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#REDIRECT [[Tygron Query Language]]
 
{{learned|what the Tygron Query Language (TQL) is|how to create TQL queries|what type of queries you can create|what TQL is currently applied for}}
 
==TQL==
The Tygron Query Language is a special-purpose programming language designed for obtaining spatial area information during a specific project session in the Tygron Engine. The primary reason for its introduction was to bridge the gap between the Tygron Engine and the implementation of Microsoft Excel spreadsheets.
 
==Queries==
The main operation used in TQL is the query, which is performed with the declarative <code>SELECT</code> statement. A '''declarative''' statement tells the system which data is specifically required, after which the system will retrieve the data on it's 'own'. This is contrary to an '''imperative''' statement, where the system is told 'how' to obtain said data. A <code>SELECT</code> statement retrieves data from a running Tygron project session. TQL queries using <code>SELECT</code> statements have no persistent effect on the project session itself.
 
Queries in TQL using the <code>SELECT</code> statement allow the user to describe the desired data, leaving the Tygron Engine responsible for planning, optimizing, and performing the physical operations necessary to produce the desired result as output.
 
When starting a query with the <code>SELECT</code> statement, a result parameter must follow after the <code>SELECT</code> keyword. Currently, one of the following result parameters can be selected:
{| class="wikitable"
|-
! Result Parameter
! Description
! Example
|-
| <code>FLOORSIZE</code>
| Floor size of buildings.
| <code>SELECT_FLOORSIZE_WHERE_CATEGORY_IS_OFFICES</code>
|-
| <code>LOTSIZE</code>
| Lot size of buildings.
| <code>SELECT_LOTSIZE_WHERE_CATEGORY_IS_OFFICES</code>
|-
| <code>UNITS</code>
| Amount of housing units.
| <code>SELECT_UNITS_WHERE_CATEGORY_IS_SOCIAL</code>
|-
| <code>DIKES</code>
| Surface space of constructed dikes or levees.
| <code>SELECT_DIKES_WHERE_ZONE_IS_1</code>
|}
 
===Comparison Predicate===
The <code>SELECT</code> and result parameter are followed by a <code>WHERE</code> statement. The <code>WHERE</code> statements contains a comparison predicate, which are logical propositions that restrict the information retrieved by the query. In other words, the <code>WHERE</code> clause eliminates all information from the result set where the comparison predicate does not evaluate as being valid (Boolean = True).
 
Take for instance the following statement as example of a logical proposition:
 
: ''The Student is a Senior.''
 
This statement excludes all students that are Junior, Sophomore or Freshman, as the outcome of the logical proposition would be 'False' in these cases.
 
The comparison predicate consists of 0 or more clauses, which consist of three parts;
* Clause Type
* Operator
* Value
 
====Clauses====
Some clauses are particular for constructions, others are applied to surface areas of constructions or dikes. The clause types and expected values currently supported are:
{| class="wikitable"
|-
! Clause Type
! Description
! Value Type
! Example
|-
| <code>CATEGORY</code>
| A construction belongs to the specific [[List_of_actions#Construction_Options | Function category]]
| Function category
| <code>CATEGORY_IS_INDUSTRY</code>
|-
| <code>FUNCTION</code>
| A construction belongs to a specific [[Function]]
| Function ID
| <code>FUNCTION_IS_621</code>
|-
| <code>DIKE</code>
| Surface area lies (partly) within a particular type of [[dike | Dike (or Levee)]]
| Dike ID
| <code>DIKE_IS_0</code>
|-
| <code>MAP</code>
| A construction or dike is present in the specified map or view. Also see [[#Simulation_Type | Simulation Type]]
| CURRENT or MAQUETTE
| <code>MAP_IS_MAQUETTE</code>
|-
| <code>STAKEHOLDER</code>
| A construction or surface area is owned by a specific [[Stakeholders| Stakeholder]]
| Stakeholder ID
| <code>STAKEHOLDER_IS_7</code>
|-
| <code>STAKEHOLDERTYPE</code>
| A construction or surface area is owned by stakeholders of a specific [[Stakeholders#Which_types_of_stakeholder_are_available_in_the_Tygron_Engine.3F | Stakeholder Type]]
| Stakeholder Type
| <code>STAKEHOLDERTYPE_IS_COMPANY</code>
|-
| <code>STATE</code>
| A construction resides in the specified [[#State| State]]
| State Type
| <code>STATE_IS_PENDING_CONSTRUCTION</code>
|-
| <code>TERRAIN</code>
| Surface area lies (partly) within a specific [[Terrains|Terrain]]
| Terrain ID
| <code>TERRAIN_IS_1</code>
|-
| <code>TERRAINTYPE</code>
| Surface area lies (partly) within terrains with a specific [[Terrains#Terrain_Type | Type of Terrain]]
| Terrain Type
| <code>TERRAIN_IS_1</code>
|-
| <code>ZONE</code>
| Surface area lies (partly) within a specific [[Zoning|Zone]]
| Zone ID
| <code>ZONE_IS_25</code>
|}
 
====Operators====
TQL clauses currently support one Operator:
{| class="wikitable"
|-
! Operator
! Description
! Example
|-
| <code>IS</code>
| Equal to
| <code>CATEGORY_IS_OFFICES</code>
|}
 
====Simulation Type====
Depending on the [[Simulation Type]], the map parameter is named as follows in the [[Query Tool]]:
{| class="wikitable"
|-
! Simulation Type
! <code>CURRENT</code>
! <code>MAQUETTE</code>
|-
| Planning
| <code>ORIGINAL</code>
| <code>PLANNED</code>
|-
| Timeline
| <code>TODAY</code>
| <code>MODEL</code>
|}
 
====State====
During a project session in the Tygron Engine, constructions transform from one phase into another. For example; from being planned, to being permitted, to being constructed, to being ready.
The currently available states are:
{| class="wikitable"
|-
! State
! Explanation
|-
| <code>CONSTRUCTING</code>
| Construction is being constructed.
|-
| <code>CONSTRUCTION_APPROVED</code>
| Construction is approved.
|-
| <code>CONSTRUCTION_DENIED</code>
| Construction is denied.
|-
| <code>DEMOLISH_APPROVED</code>
| Demolition is approved.
|-
| <code>DEMOLISH_DENIED</code>
| Demolition is denied.
|-
| <code>DEMOLITION_FINISHED</code>
| Demolition is finished.
|-
| <code>DEMOLISHING</code>
| Construction is being demolished.
|-
| <code>NOTHING</code>
| Construction does not exist.
|-
| <code>PENDING_CONSTRUCTION</code>
| Construction is waiting for the date to be constructed.
|-
| <code>PENDING_DEMOLISHING</code>
| Construction is waiting for the date to be demolished.
|-
| <code>PENDING_UPGRADE</code>
| Construction is waiting for the date to be upgraded.
|-
| <code>READY</code>
| Construction is done constructing.
|-
| <code>REQUEST_CONSTRUCTION_APPROVAL</code>
| Request is send to ask construction approval.
|-
| <code>REQUEST_DEMOLISH_APPROVAL</code>
| Request is send to ask demolition approval.
|-
| <code>REQUEST_ZONING_APPROVAL</code>
| Request is send to ask zoning approval.
|-
| <code>WAITING_FOR_DATE</code>
| Waiting to receive a date on which to start construction.
|-
| <code>WAITING_FOR_DEMOLISH_DATE</code>
| Waiting to receive a date on which to start demolition.
|}
 
==Query Construction==
In order to make it easier to construct queries, a tool has been developed to create queries in the editor, which can then be copied and used elsewhere. This tool is known as the [[Query Tool]] and more information can be found on its own page.
 
==TQL Uses==
TQL is currently used to communicate with Microsoft Excel, using the [[Excel (Indicator)|Excel Indicator]].

Latest revision as of 09:23, 20 August 2018

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