1 | <?php |
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2 | |
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3 | /** |
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4 | * Copyright (C) 2008-2011 FluxBB |
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5 | * based on code by Rickard Andersson copyright (C) 2002-2008 PunBB |
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6 | * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher |
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7 | */ |
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8 | |
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9 | // Make sure we have built in support for SQLite |
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10 | if (!function_exists('sqlite_open')) |
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11 | 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.'); |
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12 | |
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13 | |
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14 | class DBLayer |
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15 | { |
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16 | var $prefix; |
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17 | var $link_id; |
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18 | var $query_result; |
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19 | var $in_transaction = 0; |
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20 | |
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21 | var $saved_queries = array(); |
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22 | var $num_queries = 0; |
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23 | |
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24 | var $error_no = false; |
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25 | var $error_msg = 'Unknown'; |
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26 | |
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27 | var $datatype_transformations = array( |
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28 | '%^SERIAL$%' => 'INTEGER', |
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29 | '%^(TINY|SMALL|MEDIUM|BIG)?INT( )?(\\([0-9]+\\))?( )?(UNSIGNED)?$%i' => 'INTEGER', |
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30 | '%^(TINY|MEDIUM|LONG)?TEXT$%i' => 'TEXT' |
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31 | ); |
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32 | |
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33 | |
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34 | function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect) |
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35 | { |
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36 | // Prepend $db_name with the path to the forum root directory |
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37 | $db_name = PUN_ROOT.$db_name; |
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38 | |
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39 | $this->prefix = $db_prefix; |
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40 | |
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41 | if (!file_exists($db_name)) |
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42 | { |
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43 | @touch($db_name); |
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44 | @chmod($db_name, 0666); |
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45 | if (!file_exists($db_name)) |
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46 | error('Unable to create new database \''.$db_name.'\'. Permission denied', __FILE__, __LINE__); |
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47 | } |
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48 | |
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49 | if (!is_readable($db_name)) |
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50 | error('Unable to open database \''.$db_name.'\' for reading. Permission denied', __FILE__, __LINE__); |
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51 | |
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52 | if (!is_writable($db_name)) |
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53 | error('Unable to open database \''.$db_name.'\' for writing. Permission denied', __FILE__, __LINE__); |
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54 | |
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55 | if ($p_connect) |
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56 | $this->link_id = @sqlite_popen($db_name, 0666, $sqlite_error); |
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57 | else |
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58 | $this->link_id = @sqlite_open($db_name, 0666, $sqlite_error); |
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59 | |
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60 | if (!$this->link_id) |
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61 | error('Unable to open database \''.$db_name.'\'. SQLite reported: '.$sqlite_error, __FILE__, __LINE__); |
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62 | else |
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63 | return $this->link_id; |
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64 | } |
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65 | |
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66 | |
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67 | function start_transaction() |
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68 | { |
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69 | ++$this->in_transaction; |
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70 | |
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71 | return (@sqlite_query($this->link_id, 'BEGIN')) ? true : false; |
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72 | } |
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73 | |
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74 | |
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75 | function end_transaction() |
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76 | { |
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77 | --$this->in_transaction; |
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78 | |
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79 | if (@sqlite_query($this->link_id, 'COMMIT')) |
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80 | return true; |
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81 | else |
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82 | { |
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83 | @sqlite_query($this->link_id, 'ROLLBACK'); |
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84 | return false; |
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85 | } |
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86 | } |
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87 | |
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88 | |
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89 | function query($sql, $unbuffered = false) |
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90 | { |
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91 | if (defined('PUN_SHOW_QUERIES')) |
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92 | $q_start = get_microtime(); |
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93 | |
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94 | if ($unbuffered) |
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95 | $this->query_result = @sqlite_unbuffered_query($this->link_id, $sql); |
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96 | else |
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97 | $this->query_result = @sqlite_query($this->link_id, $sql); |
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98 | |
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99 | if ($this->query_result) |
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100 | { |
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101 | if (defined('PUN_SHOW_QUERIES')) |
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102 | $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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103 | |
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104 | ++$this->num_queries; |
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105 | |
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106 | return $this->query_result; |
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107 | } |
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108 | else |
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109 | { |
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110 | if (defined('PUN_SHOW_QUERIES')) |
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111 | $this->saved_queries[] = array($sql, 0); |
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112 | |
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113 | $this->error_no = @sqlite_last_error($this->link_id); |
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114 | $this->error_msg = @sqlite_error_string($this->error_no); |
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115 | |
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116 | if ($this->in_transaction) |
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117 | @sqlite_query($this->link_id, 'ROLLBACK'); |
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118 | |
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119 | --$this->in_transaction; |
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120 | |
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121 | return false; |
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122 | } |
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123 | } |
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124 | |
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125 | |
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126 | function result($query_id = 0, $row = 0, $col = 0) |
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127 | { |
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128 | if ($query_id) |
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129 | { |
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130 | if ($row !== 0 && @sqlite_seek($query_id, $row) === false) |
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131 | return false; |
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132 | |
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133 | $cur_row = @sqlite_current($query_id); |
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134 | if ($cur_row === false) |
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135 | return false; |
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136 | |
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137 | return $cur_row[$col]; |
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138 | } |
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139 | else |
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140 | return false; |
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141 | } |
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142 | |
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143 | |
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144 | function fetch_assoc($query_id = 0) |
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145 | { |
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146 | if ($query_id) |
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147 | { |
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148 | $cur_row = @sqlite_fetch_array($query_id, SQLITE_ASSOC); |
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149 | if ($cur_row) |
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150 | { |
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151 | // Horrible hack to get rid of table names and table aliases from the array keys |
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152 | foreach ($cur_row as $key => $value) |
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153 | { |
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154 | $dot_spot = strpos($key, '.'); |
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155 | if ($dot_spot !== false) |
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156 | { |
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157 | unset($cur_row[$key]); |
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158 | $key = substr($key, $dot_spot+1); |
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159 | $cur_row[$key] = $value; |
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160 | } |
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161 | } |
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162 | } |
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163 | |
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164 | return $cur_row; |
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165 | } |
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166 | else |
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167 | return false; |
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168 | } |
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169 | |
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170 | |
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171 | function fetch_row($query_id = 0) |
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172 | { |
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173 | return ($query_id) ? @sqlite_fetch_array($query_id, SQLITE_NUM) : false; |
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174 | } |
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175 | |
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176 | |
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177 | function num_rows($query_id = 0) |
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178 | { |
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179 | return ($query_id) ? @sqlite_num_rows($query_id) : false; |
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180 | } |
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181 | |
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182 | |
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183 | function affected_rows() |
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184 | { |
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185 | return ($this->link_id) ? @sqlite_changes($this->link_id) : false; |
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186 | } |
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187 | |
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188 | |
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189 | function insert_id() |
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190 | { |
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191 | return ($this->link_id) ? @sqlite_last_insert_rowid($this->link_id) : false; |
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192 | } |
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193 | |
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194 | |
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195 | function get_num_queries() |
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196 | { |
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197 | return $this->num_queries; |
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198 | } |
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199 | |
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200 | |
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201 | function get_saved_queries() |
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202 | { |
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203 | return $this->saved_queries; |
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204 | } |
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205 | |
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206 | |
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207 | function free_result($query_id = false) |
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208 | { |
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209 | return true; |
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210 | } |
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211 | |
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212 | |
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213 | function escape($str) |
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214 | { |
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215 | return is_array($str) ? '' : sqlite_escape_string($str); |
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216 | } |
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217 | |
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218 | |
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219 | function error() |
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220 | { |
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221 | $result['error_sql'] = @current(@end($this->saved_queries)); |
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222 | $result['error_no'] = $this->error_no; |
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223 | $result['error_msg'] = $this->error_msg; |
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224 | |
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225 | return $result; |
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226 | } |
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227 | |
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228 | |
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229 | function close() |
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230 | { |
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231 | if ($this->link_id) |
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232 | { |
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233 | if ($this->in_transaction) |
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234 | { |
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235 | if (defined('PUN_SHOW_QUERIES')) |
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236 | $this->saved_queries[] = array('COMMIT', 0); |
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237 | |
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238 | @sqlite_query($this->link_id, 'COMMIT'); |
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239 | } |
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240 | |
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241 | return @sqlite_close($this->link_id); |
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242 | } |
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243 | else |
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244 | return false; |
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245 | } |
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246 | |
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247 | |
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248 | function get_names() |
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249 | { |
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250 | return ''; |
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251 | } |
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252 | |
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253 | |
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254 | function set_names($names) |
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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 | |
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260 | function get_version() |
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261 | { |
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262 | return array( |
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263 | 'name' => 'SQLite', |
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264 | 'version' => sqlite_libversion() |
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265 | ); |
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266 | } |
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267 | |
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268 | |
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269 | function table_exists($table_name, $no_prefix = false) |
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270 | { |
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271 | $result = $this->query('SELECT 1 FROM sqlite_master WHERE name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND type=\'table\''); |
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272 | return $this->num_rows($result) > 0; |
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273 | } |
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274 | |
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275 | |
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276 | function field_exists($table_name, $field_name, $no_prefix = false) |
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277 | { |
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278 | $result = $this->query('SELECT sql FROM sqlite_master WHERE name = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND type=\'table\''); |
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279 | if (!$this->num_rows($result)) |
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280 | return false; |
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281 | |
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282 | return preg_match('%[\r\n]'.preg_quote($field_name, '%').' %', $this->result($result)); |
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283 | } |
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284 | |
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285 | |
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286 | function index_exists($table_name, $index_name, $no_prefix = false) |
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287 | { |
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288 | $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\''); |
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289 | return $this->num_rows($result) > 0; |
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290 | } |
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291 | |
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292 | |
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293 | function create_table($table_name, $schema, $no_prefix = false) |
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294 | { |
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295 | if ($this->table_exists($table_name, $no_prefix)) |
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296 | return true; |
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297 | |
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298 | $query = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$table_name." (\n"; |
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299 | |
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300 | // Go through every schema element and add it to the query |
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301 | foreach ($schema['FIELDS'] as $field_name => $field_data) |
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302 | { |
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303 | $field_data['datatype'] = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_data['datatype']); |
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304 | |
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305 | $query .= $field_name.' '.$field_data['datatype']; |
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306 | |
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307 | if (!$field_data['allow_null']) |
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308 | $query .= ' NOT NULL'; |
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309 | |
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310 | if (isset($field_data['default'])) |
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311 | $query .= ' DEFAULT '.$field_data['default']; |
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312 | |
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313 | $query .= ",\n"; |
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314 | } |
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315 | |
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316 | // If we have a primary key, add it |
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317 | if (isset($schema['PRIMARY KEY'])) |
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318 | $query .= 'PRIMARY KEY ('.implode(',', $schema['PRIMARY KEY']).'),'."\n"; |
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319 | |
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320 | // Add unique keys |
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321 | if (isset($schema['UNIQUE KEYS'])) |
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322 | { |
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323 | foreach ($schema['UNIQUE KEYS'] as $key_name => $key_fields) |
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324 | $query .= 'UNIQUE ('.implode(',', $key_fields).'),'."\n"; |
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325 | } |
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326 | |
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327 | // We remove the last two characters (a newline and a comma) and add on the ending |
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328 | $query = substr($query, 0, strlen($query) - 2)."\n".')'; |
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329 | |
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330 | $result = $this->query($query) ? true : false; |
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331 | |
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332 | // Add indexes |
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333 | if (isset($schema['INDEXES'])) |
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334 | { |
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335 | foreach ($schema['INDEXES'] as $index_name => $index_fields) |
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336 | $result &= $this->add_index($table_name, $index_name, $index_fields, false, $no_prefix); |
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337 | } |
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338 | |
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339 | return $result; |
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340 | } |
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341 | |
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342 | |
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343 | function drop_table($table_name, $no_prefix = false) |
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344 | { |
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345 | if (!$this->table_exists($table_name, $no_prefix)) |
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346 | return true; |
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347 | |
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348 | return $this->query('DROP TABLE '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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349 | } |
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350 | |
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351 | |
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352 | function rename_table($old_name, $new_name, $no_prefix = false) |
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353 | { |
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354 | // If there new table exists and the old one doesn't, then we're happy |
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355 | if ($this->table_exists($new_table, $no_prefix) && !$this->table_exists($old_table, $no_prefix)) |
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356 | return true; |
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357 | |
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358 | $table = $this->get_table_info($old_name, $no_prefix); |
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359 | |
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360 | // Create new table |
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361 | $newtable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($old_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($new_name).' (', $table['sql']); |
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362 | $result = $this->query($newtable) ? true : false; |
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363 | |
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364 | // Recreate indexes |
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365 | if (!empty($table['indices'])) |
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366 | { |
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367 | foreach ($table['indices'] as $cur_index) |
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368 | $result &= $this->query($cur_index) ? true : false; |
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369 | } |
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370 | |
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371 | // Copy content across |
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372 | $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($new_name).' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($old_name)) ? true : false; |
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373 | |
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374 | // Drop old table |
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375 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name)); |
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376 | |
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377 | return $result; |
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378 | } |
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379 | |
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380 | |
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381 | function get_table_info($table_name, $no_prefix = false) |
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382 | { |
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383 | // Grab table info |
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384 | $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()); |
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385 | $num_rows = $this->num_rows($result); |
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386 | |
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387 | if ($num_rows == 0) |
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388 | return; |
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389 | |
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390 | $table = array(); |
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391 | $table['indices'] = array(); |
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392 | while ($cur_index = $this->fetch_assoc($result)) |
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393 | { |
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394 | if (empty($cur_index['sql'])) |
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395 | continue; |
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396 | |
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397 | if (!isset($table['sql'])) |
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398 | $table['sql'] = $cur_index['sql']; |
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399 | else |
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400 | $table['indices'][] = $cur_index['sql']; |
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401 | } |
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402 | |
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403 | // Work out the columns in the table currently |
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404 | $table_lines = explode("\n", $table['sql']); |
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405 | $table['columns'] = array(); |
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406 | foreach ($table_lines as $table_line) |
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407 | { |
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408 | $table_line = trim($table_line, " \t\n\r,"); // trim spaces, tabs, newlines, and commas |
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409 | if (substr($table_line, 0, 12) == 'CREATE TABLE') |
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410 | continue; |
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411 | else if (substr($table_line, 0, 11) == 'PRIMARY KEY') |
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412 | $table['primary_key'] = $table_line; |
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413 | else if (substr($table_line, 0, 6) == 'UNIQUE') |
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414 | $table['unique'] = $table_line; |
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415 | else if (substr($table_line, 0, strpos($table_line, ' ')) != '') |
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416 | $table['columns'][substr($table_line, 0, strpos($table_line, ' '))] = trim(substr($table_line, strpos($table_line, ' '))); |
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417 | } |
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418 | |
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419 | return $table; |
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420 | } |
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421 | |
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422 | |
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423 | function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = 0, $no_prefix = false) |
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424 | { |
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425 | if ($this->field_exists($table_name, $field_name, $no_prefix)) |
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426 | return true; |
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427 | |
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428 | $table = $this->get_table_info($table_name, $no_prefix); |
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429 | |
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430 | // Create temp table |
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431 | $now = time(); |
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432 | $tmptable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' (', $table['sql']); |
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433 | $result = $this->query($tmptable) ? true : false; |
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434 | $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; |
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435 | |
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436 | // Create new table sql |
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437 | $field_type = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_type); |
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438 | $query = $field_type; |
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439 | if (!$allow_null) |
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440 | $query .= ' NOT NULL'; |
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441 | if ($default_value === null || $default_value === '') |
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442 | $default_value = '\'\''; |
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443 | |
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444 | $query .= ' DEFAULT '.$default_value; |
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445 | |
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446 | $old_columns = array_keys($table['columns']); |
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447 | array_insert($table['columns'], $after_field, $query, $field_name); |
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448 | |
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449 | $new_table = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' ('; |
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450 | |
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451 | foreach ($table['columns'] as $cur_column => $column_details) |
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452 | $new_table .= "\n".$cur_column.' '.$column_details.','; |
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453 | |
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454 | if (isset($table['unique'])) |
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455 | $new_table .= "\n".$table['unique'].','; |
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456 | |
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457 | if (isset($table['primary_key'])) |
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458 | $new_table .= "\n".$table['primary_key'].','; |
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459 | |
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460 | $new_table = trim($new_table, ',')."\n".');'; |
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461 | |
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462 | // Drop old table |
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463 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name)); |
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464 | |
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465 | // Create new table |
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466 | $result &= $this->query($new_table) ? true : false; |
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467 | |
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468 | // Recreate indexes |
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469 | if (!empty($table['indices'])) |
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470 | { |
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471 | foreach ($table['indices'] as $cur_index) |
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472 | $result &= $this->query($cur_index) ? true : false; |
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473 | } |
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474 | |
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475 | // Copy content back |
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476 | $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; |
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477 | |
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478 | // Drop temp table |
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479 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now); |
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480 | |
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481 | return $result; |
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482 | } |
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483 | |
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484 | |
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485 | function alter_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = 0, $no_prefix = false) |
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486 | { |
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487 | // Unneeded for SQLite |
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488 | return true; |
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489 | } |
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490 | |
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491 | |
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492 | function drop_field($table_name, $field_name, $no_prefix = false) |
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493 | { |
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494 | if (!$this->field_exists($table_name, $field_name, $no_prefix)) |
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495 | return true; |
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496 | |
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497 | $table = $this->get_table_info($table_name, $no_prefix); |
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498 | |
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499 | // Create temp table |
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500 | $now = time(); |
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501 | $tmptable = str_replace('CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' (', 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' (', $table['sql']); |
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502 | $result = $this->query($tmptable) ? true : false; |
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503 | $result &= $this->query('INSERT INTO '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now.' SELECT * FROM '.($no_prefix ? '' : $this->prefix).$this->escape($table_name)) ? true : false; |
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504 | |
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505 | // Work out the columns we need to keep and the sql for the new table |
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506 | unset($table['columns'][$field_name]); |
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507 | $new_columns = array_keys($table['columns']); |
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508 | |
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509 | $new_table = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$this->escape($table_name).' ('; |
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510 | |
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511 | foreach ($table['columns'] as $cur_column => $column_details) |
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512 | $new_table .= "\n".$cur_column.' '.$column_details.','; |
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513 | |
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514 | if (isset($table['unique'])) |
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515 | $new_table .= "\n".$table['unique'].','; |
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516 | |
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517 | if (isset($table['primary_key'])) |
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518 | $new_table .= "\n".$table['primary_key'].','; |
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519 | |
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520 | $new_table = trim($new_table, ',')."\n".');'; |
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521 | |
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522 | // Drop old table |
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523 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name)); |
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524 | |
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525 | // Create new table |
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526 | $result &= $this->query($new_table) ? true : false; |
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527 | |
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528 | // Recreate indexes |
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529 | if (!empty($table['indices'])) |
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530 | { |
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531 | foreach ($table['indices'] as $cur_index) |
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532 | if (!preg_match('%\('.preg_quote($field_name, '%').'\)%', $cur_index)) |
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533 | $result &= $this->query($cur_index) ? true : false; |
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534 | } |
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535 | |
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536 | // Copy content back |
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537 | $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; |
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538 | |
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539 | // Drop temp table |
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540 | $result &= $this->drop_table(($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_t'.$now); |
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541 | |
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542 | return $result; |
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543 | } |
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544 | |
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545 | |
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546 | function add_index($table_name, $index_name, $index_fields, $unique = false, $no_prefix = false) |
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547 | { |
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548 | if ($this->index_exists($table_name, $index_name, $no_prefix)) |
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549 | return true; |
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550 | |
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551 | return $this->query('CREATE '.($unique ? 'UNIQUE ' : '').'INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name.' ON '.($no_prefix ? '' : $this->prefix).$table_name.'('.implode(',', $index_fields).')') ? true : false; |
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552 | } |
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553 | |
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554 | |
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555 | function drop_index($table_name, $index_name, $no_prefix = false) |
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556 | { |
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557 | if (!$this->index_exists($table_name, $index_name, $no_prefix)) |
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558 | return true; |
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559 | |
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560 | return $this->query('DROP INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name) ? true : false; |
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561 | } |
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562 | |
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563 | function truncate_table($table_name, $no_prefix = false) |
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564 | { |
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565 | return $this->query('DELETE FROM '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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566 | } |
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567 | } |
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