README

Given constraints, parses a string of conditions into a valid MySQL WHERE clause

Installation

composer require markjaquith/wherewithal

Usage

use MarkJaquith\Wherewithal\{Parser, Config};

$config = (new Config)
	->addOperators('<', '>', '<=', '>=', '=', '/') // Or add a subset.
	->addColumn('column_name', 'column_alias1', 'column_alias2')
	->addColumn('quantity')
	->addColumn('price', 'cost');

$parser = new Parser($config);

$structure = $parser->parse('quantity > 5 and (price < 3.00 or column_alias2 = 10'));

$structure->toString();
/*
  string(57) "quantity > ? and ( price < ? or price / column_name = ? )"
*/

$structure->getBindings()]);
/*
  array(3) {
    [0]=>
    string(1) "5"
    [1]=>
    string(4) "3.00"
    [2]=>
    string(2) "10"
  }
*/

You can also map simple column names to complex expressions like so:

$structure->mapColumns(function($col) {
	return [
		'column_name' => '`some_long_table_name`.`long_column_name`',
	]($col) ?? $col;
})->toString();
/*
	string(92) "(`some_long_table_name`.`long_column_name`) > ? and ( price < ? or price / column_name = ? )"
*/

Columns that you don't put in the config will be assumed to be values. Values always use the placeholder token ?.

You should combine the resulting WHERE (or HAVING) clause using your database layer. Here's how you'd do it in Laravel:

$orders = DB::table('orders')
	->whereRaw($structure->toString(), $structure->getBindings())
  ->get();