SQL query in the HTTP Server

You can create HTML pages containing SQL query results by using "/Query?". To do so, you must first make up the appropriate query string (see SQL in Control, basics and SQL Panel, basics). You must also create an HTML base page as a reference.

The SQL query requires the following parameters:

Parameter Contents
file Specifies the base HTML file (for example, query/testQuery.html)
query

Query string (for example, SELECT+'_online.._value'+FROM+'Ex*')

Caution: Replace spaces in the query string with '+'.
lines Optional: number of lines per HTML page [default 100]
head Optional: HTML table header from the results of the query [with header=1, default =0]

You should always call the query tables from fixed links (see "Calling HTML references") so as to avoid faulty query strings. The query tables can, however, be called directly from a web browser (see example below).

The base page must be saved as an HTML page and must contain a table lines placeholder #table inside the TABLE tags.

The following table explains all placeholders used on the base page.

Placeholder Meaning / purpose
#table Inserts the result lines at this point
#lines Optional: Display number of result lines
#page, #pages Optional: Page number and total number of pages
#next Optional: If the results span multiple pages, you can browse using the <<<>>> links

Example

The example displays all DPE online values and times that start with "Example" and are not invalid:

  1. 1. Query string:

    SELECT '_online.._value', '_online.._stime'

    FROM+'Example*' WHERE ('_online.._invalid'=0)

  3. 2. The following base HTML page is saved under

    <proj_path>/data/http/<language>/query/testQuery.html .

    <html><head><title>Events</title></head>

    <body bgcolor="c0c0c0"><basefont face="arial">

    <H3 align=center>Query Result - #page/#pages</H3>

    <p>Number: #lines

    <center><table BORDER="1" WIDTH="100%" NOSAVE bgcolor="c0c0c0">

    <tr bgcolor="#8888FF">

    <th><FONT SIZE=2>DPE</th>

    <th><FONT SIZE=2>Value</th>

    <th><FONT SIZE=2>Time</th> </tr>

    #table

    </table></center>

    <center><b>#next</b></center></p>

    </body></html>

  5. 3. Open the table in a browser as follows:

http://localhost/Query?file=query/testQuery.html%20&query=SELECT+'_online..

_value',+'_online.._stime'+FROM+'Example*'+WHERE+('_online.._invalid'=0)

A fixed link to table (in a file):

<a href="/Query?file=query/testQuery.html &query=SELECT+'_online.._value',+'_online.._stime'+FROM+'Example*'+WHERE+

('_online.._invalid'=0)&lines=20&head=0" target="result">List all example DPs that are not invalid</a>

Figure 1. Query results