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Derek Jonesb8c038a2011-08-20 08:57:14 -0500[diff] [blame^]31<td><h1>CodeIgniter User Guide Version 2.0.3</h1></td>
Derek Allard2067d1a2008-11-13 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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44<a href="http://codeigniter.com/">CodeIgniter Home</a> &nbsp;&#8250;&nbsp;
45<a href="../index.html">User Guide Home</a> &nbsp;&#8250;&nbsp;
46<a href="index.html">Database Library</a> &nbsp;&#8250;&nbsp;
47Database Example Code
48</td>
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60
61
62<h1>Database Quick Start: Example Code</h1>
63
Derek Jones4b9c6292011-07-01 17:40:48 -0500[diff] [blame]64<p>The following page contains example code showing how the database class is used. For complete details please
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]65read the individual pages describing each function.</p>
66
67
68<h2>Initializing the Database Class</h2>
69
70<p>The following code loads and initializes the database class based on your <a href="configuration.html">configuration</a> settings:</p>
71
72<code>$this->load->database();</code>
73
74<p>Once loaded the class is ready to be used as described below.</p>
75
Derek Jones4b9c6292011-07-01 17:40:48 -0500[diff] [blame]76<p>Note: If all your pages require database access you can connect automatically. See the <a href="connecting.html">connecting</a> page for details.</p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]77
78
79<h2>Standard Query With Multiple Results (Object Version)</h2>
80
81<code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br />
82<br />
83foreach ($query->result() as $row)<br />
84{<br />
85&nbsp;&nbsp;&nbsp;&nbsp;echo $row->title;<br />
86&nbsp;&nbsp;&nbsp;&nbsp;echo $row->name;<br />
87&nbsp;&nbsp;&nbsp;&nbsp;echo $row->email;<br />
88}<br />
89<br />
90echo 'Total Results: ' . $query->num_rows();
91</code>
92
Derek Jones4b9c6292011-07-01 17:40:48 -0500[diff] [blame]93<p>The above <dfn>result()</dfn> function returns an array of <strong>objects</strong>. Example: $row->title</p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]94
95
96<h2>Standard Query With Multiple Results (Array Version)</h2>
97
98<code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br />
99<br />
100foreach ($query->result_array() as $row)<br />
101{<br />
102&nbsp;&nbsp;&nbsp;&nbsp;echo $row['title'];<br />
103&nbsp;&nbsp;&nbsp;&nbsp;echo $row['name'];<br />
104&nbsp;&nbsp;&nbsp;&nbsp;echo $row['email'];<br />
105}</code>
106
Derek Jones4b9c6292011-07-01 17:40:48 -0500[diff] [blame]107<p>The above <dfn>result_array()</dfn> function returns an array of standard array indexes. Example: $row['title']</p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]108
109
110<h2>Testing for Results</h2>
111
112<p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test for a result first
113using the <dfn>num_rows()</dfn> function:</p>
114
115<code>
116$query = $this->db->query("YOUR QUERY");<br />
117<br />
118if ($query->num_rows() > 0)<br />
119{<br />
120&nbsp;&nbsp;&nbsp;foreach ($query->result() as $row)<br />
121&nbsp;&nbsp;&nbsp;{<br />
122&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo $row->title;<br />
123&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo $row->name;<br />
124&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo $row->body;<br />
125&nbsp;&nbsp;&nbsp;}<br />
126}
127</code>
128
129
130
131
132<h2>Standard Query With Single Result</h2>
133
134<code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br />
135<br />
136$row = $query->row();<br />
137echo $row->name;<br />
138</code>
139
Derek Jones4b9c6292011-07-01 17:40:48 -0500[diff] [blame]140<p>The above <dfn>row()</dfn> function returns an <strong>object</strong>. Example: $row->name</p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]141
142
143<h2>Standard Query With Single Result (Array version)</h2>
144
145<code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br />
146<br />
147$row = $query->row_array();<br />
148echo $row['name'];<br />
149</code>
150
Derek Jones4b9c6292011-07-01 17:40:48 -0500[diff] [blame]151<p>The above <dfn>row_array()</dfn> function returns an <strong>array</strong>. Example: $row['name']</p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]152
153
154<h2>Standard Insert</h2>
155
156<code>
157$sql = "INSERT INTO mytable (title, name) <br />
158&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;VALUES (".$this->db->escape($title).", ".$this->db->escape($name).")";<br />
159<br />
160$this->db->query($sql);<br />
161<br />
162echo $this->db->affected_rows();
163</code>
164
165
166
167
168<h2>Active Record Query</h2>
169
170<p>The <a href="active_record.html">Active Record Pattern</a> gives you a simplified means of retrieving data:</p>
171
172<code>
173$query = $this->db->get('table_name');<br />
174<br />
175foreach ($query->result() as $row)<br />
176{<br />
177&nbsp;&nbsp;&nbsp;&nbsp;echo $row->title;<br />
178}</code>
179
180<p>The above <dfn>get()</dfn> function retrieves all the results from the supplied table.
181The <a href="active_record.html">Active Record</a> class contains a full compliment of functions
182for working with data.</p>
183
184
185<h2>Active Record Insert</h2>
186
187<code>
188$data = array(<br />
189&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'title' => $title,<br />
190&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'name' => $name,<br />
191&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'date' => $date<br />
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;);<br />
193<br />
194$this->db->insert('mytable', $data);
195<br /><br />
196// Produces: INSERT INTO mytable (title, name, date) VALUES ('{$title}', '{$name}', '{$date}')</code>
197
198
199
200
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206<p>
207Previous Topic:&nbsp;&nbsp;<a href="index.html">Database Class</a>
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211Next Topic:&nbsp;&nbsp;<a href="configuration.html">Database Configuration</a>
212</p>
Derek Jones898949f2011-01-28 07:42:16 -0600[diff] [blame]213<p><a href="http://codeigniter.com">CodeIgniter</a> &nbsp;&middot;&nbsp; Copyright &#169; 2006 - 2011 &nbsp;&middot;&nbsp; <a href="http://ellislab.com/">EllisLab, Inc.</a></p>
Derek Allard2067d1a2008-11-13 22:59:24 +0000[diff] [blame]214</div>
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