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Database Utility Class
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<h1>Database Utility Class</h1>
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<p>The Database Utility Class contains functions that help you manage your database.</p>
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<h3>Table of Contents</h3>
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<li><a href="#init">Initializing the Utility Class</a></li>
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<li><a href="#list">Listing your Databases</a></li>
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<li><a href="#exists">Checking for a specific Database</a></li>
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<li><a href="#opttb">Optimizing your Tables</a></li>
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<li><a href="#repair">Repairing your Databases</a></li>
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<li><a href="#optdb">Optimizing your Database</a></li>
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<li><a href="#csv">CSV Files from a Database Result</a></li>
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<li><a href="#xml">XML Files from a Database Result</a></li>
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<li><a href="#backup">Backing up your Database</a></li>
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<h2><a name="init"></a>Initializing the Utility Class</h2>
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<p class="important"><strong>Important:</strong> In order to initialize the Utility class, your database driver must
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already be running, since the utilities class relies on it.</p>
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<p>Load the Utility Class as follows:</p>
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<code>$this->load->dbutil()</code>
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<p>Once initialized you will access the functions using the <dfn>$this->dbutil</dfn> object:</p>
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<code>$this->dbutil->some_function()</code>
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<h2><a name="list"></a>$this->dbutil->list_databases()</h2>
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<p>Returns an array of database names:</p>
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$dbs = $this->dbutil->list_databases();<br />
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foreach ($dbs as $db)<br />
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echo $db;<br />
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<h2><a name="exists"></a>$this->dbutil->database_exists();</h2>
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<p>Sometimes it's helpful to know whether a particular database exists.
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Returns a boolean TRUE/FALSE. Usage example:</p>
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if ($this->dbutil->database_exists('database_name'))<br />
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// some code...<br />
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<p>Note: Replace <em>database_name</em> with the name of the table you are looking for. This function is case sensitive.</p>
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<h2><a name="opttb"></a>$this->dbutil->optimize_table('table_name');</h2>
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<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p>
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<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>
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if ($this->dbutil->optimize_table('table_name'))<br />
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echo 'Success!';<br />
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<p><strong>Note:</strong> Not all database platforms support table optimization.</p>
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<h2><a name="repair"></a>$this->dbutil->repair_table('table_name');</h2>
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<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p>
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<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>
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if ($this->dbutil->repair_table('table_name'))<br />
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echo 'Success!';<br />
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<p><strong>Note:</strong> Not all database platforms support table repairs.</p>
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<h2><a name="optdb"></a>$this->dbutil->optimize_database();</h2>
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<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p>
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<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>
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$result = $this->dbutil->optimize_database();<br />
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if ($result !== FALSE)<br />
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print_r($result);<br />
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<p><strong>Note:</strong> Not all database platforms support table optimization.</p>
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<h2><a name="csv"></a>$this->dbutil->csv_from_result($db_result)</h2>
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<p>Permits you to generate a CSV file from a query result. The first parameter of the function must contain the result object from your query.
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$this->load->dbutil();<br />
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$query = $this->db->query("SELECT * FROM mytable");<br />
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echo $this->dbutil->csv_from_result($query);
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<p>The second and third parameters allows you to
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set the delimiter and newline character. By default tabs are used as the delimiter and "\n" is used as a new line. Example:</p>
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$delimiter = ",";<br />
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$newline = "\r\n";<br />
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echo $this->dbutil->csv_from_result($query, $delimiter, $newline);
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<p><strong>Important:</strong> This function will NOT write the CSV file for you. It simply creates the CSV layout.
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If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p>
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<h2><a name="xml"></a>$this->dbutil->xml_from_result($db_result)</h2>
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<p>Permits you to generate an XML file from a query result. The first parameter expects a query result object, the second
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may contain an optional array of config parameters. Example:</p>
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$this->load->dbutil();<br />
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$query = $this->db->query("SELECT * FROM mytable");<br />
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$config = array (<br />
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'root' => 'root',<br />
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'element' => 'element', <br />
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'newline' => "\n", <br />
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'tab' => "\t"<br />
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);<br />
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echo $this->dbutil->xml_from_result($query, $config);
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<p><strong>Important:</strong> This function will NOT write the XML file for you. It simply creates the XML layout.
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If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p>
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<h2><a name="backup"></a>$this->dbutil->backup()</h2>
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<p>Permits you to backup your full database or individual tables. The backup data can be compressed in either Zip or Gzip format.</p>
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<p class="important"><strong>Note:</strong> This features is only available for MySQL databases.</p>
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<p>Note: Due to the limited execution time and memory available to PHP, backing up very large
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databases may not be possible. If your database is very large you might need to backup directly from your SQL server
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via the command line, or have your server admin do it for you if you do not have root privileges.</p>
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<h3>Usage Example</h3>
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<dfn>// Load the DB utility class</dfn><br />
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$this->load->dbutil();<br /><br />
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<dfn>// Backup your entire database and assign it to a variable</dfn><br />
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$backup =& $this->dbutil->backup();
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<dfn>// Load the file helper and write the file to your server</dfn><br />
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$this->load->helper('file');<br />
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write_file('/path/to/mybackup.gz', $backup);
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<dfn>// Load the download helper and send the file to your desktop</dfn><br />
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$this->load->helper('download');<br />
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force_download('mybackup.gz', $backup);
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<h3>Setting Backup Preferences</h3>
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<p>Backup preferences are set by submitting an array of values to the first parameter of the backup function. Example:</p>
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<code>$prefs = array(<br />
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'tables' => array('table1', 'table2'), // Array of tables to backup.<br />
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'ignore' => array(), // List of tables to omit from the backup<br />
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'format' => 'txt', // gzip, zip, txt<br />
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'filename' => 'mybackup.sql', // File name - NEEDED ONLY WITH ZIP FILES<br />
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'add_drop' => TRUE, // Whether to add DROP TABLE statements to backup file<br />
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'add_insert' => TRUE, // Whether to add INSERT data to backup file<br />
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'newline' => "\n" // Newline character used in backup file<br />
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);<br />
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$this->dbutil->backup($prefs);
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<h3>Description of Backup Preferences</h3>
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<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder">
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<th>Default Value</th>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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