 | * |
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| 274 | * @access public |
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| 275 | * @param string |
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| 276 | * @param bool whether or not the string will be used in a LIKE condition |
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| 277 | * @return string |
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| 278 | */ |
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| 279 | function escape_str($str, $like = FALSE) |
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| 280 | { |
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| 281 | if (is_array($str)) |
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| 282 | { |
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| 283 | foreach ($str as $key => $val) |
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| 284 | { |
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| 285 | $str[$key] = $this->escape_str($val, $like); |
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| 286 | } |
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| 287 | |
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| 288 | return $str; |
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| 289 | } |
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| 290 | |
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| 291 | $str = sqlite_escape_string($str); |
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| 292 | |
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| 293 | // escape LIKE condition wildcards |
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| 294 | if ($like === TRUE) |
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| 295 | { |
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| 296 | $str = str_replace( array('%', '_', $this->_like_escape_chr), |
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| 297 | array($this->_like_escape_chr.'%', $this->_like_escape_chr.'_', $this->_like_escape_chr.$this->_like_escape_chr), |
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| 298 | $str); |
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| 299 | } |
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| 300 | |
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| 301 | return $str; |
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| 302 | } |
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| 303 | |
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| 304 | // -------------------------------------------------------------------- |
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| 305 | |
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| 306 | /** |
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| 307 | * Affected Rows |
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| 308 | * |
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| 309 | * @access public |
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| 310 | * @return integer |
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| 311 | */ |
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| 312 | function affected_rows() |
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| 313 | { |
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| 314 | return sqlite_changes($this->conn_id); |
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| 315 | } |
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| 316 | |
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| 317 | // -------------------------------------------------------------------- |
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| 318 | |
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| 319 | /** |
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| 320 | * Insert ID |
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| 321 | * |
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| 322 | * @access public |
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| 323 | * @return integer |
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| 324 | */ |
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| 325 | function insert_id() |
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| 326 | { |
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| 327 | return @sqlite_last_insert_rowid($this->conn_id); |
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| 328 | } |
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| 329 | |
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| 330 | // -------------------------------------------------------------------- |
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| 331 | |
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| 332 | /** |
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| 333 | * "Count All" query |
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| 334 | * |
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| 335 | * Generates a platform-specific query string that counts all records in |
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| 336 | * the specified database |
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| 337 | * |
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| 338 | * @access public |
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| 339 | * @param string |
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| 340 | * @return string |
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| 341 | */ |
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| 342 | function count_all($table = '') |
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| 343 | { |
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| 344 | if ($table == '') |
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| 345 | { |
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| 346 | return 0; |
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| 347 | } |
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| 348 | |
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| 349 | $query = $this->query($this->_count_string . $this->_protect_identifiers('numrows') . " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE)); |
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| 350 | |
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| 351 | if ($query->num_rows() == 0) |
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| 352 | { |
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| 353 | return 0; |
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| 354 | } |
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| 355 | |
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| 356 | $row = $query->row(); |
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| 357 | $this->_reset_select(); |
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| 358 | return (int) $row->numrows; |
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| 359 | } |
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| 360 | |
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| 361 | // -------------------------------------------------------------------- |
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| 362 | |
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| 363 | /** |
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| 364 | * List table query |
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| 365 | * |
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| 366 | * Generates a platform-specific query string so that the table names can be fetched |
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| 367 | * |
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| 368 | * @access private |
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| 369 | * @param boolean |
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| 370 | * @return string |
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| 371 | */ |
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| 372 | function _list_tables($prefix_limit = FALSE) |
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| 373 | { |
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| 374 | $sql = "SELECT name from sqlite_master WHERE type='table'"; |
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| 375 | |
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| 376 | if ($prefix_limit !== FALSE AND $this->dbprefix != '') |
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| 377 | { |
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| 378 | $sql .= " AND 'name' LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr); |
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| 379 | } |
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| 380 | return $sql; |
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| 381 | } |
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| 382 | |
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| 383 | // -------------------------------------------------------------------- |
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| 384 | |
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| 385 | /** |
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| 386 | * Show column query |
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| 387 | * |
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| 388 | * Generates a platform-specific query string so that the column names can be fetched |
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| 389 | * |
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| 390 | * @access public |
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| 391 | * @param string the table name |
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| 392 | * @return string |
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| 393 | */ |
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| 394 | function _list_columns($table = '') |
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| 395 | { |
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| 396 | // Not supported |
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| 397 | return FALSE; |
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| 398 | } |
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| 399 | |
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| 400 | // -------------------------------------------------------------------- |
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| 401 | |
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| 402 | /** |
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| 403 | * Field data query |
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| 404 | * |
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| 405 | * Generates a platform-specific query so that the column data can be retrieved |
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| 406 | * |
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| 407 | * @access public |
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| 408 | * @param string the table name |
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| 409 | * @return object |
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| 410 | */ |
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| 411 | function _field_data($table) |
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| 412 | { |
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| 413 | return "SELECT * FROM ".$table." LIMIT 1"; |
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| 414 | } |
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| 415 | |
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| 416 | // -------------------------------------------------------------------- |
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| 417 | |
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| 418 | /** |
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| 419 | * The error message string |
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| 420 | * |
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| 421 | * @access private |
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| 422 | * @return string |
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| 423 | */ |
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| 424 | function _error_message() |
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| 425 | { |
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| 426 | return sqlite_error_string(sqlite_last_error($this->conn_id)); |
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| 427 | } |
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| 428 | |
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| 429 | // -------------------------------------------------------------------- |
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| 430 | |
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| 431 | /** |
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| 432 | * The error message number |
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| 433 | * |
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| 434 | * @access private |
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| 435 | * @return integer |
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| 436 | */ |
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| 437 | function _error_number() |
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| 438 | { |
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| 439 | return sqlite_last_error($this->conn_id); |
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| 440 | } |
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| 441 | |
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| 442 | // -------------------------------------------------------------------- |
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| 443 | |
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| 444 | /** |
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| 445 | * Escape the SQL Identifiers |
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| 446 | * |
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| 447 | * This function escapes column and table names |
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| 448 | * |
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| 449 | * @access private |
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| 450 | * @param string |
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| 451 | * @return string |
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| 452 | */ |
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| 453 | function _escape_identifiers($item) |
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| 454 | { |
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| 455 | if ($this->_escape_char == '') |
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| 456 | { |
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| 457 | return $item; |
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| 458 | } |
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| 459 | |
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| 460 | foreach ($this->_reserved_identifiers as $id) |
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| 461 | { |
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| 462 | if (strpos($item, '.'.$id) !== FALSE) |
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| 463 | { |
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| 464 | $str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item); |
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| 465 | |
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| 466 | // remove duplicates if the user already included the escape |
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| 467 | return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str); |
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| 468 | } |
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| 469 | } |
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| 470 | |
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| 471 | if (strpos($item, '.') !== FALSE) |
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| 472 | { |
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| 473 | $str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char; |
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| 474 | } |
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| 475 | else |
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| 476 | { |
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| 477 | $str = $this->_escape_char.$item.$this->_escape_char; |
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| 478 | } |
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| 479 | |
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| 480 | // remove duplicates if the user already included the escape |
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| 481 | return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str); |
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| 482 | } |
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| 483 | |
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| 484 | // -------------------------------------------------------------------- |
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| 485 | |
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| 486 | /** |
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| 487 | * From Tables |
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| 488 | * |
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| 489 | * This function implicitly groups FROM tables so there is no confusion |
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| 490 | * about operator precedence in harmony with SQL standards |
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| 491 | * |
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| 492 | * @access public |
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| 493 | * @param type |
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| 494 | * @return type |
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| 495 | */ |
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| 496 | function _from_tables($tables) |
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| 497 | { |
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| 498 | if ( ! is_array($tables)) |
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| 499 | { |
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| 500 | $tables = array($tables); |
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| 501 | } |
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| 502 | |
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| 503 | return '('.implode(', ', $tables).')'; |
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| 504 | } |
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| 505 | |
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| 506 | // -------------------------------------------------------------------- |
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| 507 | |
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| 508 | /** |
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| 509 | * Insert statement |
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| 510 | * |
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| 511 | * Generates a platform-specific insert string from the supplied data |
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| 512 | * |
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| 513 | * @access public |
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| 514 | * @param string the table name |
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| 515 | * @param array the insert keys |
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| 516 | * @param array the insert values |
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| 517 | * @return string |
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| 518 | */ |
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| 519 | function _insert($table, $keys, $values) |
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| 520 | { |
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| 521 | return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")"; |
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| 522 | } |
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| 523 | |
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| 524 | // -------------------------------------------------------------------- |
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| 525 | |
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| 526 | /** |
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| 527 | * Update statement |
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| 528 | * |
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| 529 | * Generates a platform-specific update string from the supplied data |
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| 530 | * |
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| 531 | * @access public |
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| 532 | * @param string the table name |
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| 533 | * @param array the update data |
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| 534 | * @param array the where clause |
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| 535 | * @param array the orderby clause |
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| 536 | * @param array the limit clause |
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| 537 | * @return string |
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| 538 | */ |
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| 539 | function _update($table, $values, $where, $orderby = array(), $limit = FALSE) |
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| 540 | { |
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| 541 | foreach ($values as $key => $val) |
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| 542 | { |
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| 543 | $valstr[] = $key." = ".$val; |
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| 544 | } |
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| 545 | |
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| 546 | $limit = ( ! $limit) ? '' : ' LIMIT '.$limit; |
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| 547 | |
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| 548 | $orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):''; |
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| 549 | |
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| 550 | $sql = "UPDATE ".$table." SET ".implode(', ', $valstr); |
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| 551 | |
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| 552 | $sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : ''; |
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| 553 | |
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| 554 | $sql .= $orderby.$limit; |
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| 555 | |
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| 556 | return $sql; |
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| 557 | } |
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| 558 | |
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| 559 | |
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| 560 | // -------------------------------------------------------------------- |
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| 561 | |
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| 562 | /** |
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| 563 | * Truncate statement |
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| 564 | * |
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| 565 | * Generates a platform-specific truncate string from the supplied data |
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| 566 | * If the database does not support the truncate() command |
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| 567 | * This function maps to "DELETE FROM table" |
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| 568 | * |
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| 569 | * @access public |
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| 570 | * @param string the table name |
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| 571 | * @return string |
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| 572 | */ |
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| 573 | function _truncate($table) |
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| 574 | { |
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| 575 | return $this->_delete($table); |
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| 576 | } |
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| 577 | |
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| 578 | // -------------------------------------------------------------------- |
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| 579 | |
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| 580 | /** |
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| 581 | * Delete statement |
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| 582 | * |
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| 583 | * Generates a platform-specific delete string from the supplied data |
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| 584 | * |
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| 585 | * @access public |
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| 586 | * @param string the table name |
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| 587 | * @param array the where clause |
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| 588 | * @param string the limit clause |
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| 589 | * @return string |
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| 590 | */ |
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| 591 | function _delete($table, $where = array(), $like = array(), $limit = FALSE) |
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| 592 | { |
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| 593 | $conditions = ''; |
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| 594 | |
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| 595 | if (count($where) > 0 OR count($like) > 0) |
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| 596 | { |
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| 597 | $conditions = "\nWHERE "; |
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| 598 | $conditions .= implode("\n", $this->ar_where); |
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| 599 | |
---|
| 600 | if (count($where) > 0 && count($like) > 0) |
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| 601 | { |
---|
| 602 | $conditions .= " AND "; |
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| 603 | } |
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| 604 | $conditions .= implode("\n", $like); |
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| 605 | } |
---|
| 606 | |
---|
| 607 | $limit = ( ! $limit) ? '' : ' LIMIT '.$limit; |
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| 608 | |
---|
| 609 | return "DELETE FROM ".$table.$conditions.$limit; |
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| 610 | } |
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| 611 | |
---|
| 612 | // -------------------------------------------------------------------- |
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| 613 | |
---|
| 614 | /** |
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| 615 | * Limit string |
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| 616 | * |
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| 617 | * Generates a platform-specific LIMIT clause |
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| 618 | * |
---|
| 619 | * @access public |
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| 620 | * @param string the sql query string |
---|
| 621 | * @param integer the number of rows to limit the query to |
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| 622 | * @param integer the offset value |
---|
| 623 | * @return string |
---|
| 624 | */ |
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| 625 | function _limit($sql, $limit, $offset) |
---|
| 626 | { |
---|
| 627 | if ($offset == 0) |
---|
| 628 | { |
---|
| 629 | $offset = ''; |
---|
| 630 | } |
---|
| 631 | else |
---|
| 632 | { |
---|
| 633 | $offset .= ", "; |
---|
| 634 | } |
---|
| 635 | |
---|
| 636 | return $sql."LIMIT ".$offset.$limit; |
---|
| 637 | } |
---|
| 638 | |
---|
| 639 | // -------------------------------------------------------------------- |
---|
| 640 | |
---|
| 641 | /** |
---|
| 642 | * Close DB Connection |
---|
| 643 | * |
---|
| 644 | * @access public |
---|
| 645 | * @param resource |
---|
| 646 | * @return void |
---|
| 647 | */ |
---|
| 648 | function _close($conn_id) |
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| 649 | { |
---|
| 650 | @sqlite_close($conn_id); |
---|
| 651 | } |
---|
| 652 | |
---|
| 653 | |
---|
| 654 | } |
---|
| 655 | |
---|
| 656 | |
---|
| 657 | /* End of file sqlite_driver.php */ |
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| 658 | /* Location: ./system/database/drivers/sqlite/sqlite_driver.php */ |
---|