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.

Note

CodeIgniter doesn’t support dots (.) in the database, table, and column names.

Initializing the Database Class

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

<?php

$db = \Config\Database::connect();

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)

<?php

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

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

echo 'Total Results: ' . count($results);

The above getResult() function returns an array of objects.

Example: $row->title

Standard Query With Multiple Results (Array Version)

<?php

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

foreach ($results as $row) {
    echo $row['title'];
    echo $row['name'];
    echo $row['email'];
}

The above getResultArray() function returns an array of standard array indexes.

Example: $row['title']

Standard Query With Single Result

<?php

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

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

Standard Query With Single Result (Array version)

<?php

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

The above getRowArray() function returns an array. Example: $row['name'].

Standard Insert

<?php

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

Query Builder Query

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

<?php

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

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

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

Query Builder Insert

<?php

$data = [
    'title' => $title,
    'name'  => $name,
    'date'  => $date,
];

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