SQLite3::__construct
(PHP 5 >= 5.3.0, PHP 7)
SQLite3::__construct — Instantiates an SQLite3 object and opens an SQLite 3 database
Описание
$filename
[, int $flags = SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE
[, string $encryption_key = null
]] )Instantiates an SQLite3 object and opens a connection to an SQLite 3 database. If the build includes encryption, then it will attempt to use the key.
Список параметров
-
filename -
Path to the SQLite database, or :memory: to use in-memory database.
-
flags -
Optional flags used to determine how to open the SQLite database. By default, open uses SQLITE3_OPEN_READWRITE | SQLITE3_OPEN_CREATE.
-
SQLITE3_OPEN_READONLY: Open the database for reading only.
-
SQLITE3_OPEN_READWRITE: Open the database for reading and writing.
-
SQLITE3_OPEN_CREATE: Create the database if it does not exist.
-
-
encryption_key -
An optional encryption key used when encrypting and decrypting an SQLite database. If the SQLite encryption module is not installed, this parameter will have no effect.
Возвращаемые значения
Returns an SQLite3 object on success.
Ошибки
Throws an Exception on failure.
Примеры
Пример #1 SQLite3::__construct() example
<?php
$db = new SQLite3('mysqlitedb.db');
$db->exec('CREATE TABLE foo (bar STRING)');
$db->exec("INSERT INTO foo (bar) VALUES ('This is a test')");
$result = $db->query('SELECT bar FROM foo');
var_dump($result->fetchArray());
?>
- PHP Руководство
- Функции по категориям
- Индекс функций
- Справочник функций
- Расширения для работы с базами данных
- Расширения для работы с базами данных отдельных производителей
- SQLite3
- Функция SQLite3::busyTimeout() - Sets the busy connection handler
- SQLite3::changes
- Функция SQLite3::close() - Closes the database connection
- Функция SQLite3::__construct() - Instantiates an SQLite3 object and opens an SQLite 3 database
- Функция SQLite3::createAggregate() - Registers a PHP function for use as an SQL aggregate function
- Функция SQLite3::createCollation() - Registers a PHP function for use as an SQL collating function
- Функция SQLite3::createFunction() - Registers a PHP function for use as an SQL scalar function
- SQLite3::enableExceptions
- Функция SQLite3::escapeString() - Returns a string that has been properly escaped
- Функция SQLite3::exec() - Executes a result-less query against a given database
- Функция SQLite3::lastErrorCode() - Returns the numeric result code of the most recent failed SQLite request
- Функция SQLite3::lastErrorMsg() - Returns English text describing the most recent failed SQLite request
- Функция SQLite3::lastInsertRowID() - Returns the row ID of the most recent INSERT into the database
- Функция SQLite3::loadExtension() - Attempts to load an SQLite extension library
- Функция SQLite3::open() - Opens an SQLite database
- SQLite3::openBlob
- Функция SQLite3::prepare() - Подготавливает SQL-запрос для выполнения
- Функция SQLite3::query() - Выполняет SQL-запрос
- Функция SQLite3::querySingle() - Executes a query and returns a single result
- Функция SQLite3::version() - Returns the SQLite3 library version as a string constant and as a number
Коментарии
$encryption_key and all encryption features will be enabled only if the SQLite encryption module is installed. It's a proprietary, costly module. So if it's not present, supplying an encryption key will have absolutely no effect.Note that the SQLITE3_OPEN_READONLY flag cannot be combined with the SQLITE3_OPEN_CREATE flag. If you combine both of these flags, a rather unhelpful "Unable to open database: out of memory" exception will be thrown.