kanboard_ynh/sources/vendor/fguillot/picodb/README.md

PicoDb

PicoDb is a minimalist database query builder for PHP It's not an ORM.

Features

• No dependency
• Easy to use, fast and very lightweight
• Use prepared statements
• Handle schema versions (migrations)
• License: WTFPL

Requirements

• PHP >= 5.3
• PDO
• A database: Sqlite, Mysql or Postgresql

Todo

• Add driver for Postgresql
• Add support for Distinct...

Documentation

Connect to your database

use PicoDb\Database;

// Sqlite driver
$db = new Database(['driver' => 'sqlite', 'filename' => ':memory:']);

// Mysql driver
// Optional options: "schema_table" (the default table name is "schema_version")
$db = new Database(array(
    'driver' => 'mysql',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'my_db_name',
    'charset' => 'utf8',
));

Execute a SQL request

$db->execute('CREATE TABLE toto (column1 TEXT)');

Insert some data

$db->table('toto')->save(['column1' => 'hey']);

Transations

$db->transaction(function($db) {
    $db->table('toto')->save(['column1' => 'foo']);
    $db->table('toto')->save(['column1' => 'bar']);
});

Fetch all data

$records = $db->table('toto')->findAll();

foreach ($records as $record) {
    var_dump($record['column1']);
}

Update something

$db->table('toto')->eq('id', 1)->save(['column1' => 'hey']);

You just need to add a condition to perform an update.

Remove rows

$db->table('toto')->lowerThan('column1', 10)->remove();

Sorting

$db->table('toto')->asc('column1')->findAll();

or

$db->table('toto')->desc('column1')->findAll();

Limit and offset

$db->table('toto')->limit(10)->offset(5)->findAll();

Fetch only some columns

$db->table('toto')->columns('column1', 'column2')->findAll();

Conditions

Equals condition

$db->table('toto')
   ->equals('column1', 'hey')
   ->findAll();

or

$db->table('toto')
   ->eq('column1', 'hey')
   ->findAll();

Yout got: 'SELECT * FROM toto WHERE column1=?'

IN condition

$db->table('toto')
       ->in('column1', ['hey', 'bla'])
       ->findAll();

Like condition

$db->table('toto')
   ->like('column1', '%hey%')
   ->findAll();

Lower than

$db->table('toto')
   ->lowerThan('column1', 2)
   ->findAll();

or

$db->table('toto')
   ->lt('column1', 2)
   ->findAll();

Lower than or equals

$db->table('toto')
   ->lowerThanOrEquals('column1', 2)
   ->findAll();

or

$db->table('toto')
   ->lte('column1', 2)
   ->findAll();

Greater than

$db->table('toto')
   ->greaterThan('column1', 3)
   ->findAll();

or

$db->table('toto')
   ->gt('column1', 3)
   ->findAll();

Greater than or equals

$db->table('toto')
   ->greaterThanOrEquals('column1', 3)
   ->findAll();

or

$db->table('toto')
    ->gte('column1', 3)
    ->findAll();

Multiple conditions

Each condition is joined by a AND.

$db->table('toto')
    ->like('column2', '%toto')
    ->gte('column1', 3)
    ->findAll();

How to make a OR condition:

$db->table('toto')
    ->beginOr()
    ->like('column2', '%toto')
    ->gte('column1', 3)
    ->closeOr()
    ->eq('column5', 'titi')
    ->findAll();

Schema migrations

Define a migration

• Migrations are defined in simple functions inside a namespace named "Schema".
• An instance of PDO is passed to first argument of the function.
• Function names has the version number at the end.

Example:

namespace Schema;

function version_1($pdo)
{
    $pdo->exec('
        CREATE TABLE users (
            id INTEGER PRIMARY KEY,
            name TEXT UNIQUE,
            email TEXT UNIQUE,
            password TEXT
        )
    ');
}


function version_2($pdo)
{
    $pdo->exec('
        CREATE TABLE tags (
            id INTEGER PRIMARY KEY,
            name TEXT UNIQUE
        )
    ');
}

Run schema update automatically

• The method "check()" executes all migrations until to reach the correct version number.
• If we are already on the last version nothing will happen.
• The schema version for the driver Sqlite is stored inside a variable (PRAGMA user_version)
• You can use that with a dependency injection controller.

Example:

$last_schema_version = 5;

$db = new PicoDb\Database(array(
    'driver' => 'sqlite',
    'filename' => '/tmp/mydb.sqlite'
));

if ($db->schema()->check($last_schema_version)) {

    // Do something...
}
else {

    die('Unable to migrate database schema.');
}

Use a singleton to handle database instances

Setup a new instance:

PicoDb\Database::bootstrap('myinstance', function() {

    $db = new PicoDb\Database(array(
        'driver' => 'sqlite',
        'filename' => DB_FILENAME
    ));

    if ($db->schema()->check(DB_VERSION)) {
        return $db;
    }
    else {
        die('Unable to migrate database schema.');
    }
});

Get this instance anywhere in your code:

PicoDb\Database::get('myinstance')->table(...)