1 | <?php |
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2 | |
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3 | /** |
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4 | * Copyright (C) 2008-2011 FluxBB |
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5 | * based on code by Rickard Andersson copyright (C) 2002-2008 PunBB |
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6 | * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher |
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7 | */ |
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8 | |
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9 | // Make sure we have built in support for PostgreSQL |
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10 | if (!function_exists('pg_connect')) |
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11 | 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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12 | |
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13 | |
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14 | class DBLayer |
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15 | { |
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16 | var $prefix; |
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17 | var $link_id; |
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18 | var $query_result; |
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19 | var $last_query_text = array(); |
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20 | var $in_transaction = 0; |
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21 | |
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22 | var $saved_queries = array(); |
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23 | var $num_queries = 0; |
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24 | |
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25 | var $error_no = false; |
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26 | var $error_msg = 'Unknown'; |
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27 | |
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28 | var $datatype_transformations = array( |
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29 | '%^(TINY|SMALL)INT( )?(\\([0-9]+\\))?( )?(UNSIGNED)?$%i' => 'SMALLINT', |
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30 | '%^(MEDIUM)?INT( )?(\\([0-9]+\\))?( )?(UNSIGNED)?$%i' => 'INTEGER', |
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31 | '%^BIGINT( )?(\\([0-9]+\\))?( )?(UNSIGNED)?$%i' => 'BIGINT', |
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32 | '%^(TINY|MEDIUM|LONG)?TEXT$%i' => 'TEXT', |
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33 | '%^DOUBLE( )?(\\([0-9,]+\\))?( )?(UNSIGNED)?$%i' => 'DOUBLE PRECISION', |
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34 | '%^FLOAT( )?(\\([0-9]+\\))?( )?(UNSIGNED)?$%i' => 'REAL' |
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35 | ); |
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36 | |
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37 | |
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38 | function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect) |
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39 | { |
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40 | $this->prefix = $db_prefix; |
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41 | |
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42 | if ($db_host) |
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43 | { |
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44 | if (strpos($db_host, ':') !== false) |
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45 | { |
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46 | list($db_host, $dbport) = explode(':', $db_host); |
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47 | $connect_str[] = 'host='.$db_host.' port='.$dbport; |
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48 | } |
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49 | else |
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50 | $connect_str[] = 'host='.$db_host; |
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51 | } |
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52 | |
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53 | if ($db_name) |
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54 | $connect_str[] = 'dbname='.$db_name; |
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55 | |
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56 | if ($db_username) |
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57 | $connect_str[] = 'user='.$db_username; |
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58 | |
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59 | if ($db_password) |
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60 | $connect_str[] = 'password='.$db_password; |
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61 | |
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62 | if ($p_connect) |
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63 | $this->link_id = @pg_pconnect(implode(' ', $connect_str)); |
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64 | else |
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65 | $this->link_id = @pg_connect(implode(' ', $connect_str)); |
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66 | |
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67 | if (!$this->link_id) |
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68 | error('Unable to connect to PostgreSQL server', __FILE__, __LINE__); |
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69 | |
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70 | // Setup the client-server character set (UTF-8) |
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71 | if (!defined('FORUM_NO_SET_NAMES')) |
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72 | $this->set_names('utf8'); |
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73 | |
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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 (@pg_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 (@pg_query($this->link_id, 'COMMIT')) |
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91 | return true; |
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92 | else |
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93 | { |
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94 | @pg_query($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) // $unbuffered is ignored since there is no pgsql_unbuffered_query() |
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101 | { |
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102 | if (strrpos($sql, 'LIMIT') !== false) |
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103 | $sql = preg_replace('%LIMIT ([0-9]+),([ 0-9]+)%', 'LIMIT \\2 OFFSET \\1', $sql); |
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104 | |
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105 | if (defined('PUN_SHOW_QUERIES')) |
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106 | $q_start = get_microtime(); |
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107 | |
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108 | @pg_send_query($this->link_id, $sql); |
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109 | $this->query_result = @pg_get_result($this->link_id); |
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110 | |
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111 | if (pg_result_status($this->query_result) != PGSQL_FATAL_ERROR) |
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112 | { |
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113 | if (defined('PUN_SHOW_QUERIES')) |
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114 | $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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115 | |
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116 | ++$this->num_queries; |
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117 | |
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118 | $this->last_query_text[$this->query_result] = $sql; |
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119 | |
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120 | return $this->query_result; |
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121 | } |
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122 | else |
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123 | { |
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124 | if (defined('PUN_SHOW_QUERIES')) |
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125 | $this->saved_queries[] = array($sql, 0); |
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126 | |
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127 | $this->error_no = false; |
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128 | $this->error_msg = @pg_result_error($this->query_result); |
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129 | |
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130 | if ($this->in_transaction) |
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131 | @pg_query($this->link_id, 'ROLLBACK'); |
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132 | |
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133 | --$this->in_transaction; |
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134 | |
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135 | return false; |
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136 | } |
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137 | } |
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138 | |
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139 | |
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140 | function result($query_id = 0, $row = 0, $col = 0) |
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141 | { |
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142 | return ($query_id) ? @pg_fetch_result($query_id, $row, $col) : false; |
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143 | } |
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144 | |
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145 | |
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146 | function fetch_assoc($query_id = 0) |
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147 | { |
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148 | return ($query_id) ? @pg_fetch_assoc($query_id) : false; |
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149 | } |
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150 | |
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151 | |
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152 | function fetch_row($query_id = 0) |
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153 | { |
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154 | return ($query_id) ? @pg_fetch_row($query_id) : false; |
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155 | } |
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156 | |
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157 | |
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158 | function num_rows($query_id = 0) |
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159 | { |
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160 | return ($query_id) ? @pg_num_rows($query_id) : false; |
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161 | } |
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162 | |
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163 | |
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164 | function affected_rows() |
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165 | { |
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166 | return ($this->query_result) ? @pg_affected_rows($this->query_result) : false; |
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167 | } |
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168 | |
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169 | |
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170 | function insert_id() |
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171 | { |
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172 | $query_id = $this->query_result; |
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173 | |
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174 | if ($query_id && $this->last_query_text[$query_id] != '') |
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175 | { |
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176 | if (preg_match('%^INSERT INTO ([a-z0-9\_\-]+)%is', $this->last_query_text[$query_id], $table_name)) |
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177 | { |
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178 | // Hack (don't ask) |
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179 | if (substr($table_name[1], -6) == 'groups') |
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180 | $table_name[1] .= '_g'; |
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181 | |
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182 | $temp_q_id = @pg_query($this->link_id, 'SELECT currval(\''.$table_name[1].'_id_seq\')'); |
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183 | return ($temp_q_id) ? intval(@pg_fetch_result($temp_q_id, 0)) : false; |
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184 | } |
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185 | } |
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186 | |
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187 | return false; |
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188 | } |
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189 | |
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190 | |
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191 | function get_num_queries() |
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192 | { |
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193 | return $this->num_queries; |
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194 | } |
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195 | |
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196 | |
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197 | function get_saved_queries() |
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198 | { |
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199 | return $this->saved_queries; |
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200 | } |
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201 | |
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202 | |
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203 | function free_result($query_id = false) |
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204 | { |
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205 | if (!$query_id) |
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206 | $query_id = $this->query_result; |
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207 | |
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208 | return ($query_id) ? @pg_free_result($query_id) : false; |
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209 | } |
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210 | |
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211 | |
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212 | function escape($str) |
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213 | { |
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214 | return is_array($str) ? '' : pg_escape_string($str); |
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215 | } |
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216 | |
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217 | |
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218 | function error() |
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219 | { |
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220 | $result['error_sql'] = @current(@end($this->saved_queries)); |
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221 | $result['error_no'] = $this->error_no; |
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222 | $result['error_msg'] = $this->error_msg; |
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223 | |
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224 | return $result; |
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225 | } |
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226 | |
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227 | |
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228 | function close() |
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229 | { |
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230 | if ($this->link_id) |
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231 | { |
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232 | if ($this->in_transaction) |
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233 | { |
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234 | if (defined('PUN_SHOW_QUERIES')) |
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235 | $this->saved_queries[] = array('COMMIT', 0); |
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236 | |
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237 | @pg_query($this->link_id, 'COMMIT'); |
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238 | } |
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239 | |
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240 | if ($this->query_result) |
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241 | @pg_free_result($this->query_result); |
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242 | |
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243 | return @pg_close($this->link_id); |
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244 | } |
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245 | else |
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246 | return false; |
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247 | } |
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248 | |
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249 | |
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250 | function get_names() |
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251 | { |
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252 | $result = $this->query('SHOW client_encoding'); |
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253 | return strtolower($this->result($result)); // MySQL returns lowercase so lets be consistent |
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254 | } |
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255 | |
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256 | |
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257 | function set_names($names) |
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258 | { |
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259 | return $this->query('SET NAMES \''.$this->escape($names).'\''); |
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260 | } |
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261 | |
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262 | |
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263 | function get_version() |
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264 | { |
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265 | $result = $this->query('SELECT VERSION()'); |
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266 | |
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267 | return array( |
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268 | 'name' => 'PostgreSQL', |
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269 | 'version' => preg_replace('%^[^0-9]+([^\s,-]+).*$%', '\\1', $this->result($result)) |
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270 | ); |
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271 | } |
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272 | |
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273 | |
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274 | function table_exists($table_name, $no_prefix = false) |
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275 | { |
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276 | $result = $this->query('SELECT 1 FROM pg_class WHERE relname = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\''); |
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277 | return $this->num_rows($result) > 0; |
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278 | } |
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279 | |
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280 | |
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281 | function field_exists($table_name, $field_name, $no_prefix = false) |
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282 | { |
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283 | $result = $this->query('SELECT 1 FROM pg_class c INNER JOIN pg_attribute a ON a.attrelid = c.oid WHERE c.relname = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND a.attname = \''.$this->escape($field_name).'\''); |
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284 | return $this->num_rows($result) > 0; |
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285 | } |
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286 | |
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287 | |
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288 | function index_exists($table_name, $index_name, $no_prefix = false) |
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289 | { |
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290 | $result = $this->query('SELECT 1 FROM pg_index i INNER JOIN pg_class c1 ON c1.oid = i.indrelid INNER JOIN pg_class c2 ON c2.oid = i.indexrelid WHERE c1.relname = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\' AND c2.relname = \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'_'.$this->escape($index_name).'\''); |
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291 | return $this->num_rows($result) > 0; |
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292 | } |
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293 | |
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294 | |
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295 | function create_table($table_name, $schema, $no_prefix = false) |
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296 | { |
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297 | if ($this->table_exists($table_name, $no_prefix)) |
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298 | return true; |
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299 | |
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300 | $query = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$table_name." (\n"; |
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301 | |
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302 | // Go through every schema element and add it to the query |
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303 | foreach ($schema['FIELDS'] as $field_name => $field_data) |
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304 | { |
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305 | $field_data['datatype'] = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_data['datatype']); |
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306 | |
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307 | $query .= $field_name.' '.$field_data['datatype']; |
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308 | |
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309 | // The SERIAL datatype is a special case where we don't need to say not null |
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310 | if (!$field_data['allow_null'] && $field_data['datatype'] != 'SERIAL') |
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311 | $query .= ' NOT NULL'; |
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312 | |
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313 | if (isset($field_data['default'])) |
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314 | $query .= ' DEFAULT '.$field_data['default']; |
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315 | |
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316 | $query .= ",\n"; |
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317 | } |
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318 | |
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319 | // If we have a primary key, add it |
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320 | if (isset($schema['PRIMARY KEY'])) |
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321 | $query .= 'PRIMARY KEY ('.implode(',', $schema['PRIMARY KEY']).'),'."\n"; |
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322 | |
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323 | // Add unique keys |
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324 | if (isset($schema['UNIQUE KEYS'])) |
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325 | { |
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326 | foreach ($schema['UNIQUE KEYS'] as $key_name => $key_fields) |
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327 | $query .= 'UNIQUE ('.implode(',', $key_fields).'),'."\n"; |
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328 | } |
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329 | |
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330 | // We remove the last two characters (a newline and a comma) and add on the ending |
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331 | $query = substr($query, 0, strlen($query) - 2)."\n".')'; |
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332 | |
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333 | $result = $this->query($query) ? true : false; |
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334 | |
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335 | // Add indexes |
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336 | if (isset($schema['INDEXES'])) |
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337 | { |
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338 | foreach ($schema['INDEXES'] as $index_name => $index_fields) |
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339 | $result &= $this->add_index($table_name, $index_name, $index_fields, false, $no_prefix); |
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340 | } |
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341 | |
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342 | return $result; |
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343 | } |
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344 | |
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345 | |
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346 | function drop_table($table_name, $no_prefix = false) |
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347 | { |
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348 | if (!$this->table_exists($table_name, $no_prefix)) |
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349 | return true; |
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350 | |
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351 | return $this->query('DROP TABLE '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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352 | } |
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353 | |
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354 | |
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355 | function rename_table($old_table, $new_table, $no_prefix = false) |
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356 | { |
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357 | // If there new table exists and the old one doesn't, then we're happy |
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358 | if ($this->table_exists($new_table, $no_prefix) && !$this->table_exists($old_table, $no_prefix)) |
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359 | return true; |
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360 | |
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361 | return $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$old_table.' RENAME TO '.($no_prefix ? '' : $this->prefix).$new_table) ? true : false; |
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362 | } |
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363 | |
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364 | |
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365 | function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null, $no_prefix = false) |
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366 | { |
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367 | if ($this->field_exists($table_name, $field_name, $no_prefix)) |
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368 | return true; |
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369 | |
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370 | $field_type = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_type); |
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371 | |
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372 | $result = $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' ADD '.$field_name.' '.$field_type) ? true : false; |
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373 | |
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374 | if ($default_value !== null) |
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375 | { |
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376 | if (!is_int($default_value) && !is_float($default_value)) |
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377 | $default_value = '\''.$this->escape($default_value).'\''; |
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378 | |
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379 | $result &= $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' ALTER '.$field_name.' SET DEFAULT '.$default_value) ? true : false; |
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380 | $result &= $this->query('UPDATE '.($no_prefix ? '' : $this->prefix).$table_name.' SET '.$field_name.'='.$default_value) ? true : false; |
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381 | } |
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382 | |
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383 | if (!$allow_null) |
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384 | $result &= $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' ALTER '.$field_name.' SET NOT NULL') ? true : false; |
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385 | |
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386 | return $result; |
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387 | } |
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388 | |
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389 | |
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390 | function alter_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null, $no_prefix = false) |
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391 | { |
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392 | if (!$this->field_exists($table_name, $field_name, $no_prefix)) |
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393 | return true; |
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394 | |
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395 | $field_type = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_type); |
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396 | |
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397 | $result = $this->add_field($table_name, 'tmp_'.$field_name, $field_type, $allow_null, $default_value, $after_field, $no_prefix); |
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398 | $result &= $this->query('UPDATE '.($no_prefix ? '' : $this->prefix).$table_name.' SET tmp_'.$field_name.' = '.$field_name) ? true : false; |
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399 | $result &= $this->drop_field($table_name, $field_name, $no_prefix); |
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400 | $result &= $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' RENAME COLUMN tmp_'.$field_name.' TO '.$field_name) ? true : false; |
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401 | |
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402 | return $result; |
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403 | } |
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404 | |
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405 | |
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406 | function drop_field($table_name, $field_name, $no_prefix = false) |
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407 | { |
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408 | if (!$this->field_exists($table_name, $field_name, $no_prefix)) |
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409 | return true; |
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410 | |
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411 | return $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' DROP '.$field_name) ? true : false; |
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412 | } |
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413 | |
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414 | |
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415 | function add_index($table_name, $index_name, $index_fields, $unique = false, $no_prefix = false) |
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416 | { |
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417 | if ($this->index_exists($table_name, $index_name, $no_prefix)) |
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418 | return true; |
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419 | |
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420 | return $this->query('CREATE '.($unique ? 'UNIQUE ' : '').'INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name.' ON '.($no_prefix ? '' : $this->prefix).$table_name.'('.implode(',', $index_fields).')') ? true : false; |
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421 | } |
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422 | |
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423 | |
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424 | function drop_index($table_name, $index_name, $no_prefix = false) |
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425 | { |
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426 | if (!$this->index_exists($table_name, $index_name, $no_prefix)) |
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427 | return true; |
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428 | |
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429 | return $this->query('DROP INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name) ? true : false; |
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430 | } |
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431 | |
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432 | function truncate_table($table_name, $no_prefix = false) |
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433 | { |
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434 | return $this->query('DELETE FROM '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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435 | } |
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436 | } |
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