Database Quick Start: Example Code — CodeIgniter 3.1.3 documentation

# 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}')