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Sqlite key value store

A package for creating self-contained sqlite key-value stores held in a file.

Usage

A key-value file is managed via the \SqliteKeyValueStore\Store class. To create an instance, pass the absolute path to the key-value file into the constructor. If the file does not exist yet, the constructor will create it.

$store = \SqliteKeyValueStore\Store('/path/to/file');

There are 2 exceptions that can be thrown by the constructor:

• \LogicException if the path is :memory:. In memory databases are strictly forbidden.
• \SqliteKeyValueStore\Exception if the database connection could not be established.

Getting a value from the store

Values can be retrieved from the store via the get method:

$value = $store->get('key', 'default value');

If the key exists then it is returned. If it does not then the default value (second parameter) is returned instead. The default value is null if not specified. \SqliteKeyValueStore\Exception if there was an issue retrieving the key.

Setting a value to the store

Values can be added/updated to the store via the set method:

$value = $store->set('key', 'value');

If the key exists then it is updated. If it does not then it is created. \SqliteKeyValueStore\Exception if there was an issue setting the key. This method returns the instance for method chaining.

Removing a value from the store

Values can be removed from the store via the remove method:

$value = $store->remove('key');

If the key exists, then it is removed. If it does not exist then nothing happens. \SqliteKeyValueStore\Exception if there was an issue deleting the key. This method returns the instance for method chaining.

Searching the store

There are 3 ways to search the store:

// search by keys containing the substring "some_key" where "?" is a wildcard.
$matches = $store->searchKeys('?some_key?', '?');

// search by values containing the substring "some_value" where "?" is a wildcard.
$matches = $store->searchValues('?some_value?', '?');

// search by keys containing the substring "some_key"
// AND by values containing the substring "some_value"
// where "?" is a wildcard.
$matches = $store->search('?some_key?', '?some_value?', '?');

The wildcard is an optional argument that defaults to *. If it is not exactly 1 character then \SqliteKeyValueStore\Exception is thrown. Each method returns a key-value array of pairs that were matched in the store.

Backing up the store

The store can be backed up by calling backup and specifying a path to backup the database to. The path must be empty or \SqliteKeyValueStore\Exception is thrown. While backing up the database is locked, and all write operations will block until the backup is complete.

$store->backup('backup/path');

Getting the store size

The size of the store can be determined by calling getSize which returns the number of key-value pairs in the store as an integer.

$store->getSize();