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1 <?php |
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2 /*********************************************************************** |
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3 |
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4 Copyright (C) 2002-2008 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 MySQL |
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27 if (!function_exists('mysql_connect')) |
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28 exit('This PHP environment doesn\'t have MySQL support built in. MySQL support is required if you want to use a MySQL 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 |
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37 var $saved_queries = array(); |
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38 var $num_queries = 0; |
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39 |
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40 |
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41 function DBLayer() |
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42 { |
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43 global $db; |
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44 $this->prefix = table_prefix . 'pun_'; |
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45 $this->link_id =& $db->_conn; |
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46 |
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47 // Setup the client-server character set (UTF-8) |
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48 if (!defined('PUN_NO_SET_NAMES')) |
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49 mysql_query('SET NAMES \'utf8\'', $this->link_id) or error(__FILE__, __LINE__); |
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50 } |
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51 |
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52 |
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53 function start_transaction() |
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54 { |
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55 return; |
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56 } |
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57 |
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58 |
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59 function end_transaction() |
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60 { |
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61 return; |
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62 } |
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63 |
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64 |
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65 function query($sql, $unbuffered = false) |
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66 { |
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67 if (strlen($sql) > 140000) |
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68 exit('Insane query. Aborting.'); |
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69 |
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70 if (defined('PUN_SHOW_QUERIES')) |
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71 $q_start = get_microtime(); |
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72 |
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73 if ($unbuffered) |
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74 $this->query_result = @mysql_unbuffered_query($sql, $this->link_id); |
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75 else |
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76 $this->query_result = @mysql_query($sql, $this->link_id); |
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77 |
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78 if ($this->query_result) |
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79 { |
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80 if (defined('PUN_SHOW_QUERIES')) |
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81 $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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82 |
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83 ++$this->num_queries; |
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84 |
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85 return $this->query_result; |
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86 } |
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87 else |
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88 { |
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89 if (defined('PUN_SHOW_QUERIES')) |
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90 $this->saved_queries[] = array($sql, 0); |
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91 |
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92 return false; |
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93 } |
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94 } |
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95 |
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96 |
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97 function query_build($query, $unbuffered = false) |
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98 { |
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99 $sql = ''; |
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100 |
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101 if (isset($query['SELECT'])) |
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102 { |
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103 $sql = 'SELECT '.$query['SELECT'].' FROM '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['FROM']; |
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104 |
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105 if (isset($query['JOINS'])) |
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106 { |
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107 foreach ($query['JOINS'] as $cur_join) |
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108 $sql .= ' '.key($cur_join).' '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).current($cur_join).' ON '.$cur_join['ON']; |
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109 } |
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110 |
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111 if (!empty($query['WHERE'])) |
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112 $sql .= ' WHERE '.$query['WHERE']; |
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113 if (!empty($query['GROUP BY'])) |
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114 $sql .= ' GROUP BY '.$query['GROUP BY']; |
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115 if (!empty($query['HAVING'])) |
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116 $sql .= ' HAVING '.$query['HAVING']; |
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117 if (!empty($query['ORDER BY'])) |
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118 $sql .= ' ORDER BY '.$query['ORDER BY']; |
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119 if (!empty($query['LIMIT'])) |
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120 $sql .= ' LIMIT '.$query['LIMIT']; |
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121 } |
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122 else if (isset($query['INSERT'])) |
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123 { |
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124 $sql = 'INSERT INTO '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['INTO']; |
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125 |
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126 if (!empty($query['INSERT'])) |
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127 $sql .= ' ('.$query['INSERT'].')'; |
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128 |
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129 $sql .= ' VALUES('.$query['VALUES'].')'; |
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130 } |
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131 else if (isset($query['UPDATE'])) |
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132 { |
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133 $query['UPDATE'] = (isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['UPDATE']; |
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134 |
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135 if (isset($query['PARAMS']['LOW_PRIORITY'])) |
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136 $query['UPDATE'] = 'LOW_PRIORITY '.$query['UPDATE']; |
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137 |
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138 $sql = 'UPDATE '.$query['UPDATE'].' SET '.$query['SET']; |
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139 |
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140 if (!empty($query['WHERE'])) |
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141 $sql .= ' WHERE '.$query['WHERE']; |
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142 } |
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143 else if (isset($query['DELETE'])) |
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144 { |
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145 $sql = 'DELETE FROM '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['DELETE']; |
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146 |
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147 if (!empty($query['WHERE'])) |
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148 $sql .= ' WHERE '.$query['WHERE']; |
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149 } |
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150 else if (isset($query['REPLACE'])) |
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151 { |
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152 $sql = 'REPLACE INTO '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['INTO']; |
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153 |
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154 if (!empty($query['REPLACE'])) |
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155 $sql .= ' ('.$query['REPLACE'].')'; |
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156 |
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157 $sql .= ' VALUES('.$query['VALUES'].')'; |
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158 } |
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159 |
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160 return $this->query($sql, $unbuffered); |
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161 } |
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162 |
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163 function result($query_id = 0, $row = 0) |
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164 { |
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165 return ($query_id) ? @mysql_result($query_id, $row) : false; |
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166 } |
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167 |
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168 |
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169 function fetch_assoc($query_id = 0) |
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170 { |
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171 return ($query_id) ? @mysql_fetch_assoc($query_id) : false; |
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172 } |
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173 |
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174 |
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175 function fetch_row($query_id = 0) |
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176 { |
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177 return ($query_id) ? @mysql_fetch_row($query_id) : false; |
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178 } |
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179 |
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180 |
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181 function num_rows($query_id = 0) |
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182 { |
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183 return ($query_id) ? @mysql_num_rows($query_id) : false; |
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184 } |
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185 |
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186 |
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187 function affected_rows() |
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188 { |
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189 return ($this->link_id) ? @mysql_affected_rows($this->link_id) : false; |
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190 } |
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191 |
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192 |
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193 function insert_id() |
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194 { |
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195 return ($this->link_id) ? @mysql_insert_id($this->link_id) : false; |
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196 } |
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197 |
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198 |
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199 function get_num_queries() |
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200 { |
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201 return $this->num_queries; |
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202 } |
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203 |
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204 |
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205 function get_saved_queries() |
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206 { |
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207 return $this->saved_queries; |
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208 } |
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209 |
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210 |
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211 function free_result($query_id = false) |
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212 { |
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213 return ($query_id) ? @mysql_free_result($query_id) : false; |
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214 } |
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215 |
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216 |
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217 function escape($str) |
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218 { |
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219 if (is_array($str)) |
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220 return ''; |
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221 else if (function_exists('mysql_real_escape_string')) |
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222 return mysql_real_escape_string($str, $this->link_id); |
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223 else |
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224 return mysql_escape_string($str); |
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225 } |
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226 |
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227 |
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228 function error() |
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229 { |
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230 $result['error_sql'] = @current(@end($this->saved_queries)); |
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231 $result['error_no'] = @mysql_errno($this->link_id); |
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232 $result['error_msg'] = @mysql_error($this->link_id); |
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233 |
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234 return $result; |
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235 } |
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236 |
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237 |
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238 function close() |
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239 { |
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240 return true; |
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241 } |
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242 |
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243 |
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244 function table_exists($table_name) |
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245 { |
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246 $result = $this->query('SHOW TABLES LIKE \''.$this->escape($table_name).'\''); |
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247 return $this->num_rows($result) > 0; |
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248 } |
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249 |
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250 |
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251 function field_exists($table_name, $field_name) |
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252 { |
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253 $result = $this->query('SHOW COLUMNS FROM '.$table_name.' LIKE \''.$this->escape($field_name).'\''); |
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254 return $this->num_rows($result) > 0; |
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255 } |
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256 |
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257 |
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258 function index_exists($table_name, $index_name) |
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259 { |
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260 $exists = false; |
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261 |
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262 $result = $this->query('SHOW INDEX FROM '.$table_name); |
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263 while ($cur_index = $this->fetch_assoc($result)) |
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264 { |
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265 if ($cur_index['Key_name'] == $index_name) |
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266 { |
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267 $exists = true; |
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268 break; |
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269 } |
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270 } |
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271 |
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272 return $exists; |
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273 } |
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274 |
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275 |
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276 function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null) |
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277 { |
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278 if ($this->field_exists($table_name, $field_name)) |
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279 return; |
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280 |
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281 if ($default_value !== null && !is_int($default_value) && !is_float($default_value)) |
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282 $default_value = '\''.$this->escape($default_value).'\''; |
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283 |
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284 $this->query('ALTER TABLE '.$table_name.' ADD '.$field_name.' '.$field_type.($allow_null ? ' ' : ' NOT NULL').($default_value !== null ? ' DEFAULT '.$default_value : ' ').($after_field != null ? ' AFTER '.$after_field : '')) or error(__FILE__, __LINE__); |
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285 } |
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286 |
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287 |
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288 function drop_field($table_name, $field_name) |
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289 { |
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290 if (!$this->field_exists($table_name, $field_name)) |
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291 return; |
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292 |
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293 $this->query('ALTER TABLE '.$table_name.' DROP '.$field_name) or error(__FILE__, __LINE__); |
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294 } |
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295 } |