Skip to content
Navigation Menu
{{ message }}
This repository was archived by the owner on Nov 26, 2020. It is now read-only.
forked from bcit-ci/CodeIgniter
-
Notifications
You must be signed in to change notification settings - Fork 18
Expand file tree
/
Copy pathutilities.html
More file actions
314 lines (228 loc) · 13.5 KB
/
Copy pathutilities.html
File metadata and controls
314 lines (228 loc) · 13.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Database Utility Class : CodeIgniter User Guide</title>
<style type='text/css' media='all'>@import url('../userguide.css');</style>
<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
<script type="text/javascript" src="../nav/nav.js"></script>
<script type="text/javascript" src="../nav/prototype.lite.js"></script>
<script type="text/javascript" src="../nav/moo.fx.js"></script>
<script type="text/javascript" src="../nav/user_guide_menu.js"></script>
<meta http-equiv='expires' content='-1' />
<meta http-equiv= 'pragma' content='no-cache' />
<meta name='robots' content='all' />
<meta name='author' content='ExpressionEngine Dev Team' />
<meta name='description' content='CodeIgniter User Guide' />
</head>
<body>
<!-- START NAVIGATION -->
<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle_darker.jpg" width="154" height="43" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
<div id="masthead">
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<tr>
<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td>
<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
</tr>
</table>
</div>
<!-- END NAVIGATION -->
<!-- START BREADCRUMB -->
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<tr>
<td id="breadcrumb">
<a href="http://codeigniter.com/">CodeIgniter Home</a> ›
<a href="../index.html">User Guide Home</a> ›
<a href="index.html">Database Library</a> ›
Database Utility Class
</td>
<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
</tr>
</table>
<!-- END BREADCRUMB -->
<br clear="all" />
<!-- START CONTENT -->
<div id="content">
<h1>Database Utility Class</h1>
<p>The Database Utility Class contains functions that help you manage your database.</p>
<h3>Table of Contents</h3>
<ul>
<li><a href="#init">Initializing the Utility Class</a></li>
<li><a href="#list">Listing your Databases</a></li>
<li><a href="#exists">Checking for a specific Database</a></li>
<li><a href="#opttb">Optimizing your Tables</a></li>
<li><a href="#repair">Repairing your Databases</a></li>
<li><a href="#optdb">Optimizing your Database</a></li>
<li><a href="#csv">CSV Files from a Database Result</a></li>
<li><a href="#xml">XML Files from a Database Result</a></li>
<li><a href="#backup">Backing up your Database</a></li>
</ul>
<h2><a name="init"></a>Initializing the Utility Class</h2>
<p class="important"><strong>Important:</strong> In order to initialize the Utility class, your database driver must
already be running, since the utilities class relies on it.</p>
<p>Load the Utility Class as follows:</p>
<code>$this->load->dbutil()</code>
<p>Once initialized you will access the functions using the <dfn>$this->dbutil</dfn> object:</p>
<code>$this->dbutil->some_function()</code>
<h2><a name="list"></a>$this->dbutil->list_databases()</h2>
<p>Returns an array of database names:</p>
<code>
$dbs = $this->dbutil->list_databases();<br />
<br />
foreach ($dbs as $db)<br />
{<br />
echo $db;<br />
}</code>
<h2><a name="exists"></a>$this->dbutil->database_exists();</h2>
<p>Sometimes it's helpful to know whether a particular database exists.
Returns a boolean TRUE/FALSE. Usage example:</p>
<code>
if ($this->dbutil->database_exists('database_name'))<br />
{<br />
// some code...<br />
}
</code>
<p>Note: Replace <em>database_name</em> with the name of the table you are looking for. This function is case sensitive.</p>
<h2><a name="opttb"></a>$this->dbutil->optimize_table('table_name');</h2>
<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p>
<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>
<code>
if ($this->dbutil->optimize_table('table_name'))<br />
{<br />
echo 'Success!';<br />
}
</code>
<p><strong>Note:</strong> Not all database platforms support table optimization.</p>
<h2><a name="repair"></a>$this->dbutil->repair_table('table_name');</h2>
<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p>
<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>
<code>
if ($this->dbutil->repair_table('table_name'))<br />
{<br />
echo 'Success!';<br />
}
</code>
<p><strong>Note:</strong> Not all database platforms support table repairs.</p>
<h2><a name="optdb"></a>$this->dbutil->optimize_database();</h2>
<p class="important"><strong>Note:</strong> This features is only available for MySQL/MySQLi databases.</p>
<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>
<code>
$result = $this->dbutil->optimize_database();<br />
<br />
if ($result !== FALSE)<br />
{<br />
print_r($result);<br />
}
</code>
<p><strong>Note:</strong> Not all database platforms support table optimization.</p>
<h2><a name="csv"></a>$this->dbutil->csv_from_result($db_result)</h2>
<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.
Example:</p>
<code>
$this->load->dbutil();<br />
<br />
$query = $this->db->query("SELECT * FROM mytable");<br />
<br />
echo $this->dbutil->csv_from_result($query);
</code>
<p>The second and third parameters allows you to
set the delimiter and newline character. By default tabs are used as the delimiter and "\n" is used as a new line. Example:</p>
<code>
$delimiter = ",";<br />
$newline = "\r\n";<br />
<br />
echo $this->dbutil->csv_from_result($query, $delimiter, $newline);
</code>
<p><strong>Important:</strong> This function will NOT write the CSV file for you. It simply creates the CSV layout.
If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p>
<h2><a name="xml"></a>$this->dbutil->xml_from_result($db_result)</h2>
<p>Permits you to generate an XML file from a query result. The first parameter expects a query result object, the second
may contain an optional array of config parameters. Example:</p>
<code>
$this->load->dbutil();<br />
<br />
$query = $this->db->query("SELECT * FROM mytable");<br />
<br />
$config = array (<br />
'root' => 'root',<br />
'element' => 'element', <br />
'newline' => "\n", <br />
'tab' => "\t"<br />
);<br />
<br />
echo $this->dbutil->xml_from_result($query, $config);
</code>
<p><strong>Important:</strong> This function will NOT write the XML file for you. It simply creates the XML layout.
If you need to write the file use the <a href="../helpers/file_helper.html">File Helper</a>.</p>
<h2><a name="backup"></a>$this->dbutil->backup()</h2>
<p>Permits you to backup your full database or individual tables. The backup data can be compressed in either Zip or Gzip format.</p>
<p class="important"><strong>Note:</strong> This features is only available for MySQL databases.</p>
<p>Note: Due to the limited execution time and memory available to PHP, backing up very large
databases may not be possible. If your database is very large you might need to backup directly from your SQL server
via the command line, or have your server admin do it for you if you do not have root privileges.</p>
<h3>Usage Example</h3>
<code>
<dfn>// Load the DB utility class</dfn><br />
$this->load->dbutil();<br /><br />
<dfn>// Backup your entire database and assign it to a variable</dfn><br />
$backup =& $this->dbutil->backup();
<br /><br />
<dfn>// Load the file helper and write the file to your server</dfn><br />
$this->load->helper('file');<br />
write_file('/path/to/mybackup.gz', $backup);
<br /><br />
<dfn>// Load the download helper and send the file to your desktop</dfn><br />
$this->load->helper('download');<br />
force_download('mybackup.gz', $backup);
</code>
<h3>Setting Backup Preferences</h3>
<p>Backup preferences are set by submitting an array of values to the first parameter of the backup function. Example:</p>
<code>$prefs = array(<br />
'tables' => array('table1', 'table2'), // Array of tables to backup.<br />
'ignore' => array(), // List of tables to omit from the backup<br />
'format' => 'txt', // gzip, zip, txt<br />
'filename' => 'mybackup.sql', // File name - NEEDED ONLY WITH ZIP FILES<br />
'add_drop' => TRUE, // Whether to add DROP TABLE statements to backup file<br />
'add_insert' => TRUE, // Whether to add INSERT data to backup file<br />
'newline' => "\n" // Newline character used in backup file<br />
);<br />
<br />
$this->dbutil->backup($prefs);
</code>
<h3>Description of Backup Preferences</h3>
<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder">
<tr>
<th>Preference</th>
<th>Default Value</th>
<th>Options</th>
<th>Description</th>
</tr><tr>
<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>
</tr><tr>
<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>
</tr><tr>
<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>
</tr><tr>
<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>
</tr><tr>
<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>
</tr><tr>
<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>
</tr><tr>
<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>
</tr>
</table>
</div>
<!-- END CONTENT -->
<div id="footer">
<p>
Previous Topic: <a href="forge.html">DB Forge Class</a>
·
<a href="#top">Top of Page</a> ·
<a href="../index.html">User Guide Home</a> ·
Next Topic: <a href="../libraries/javascript.html">Javascript Class</a></p>
<p><a href="http://codeigniter.com">CodeIgniter</a> · Copyright © 2006 - 2011 · <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
</div>
</body>
</html>
You can’t perform that action at this time.