wp-data-access / WPDataAccess / Data_Dictionary / WPDA_List_Columns_Cache.php

WPDA_List_Columns_Cache.php in WP Data Access – App Builder for Tables, Forms, Charts, Maps & Dashboards 5.5.41, at WPDataAccess/Data_Dictionary/WPDA_List_Columns_Cache.php

53 lines 1.5 KB

Raw Download Zip

1	<?php
2
3	/**
4	* Suppress "error - 0 - No summary was found for this file" on phpdoc generation
5	*
6	* @package WPDataAccess\Data_Dictionary
7	*/
8
9	namespace WPDataAccess\Data_Dictionary {
10
11	/**
12	* Class WPDA_List_Columns_Cache
13	*
14	* This class caches the instances of class {@see WPDA_List_Columns} used during the request to prevent repeating
15	* the same query more than once.
16	*
17	* @author Peter Schulz
18	* @since 1.0.0
19	*
20	* @see WPDA_List_Columns
21	*/
22	class WPDA_List_Columns_Cache {
23
24	/**
25	* @var array Cached instances of WPDA_List_Columns
26	*/
27	protected static $cached_list_columns = array();
28
29	/**
30	* Get instance of WPDA_List_Columns for supplied schema and table name
31	*
32	* Checks if an instance of class {@see WPDA_List_Columns} for the given combination of $schema_name and
33	* $table_name is already in cache. If an instance was found, a handle to it is returned. If not, a new
34	* instance is created, added to the cache and a handle to it is returned.
35	*
36	* @param $schema_name Database schema name (= MySQL database)
37	* @param $table_name Datable table name
38	*
39	* @return object Handle to instance of {@see WPDA_List_Columns} for supplied $schema_name and $table_name
40	*/
41	public static function get_list_columns( $schema_name, $table_name ) {
42	$index = "$schema_name.$table_name";
43	if ( ! isset( self::$cached_list_columns[ $index ] ) ) {
44	self::$cached_list_columns[ $index ] = new WPDA_List_Columns( $schema_name, $table_name );
45	}
46
47	return self::$cached_list_columns[ $index ];
48	}
49
50	}
51
52	}
53