1 <?php |
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2 /*********************************************************************** |
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3 |
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4 Copyright (C) 2002-2005 Rickard Andersson (rickard@punbb.org) |
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5 |
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6 This file is part of PunBB. |
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7 |
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8 PunBB is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published |
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10 by the Free Software Foundation; either version 2 of the License, |
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11 or (at your option) any later version. |
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12 |
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13 PunBB is distributed in the hope that it will be useful, but |
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14 WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 GNU General Public License for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with this program; if not, write to the Free Software |
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20 Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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21 MA 02111-1307 USA |
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22 |
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23 ************************************************************************/ |
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24 |
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25 |
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26 // Make sure we have built in support for SQLite |
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27 if (!function_exists('sqlite_open')) |
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28 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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29 |
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30 |
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31 class DBLayer |
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32 { |
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33 var $prefix; |
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34 var $link_id; |
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35 var $query_result; |
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36 var $in_transaction = 0; |
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37 |
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38 var $saved_queries = array(); |
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39 var $num_queries = 0; |
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40 |
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41 var $error_no = false; |
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42 var $error_msg = 'Unknown'; |
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43 |
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44 |
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45 function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect) |
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46 { |
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47 // Prepend $db_name with the path to the forum root directory |
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48 $db_name = PUN_ROOT.$db_name; |
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49 |
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50 $this->prefix = $db_prefix; |
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51 |
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52 if (!file_exists($db_name)) |
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53 { |
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54 @touch($db_name); |
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55 @chmod($db_name, 0666); |
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56 if (!file_exists($db_name)) |
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57 error('Unable to create new database \''.$db_name.'\'. Permission denied', __FILE__, __LINE__); |
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58 } |
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59 |
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60 if (!is_readable($db_name)) |
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61 error('Unable to open database \''.$db_name.'\' for reading. Permission denied', __FILE__, __LINE__); |
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62 |
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63 if (!is_writable($db_name)) |
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64 error('Unable to open database \''.$db_name.'\' for writing. Permission denied', __FILE__, __LINE__); |
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65 |
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66 if ($p_connect) |
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67 $this->link_id = @sqlite_popen($db_name, 0666, $sqlite_error); |
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68 else |
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69 $this->link_id = @sqlite_open($db_name, 0666, $sqlite_error); |
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70 |
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71 if (!$this->link_id) |
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72 error('Unable to open database \''.$db_name.'\'. SQLite reported: '.$sqlite_error, __FILE__, __LINE__); |
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73 else |
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74 return $this->link_id; |
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75 } |
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76 |
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77 |
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78 function start_transaction() |
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79 { |
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80 ++$this->in_transaction; |
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81 |
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82 return (@sqlite_query($this->link_id, 'BEGIN')) ? true : false; |
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83 } |
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84 |
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85 |
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86 function end_transaction() |
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87 { |
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88 --$this->in_transaction; |
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89 |
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90 if (@sqlite_query($this->link_id, 'COMMIT')) |
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91 return true; |
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92 else |
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93 { |
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94 @sqlite_query($this->link_id, 'ROLLBACK'); |
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95 return false; |
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96 } |
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97 } |
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98 |
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99 |
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100 function query($sql, $unbuffered = false) |
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101 { |
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102 if (defined('PUN_SHOW_QUERIES')) |
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103 $q_start = get_microtime(); |
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104 |
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105 if ($unbuffered) |
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106 $this->query_result = @sqlite_unbuffered_query($this->link_id, $sql); |
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107 else |
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108 $this->query_result = @sqlite_query($this->link_id, $sql); |
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109 |
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110 if ($this->query_result) |
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111 { |
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112 if (defined('PUN_SHOW_QUERIES')) |
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113 $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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114 |
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115 ++$this->num_queries; |
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116 |
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117 return $this->query_result; |
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118 } |
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119 else |
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120 { |
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121 if (defined('PUN_SHOW_QUERIES')) |
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122 $this->saved_queries[] = array($sql, 0); |
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123 |
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124 $this->error_no = @sqlite_last_error($this->link_id); |
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125 $this->error_msg = @sqlite_error_string($this->error_no); |
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126 |
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127 if ($this->in_transaction) |
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128 @sqlite_query($this->link_id, 'ROLLBACK'); |
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129 |
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130 --$this->in_transaction; |
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131 |
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132 return false; |
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133 } |
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134 } |
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135 |
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136 |
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137 function result($query_id = 0, $row = 0) |
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138 { |
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139 if ($query_id) |
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140 { |
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141 if ($row != 0) |
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142 @sqlite_seek($query_id, $row); |
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143 |
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144 return @current(@sqlite_current($query_id)); |
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145 } |
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146 else |
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147 return false; |
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148 } |
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149 |
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150 |
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151 function fetch_assoc($query_id = 0) |
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152 { |
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153 if ($query_id) |
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154 { |
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155 $cur_row = @sqlite_fetch_array($query_id, SQLITE_ASSOC); |
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156 if ($cur_row) |
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157 { |
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158 // Horrible hack to get rid of table names and table aliases from the array keys |
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159 while (list($key, $value) = @each($cur_row)) |
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160 { |
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161 $dot_spot = strpos($key, '.'); |
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162 if ($dot_spot !== false) |
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163 { |
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164 unset($cur_row[$key]); |
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165 $key = substr($key, $dot_spot+1); |
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166 $cur_row[$key] = $value; |
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167 } |
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168 } |
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169 } |
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170 |
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171 return $cur_row; |
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172 } |
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173 else |
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174 return false; |
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175 } |
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176 |
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177 |
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178 function fetch_row($query_id = 0) |
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179 { |
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180 return ($query_id) ? @sqlite_fetch_array($query_id, SQLITE_NUM) : false; |
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181 } |
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182 |
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183 |
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184 function num_rows($query_id = 0) |
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185 { |
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186 return ($query_id) ? @sqlite_num_rows($query_id) : false; |
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187 } |
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188 |
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189 |
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190 function affected_rows() |
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191 { |
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192 return ($this->query_result) ? @sqlite_changes($this->query_result) : false; |
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193 } |
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194 |
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195 |
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196 function insert_id() |
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197 { |
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198 return ($this->link_id) ? @sqlite_last_insert_rowid($this->link_id) : false; |
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199 } |
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200 |
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201 |
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202 function get_num_queries() |
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203 { |
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204 return $this->num_queries; |
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205 } |
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206 |
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207 |
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208 function get_saved_queries() |
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209 { |
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210 return $this->saved_queries; |
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211 } |
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212 |
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213 |
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214 function free_result($query_id = false) |
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215 { |
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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 function escape($str) |
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221 { |
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222 return is_array($str) ? '' : sqlite_escape_string($str); |
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223 } |
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224 |
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225 |
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226 function error() |
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227 { |
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228 $result['error_sql'] = @current(@end($this->saved_queries)); |
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229 $result['error_no'] = $this->error_no; |
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230 $result['error_msg'] = $this->error_msg; |
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231 |
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232 return $result; |
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233 } |
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234 |
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235 |
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236 function close() |
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237 { |
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238 if ($this->link_id) |
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239 { |
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240 if ($this->in_transaction) |
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241 { |
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242 if (defined('PUN_SHOW_QUERIES')) |
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243 $this->saved_queries[] = array('COMMIT', 0); |
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244 |
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245 @sqlite_query($this->link_id, 'COMMIT'); |
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246 } |
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247 |
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248 return @sqlite_close($this->link_id); |
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249 } |
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250 else |
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251 return false; |
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252 } |
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253 } |
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