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admine0cd6092006-10-20 01:00:31 +000036<td><h1>Code Igniter User Guide Version 1.5.0b3</h1></td>
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admin24dd7e72006-10-01 19:02:29 +000051Database Utility Class
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admin24dd7e72006-10-01 19:02:29 +000065<h1>Database Utility Class</h1>
admin3b60ae42006-09-25 23:26:03 +000066
admin24dd7e72006-10-01 19:02:29 +000067<p>The Database Utility Class contains functions that help you manage your database.</p>
admin3b60ae42006-09-25 23:26:03 +000068
admin32cb0e52006-09-30 20:36:59 +000069<h3>Table of Contents</h3>
70
71<ul>
admin24dd7e72006-10-01 19:02:29 +000072<li><a href="#init">Initializing the Utility Class</a></li>
admin32cb0e52006-09-30 20:36:59 +000073<li><a href="#create">Creating a Database</a></li>
74<li><a href="#drop">Dropping a Database</a></li>
75<li><a href="#list">Listing your Databases</a></li>
76<li><a href="#opttb">Optimizing your Tables</a></li>
77<li><a href="#repair">Repairing your Databases</a></li>
78<li><a href="#optdb">Optimizing your Database</a></li>
admin24dd7e72006-10-01 19:02:29 +000079<li><a href="#csv">CSV Files from a Database Result</a></li>
admin32cb0e52006-09-30 20:36:59 +000080<li><a href="#xml">XML Files from a Database Result</a></li>
81<li><a href="#backup">Backing up your Database</a></li>
82</ul>
83
84
85<a name="init"></a>
admin24dd7e72006-10-01 19:02:29 +000086<h2>Initializing the Utility Class</h2>
admin32cb0e52006-09-30 20:36:59 +000087
adminfd2750b2006-10-06 17:29:12 +000088<p class="important"><strong>Important:</strong>&nbsp; In order to initialize the Utility class, your database driver must
admin572ed812006-10-12 18:01:52 +000089already be running, since the utilities class relies on it.</p>
admin3b60ae42006-09-25 23:26:03 +000090
adminfd2750b2006-10-06 17:29:12 +000091<p>Load the Utility Class as follows:</p>
admin3b60ae42006-09-25 23:26:03 +000092
admin572ed812006-10-12 18:01:52 +000093<code>$this->load->dbutil()</code>
admin3b60ae42006-09-25 23:26:03 +000094
95<p>Once initialized you will access the functions using the <dfn>$this->dbutil</dfn> object:</p>
96
97<code>$this->dbutil->some_function()</code>
98
99
100
admin32cb0e52006-09-30 20:36:59 +0000101<a name="create"></a>
admin3b60ae42006-09-25 23:26:03 +0000102<h2>$this->dbutil->create_database('db_name')</h2>
103
104<p>Permits you to create a database using the name specified in the first parameter. Returns TRUE/FALSE based on success or failure:</p>
105
106<code>if ($this->dbutil->create_database('my_db'))<br />
107{<br />
108&nbsp;&nbsp;&nbsp; echo 'Database created!';<br />
109}</code>
110
111
admin32cb0e52006-09-30 20:36:59 +0000112
113<a name="drop"></a>
admin3b60ae42006-09-25 23:26:03 +0000114<h2>$this->dbutil->drop_database('table_name')</h2>
115
116<p>Permits you to drop a database using the table name specified in the first parameter. Returns TRUE/FALSE based on success or failure:</p>
117
118<code>if ($this->dbutil->drop_database('my_db'))<br />
119{<br />
120&nbsp;&nbsp;&nbsp; echo 'Database deleted!';<br />
121}</code>
122
123
admin32cb0e52006-09-30 20:36:59 +0000124<a name="list"></a>
admin3b60ae42006-09-25 23:26:03 +0000125<h2>$this->dbutil->list_databases()</h2>
admin3b60ae42006-09-25 23:26:03 +0000126<p>Returns an array of database names:</p>
127
128
129<code>
130$dbs = $this->dbutil->list_databases();<br />
131<br />
132foreach($dbs as $db)<br />
133{<br />
134&nbsp;&nbsp;&nbsp; echo $db;<br />
135}</code>
136
137
admin32cb0e52006-09-30 20:36:59 +0000138<a name="opttb"></a>
admin3b60ae42006-09-25 23:26:03 +0000139<h2>$this->dbutil->optimize_table('table_name');</h2>
140
adminf66de862006-10-10 23:30:04 +0000141<p class="important"><strong>Note:</strong>&nbsp; This features is only available for MySQL/MySQLi databases.</p>
142
143
admin3b60ae42006-09-25 23:26:03 +0000144<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>
145
146<code>
147if ($this->dbutil->optimize_table('table_name'))<br />
148{<br />
adminf66de862006-10-10 23:30:04 +0000149&nbsp;&nbsp;&nbsp; echo 'Success!';<br />
admin3b60ae42006-09-25 23:26:03 +0000150}
151</code>
152
153<p><strong>Note:</strong> Not all database platforms support table optimization.</p>
154
155
admin32cb0e52006-09-30 20:36:59 +0000156<a name="repair"></a>
admin3b60ae42006-09-25 23:26:03 +0000157<h2>$this->dbutil->repair_table('table_name');</h2>
158
adminf66de862006-10-10 23:30:04 +0000159<p class="important"><strong>Note:</strong>&nbsp; This features is only available for MySQL/MySQLi databases.</p>
160
161
admin3b60ae42006-09-25 23:26:03 +0000162<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>
163
164<code>
165if ($this->dbutil->optimize_table('table_name'))<br />
166{<br />
adminf66de862006-10-10 23:30:04 +0000167&nbsp;&nbsp;&nbsp; echo 'Success!';<br />
admin3b60ae42006-09-25 23:26:03 +0000168}
169</code>
170
171<p><strong>Note:</strong> Not all database platforms support table repairs.</p>
172
173
admin32cb0e52006-09-30 20:36:59 +0000174<a name="optdb"></a>
admine5bb9362006-09-27 00:31:22 +0000175<h2>$this->dbutil->optimize_database();</h2>
176
adminf66de862006-10-10 23:30:04 +0000177<p class="important"><strong>Note:</strong>&nbsp; This features is only available for MySQL/MySQLi databases.</p>
178
admine5bb9362006-09-27 00:31:22 +0000179<p>Permits you to optimize the database your DB class is currently connected to. Returns an array containing the returned status messages or FALSE on failure.</p>
180
181<code>
adminf66de862006-10-10 23:30:04 +0000182$result = $this->dbutil->optimize_database();<br />
admine5bb9362006-09-27 00:31:22 +0000183<br />
184if ($result !== FALSE)<br />
185{<br />
186&nbsp;&nbsp;&nbsp; print_r($result);<br />
187}
188</code>
189
190<p><strong>Note:</strong> Not all database platforms support table optimization.</p>
admin3b60ae42006-09-25 23:26:03 +0000191
192
admin24dd7e72006-10-01 19:02:29 +0000193<a name="csv"></a>
194<h2>$this->dbutil->csv_from_result($db_result)</h2>
admin3ed8c512006-09-29 23:26:28 +0000195
admin24dd7e72006-10-01 19:02:29 +0000196<p>Permits you to generate a CSV file from a query result. The first parameter of the function must contain the result object from your query.
admin3ed8c512006-09-29 23:26:28 +0000197Example:</p>
198
199<code>
200$this->load->dbutil();<br />
201<br />
202$query = $this->db->query("SELECT * FROM mytable");<br />
203<br />
admin24dd7e72006-10-01 19:02:29 +0000204echo $this->dbutil->csv_from_result($query);
admin3ed8c512006-09-29 23:26:28 +0000205</code>
206
207<p>The second and third parameters allows you to
208set the delimiter and newline character. By default tabs are used as the delimiter and "\n" is used as a new line. Example:
209
210<code>
211$delimiter = ",";<br />
212$newline = "\r\n";<br />
213<br />
admin24dd7e72006-10-01 19:02:29 +0000214echo $this->dbutil->csv_from_result($query, $delimiter, $newline);
admin3ed8c512006-09-29 23:26:28 +0000215</code>
216
adminf66de862006-10-10 23:30:04 +0000217<p><strong>Important:</strong>&nbsp; This function will NOT write the CSV file for you. It simply creates the CSV layout.
admin3ed8c512006-09-29 23:26:28 +0000218If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p>
219
220
admin32cb0e52006-09-30 20:36:59 +0000221<a name="xml"></a>
admin3ed8c512006-09-29 23:26:28 +0000222<h2>$this->dbutil->xml_from_result($db_result)</h2>
223
224<p>Permits you to generate an XML file from a query result. The first parameter expects a query result object, the second
225may contain an optional array of config parameters. Example:</p>
226
227<code>
228$this->load->dbutil();<br />
229<br />
230$query = $this->db->query("SELECT * FROM mytable");<br />
231<br />
232$config = array (<br />
233&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'root'&nbsp;&nbsp;&nbsp; => 'root',<br />
234&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'element' => 'element', <br />
235&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'newline' => "\n", <br />
adminc5f7fa32006-10-06 02:10:23 +0000236&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'tab'&nbsp;&nbsp;&nbsp;&nbsp;=> "\t"<br />
admin3ed8c512006-09-29 23:26:28 +0000237&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />
238<br />
admin24dd7e72006-10-01 19:02:29 +0000239echo $this->dbutil->xml_from_result($query, $config);
admin3ed8c512006-09-29 23:26:28 +0000240</code>
241
adminf66de862006-10-10 23:30:04 +0000242<p><strong>Important:</strong>&nbsp; This function will NOT write the XML file for you. It simply creates the XML layout.
admin3ed8c512006-09-29 23:26:28 +0000243If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p>
244
245
admin32cb0e52006-09-30 20:36:59 +0000246<a name="backup"></a>
247<h2>$this->dbutil->backup()</h2>
admin3dd978f2006-09-30 19:24:45 +0000248
admine856ff42006-10-02 02:38:30 +0000249<p>Permits you to backup your full database or individual tables. The backup data can be compressed in either Zip or Gzip format.</p>
admin0e425542006-10-01 03:37:43 +0000250
adminf66de862006-10-10 23:30:04 +0000251<p class="important"><strong>Note:</strong>&nbsp; This features is only available for MySQL/MySQLi databases.</p>
252
admin0e425542006-10-01 03:37:43 +0000253<p>Note: Due to the limited execution time and memory available to PHP, backing up very large
254databases may not be possible. If your database is very large you might need to backup directly from your SQL server
255via the command line, or have your server admin do it for you if you do not have root privileges.</p>
256
admine856ff42006-10-02 02:38:30 +0000257<h3>Usage Example</h3>
admin3ed8c512006-09-29 23:26:28 +0000258
admine856ff42006-10-02 02:38:30 +0000259<code>
260<dfn>// Load the DB utility class</dfn><br />
261$this->load->dbutil();<br /><br />
262
adminc5f7fa32006-10-06 02:10:23 +0000263<dfn>// Backup your entire database and assign it to a variable</dfn><br />
admine856ff42006-10-02 02:38:30 +0000264$backup =& $this->dbutil->backup();
265
266<br /><br />
267<dfn>// Load the file helper and write the file to your server</dfn><br />
268$this->load->helper('file');<br />
269write_file('/path/to/mybackup.gz', $backup);
270
271<br /><br />
272<dfn>// Load the download helper and send the file to your desktop</dfn><br />
273$this->load->helper('download');<br />
274force_download('mybackup.gz', $backup);
admin32cb0e52006-09-30 20:36:59 +0000275</code>
admin3ed8c512006-09-29 23:26:28 +0000276
admin32cb0e52006-09-30 20:36:59 +0000277<h3>Setting Backup Preferences</h3>
278
admine856ff42006-10-02 02:38:30 +0000279<p>Backup preferences are set by submitting an array of values to the first parameter of the backup function. Example:</p>
admin32cb0e52006-09-30 20:36:59 +0000280
281<code>$prefs = array(<br />
282&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'tables'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=> array('table1', 'table2'),&nbsp;&nbsp;// Array of tables to backup.<br />
admine856ff42006-10-02 02:38:30 +0000283&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'ignore'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=> array(),&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// List of tables to omit from the backup<br />
284&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'format'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=> 'txt',&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// gzip, zip, txt<br />
285&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'filename'&nbsp;&nbsp;&nbsp;&nbsp;=> 'mybackup.sql',&nbsp;&nbsp;&nbsp;&nbsp;// File name - NEEDED ONLY WITH ZIP FILES<br />
286&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'add_drop'&nbsp;&nbsp;&nbsp;&nbsp;=> TRUE,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Whether to add DROP TABLE statements to backup file<br />
287&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'add_insert'&nbsp;&nbsp;=> TRUE,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Whether to add INSERT data to backup file<br />
288&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'newline'&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=> "\n"&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Newline character used in backup file<br />
admin32cb0e52006-09-30 20:36:59 +0000289&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />
290<br />
291$this->dbutil->backup($prefs);
292</code>
293
admin0e425542006-10-01 03:37:43 +0000294
admin32cb0e52006-09-30 20:36:59 +0000295<h3>Description of Backup Preferences</h3>
296
297<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder">
298<tr>
299<th>Preference</th>
300<th>Default&nbsp;Value</th>
301<th>Options</th>
302<th>Description</th>
303</tr><tr>
admine856ff42006-10-02 02:38:30 +0000304<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>
admin32cb0e52006-09-30 20:36:59 +0000305</tr><tr>
admine856ff42006-10-02 02:38:30 +0000306<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>
admin32cb0e52006-09-30 20:36:59 +0000307</tr><tr>
308<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>
309</tr><tr>
admine856ff42006-10-02 02:38:30 +0000310<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>
admin32cb0e52006-09-30 20:36:59 +0000311</tr><tr>
312<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>
313</tr><tr>
admin40037182006-10-11 19:16:58 +0000314<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>
admin32cb0e52006-09-30 20:36:59 +0000315</tr><tr>
admin40037182006-10-11 19:16:58 +0000316<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>
admin32cb0e52006-09-30 20:36:59 +0000317
318</tr>
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320
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