README

Flat file db in pure php.

Why?

Partly as a learning exercise, partly since I needed a simple and PHP only DB for some cli scripts.

Features

Powerfull searches using search documents
Supports limits, ordering and custom filtering expressions
Multiple filesystem support through Flysystem
Simple transaction support
Validates that source has not been altered before writing
Fast logging with the dedicated LogEngine

Installation

composer require hanneskod/yaysondb

Usage

Setup

Yaysondb works as a handler for multiple collections.

use hanneskod\yaysondb\Yaysondb;
use hanneskod\yaysondb\Engine\FlysystemEngine;
use League\Flysystem\Filesystem;
use League\Flysystem\Adapter\Local;

$db = new Yaysondb([
    'table' => new FlysystemEngine(
        'data.json',
        new Filesystem(new Local('path-to-files'))
    )
]);

Access collection through property or collection()

$db->table === $db->collection('table');

Create

$db->table->insert(['name' => 'foobar']);

Transactions

Commit or rollback changes using commit(), reset() and inTransaction()

$db->table->commit();

Concurrency protection

Yaysondb supports limited concurrency protection when using the flysystem engine. A hash of the backend file is calculated at each read and any write action will fail if the hash has changed.

Read

Create search documents using the Operators class.

use hanneskod\yaysondb\Operators as y;

// Find all documents with an address in new york
$result = $db->table->find(
    y::doc([
        'address' => y::doc([
            'town' => y::regexp('/new york/i')
        ])
    ])
);

// The result set is filterable
foreach ($result->limit(2) as $id => $doc) {
    // iterate over the first 2 results
}

The search document

The following operators are available when creating search documents:

Operator	Description
`doc(array $query)`	Evaluate documents and nested subdocuments
`not(Expr $e)`	Negate expression
`exists()`	Use to assert that a document key exists
`type($type)`	Check if operand is of php type
`in(array $list)`	Check if operand is included in list
`regexp($reg)`	Check if operand matches regular expression
`equals($op)`	Check if operands equals each other
`same($op)`	Check if operands are the same
`greaterThan($op)`	Check if supplied operand is greater than loaded operand
`greaterThanOrEquals($op)`	Check if supplied operand is greater than or equals loaded operand
`lessThan($op)`	Check if supplied operand is less than loaded operand
`lessThanOrEquals($op)`	Check if supplied operand is less than or equals loaded operand
`all(Expr ...$e)`	All contained expressions must evaluate to true
`atLeastOne(Expr ...$e)`	At least one contained expressions must evaluate to true
`exactly($c, Expr ...$e)`	Match exact number of contained expressions evaluating to true
`none(Expr ...$e)`	No contained expressions are allowed evaluate to true
`one(Expr ...$ex)`	Exactly one contained expressions must evaluate to true
`listAll(Expr $e)`	Expression must evaluate to true for each list item
`listAtLeastOne(Expr $e)`	Expression must evaluate to true for at least one list item
`listExactly($c, Expr $e)`	Expression must evaluate to true for exact numer of items in list
`listNone(Expr $e)`	Expression is not allowed to evaluate to true for any list item
`listOne(Expr $e)`	Expression must evaluate to true for exactly one list item

Update

Collection::update() takes two arguments. A search document and an array of values. Documents matching the search document are updated with the supplied values.

Delete

Collection::delete() takes a search document as sole argument. Documents matching the search document are removed.

hanneskod/yaysondb

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