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| Derek Jones | 733310d | 2009-02-11 01:13:43 +0000 | [diff] [blame^] | 31 | <td><h1>CodeIgniter User Guide Version 1.7.1</h1></td> |
| Derek Allard | 2067d1a | 2008-11-13 22:59:24 +0000 | [diff] [blame] | 32 | <td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td> |
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| 46 | Database Utility Class |
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| 59 | |
| 60 | <h1>Database Utility Class</h1> |
| 61 | |
| 62 | <p>The Database Utility Class contains functions that help you manage your database.</p> |
| 63 | |
| 64 | <h3>Table of Contents</h3> |
| 65 | |
| 66 | <ul> |
| 67 | <li><a href="#init">Initializing the Utility Class</a></li> |
| 68 | <li><a href="#list">Listing your Databases</a></li> |
| 69 | <li><a href="#opttb">Optimizing your Tables</a></li> |
| 70 | <li><a href="#repair">Repairing your Databases</a></li> |
| 71 | <li><a href="#optdb">Optimizing your Database</a></li> |
| 72 | <li><a href="#csv">CSV Files from a Database Result</a></li> |
| 73 | <li><a href="#xml">XML Files from a Database Result</a></li> |
| 74 | <li><a href="#backup">Backing up your Database</a></li> |
| 75 | </ul> |
| 76 | |
| 77 | |
| 78 | |
| 79 | <h2><a name="init"></a>Initializing the Utility Class</h2> |
| 80 | |
| 81 | <p class="important"><strong>Important:</strong> In order to initialize the Utility class, your database driver must |
| 82 | already be running, since the utilities class relies on it.</p> |
| 83 | |
| 84 | <p>Load the Utility Class as follows:</p> |
| 85 | |
| 86 | <code>$this->load->dbutil()</code> |
| 87 | |
| 88 | <p>Once initialized you will access the functions using the <dfn>$this->dbutil</dfn> object:</p> |
| 89 | |
| 90 | <code>$this->dbutil->some_function()</code> |
| 91 | |
| 92 | <h2><a name="list"></a>$this->dbutil->list_databases()</h2> |
| 93 | <p>Returns an array of database names:</p> |
| 94 | |
| 95 | <code> |
| 96 | $dbs = $this->dbutil->list_databases();<br /> |
| 97 | <br /> |
| 98 | foreach($dbs as $db)<br /> |
| 99 | {<br /> |
| 100 | echo $db;<br /> |
| 101 | }</code> |
| 102 | <h2><a name="opttb"></a>$this->dbutil->optimize_table('table_name');</h2> |
| 103 | |
| 104 | <p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p> |
| 105 | |
| 106 | |
| 107 | <p>Permits you to optimize a table using the table name specified in the first parameter. Returns TRUE/FALSE based on success or failure:</p> |
| 108 | |
| 109 | <code> |
| 110 | if ($this->dbutil->optimize_table('table_name'))<br /> |
| 111 | {<br /> |
| 112 | echo 'Success!';<br /> |
| 113 | } |
| 114 | </code> |
| 115 | |
| 116 | <p><strong>Note:</strong> Not all database platforms support table optimization.</p> |
| 117 | |
| 118 | |
| 119 | <h2><a name="repair"></a>$this->dbutil->repair_table('table_name');</h2> |
| 120 | |
| 121 | <p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p> |
| 122 | |
| 123 | |
| 124 | <p>Permits you to repair a table using the table name specified in the first parameter. Returns TRUE/FALSE based on success or failure:</p> |
| 125 | |
| 126 | <code> |
| 127 | if ($this->dbutil->repair_table('table_name'))<br /> |
| 128 | {<br /> |
| 129 | echo 'Success!';<br /> |
| 130 | } |
| 131 | </code> |
| 132 | |
| 133 | <p><strong>Note:</strong> Not all database platforms support table repairs.</p> |
| 134 | |
| 135 | |
| 136 | <h2><a name="optdb"></a>$this->dbutil->optimize_database();</h2> |
| 137 | |
| 138 | <p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p> |
| 139 | |
| 140 | <p>Permits you to optimize the database your DB class is currently connected to. Returns an array containing the DB status messages or FALSE on failure.</p> |
| 141 | |
| 142 | <code> |
| 143 | $result = $this->dbutil->optimize_database();<br /> |
| 144 | <br /> |
| 145 | if ($result !== FALSE)<br /> |
| 146 | {<br /> |
| 147 | print_r($result);<br /> |
| 148 | } |
| 149 | </code> |
| 150 | |
| 151 | <p><strong>Note:</strong> Not all database platforms support table optimization.</p> |
| 152 | |
| 153 | |
| 154 | <h2><a name="csv"></a>$this->dbutil->csv_from_result($db_result)</h2> |
| 155 | |
| 156 | <p>Permits you to generate a CSV file from a query result. The first parameter of the function must contain the result object from your query. |
| 157 | Example:</p> |
| 158 | |
| 159 | <code> |
| 160 | $this->load->dbutil();<br /> |
| 161 | <br /> |
| 162 | $query = $this->db->query("SELECT * FROM mytable");<br /> |
| 163 | <br /> |
| 164 | echo $this->dbutil->csv_from_result($query); |
| 165 | </code> |
| 166 | |
| 167 | <p>The second and third parameters allows you to |
| 168 | set the delimiter and newline character. By default tabs are used as the delimiter and "\n" is used as a new line. Example:</p> |
| 169 | |
| 170 | <code> |
| 171 | $delimiter = ",";<br /> |
| 172 | $newline = "\r\n";<br /> |
| 173 | <br /> |
| 174 | echo $this->dbutil->csv_from_result($query, $delimiter, $newline); |
| 175 | </code> |
| 176 | |
| 177 | <p><strong>Important:</strong> This function will NOT write the CSV file for you. It simply creates the CSV layout. |
| 178 | If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p> |
| 179 | |
| 180 | |
| 181 | <h2><a name="xml"></a>$this->dbutil->xml_from_result($db_result)</h2> |
| 182 | |
| 183 | <p>Permits you to generate an XML file from a query result. The first parameter expects a query result object, the second |
| 184 | may contain an optional array of config parameters. Example:</p> |
| 185 | |
| 186 | <code> |
| 187 | $this->load->dbutil();<br /> |
| 188 | <br /> |
| 189 | $query = $this->db->query("SELECT * FROM mytable");<br /> |
| 190 | <br /> |
| 191 | $config = array (<br /> |
| 192 | 'root' => 'root',<br /> |
| 193 | 'element' => 'element', <br /> |
| 194 | 'newline' => "\n", <br /> |
| 195 | 'tab' => "\t"<br /> |
| 196 | );<br /> |
| 197 | <br /> |
| 198 | echo $this->dbutil->xml_from_result($query, $config); |
| 199 | </code> |
| 200 | |
| 201 | <p><strong>Important:</strong> This function will NOT write the XML file for you. It simply creates the XML layout. |
| 202 | If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p> |
| 203 | |
| 204 | |
| 205 | <h2><a name="backup"></a>$this->dbutil->backup()</h2> |
| 206 | |
| 207 | <p>Permits you to backup your full database or individual tables. The backup data can be compressed in either Zip or Gzip format.</p> |
| 208 | |
| 209 | <p class="important"><strong>Note:</strong> This features is only available for MySQL databases.</p> |
| 210 | |
| 211 | <p>Note: Due to the limited execution time and memory available to PHP, backing up very large |
| 212 | databases may not be possible. If your database is very large you might need to backup directly from your SQL server |
| 213 | via the command line, or have your server admin do it for you if you do not have root privileges.</p> |
| 214 | |
| 215 | <h3>Usage Example</h3> |
| 216 | |
| 217 | <code> |
| 218 | <dfn>// Load the DB utility class</dfn><br /> |
| 219 | $this->load->dbutil();<br /><br /> |
| 220 | |
| 221 | <dfn>// Backup your entire database and assign it to a variable</dfn><br /> |
| 222 | $backup =& $this->dbutil->backup(); |
| 223 | |
| 224 | <br /><br /> |
| 225 | <dfn>// Load the file helper and write the file to your server</dfn><br /> |
| 226 | $this->load->helper('file');<br /> |
| 227 | write_file('/path/to/mybackup.gz', $backup); |
| 228 | |
| 229 | <br /><br /> |
| 230 | <dfn>// Load the download helper and send the file to your desktop</dfn><br /> |
| 231 | $this->load->helper('download');<br /> |
| 232 | force_download('mybackup.gz', $backup); |
| 233 | </code> |
| 234 | |
| 235 | <h3>Setting Backup Preferences</h3> |
| 236 | |
| 237 | <p>Backup preferences are set by submitting an array of values to the first parameter of the backup function. Example:</p> |
| 238 | |
| 239 | <code>$prefs = array(<br /> |
| 240 | 'tables' => array('table1', 'table2'), // Array of tables to backup.<br /> |
| 241 | 'ignore' => array(), // List of tables to omit from the backup<br /> |
| 242 | 'format' => 'txt', // gzip, zip, txt<br /> |
| 243 | 'filename' => 'mybackup.sql', // File name - NEEDED ONLY WITH ZIP FILES<br /> |
| 244 | 'add_drop' => TRUE, // Whether to add DROP TABLE statements to backup file<br /> |
| 245 | 'add_insert' => TRUE, // Whether to add INSERT data to backup file<br /> |
| 246 | 'newline' => "\n" // Newline character used in backup file<br /> |
| 247 | );<br /> |
| 248 | <br /> |
| 249 | $this->dbutil->backup($prefs); |
| 250 | </code> |
| 251 | |
| 252 | |
| 253 | <h3>Description of Backup Preferences</h3> |
| 254 | |
| 255 | <table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder"> |
| 256 | <tr> |
| 257 | <th>Preference</th> |
| 258 | <th>Default Value</th> |
| 259 | <th>Options</th> |
| 260 | <th>Description</th> |
| 261 | </tr><tr> |
| 262 | <td class="td"><strong>tables</strong></td><td class="td">empty array</td><td class="td">None</td><td class="td">An array of tables you want backed up. If left blank all tables will be exported.</td> |
| 263 | </tr><tr> |
| 264 | <td class="td"><strong>ignore</strong></td><td class="td">empty array</td><td class="td">None</td><td class="td">An array of tables you want the backup routine to ignore.</td> |
| 265 | </tr><tr> |
| 266 | <td class="td"><strong>format</strong></td><td class="td">gzip</td><td class="td">gzip, zip, txt</td><td class="td">The file format of the export file.</td> |
| 267 | </tr><tr> |
| 268 | <td class="td"><strong>filename</strong></td><td class="td">the current date/time</td><td class="td">None</td><td class="td">The name of the backed-up file. The name is needed only if you are using zip compression.</td> |
| 269 | </tr><tr> |
| 270 | <td class="td"><strong>add_drop</strong></td><td class="td">TRUE</td><td class="td">TRUE/FALSE</td><td class="td">Whether to include DROP TABLE statements in your SQL export file.</td> |
| 271 | </tr><tr> |
| 272 | <td class="td"><strong>add_insert</strong></td><td class="td">TRUE</td><td class="td">TRUE/FALSE</td><td class="td">Whether to include INSERT statements in your SQL export file.</td> |
| 273 | </tr><tr> |
| 274 | <td class="td"><strong>newline</strong></td><td class="td">"\n"</td><td class="td">"\n", "\r", "\r\n"</td><td class="td">Type of newline to use in your SQL export file.</td> |
| 275 | |
| 276 | </tr> |
| 277 | </table> |
| 278 | |
| 279 | |
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