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A PHP class to simplify the creation of SQL queries in PHP using dictionaries.

This repository was created for my blog post which contains additional information.

Basic Usage

// Open SQLite database
$db = new PDO('sqlite:db.sqlite');
// Create SJMSQLayer object
$dbl = new SJMSQLayer($db);
// Activate logging
$dbl->log = array();
// Use SJMSQLayer
$dbl->query("DROP TABLE %K", "books")->exec();
// Show all executed queries including error messages

Query Format Syntax

The query function works similar to printf. The following conversion specifications are available. The code at the end shows the results with an input dictionary {"key1":"value1", "key2":"value2"}.

%@ — quoted value / comma separated list 'value1','value2'
%K — unquoted value / comma separated list value1,value2
%W — where (WHERE %W), key = value, connected with 'AND' key1='value1' AND key2='value2'
%S — assign dictionary key to value (UPDATE SET %A) key1='value1',key2='value2'
%I — insert (INSERT INTO %K %I) (key1,key2) VALUES('value1','value2')

// Common examples
$dbl->query('INSERT INTO books %I', $data);
$dbl->query('UPDATE foo SET %S WHERE %W', $data, $where);
$dbl->query('SELECT name FROM books WHERE %W', $where);
$dbl->query('SELECT name FROM books WHERE id IN (%@)', $ids);
$dbl->query('DELETE FROM books WHERE %W', $where);

// Advanced usage
$where = array();
// numbers are not quoted
$where['year'] = 1605;
// strings are
$where['name'] = "Don Quixote";
// null handling
$where['deleted'] = null;
// arrays generate IN (v1, v2)
$where['id'] = array(1, 2, "string");
// insert statement by using integer key
$where []= "pages < 1000";
// generate SQL
echo $dbl->query('SELECT name FROM books WHERE %W', $where)->query;

The last example will generate

	year=1605 AND 
	name='Don Quixote' AND 
	deleted ISNULL AND 
	id IN (1,2,'string') AND 
	pages < 1000

Using SJMSQLayerStatement

The query function returns a SJMSQLayerStatement object, which has the following properties:

class SJMSQLayerStatement {
	public $sql = null;
	public function exec();
	public function get($key=false);
	public function getAll($key=false);
	public function getDict($dictKey, $valueKey=false);
	public function getGroup($groupKey, $valueKey=false);

get returns a single row from a SELECT query, getAll returns an array with all rows. getDict will also return all rows, but instead of an array, the result will be a dictionary where each row is addressed by its value of $dictKey. getGroup is used if the value by which the rows are addressed is not unique. It will return a dictionary of arrays. Using the optional parameters $key and $valueKey will fetch single values instead of the whole rows.

$stm = $dbl->query("SELECT * FROM books");
// get array of all book id's
// get a dictionary of book titles by id
$stm->getDict("id", "title");
// get a dictionary of book id's by year
$stm->getDict("published", "id");


Clean SQL in PHP made easy




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