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| Database Example Code | |
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| <h1>Database Quick Start: Example Code</h1> | |
| <p>The following page contains example code showing how the database class is used. For complete details please | |
| read the individual pages describing each function.</p> | |
| <h2>Initializing the Database Class</h2> | |
| <p>The following code loads and initializes the database class based on your <a href="configuration.html">configuration</a> settings:</p> | |
| <code>$this->load->database();</code> | |
| <p>Once loaded the class is ready to be used as described below.</p> | |
| <p>Note: If all your pages require database access you can connect automatically. See the <a href="connecting.html">connecting</a> page for details.</p> | |
| <h2>Standard Query With Multiple Results (Object Version)</h2> | |
| <code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br /> | |
| <br /> | |
| foreach ($query->result() as $row)<br /> | |
| {<br /> | |
| echo $row->title;<br /> | |
| echo $row->name;<br /> | |
| echo $row->email;<br /> | |
| }<br /> | |
| <br /> | |
| echo 'Total Results: ' . $query->num_rows(); | |
| </code> | |
| <p>The above <dfn>result()</dfn> function returns an array of <strong>objects</strong>. Example: $row->title</p> | |
| <h2>Standard Query With Multiple Results (Array Version)</h2> | |
| <code>$query = $this->db->query('SELECT name, title, email FROM my_table');<br /> | |
| <br /> | |
| foreach ($query->result_array() as $row)<br /> | |
| {<br /> | |
| echo $row['title'];<br /> | |
| echo $row['name'];<br /> | |
| echo $row['email'];<br /> | |
| }</code> | |
| <p>The above <dfn>result_array()</dfn> function returns an array of standard array indexes. Example: $row['title']</p> | |
| <h2>Testing for Results</h2> | |
| <p>If you run queries that might <strong>not</strong> produce a result, you are encouraged to test for a result first | |
| using the <dfn>num_rows()</dfn> function:</p> | |
| <code> | |
| $query = $this->db->query("YOUR QUERY");<br /> | |
| <br /> | |
| if ($query->num_rows() > 0)<br /> | |
| {<br /> | |
| foreach ($query->result() as $row)<br /> | |
| {<br /> | |
| echo $row->title;<br /> | |
| echo $row->name;<br /> | |
| echo $row->body;<br /> | |
| }<br /> | |
| } | |
| </code> | |
| <h2>Standard Query With Single Result</h2> | |
| <code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br /> | |
| <br /> | |
| $row = $query->row();<br /> | |
| echo $row->name;<br /> | |
| </code> | |
| <p>The above <dfn>row()</dfn> function returns an <strong>object</strong>. Example: $row->name</p> | |
| <h2>Standard Query With Single Result (Array version)</h2> | |
| <code>$query = $this->db->query('SELECT name FROM my_table LIMIT 1');<br /> | |
| <br /> | |
| $row = $query->row_array();<br /> | |
| echo $row['name'];<br /> | |
| </code> | |
| <p>The above <dfn>row_array()</dfn> function returns an <strong>array</strong>. Example: $row['name']</p> | |
| <h2>Standard Insert</h2> | |
| <code> | |
| $sql = "INSERT INTO mytable (title, name) <br /> | |
| VALUES (".$this->db->escape($title).", ".$this->db->escape($name).")";<br /> | |
| <br /> | |
| $this->db->query($sql);<br /> | |
| <br /> | |
| echo $this->db->affected_rows(); | |
| </code> | |
| <h2>Active Record Query</h2> | |
| <p>The <a href="active_record.html">Active Record Pattern</a> gives you a simplified means of retrieving data:</p> | |
| <code> | |
| $query = $this->db->get('table_name');<br /> | |
| <br /> | |
| foreach ($query->result() as $row)<br /> | |
| {<br /> | |
| echo $row->title;<br /> | |
| }</code> | |
| <p>The above <dfn>get()</dfn> function retrieves all the results from the supplied table. | |
| The <a href="active_record.html">Active Record</a> class contains a full compliment of functions | |
| for working with data.</p> | |
| <h2>Active Record Insert</h2> | |
| <code> | |
| $data = array(<br /> | |
| 'title' => $title,<br /> | |
| 'name' => $name,<br /> | |
| 'date' => $date<br /> | |
| );<br /> | |
| <br /> | |
| $this->db->insert('mytable', $data); | |
| <br /><br /> | |
| // Produces: INSERT INTO mytable (title, name, date) VALUES ('{$title}', '{$name}', '{$date}')</code> | |
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