Opasnet base structure

This page is a knowledge crystal of subtype variable. The page identifier is Op_en1913
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This page is about the structure of Opasnet Base. For a general description, see Opasnet base.

Scope

Opasnet base is a storage and retrieval system for results of variable and data from studies. What is the structure of Opasnet base such that it enables the following functionalities?

1. Storage of results of variables with uncertainties when necessary, and as multidimensional arrays when necessary.R↻
2. Automatic retrieval of results when called from Opasnet wiki or other platforms or modelling systems.
3. Description and handling of the dimensions that a variable may take.
4. It is possible to protect some results and data from reading by unauthorised persons.
5. If is possible to build user interfaces for easily entering observations into the Base.

Definition

Data

Software

Because Opasnet base will contain very large amounts of mostly numerical information, the state-of-the-art structure is a SQL database. Because of its flexibility, ease of use, and cost, MySQL is an optimal choice among SQL software. In addition to the database software, a variable transfer protocol is needed on top of that so that the results of variables can be retrieved and new results stored either automatically by a calculating software, or manually by the user. Fancy presenting software can be built on top of the database, but that is not the topic of this page.

Storage and retrieval of results of variables

The most important functionality is to store and retrieve the results of variables. Because variables may take very different forms (from a single value such as natural constant to an uncertain spatio-temporal concentration field over the whole Europe), the database must be very flexible. The basic solution is described in the variable page, and it is only briefly summarised here. The result is described as

  P(R|x1,x2,...) 

where P(R) is the probability distribution of the result and x₁ and x₂ are defining locations of a dimension where a particular P(R) applies. Typically locations are operationalised as discrete indices. A variable must have at least one dimension. Uncertainty about the true value of the variable is operationalised as a random sample from the probability distribution, in such a way that the samples are located along an index Sample, which is a list of integers 1,2,3...n, where n=number of samples.

• Old description of the structure

Dependencies

• Opasnet structure
• Open assessment

Result

Opasnet base is a MySQL database located at http://base.opasnet.org.

Table structure

• We need Ressec (Result secure) and Resinfosec (Result info secure) tables for secure information. All other tables are openly readable except these two. They have the same structure as Res and Resinfo tables, respectively.

Obj Describes all objects FIELD TYPE EXTRA id int(10) primary Ident varchar(20) unique Name varchar(200) Unit varchar(16) Objtype_id tinyint(3) Page int(10) Wiki_id tinyint(3)	Cell (previously Res) Cells of an object FIELD TYPE EXTRA id int(12) primary Obj_id_v (variable id) int(10) Obj_id_r (run id) int(10) Mean (mean of the cell) float N (samplesize) int(10)	Loc Location information FIELD TYPE EXTRA id int(10) primary Obj_id_i (index id) int(10) Location varchar(1000) Roww (row # of index) Mediumint(8) Description varchar(150)
Item Items of a set FIELD TYPE EXTRA id int(10) primary Sett_id (set to which the item belongs) int(10) Obj_id (item id) int(10) Fail (membership not valid?) tinyint(1)	Loccell (previously Locres) Locations of a cell FIELD TYPE EXTRA id int(10) primary Cell_id int(10) Loc_id int(10)	Res (previously Sam) Result distribution (actual values) FIELD TYPE EXTRA id bigint(20) primary Cell_id int(12) Obs (previously Sample) int(10) Result float
Sett List of sets FIELD TYPE EXTRA id int(10) primary Obj_id int(10) Settype_id tinyint(3)	Settype (previously Sty) Types of set-item memberships FIELD TYPE EXTRA id tinyint(3) Settype (previously Stype) varchar(30)	Objtype (previously Typ) Types of objects FIELD TYPE EXTRA id tinyint(3) primary Objtype (previously Type) varchar(30)
Wiki (previously Wik) Wiki information FIELD TYPE EXTRA id tinyint(3) primary Url varchar(255) Wname varchar(20)	Resinfo (previously Descr) Additional description of the result FIELD TYPE EXTRA id bigint(20) primary Restext (previously Description) varchar(250) Who varchar(50) When timestamp	Objinfo (previously Inf) Additional information about the object FIELD TYPE EXTRA id int(10) primary Begin date End date Who varchar(50) Url varchar(250)

See also

Some useful syntax

• http://www.baycongroup.com/sql_join.htm
• Opasnet base connection.ANA for Analytica: for writing and reading variable results into and from the database. Writing requires a password. For SQL used in the model, see the model page.
• Some historical queries

<sql-query display=1> SELECT Obj.id, Obj.Ident, Obj.Name, Obj.Typ_id, Sty_id, Itemm.Ident as Iident, Itemm.Name as Iname FROM Obj LEFT JOIN Sett ON Obj.id = Sett.Obj_id LEFT JOIN Item ON Sett.id = Item.Sett_id LEFT JOIN Obj AS Itemm ON Item.Obj_id = Itemm.id </sql-query>

NOTE! The queries below work in the new database "opasnet_base", not "resultdb" as the old versions.

{{#sql-query: SELECT Var.Ident, Var.Name, Var.Unit, Run.Ident, Begin, Who, Run.Name as Method FROM Obj as Var, Obj as Run, Cell, Objinfo WHERE Var.Ident = "Op_en1913" AND Var.id = Cell.Obj_id_v AND Run.id = Cell.Obj_id_r AND Run.id = Objinfo.id GROUP BY Var.id, Run.id |Runs}}

{{#sql-query: SELECT Var.Ident, Var.Name, Cell.id, N, Begin, Mean, Var.Unit FROM Obj as Var, Obj as Run, Cell, Objinfo WHERE Var.Ident = "Op_en1913" AND Var.id = Cell.Obj_id_v AND Run.id = Cell.Obj_id_r AND Run.id = Objinfo.id GROUP BY Cell.id ORDER BY Run.id DESC, Var.Ident |Means and samplesizes (N)}}

{{#sql-query: SELECT Var.Ident, Cell.id, Cell.Obj_id_r as Run, Obs, Result, Var.Unit FROM Obj as Var, Cell, Res WHERE Var.Ident = "Op_en1913" AND Var.id = Cell.Obj_id_v AND Cell.id = Res.Cell_id ORDER BY Cell.Obj_id_r, Var.Ident, Cell.id |Full sample}}

List all dimensions that have indices, and the indices concatenated:

<sql-query display="1"> SELECT Dim.Ident, Dim.Name, Dim.Unit, Group_concat(Ind.Ident ORDER BY Ind.Name SEPARATOR ', ') as Indices FROM Obj AS Dim, Obj as Ind, Sett, Item WHERE Dim.id = Sett.Obj_id AND Sett.Settype_id=1 AND Sett.id = Item.Sett_id AND Item.Obj_id = Ind.id GROUP BY Dim.Name ORDER BY Dim.id </sql-query>

List all indices, and their locations concatenated:

<sql-query display="1"> SELECT Ident, Name, Unit, GROUP_CONCAT(Location ORDER BY Roww SEPARATOR ', ') AS Locations FROM Obj AS Ind, Loc WHERE Ind.id = Loc.Obj_id_i GROUP BY Name ORDER BY Name </sql-query>

List all variables and their runs, and also list all indices (concatenated) used for each variable for each run.

<sql-query display="1"> SELECT Var_id, Run_id, Ident, Name, GROUP_CONCAT(Indic SEPARATOR ', ') AS Indices, N, Method FROM

  (SELECT Var.id as Var_id, Run.id as Run_id, Var.Ident AS Ident, Var.Name as Name, Ind.Ident AS Indic, N, Run.Name AS Method
  FROM Obj AS Var, Obj AS Run, Obj AS Ind, Loccell, Loc, Cell
  WHERE Var.id = Cell.Obj_id_v
  AND Run.id = Cell.Obj_id_r
  AND Cell.id = Loccell.Cell_id
  AND Loc.id = Loccell.Loc_id
  AND Ind.id = Loc.Obj_id_i
  GROUP BY Var_id, Run_id, Ind.Ident ) AS Temp1

GROUP BY Var_id, Run_id </sql-query>