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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 $error_msg = 'Unknown'; |
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44 |
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45 |
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46 function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect) |
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47 { |
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48 $this->prefix = $db_prefix; |
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49 |
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50 if ($db_host != '') |
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51 { |
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52 if (strpos($db_host, ':') !== false) |
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53 { |
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54 list($db_host, $dbport) = explode(':', $db_host); |
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55 $connect_str[] = 'host='.$db_host.' port='.$dbport; |
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56 } |
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57 else |
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58 { |
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59 if ($db_host != 'localhost') |
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60 $connect_str[] = 'host='.$db_host; |
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61 } |
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62 } |
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63 |
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64 if ($db_name) |
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65 $connect_str[] = 'dbname='.$db_name; |
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66 |
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67 if ($db_username != '') |
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68 $connect_str[] = 'user='.$db_username; |
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69 |
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70 if ($db_password != '') |
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71 $connect_str[] = 'password='.$db_password; |
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72 |
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73 if ($p_connect) |
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74 $this->link_id = @pg_pconnect(implode(' ', $connect_str)); |
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75 else |
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76 $this->link_id = @pg_connect(implode(' ', $connect_str)); |
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77 |
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78 if (!$this->link_id) |
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79 error('Unable to connect to PostgreSQL server.', __FILE__, __LINE__); |
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80 else |
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81 return $this->link_id; |
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82 } |
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83 |
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84 |
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85 function start_transaction() |
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86 { |
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87 ++$this->in_transaction; |
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88 |
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89 return (@pg_query($this->link_id, 'BEGIN')) ? true : false; |
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90 } |
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91 |
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92 |
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93 function end_transaction() |
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94 { |
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95 --$this->in_transaction; |
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96 |
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97 if (@pg_query($this->link_id, 'COMMIT')) |
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98 return true; |
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99 else |
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100 { |
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101 @pg_query($this->link_id, 'ROLLBACK'); |
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102 return false; |
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103 } |
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104 } |
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105 |
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106 |
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107 function query($sql, $unbuffered = false) // $unbuffered is ignored since there is no pgsql_unbuffered_query() |
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108 { |
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109 if (strlen($sql) > 140000) |
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110 exit('Insane query. Aborting.'); |
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111 |
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112 if (strrpos($sql, 'LIMIT') !== false) |
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113 $sql = preg_replace('#LIMIT ([0-9]+),([ 0-9]+)#', 'LIMIT \\2 OFFSET \\1', $sql); |
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114 |
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115 if (defined('PUN_SHOW_QUERIES')) |
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116 $q_start = get_microtime(); |
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117 |
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118 @pg_send_query($this->link_id, $sql); |
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119 $this->query_result = @pg_get_result($this->link_id); |
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120 |
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121 if (pg_result_status($this->query_result) != PGSQL_FATAL_ERROR) |
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122 { |
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123 if (defined('PUN_SHOW_QUERIES')) |
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124 $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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125 |
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126 ++$this->num_queries; |
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127 |
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128 $this->last_query_text[$this->query_result] = $sql; |
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129 |
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130 return $this->query_result; |
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131 } |
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132 else |
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133 { |
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134 if (defined('PUN_SHOW_QUERIES')) |
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135 $this->saved_queries[] = array($sql, 0); |
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136 |
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137 $this->error_msg = @pg_result_error($this->query_result); |
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138 |
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139 if ($this->in_transaction) |
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140 @pg_query($this->link_id, 'ROLLBACK'); |
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141 |
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142 --$this->in_transaction; |
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143 |
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144 return false; |
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145 } |
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146 } |
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147 |
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148 |
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149 function query_build($query, $unbuffered = false) |
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150 { |
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151 $sql = ''; |
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152 |
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153 if (isset($query['SELECT'])) |
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154 { |
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155 $sql = 'SELECT '.$query['SELECT'].' FROM '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['FROM']; |
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156 |
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157 if (isset($query['JOINS'])) |
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158 { |
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159 foreach ($query['JOINS'] as $cur_join) |
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160 $sql .= ' '.key($cur_join).' '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).current($cur_join).' ON '.$cur_join['ON']; |
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161 } |
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162 |
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163 if (!empty($query['WHERE'])) |
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164 $sql .= ' WHERE '.$query['WHERE']; |
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165 if (!empty($query['GROUP BY'])) |
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166 $sql .= ' GROUP BY '.$query['GROUP BY']; |
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167 if (!empty($query['HAVING'])) |
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168 $sql .= ' HAVING '.$query['HAVING']; |
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169 if (!empty($query['ORDER BY'])) |
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170 $sql .= ' ORDER BY '.$query['ORDER BY']; |
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171 if (!empty($query['LIMIT'])) |
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172 $sql .= ' LIMIT '.$query['LIMIT']; |
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173 } |
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174 else if (isset($query['INSERT'])) |
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175 { |
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176 $sql = 'INSERT INTO '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['INTO']; |
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177 |
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178 if (!empty($query['INSERT'])) |
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179 $sql .= ' ('.$query['INSERT'].')'; |
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180 |
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181 $sql .= ' VALUES('.$query['VALUES'].')'; |
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182 } |
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183 else if (isset($query['UPDATE'])) |
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184 { |
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185 $query['UPDATE'] = (isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['UPDATE']; |
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186 |
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187 $sql = 'UPDATE '.$query['UPDATE'].' SET '.$query['SET']; |
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188 |
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189 if (!empty($query['WHERE'])) |
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190 $sql .= ' WHERE '.$query['WHERE']; |
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191 } |
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192 else if (isset($query['DELETE'])) |
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193 { |
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194 $sql = 'DELETE FROM '.(isset($query['PARAMS']['NO_PREFIX']) ? '' : $this->prefix).$query['DELETE']; |
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195 |
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196 if (!empty($query['WHERE'])) |
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197 $sql .= ' WHERE '.$query['WHERE']; |
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198 } |
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199 |
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200 return $this->query($sql, $unbuffered); |
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201 } |
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202 |
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203 |
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204 function result($query_id = 0, $row = 0) |
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205 { |
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206 return ($query_id) ? @pg_fetch_result($query_id, $row, 0) : false; |
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207 } |
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208 |
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209 |
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210 function fetch_assoc($query_id = 0) |
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211 { |
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212 return ($query_id) ? @pg_fetch_assoc($query_id) : false; |
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213 } |
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214 |
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215 |
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216 function fetch_row($query_id = 0) |
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217 { |
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218 return ($query_id) ? @pg_fetch_row($query_id) : false; |
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219 } |
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220 |
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221 |
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222 function num_rows($query_id = 0) |
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223 { |
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224 return ($query_id) ? @pg_num_rows($query_id) : false; |
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225 } |
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226 |
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227 |
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228 function affected_rows() |
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229 { |
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230 return ($this->query_result) ? @pg_affected_rows($this->query_result) : false; |
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231 } |
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232 |
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233 |
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234 function insert_id() |
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235 { |
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236 $query_id = $this->query_result; |
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237 |
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238 if ($query_id && $this->last_query_text[$query_id] != '') |
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239 { |
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240 if (preg_match('/^INSERT INTO ([a-z0-9\_\-]+)/is', $this->last_query_text[$query_id], $table_name)) |
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241 { |
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242 // Hack (don't ask) |
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243 if (substr($table_name[1], -6) == 'groups') |
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244 $table_name[1] .= '_g'; |
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245 |
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246 $temp_q_id = @pg_query($this->link_id, 'SELECT currval(\''.$table_name[1].'_id_seq\')'); |
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247 return ($temp_q_id) ? intval(@pg_fetch_result($temp_q_id, 0)) : false; |
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248 } |
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249 } |
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250 |
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251 return false; |
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252 } |
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253 |
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254 |
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255 function get_num_queries() |
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256 { |
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257 return $this->num_queries; |
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258 } |
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259 |
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260 |
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261 function get_saved_queries() |
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262 { |
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263 return $this->saved_queries; |
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264 } |
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265 |
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266 |
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267 function free_result($query_id = false) |
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268 { |
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269 if (!$query_id) |
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270 $query_id = $this->query_result; |
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271 |
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272 return ($query_id) ? @pg_free_result($query_id) : false; |
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273 } |
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274 |
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275 |
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276 function escape($str) |
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277 { |
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278 return is_array($str) ? '' : pg_escape_string($str); |
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279 } |
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280 |
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281 |
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282 function error() |
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283 { |
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284 $result['error_sql'] = @current(@end($this->saved_queries)); |
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285 $result['error_no'] = false; |
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286 /* |
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287 if (!empty($this->query_result)) |
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288 { |
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289 $result['error_msg'] = trim(@pg_result_error($this->query_result)); |
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290 if ($result['error_msg'] != '') |
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291 return $result; |
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292 } |
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293 |
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294 $result['error_msg'] = (!empty($this->link_id)) ? trim(@pg_last_error($this->link_id)) : trim(@pg_last_error()); |
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295 */ |
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296 $result['error_msg'] = $this->error_msg; |
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297 |
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298 return $result; |
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299 } |
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300 |
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301 |
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302 function close() |
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303 { |
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304 if ($this->link_id) |
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305 { |
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306 if ($this->in_transaction) |
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307 { |
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308 if (defined('PUN_SHOW_QUERIES')) |
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309 $this->saved_queries[] = array('COMMIT', 0); |
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310 |
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311 @pg_query($this->link_id, 'COMMIT'); |
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312 } |
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313 |
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314 if ($this->query_result) |
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315 @pg_free_result($this->query_result); |
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316 |
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317 return @pg_close($this->link_id); |
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318 } |
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319 else |
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320 return false; |
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321 } |
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322 |
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323 |
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324 function table_exists($table_name) |
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325 { |
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326 $result = $this->query('SELECT 1 FROM pg_class WHERE relname = \''.$this->escape($table_name).'\''); |
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327 return $this->num_rows($result) > 0; |
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328 } |
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329 |
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330 |
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331 function field_exists($table_name, $field_name) |
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332 { |
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333 $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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334 return $this->num_rows($result) > 0; |
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335 } |
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336 |
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337 |
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338 function index_exists($table_name, $index_name) |
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339 { |
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340 $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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341 return $this->num_rows($result) > 0; |
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342 } |
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343 |
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344 |
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345 function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null) |
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346 { |
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347 if ($this->field_exists($table_name, $field_name)) |
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348 return; |
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349 |
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350 $field_type = str_replace(array('TINY', 'FLOAT'), array('SMALL', 'REAL'), strtoupper($field_type)); |
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351 $field_type = preg_replace('/(.*?INT)(\([0-9]+)\)/', '$1', $field_type); |
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352 |
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353 $this->query('ALTER TABLE '.$table_name.' ADD '.$field_name.' '.$field_type) or error(__FILE__, __LINE__); |
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354 |
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355 if ($default_value !== null) |
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356 { |
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357 if (!is_int($default_value) && !is_float($default_value)) |
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358 $default_value = '\''.$this->escape($default_value).'\''; |
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359 |
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360 $this->query('ALTER TABLE '.$table_name.' ALTER '.$field_name.' SET DEFAULT '.$default_value) or error(__FILE__, __LINE__); |
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361 $this->query('UPDATE '.$table_name.' SET '.$field_name.'='.$default_value) or error(__FILE__, __LINE__); |
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362 } |
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363 |
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364 if (!$allow_null) |
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365 $this->query('ALTER TABLE '.$table_name.' ALTER '.$field_name.' SET NOT NULL') or error(__FILE__, __LINE__); |
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366 } |
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367 |
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368 |
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369 function drop_field($table_name, $field_name) |
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370 { |
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371 if (!$this->field_exists($table_name, $field_name)) |
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372 return; |
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373 |
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374 $this->query('ALTER TABLE '.$table_name.' DROP '.$field_name) or error(__FILE__, __LINE__); |
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375 } |
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376 } |