Using NIKA DBMS in internet

The system has been made by means of NIKA DBMS and http server (a program for using NIKA DBMS in internet). Data base has a tree-like structure. Each time client acceses the site, he gets the HTML-document using that http server. The HTML-document contains the path in data base and the current level in data base.

The common view of HTML-document made by the http server

Data base title

Path in data base
Home Pag -> NIKA_ROOT -> Field1 -> . . . Fieldn ->
  • Fieldn1 = Value1
  • Fieldn2 = Value2
  • . . .
  • Fieldnk = Valuek
  • }
  • Fieldnk+1 ->
  • Fieldnk+2 ->
  • . . .
  • Fieldnk+m ->
  • }
Next ->

Where -> means a hypertext link; Field1, Field2,...,Fieldn are vertices in the data base path; Fieldn1, Fieldn2,...,Fieldnk - terminal vertices, and Fieldnk+1,Fieldnk+2,..., Fieldnk+m - unterminal vertices.

Several variants of current level

  1. Table.
    The current level can contains the table, in which the first col. (and may be the second) contains elements with hypertext referencies. The other colums are terminal fields. In this case the html-document has the view as follows.
  2. Data base title

    Path in data base

    Home Page-> NIKA_ROOT-> Field1 -> . . . Fieldn ->
    Field(n+1)key Field(n+1)1 Field(n+1)2 . . . Field(n+1)m
    Value(n+1)key1 -> Value(n+1)11 Value(n+1)21 . . . Value(n+1)m1
    Value(n+1)key2 -> Value(n+1)12 Value[(n+1)22 . . . Value(n+1)m2
    . . .
    Value(n+1)keyk -> Value(n+1)1k Value(n+1)2k . . . Value(n+1)mk

    Where -> means a hypertext link. The terminal elements in the table are the elements from the next level of the data base hierarchy.

  3. Array.
    See the common view of HTML-document. In this case the current level of common view can be appears l-times (l=1,2,3,4,...) and in each case the reference fields, terminal fields have the particular values.
  4. Level scale.
    The current level look as scale of elements. Each element prints in brackets.
  5. Alphabetical index.
    The current level is alphabet. Each letter is reference to the group of elements beggining from this letter. Near the letter print the first element of the group.

Request system

Containes three levels for the request.
  1. Hierarchy list of NIKA data base objects.
  2. Input form of NIKA data base vertices for selected object.
  3. Result tree for given request.


  1. When the current level contains only one reference (and terminal fields are absent), the http server automatically passes onto the next level (under this field) and makes an HTML-document of that level.
  2. When the current level contains more than given number of fields the HTML-document has the refernce to the next portion of fields.
  3. As a rule, level scale combines with table or array.
  4. If the number of elements in current level is very big, then it divided by several seperate html-documents. Each html-document (except the last) containes the reference to the next html-document. The reference prints at the end of html-document: next

View of configuration (optional)