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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 PostgreSQL |
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27 if (!function_exists('pg_connect')) |
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28 exit('This PHP environment doesn\'t have PostgreSQL support built in. PostgreSQL support is required if you want to use a PostgreSQL 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 $last_query_text = array(); |
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37 var $in_transaction = 0; |
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38 |
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39 var $saved_queries = array(); |
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40 var $num_queries = 0; |
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41 |
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42 var $error_no = false; |
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43 var $error_msg = 'Unknown'; |
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44 |
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45 |
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46 function DBLayer() |
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47 { |
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48 global $db; |
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49 $this->prefix = table_prefix . 'pun_'; |
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50 $this->link_id =& $db->_conn; |
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51 } |
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52 |
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53 |
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54 function start_transaction() |
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55 { |
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56 ++$this->in_transaction; |
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57 |
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58 return (@pg_query($this->link_id, 'BEGIN')) ? true : false; |
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59 } |
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60 |
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61 |
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62 function end_transaction() |
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63 { |
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64 --$this->in_transaction; |
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65 |
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66 if (@pg_query($this->link_id, 'COMMIT')) |
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67 return true; |
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68 else |
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69 { |
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70 @pg_query($this->link_id, 'ROLLBACK'); |
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71 return false; |
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72 } |
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73 } |
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74 |
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75 |
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76 function query($sql, $unbuffered = false) // $unbuffered is ignored since there is no pgsql_unbuffered_query() |
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77 { |
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78 if (strlen($sql) > 140000) |
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79 exit('Insane query. Aborting.'); |
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80 |
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81 if (strrpos($sql, 'LIMIT') !== false) |
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82 $sql = preg_replace('#LIMIT ([0-9]+),([ 0-9]+)#', 'LIMIT \\2 OFFSET \\1', $sql); |
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83 |
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84 if (defined('PUN_SHOW_QUERIES')) |
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85 $q_start = get_microtime(); |
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86 |
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87 @pg_send_query($this->link_id, $sql); |
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88 $this->query_result = @pg_get_result($this->link_id); |
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89 |
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90 if (pg_result_status($this->query_result) != PGSQL_FATAL_ERROR) |
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91 { |
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92 if (defined('PUN_SHOW_QUERIES')) |
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93 $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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94 |
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95 ++$this->num_queries; |
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96 |
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97 $this->last_query_text[$this->query_result] = $sql; |
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98 |
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99 return $this->query_result; |
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100 } |
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101 else |
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102 { |
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103 if (defined('PUN_SHOW_QUERIES')) |
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104 $this->saved_queries[] = array($sql, 0); |
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105 |
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106 $this->error_msg = @pg_result_error($this->query_result); |
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107 |
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108 if ($this->in_transaction) |
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109 @pg_query($this->link_id, 'ROLLBACK'); |
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110 |
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111 --$this->in_transaction; |
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112 |
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113 return false; |
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114 } |
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115 } |
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116 |
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117 |
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118 function query_build($query, $unbuffered = false) |
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119 { |
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120 $sql = ''; |
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121 |
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122 if (isset($query['SELECT'])) |
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123 { |
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124 $sql = 'SELECT '.$query['SELECT'].' FROM '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['FROM']; |
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125 |
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126 if (isset($query['JOINS'])) |
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127 { |
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128 foreach ($query['JOINS'] as $cur_join) |
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129 $sql .= ' '.key($cur_join).' '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).current($cur_join).' ON '.$cur_join['ON']; |
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130 } |
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131 |
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132 if (!empty($query['WHERE'])) |
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133 $sql .= ' WHERE '.$query['WHERE']; |
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134 if (!empty($query['GROUP BY'])) |
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135 $sql .= ' GROUP BY '.$query['GROUP BY']; |
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136 if (!empty($query['HAVING'])) |
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137 $sql .= ' HAVING '.$query['HAVING']; |
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138 if (!empty($query['ORDER BY'])) |
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139 $sql .= ' ORDER BY '.$query['ORDER BY']; |
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140 if (!empty($query['LIMIT'])) |
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141 $sql .= ' LIMIT '.$query['LIMIT']; |
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142 } |
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143 else if (isset($query['INSERT'])) |
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144 { |
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145 $sql = 'INSERT INTO '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['INTO']; |
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146 |
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147 if (!empty($query['INSERT'])) |
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148 $sql .= ' ('.$query['INSERT'].')'; |
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149 |
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150 $sql .= ' VALUES('.$query['VALUES'].')'; |
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151 } |
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152 else if (isset($query['UPDATE'])) |
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153 { |
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154 $query['UPDATE'] = (isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['UPDATE']; |
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155 |
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156 $sql = 'UPDATE '.$query['UPDATE'].' SET '.$query['SET']; |
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157 |
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158 if (!empty($query['WHERE'])) |
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159 $sql .= ' WHERE '.$query['WHERE']; |
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160 } |
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161 else if (isset($query['DELETE'])) |
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162 { |
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163 $sql = 'DELETE FROM '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['DELETE']; |
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164 |
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165 if (!empty($query['WHERE'])) |
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166 $sql .= ' WHERE '.$query['WHERE']; |
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167 } |
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168 |
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169 return $this->query($sql, $unbuffered); |
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170 } |
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171 |
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172 |
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173 function result($query_id = 0, $row = 0) |
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174 { |
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175 return ($query_id) ? @pg_fetch_result($query_id, $row, 0) : false; |
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176 } |
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177 |
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178 |
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179 function fetch_assoc($query_id = 0) |
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180 { |
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181 return ($query_id) ? @pg_fetch_assoc($query_id) : false; |
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182 } |
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183 |
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184 |
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185 function fetch_row($query_id = 0) |
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186 { |
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187 return ($query_id) ? @pg_fetch_row($query_id) : false; |
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188 } |
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189 |
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190 |
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191 function num_rows($query_id = 0) |
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192 { |
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193 return ($query_id) ? @pg_num_rows($query_id) : false; |
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194 } |
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195 |
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196 |
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197 function affected_rows() |
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198 { |
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199 return ($this->query_result) ? @pg_affected_rows($this->query_result) : false; |
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200 } |
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201 |
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202 |
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203 function insert_id() |
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204 { |
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205 $query_id = $this->query_result; |
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206 |
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207 if ($query_id && $this->last_query_text[$query_id] != '') |
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208 { |
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209 if (preg_match('/^INSERT INTO ([a-z0-9\_\-]+)/is', $this->last_query_text[$query_id], $table_name)) |
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210 { |
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211 // Hack (don't ask) |
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212 if (substr($table_name[1], -6) == 'groups') |
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213 $table_name[1] .= '_g'; |
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214 |
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215 $temp_q_id = @pg_query($this->link_id, 'SELECT currval(\''.$table_name[1].'_id_seq\')'); |
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216 return ($temp_q_id) ? intval(@pg_fetch_result($temp_q_id, 0)) : false; |
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217 } |
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218 } |
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219 |
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220 return false; |
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221 } |
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222 |
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223 |
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224 function get_num_queries() |
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225 { |
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226 return $this->num_queries; |
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227 } |
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228 |
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229 |
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230 function get_saved_queries() |
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231 { |
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232 return $this->saved_queries; |
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233 } |
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234 |
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235 |
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236 function free_result($query_id = false) |
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237 { |
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238 if (!$query_id) |
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239 $query_id = $this->query_result; |
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240 |
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241 return ($query_id) ? @pg_free_result($query_id) : false; |
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242 } |
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243 |
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244 |
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245 function escape($str) |
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246 { |
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247 return is_array($str) ? '' : pg_escape_string($str); |
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248 } |
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249 |
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250 |
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251 function error() |
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252 { |
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253 $result['error_sql'] = @current(@end($this->saved_queries)); |
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254 $result['error_no'] = false; |
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255 /* |
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256 if (!empty($this->query_result)) |
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257 { |
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258 $result['error_msg'] = trim(@pg_result_error($this->query_result)); |
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259 if ($result['error_msg'] != '') |
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260 return $result; |
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261 } |
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262 |
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263 $result['error_msg'] = (!empty($this->link_id)) ? trim(@pg_last_error($this->link_id)) : trim(@pg_last_error()); |
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264 */ |
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265 $result['error_msg'] = $this->error_msg; |
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266 |
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267 return $result; |
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268 } |
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269 |
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270 |
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271 function close() |
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272 { |
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273 if ($this->link_id) |
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274 { |
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275 if ($this->in_transaction) |
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276 { |
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277 if (defined('PUN_SHOW_QUERIES')) |
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278 $this->saved_queries[] = array('COMMIT', 0); |
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279 |
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280 @pg_query($this->link_id, 'COMMIT'); |
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281 } |
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282 |
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283 if ($this->query_result) |
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284 @pg_free_result($this->query_result); |
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285 } |
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286 return true; |
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287 } |
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288 |
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289 |
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290 function table_exists($table_name) |
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291 { |
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292 $result = $this->query('SELECT 1 FROM pg_class WHERE relname = \''.$this->escape($table_name).'\''); |
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293 return $this->num_rows($result) > 0; |
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294 } |
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295 |
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296 |
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297 function field_exists($table_name, $field_name) |
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298 { |
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299 $result = $this->query('SELECT 1 FROM pg_class c INNER JOIN pg_attribute a ON a.attrelid = c.oid WHERE c.relname = \''.$this->escape($table_name).'\' AND a.attname = \''.$this->escape($field_name).'\''); |
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300 return $this->num_rows($result) > 0; |
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301 } |
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302 |
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303 |
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304 function index_exists($table_name, $index_name) |
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305 { |
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306 $result = $this->query('SELECT 1 FROM pg_index i INNER JOIN pg_class c1 ON c1.oid = i.indrelid INNER JOIN pg_class c2 ON c2.oid = i.indexrelid WHERE c1.relname = \''.$this->escape($table_name).'\' AND c2.relname = \''.$this->escape($index_name).'\''); |
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307 return $this->num_rows($result) > 0; |
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308 } |
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309 |
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310 |
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311 function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null) |
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312 { |
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313 if ($this->field_exists($table_name, $field_name)) |
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314 return; |
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315 |
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316 $field_type = str_replace(array('TINY', 'FLOAT'), array('SMALL', 'REAL'), strtoupper($field_type)); |
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317 $field_type = preg_replace('/(.*?INT)(\([0-9]+)\)/', '$1', $field_type); |
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318 |
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319 $this->query('ALTER TABLE '.$table_name.' ADD '.$field_name.' '.$field_type) or error(__FILE__, __LINE__); |
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320 |
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321 if ($default_value !== null) |
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322 { |
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323 if (!is_int($default_value) && !is_float($default_value)) |
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324 $default_value = '\''.$this->escape($default_value).'\''; |
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325 |
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326 $this->query('ALTER TABLE '.$table_name.' ALTER '.$field_name.' SET DEFAULT '.$default_value) or error(__FILE__, __LINE__); |
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327 $this->query('UPDATE '.$table_name.' SET '.$field_name.'='.$default_value) or error(__FILE__, __LINE__); |
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328 } |
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329 |
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330 if (!$allow_null) |
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331 $this->query('ALTER TABLE '.$table_name.' ALTER '.$field_name.' SET NOT NULL') or error(__FILE__, __LINE__); |
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332 } |
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333 |
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334 |
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335 function drop_field($table_name, $field_name) |
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336 { |
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337 if (!$this->field_exists($table_name, $field_name)) |
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338 return; |
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339 |
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340 $this->query('ALTER TABLE '.$table_name.' DROP '.$field_name) or error(__FILE__, __LINE__); |
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341 } |
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342 } |