D2O
, (*1)
, (*2)
Installation
Use Composer., (*3)
composer require knj/d2o
D2O from PDO
If D2O, you can use PDO and PDOStatement with only 1 statement using method chaining:, (*4)
$d2o = new Wazly\D2O($dsh, $username, $password);
$sql = 'SELECT * FROM users WHERE id = :id'
$row = $d2o
->state($sql)
->run([':id' => 3])
->pick();
otherwise need to $dbh as PDO and $stmt as PDOStatement and at least 3 statements are required:, (*5)
$dbh = new PDO($dsh, $username, $password);
$sql = 'SELECT * FROM users WHERE id = :id';
$stmt = $dbh->prepare($sql);
$stmt->execute([':id' => 3]);
$row = $stmt->fetch(PDO::FETCH_OBJ);
Methods
state ( string $statement )
D2O::state() is to be called by D2O directly. It is almost the same as PDO::prepare() but returns D2O instance itself., (*6)
$d2o->state($sql); // returns $d2o
bind ( [ array $parameters [, string $bind_type = 'value' ] ] )
D2O::bind() is to be called after D2O::state(). It is similar to PDOStatement::bindValue() but returns D2O instance., (*7)
$d2o->state($sql)
->bind([
':role' => $role,
':limit' => [$limit, 'int'],
]); // returns $d2o
run ( [ array $parameters [, string $bind_type = 'value' ] ] )
D2O::run() is to be called after D2O::state(). It is similar to PDOStatement::execute() but returns D2O instance., (*8)
$d2o->state($sql)
->bind([
':role' => $role,
':limit' => [$limit, 'int'],
])
->run(); // returns $d2o
$d2o->state($sql)
->run([
':role' => $role,
':limit' => [$limit, 'int'],
]); // the same as the above
pick ( string $fetch_style )
D2O::pick() is to be called after D2O::run(). It is almost the same as PDOStatement::fetch(). It does not return the instance but query result., (*9)
$row = $d2o->state($sql)
->run([
':role' => $role,
':limit' => [1, 'int'],
])
->pick(); // recommended if the number of rows is supposed to be 1
$result = $d2o->state($sql)
->run([
':role' => $role,
':limit' => [$limit, 'int'],
]); // recommended if the number of rows is supposed to be 2 or more
$row1 = $result->pick();
$row2 = $result->pick();
$row3 = $result->pick();
D2O::format() is to be called after D2O::run(). It is almost the same as PDOStatement::fetchAll(). It does not return the instance but query result., (*10)
$rows = $d2o->state($sql)
->run([
':role' => $role,
':limit' => [$limit, 'int'],
])
->format();
getStatement()
D2O::getStatement() returns PDOStatement object in D2O. To give an example, you can use PDOStatement::fetchAll() with it instead of D2O::format()., (*11)
$rows = $d2o->state($sql)->run()->getStatement()->fetchAll();
Differences between D2O and PDO
PDOStatement lies inside of D2O
Using PDO, extra variable is required to contain PDOStatement instance.
However, D2O has PDOStatement as its property so that it can provide method chaining., (*12)
Example of sequential insertion:, (*13)
$d2o->state('INSERT INTO items(name, price) VALUES (:name, :price)')
->run(['name' => 'pencil', 'price' => 20])
->run(['name' => 'eraser', 'price' => 60])
->run(['name' => 'notebook', 'price' => 100]);
Data binding
D2O saves coding when you bind values on placeholders:, (*14)
$d2o->bind([
'role' => 'editor', // ':role' => 'editor', PDO::PARAM_STR
'limit' => 20, // ':limit' => 20, PDO::PARAM_INT
'hash' => '6293', // ':hash' => '6293', PDO::PARAM_STR
'id' => [36, 'str'], // ':id' => 36, PDO::PARAM_STR
]);
- You don't have to use colons
- You don't have to
PDO_PARAM_* when the value is string, integer, or null
- You can specify data type more concisely, like
'str' instead of PDO::PARAM_STR
And D2O never calls PDOStatement::bindParam()., (*15)
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