MediaWiki

Extension:Cargo

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Cargo
Release status: stable
Implementation Special page , API , Parser function
Description An extension that allows for the storage and querying of data contained within templates.
Author(s) Yaron Koren <yaron57@gmail.com> (Yaron Korentalk)
Latest version 3.7 (September 2024)
Compatibility policy Master maintains backward compatibility.
MediaWiki 1.39+
Database changes Yes
Composer mediawiki/cargo
Tables cargo_tables
cargo_pages
cargo_backlinks
License GNU General Public License 2.0 or later
Download
Download extension
Git [?]:
Example A page containing various calls to #cargo_query
Parameters
  • $wgCargoFileDataColumns
  • $wgCargoDrilldownLargestFontSize
  • $wgCargoDecimalMark
  • $wgCargoDefaultStringBytes
  • $wgCargoAllowedSQLFunctions
  • $wgCargoHideNamespaceName
  • $wgCargoPageDataColumns
  • $wgCargoIgnoreBacklinks
  • $wgCargoMaxVisibleHierarchyDrilldownValues
  • $wgCargoDrilldownSmallestFontSize
  • $wgCargoLegacyNullLuaFieldsAsEmptyString
  • $wgCargoRecurringEventMaxInstances
  • $wgCargoDefaultMapService
  • $wgCargoStoreUseTemplateArgsFallback
  • $wgCargoTablesPrioritizeReplacements
  • $wgCargoMaxQueryLimit
  • $wgCargoDigitGroupingCharacter
  • $wgCargoDefaultQueryLimit
  • $wgCargoDrilldownNumRangesForNumbers
  • $wgCargo24HourTime
  • $wgCargoDrilldownUseTabs
  • $wgCargoMapClusteringMinimum
  • $wgCargoDrilldownMinValuesForComboBox
Added rights
  • recreatecargodata
  • deletecargodata
  • runcargoqueries
Hooks used
Hooks provided
Quarterly downloads 53 (Ranked 87th)
Translate the Cargo extension
Issues Open tasks · Report a bug

Cargo is an extension to MediaWiki that provides a lightweight way to store and query the data contained within the calls to templates, such as infoboxes. It is similar in concept to the Semantic MediaWiki extension, but offers a number of advantages, including ease of installation and ease of use.

Cargo stores all its data in database tables, which can be placed in either MediaWiki's own database (the default) or a separate database. For the most part, each stored template gets its data stored in a single DB table, with a column for each relevant template parameter. There are a few exceptions to this: the handling of template fields that hold arrays/lists of values, and of fields that hold geographical coordinates, is more complex, due to poor native handling of those data types in most DB systems. And multiple templates can be set to all store their data in one DB table.

The extension defines a number of parser functions; these three are the most important:

  • #cargo_declare - placed within the ‎<noinclude> part of a template; it defines the schema for a table.
  • #cargo_store - stores one row to a Cargo table; usually placed within the ‎<includeonly> part of a template.
  • #cargo_query - queries one or more Cargo data tables, using SQL components.

The other defined parser functions are:

  • #cargo_attach - defines a template as adding rows to a table declared elsewhere.
  • #cargo_compound_query - displays the results of multiple queries in one place.
  • #cargo_display_map - displays a map showing a single point.
  • #recurring_event - prints out the dates for a recurring event; for use by #cargo_store.

Cargo also defines various interfaces for viewing and drilling down through this stored data. As such, it adds the following special pages:

  • Special:CargoQuery
  • Special:CargoTableDiagram
  • Special:CargoTables
  • Special:Drilldown

Cargo has been tested, and works, with the MySQL and PostgreSQL database systems. In theory, it also supports SQLite, but it has not been well-tested with SQLite and may not work.

This version of the Cargo extension requires MediaWiki 1.38+.

Click through the pages in the navigation bar above to learn more about Cargo, how it works, how to use it, and how to install it.

Installation

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See Download and Installation .

Configuration

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Below are Cargo's global configuration settings along with their default values.

To configure Cargo to use a separate database instead of the MediaWiki database, the following settings are provided:

Separate database configuration settings
Setting Default Description
$wgCargoDBtype null Database type.
$wgCargoDBserver null Host name or IP address of database server.
$wgCargoDBname null Name of the database.
$wgCargoDBuser null Database username.
$wgCargoDBpassword null The password for $wgCargoDBuser.
$wgCargoDBprefix null Database table name prefix.
$wgCargoDBRowFormat null Data base row format.

For character configuration as related to numbers, the following configuring settings are provided:

Character configuration settings
Setting Default Description
$wgCargoDecimalMark . Decimal character for numbers.
$wgCargoDigitGroupingCharacter , Thousands digit separator.

The remaining global configuration settings are as follows:

Setting Default Description
$wgCargoAllowedSQLFunctions [] Sets allowed SQL functions. See Using SQL Functions for defaults.
$wgCargoRecurringEventMaxInstances 100 The number of max instances to store for recurring events with no set end date.
$wgCargoDefaultStringBytes 300 The default number of characters for fields of type Page, String, Wikitext string, File, URL, Email
$wgCargoDefaultQueryLimit 100 Number of results to show for #cargo_query if no limit is set
$wgCargoMaxQueryLimit 5000 The maximum allowed number of results for #cargo_query
$wgCargo24HourTime false If true uses 24-hour time for Datetime field types.
$wgCargoDefaultMapService OpenLayers Sets the default map service to Google Maps, if set to googlemaps, to Leaflet if set to leaflet, and to OpenLayers if set to openlayers.
$wgCargoGoogleMapsKey null API key for Google Maps, for the googlemaps display format.
$wgCargoMapClusteringMinimum 80 If the number of map points displayed is greater than the value of $wgCargoMapClusteringMinimum, the map displays the locations in "clusters" instead of individual points, for readability. If set to a very high number, does not display clustering.
$wgCargoDrilldownUseTabs true Displays Special:Drilldown table names as tabs at the top instead of a vertical list at the side.
$wgCargoDrilldownSmallestFontSize -1 If set to a positive number, sets the smallest font size, in pixels, for a tag-cloud-style display of filter values.
$wgCargoDrilldownLargestFontSize -1 If set to a positive number, sets the largest font size, in pixels, for a tag-cloud-style display of filter values.
$wgCargoDrilldownMinValuesForComboBox 40 Sets the minimum number of values before their display is converted to a combo box, instead of individual links.
$wgCargoDrilldownNumRangesForNumbers 5 For fields/filters of type Integer or Float, specifies the number of "buckets" into which values are divided.
$wgCargoMaxVisibleHierarchyDrilldownValues 30 If set to a positive integer, specifies the maximum number of values shown at a time for any hierarchy field (All the top-level values are shown irrespective of this value). The values are hidden beyond a certain depth of the hierarchy such that the count of total visible values is at most this number.
$wgCargoTablesPrioritizeReplacements false If true, all tables having a replacement appear at the top of the Special:CargoTables page, instead displaying them in alphabetical order.
$wgCargoPageDataColumns [] The set of fields to store in the _pageData Cargo table. See Storing page data .
$wgCargoFileDataColumns [] The set of fields to store in the _fileData Cargo table. See Storing file data .
$wgCargoHideNamespaceName [6] Array of namespaces to hide from query results.
$wgCargoLegacyNullLuaFieldsAsEmptyString false Null results to the Lua Cargo query function should return as string rather than nil. This allows you to rollback a breaking change from early 2022. New wikis created after this time should not enable this.
$wgCargoStoreUseTemplateArgsFallback true Enable the behavior that looks for template arguments that match the template's declared table to fill columns.


See also

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