Database Quick Start: Example Code CodeIgniter

Database Quick Start: Example Code

The following page contains example code showing how the database class is used. For complete details please read the individual pages describing each function.

Initializing the Database Class

The following code loads and initializes the database class based on your configuration settings:

$this->load->database();

Once loaded the class is ready to be used as described below.

Note: If all your pages require database access you can connect automatically. See the connecting page for details.

Standard Query With Multiple Results (Object Version)

$query = $this->db->query('SELECT name, title, email FROM my_table');

foreach ($query->result() as $row)
{
        echo $row->title;
        echo $row->name;
        echo $row->email;
}

echo 'Total Results: ' . $query->num_rows();

The above result() function returns an array of objects. Example: $row->title

Standard Query With Multiple Results (Array Version)

$query = $this->db->query('SELECT name, title, email FROM my_table');

foreach ($query->result_array() as $row)
{
        echo $row['title'];
        echo $row['name'];
        echo $row['email'];
}
The above result_array() function returns an array of standard array indexes. Example: $row[‘title’]

Standard Query With Single Result

$query = $this->db->query('SELECT name FROM my_table LIMIT 1');
$row = $query->row();
echo $row->name;

The above row() function returns an object. Example: $row->name

Standard Query With Single Result (Array version)

$query = $this->db->query('SELECT name FROM my_table LIMIT 1');
$row = $query->row_array();
echo $row['name'];

The above row_array() function returns an array. Example: $row[‘name’]

Standard Insert

$sql = "INSERT INTO mytable (title, name) VALUES (".$this->db->escape($title).", ".$this->db->escape($name).")";
$this->db->query($sql);
echo $this->db->affected_rows();

Query Builder Query

The Query Builder Pattern gives you a simplified means of retrieving data:

$query = $this->db->get('table_name');

foreach ($query->result() as $row) { echo $row->title; }

The above get() function retrieves all the results from the supplied table. The Query Builder class contains a full compliment of functions for working with data.

Query Builder Insert

$data = array(
        'title' => $title,
        'name' => $name,
        'date' => $date
);

$this->db->insert('mytable', $data);  // Produces: INSERT INTO mytable (title, name, date) VALUES ('{$title}', '{$name}', '{$date}')