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 MySQL |
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10 | if (!function_exists('mysqli_connect')) |
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11 | exit('This PHP environment doesn\'t have Improved MySQL (mysqli) support built in. Improved MySQL support is required if you want to use a MySQL 4.1 (or later) 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 | |
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20 | var $saved_queries = array(); |
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21 | var $num_queries = 0; |
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22 | var $in_transaction = 0; |
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23 | |
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24 | var $error_no = false; |
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25 | var $error_msg = 'Unknown'; |
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26 | |
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27 | var $datatype_transformations = array( |
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28 | '%^SERIAL$%' => 'INT(10) UNSIGNED AUTO_INCREMENT' |
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29 | ); |
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30 | |
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31 | |
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32 | function DBLayer($db_host, $db_username, $db_password, $db_name, $db_prefix, $p_connect) |
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33 | { |
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34 | $this->prefix = $db_prefix; |
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35 | |
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36 | // Was a custom port supplied with $db_host? |
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37 | if (strpos($db_host, ':') !== false) |
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38 | list($db_host, $db_port) = explode(':', $db_host); |
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39 | |
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40 | // Persistent connection in MySQLi are only available in PHP 5.3 and later releases |
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41 | $p_connect = $p_connect && version_compare(PHP_VERSION, '5.3.0', '>=') ? 'p:' : ''; |
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42 | |
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43 | if (isset($db_port)) |
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44 | $this->link_id = @mysqli_connect($p_connect.$db_host, $db_username, $db_password, $db_name, $db_port); |
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45 | else |
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46 | $this->link_id = @mysqli_connect($p_connect.$db_host, $db_username, $db_password, $db_name); |
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47 | |
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48 | if (!$this->link_id) |
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49 | error('Unable to connect to MySQL and select database. MySQL reported: '.mysqli_connect_error(), __FILE__, __LINE__); |
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50 | |
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51 | // Setup the client-server character set (UTF-8) |
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52 | if (!defined('FORUM_NO_SET_NAMES')) |
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53 | $this->set_names('utf8'); |
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54 | |
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55 | return $this->link_id; |
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56 | } |
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57 | |
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58 | |
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59 | function start_transaction() |
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60 | { |
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61 | ++$this->in_transaction; |
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62 | |
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63 | mysqli_query($this->link_id, 'START TRANSACTION'); |
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64 | return; |
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65 | } |
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66 | |
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67 | |
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68 | function end_transaction() |
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69 | { |
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70 | --$this->in_transaction; |
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71 | |
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72 | mysqli_query($this->link_id, 'COMMIT'); |
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73 | return; |
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74 | } |
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75 | |
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76 | |
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77 | function query($sql, $unbuffered = false) |
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78 | { |
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79 | if (defined('PUN_SHOW_QUERIES')) |
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80 | $q_start = get_microtime(); |
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81 | |
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82 | $this->query_result = @mysqli_query($this->link_id, $sql); |
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83 | |
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84 | if ($this->query_result) |
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85 | { |
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86 | if (defined('PUN_SHOW_QUERIES')) |
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87 | $this->saved_queries[] = array($sql, sprintf('%.5f', get_microtime() - $q_start)); |
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88 | |
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89 | ++$this->num_queries; |
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90 | |
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91 | return $this->query_result; |
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92 | } |
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93 | else |
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94 | { |
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95 | if (defined('PUN_SHOW_QUERIES')) |
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96 | $this->saved_queries[] = array($sql, 0); |
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97 | |
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98 | $this->error_no = @mysqli_errno($this->link_id); |
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99 | $this->error_msg = @mysqli_error($this->link_id); |
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100 | |
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101 | // Rollback transaction |
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102 | if ($this->in_transaction) |
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103 | mysqli_query($this->link_id, 'ROLLBACK'); |
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104 | |
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105 | --$this->in_transaction; |
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106 | |
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107 | return false; |
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108 | } |
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109 | } |
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110 | |
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111 | |
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112 | function result($query_id = 0, $row = 0, $col = 0) |
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113 | { |
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114 | if ($query_id) |
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115 | { |
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116 | if ($row !== 0 && @mysqli_data_seek($query_id, $row) === false) |
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117 | return false; |
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118 | |
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119 | $cur_row = @mysqli_fetch_row($query_id); |
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120 | if ($cur_row === false) |
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121 | return false; |
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122 | |
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123 | return $cur_row[$col]; |
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124 | } |
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125 | else |
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126 | return false; |
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127 | } |
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128 | |
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129 | |
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130 | function fetch_assoc($query_id = 0) |
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131 | { |
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132 | return ($query_id) ? @mysqli_fetch_assoc($query_id) : false; |
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133 | } |
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134 | |
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135 | |
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136 | function fetch_row($query_id = 0) |
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137 | { |
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138 | return ($query_id) ? @mysqli_fetch_row($query_id) : false; |
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139 | } |
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140 | |
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141 | |
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142 | function num_rows($query_id = 0) |
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143 | { |
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144 | return ($query_id) ? @mysqli_num_rows($query_id) : false; |
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145 | } |
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146 | |
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147 | |
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148 | function affected_rows() |
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149 | { |
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150 | return ($this->link_id) ? @mysqli_affected_rows($this->link_id) : false; |
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151 | } |
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152 | |
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153 | |
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154 | function insert_id() |
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155 | { |
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156 | return ($this->link_id) ? @mysqli_insert_id($this->link_id) : false; |
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157 | } |
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158 | |
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159 | |
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160 | function get_num_queries() |
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161 | { |
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162 | return $this->num_queries; |
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163 | } |
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164 | |
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165 | |
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166 | function get_saved_queries() |
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167 | { |
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168 | return $this->saved_queries; |
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169 | } |
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170 | |
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171 | |
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172 | function free_result($query_id = false) |
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173 | { |
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174 | return ($query_id) ? @mysqli_free_result($query_id) : false; |
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175 | } |
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176 | |
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177 | |
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178 | function escape($str) |
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179 | { |
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180 | return is_array($str) ? '' : mysqli_real_escape_string($this->link_id, $str); |
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181 | } |
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182 | |
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183 | |
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184 | function error() |
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185 | { |
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186 | $result['error_sql'] = @current(@end($this->saved_queries)); |
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187 | $result['error_no'] = $this->error_no; |
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188 | $result['error_msg'] = $this->error_msg; |
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189 | |
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190 | return $result; |
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191 | } |
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192 | |
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193 | |
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194 | function close() |
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195 | { |
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196 | if ($this->link_id) |
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197 | { |
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198 | if ($this->query_result) |
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199 | @mysqli_free_result($this->query_result); |
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200 | |
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201 | return @mysqli_close($this->link_id); |
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202 | } |
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203 | else |
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204 | return false; |
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205 | } |
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206 | |
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207 | |
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208 | function get_names() |
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209 | { |
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210 | $result = $this->query('SHOW VARIABLES LIKE \'character_set_connection\''); |
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211 | return $this->result($result, 0, 1); |
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212 | } |
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213 | |
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214 | |
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215 | function set_names($names) |
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216 | { |
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217 | return $this->query('SET NAMES \''.$this->escape($names).'\''); |
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218 | } |
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219 | |
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220 | |
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221 | function get_version() |
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222 | { |
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223 | $result = $this->query('SELECT VERSION()'); |
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224 | |
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225 | return array( |
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226 | 'name' => 'MySQL Improved (InnoDB)', |
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227 | 'version' => preg_replace('%^([^-]+).*$%', '\\1', $this->result($result)) |
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228 | ); |
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229 | } |
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230 | |
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231 | |
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232 | function table_exists($table_name, $no_prefix = false) |
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233 | { |
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234 | $result = $this->query('SHOW TABLES LIKE \''.($no_prefix ? '' : $this->prefix).$this->escape($table_name).'\''); |
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235 | return $this->num_rows($result) > 0; |
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236 | } |
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237 | |
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238 | |
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239 | function field_exists($table_name, $field_name, $no_prefix = false) |
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240 | { |
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241 | $result = $this->query('SHOW COLUMNS FROM '.($no_prefix ? '' : $this->prefix).$table_name.' LIKE \''.$this->escape($field_name).'\''); |
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242 | return $this->num_rows($result) > 0; |
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243 | } |
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244 | |
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245 | |
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246 | function index_exists($table_name, $index_name, $no_prefix = false) |
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247 | { |
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248 | $exists = false; |
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249 | |
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250 | $result = $this->query('SHOW INDEX FROM '.($no_prefix ? '' : $this->prefix).$table_name); |
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251 | while ($cur_index = $this->fetch_assoc($result)) |
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252 | { |
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253 | if (strtolower($cur_index['Key_name']) == strtolower(($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name)) |
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254 | { |
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255 | $exists = true; |
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256 | break; |
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257 | } |
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258 | } |
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259 | |
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260 | return $exists; |
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261 | } |
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262 | |
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263 | |
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264 | function create_table($table_name, $schema, $no_prefix = false) |
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265 | { |
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266 | if ($this->table_exists($table_name, $no_prefix)) |
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267 | return true; |
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268 | |
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269 | $query = 'CREATE TABLE '.($no_prefix ? '' : $this->prefix).$table_name." (\n"; |
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270 | |
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271 | // Go through every schema element and add it to the query |
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272 | foreach ($schema['FIELDS'] as $field_name => $field_data) |
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273 | { |
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274 | $field_data['datatype'] = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_data['datatype']); |
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275 | |
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276 | $query .= $field_name.' '.$field_data['datatype']; |
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277 | |
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278 | if (isset($field_data['collation'])) |
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279 | $query .= 'CHARACTER SET utf8 COLLATE utf8_'.$field_data['collation']; |
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280 | |
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281 | if (!$field_data['allow_null']) |
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282 | $query .= ' NOT NULL'; |
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283 | |
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284 | if (isset($field_data['default'])) |
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285 | $query .= ' DEFAULT '.$field_data['default']; |
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286 | |
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287 | $query .= ",\n"; |
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288 | } |
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289 | |
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290 | // If we have a primary key, add it |
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291 | if (isset($schema['PRIMARY KEY'])) |
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292 | $query .= 'PRIMARY KEY ('.implode(',', $schema['PRIMARY KEY']).'),'."\n"; |
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293 | |
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294 | // Add unique keys |
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295 | if (isset($schema['UNIQUE KEYS'])) |
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296 | { |
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297 | foreach ($schema['UNIQUE KEYS'] as $key_name => $key_fields) |
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298 | $query .= 'UNIQUE KEY '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$key_name.'('.implode(',', $key_fields).'),'."\n"; |
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299 | } |
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300 | |
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301 | // Add indexes |
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302 | if (isset($schema['INDEXES'])) |
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303 | { |
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304 | foreach ($schema['INDEXES'] as $index_name => $index_fields) |
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305 | $query .= 'KEY '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name.'('.implode(',', $index_fields).'),'."\n"; |
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306 | } |
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307 | |
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308 | // We remove the last two characters (a newline and a comma) and add on the ending |
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309 | $query = substr($query, 0, strlen($query) - 2)."\n".') ENGINE = '.(isset($schema['ENGINE']) ? $schema['ENGINE'] : 'InnoDB').' CHARACTER SET utf8'; |
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310 | |
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311 | return $this->query($query) ? true : false; |
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312 | } |
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313 | |
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314 | |
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315 | function drop_table($table_name, $no_prefix = false) |
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316 | { |
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317 | if (!$this->table_exists($table_name, $no_prefix)) |
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318 | return true; |
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319 | |
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320 | return $this->query('DROP TABLE '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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321 | } |
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322 | |
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323 | |
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324 | function rename_table($old_table, $new_table, $no_prefix = false) |
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325 | { |
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326 | // If there new table exists and the old one doesn't, then we're happy |
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327 | if ($this->table_exists($new_table, $no_prefix) && !$this->table_exists($old_table, $no_prefix)) |
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328 | return true; |
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329 | |
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330 | 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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331 | } |
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332 | |
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333 | |
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334 | function add_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null, $no_prefix = false) |
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335 | { |
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336 | if ($this->field_exists($table_name, $field_name, $no_prefix)) |
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337 | return true; |
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338 | |
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339 | $field_type = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_type); |
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340 | |
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341 | if ($default_value !== null && !is_int($default_value) && !is_float($default_value)) |
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342 | $default_value = '\''.$this->escape($default_value).'\''; |
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343 | |
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344 | return $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' ADD '.$field_name.' '.$field_type.($allow_null ? ' ' : ' NOT NULL').($default_value !== null ? ' DEFAULT '.$default_value : ' ').($after_field != null ? ' AFTER '.$after_field : '')) ? true : false; |
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345 | } |
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346 | |
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347 | |
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348 | function alter_field($table_name, $field_name, $field_type, $allow_null, $default_value = null, $after_field = null, $no_prefix = false) |
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349 | { |
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350 | if (!$this->field_exists($table_name, $field_name, $no_prefix)) |
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351 | return true; |
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352 | |
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353 | $field_type = preg_replace(array_keys($this->datatype_transformations), array_values($this->datatype_transformations), $field_type); |
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354 | |
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355 | if ($default_value !== null && !is_int($default_value) && !is_float($default_value)) |
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356 | $default_value = '\''.$this->escape($default_value).'\''; |
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357 | |
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358 | return $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' MODIFY '.$field_name.' '.$field_type.($allow_null ? ' ' : ' NOT NULL').($default_value !== null ? ' DEFAULT '.$default_value : ' ').($after_field != null ? ' AFTER '.$after_field : '')) ? true : false; |
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359 | } |
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360 | |
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361 | |
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362 | function drop_field($table_name, $field_name, $no_prefix = false) |
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363 | { |
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364 | if (!$this->field_exists($table_name, $field_name, $no_prefix)) |
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365 | return true; |
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366 | |
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367 | return $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' DROP '.$field_name) ? true : false; |
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368 | } |
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369 | |
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370 | |
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371 | function add_index($table_name, $index_name, $index_fields, $unique = false, $no_prefix = false) |
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372 | { |
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373 | if ($this->index_exists($table_name, $index_name, $no_prefix)) |
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374 | return true; |
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375 | |
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376 | return $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' ADD '.($unique ? 'UNIQUE ' : '').'INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name.' ('.implode(',', $index_fields).')') ? true : false; |
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377 | } |
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378 | |
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379 | |
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380 | function drop_index($table_name, $index_name, $no_prefix = false) |
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381 | { |
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382 | if (!$this->index_exists($table_name, $index_name, $no_prefix)) |
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383 | return true; |
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384 | |
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385 | return $this->query('ALTER TABLE '.($no_prefix ? '' : $this->prefix).$table_name.' DROP INDEX '.($no_prefix ? '' : $this->prefix).$table_name.'_'.$index_name) ? true : false; |
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386 | } |
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387 | |
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388 | function truncate_table($table_name, $no_prefix = false) |
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389 | { |
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390 | return $this->query('TRUNCATE TABLE '.($no_prefix ? '' : $this->prefix).$table_name) ? true : false; |
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391 | } |
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392 | } |
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