[eclipse-clp-users] Dbi Query with more than 1 columns

From: Edgaonkar, Shrirang <Shrirang.Edgaonkar_at_...390...>
Date: Wed, 28 Jan 2015 08:53:05 +0000
Dear Clp users,

   I have an observation with the Dbi query. If the underlying table has a Varchar then we can have only one column in the select query.

Check the following example which fails since tbl has two columns and first one is a Varchar(cityname). Eclipse tool crashes after execution of the script.

:- lib(dbi).
solve(Hosts, IN, Y, Tuple) :-

 % Connect to DB  user/password
 session_start("root", "", [], Session),

 % SQL
 SQL = "select  c1.cityname, c1.cityid from simulator.city c1",

 % Template
 Template = tbl(A, 1),

 % Execute SQL
 session_sql_query(Session, Template, SQL, Cursor),

 % Get Results
 cursor_all_tuples(Cursor, Tuple),

 % Close Cursor

 % Close DB Connection

Following is the matrix for different values and their execution result.

 Template = tbl(A),   % Success

 Template = tbl(0, 1),   % Success where 0 and 1 are integer fields(not displayed in the above script)

Template = tbl(0),   % Success

Please confirm if this is right and if you have any solution.

Thanks and Regards,

Shrirang Edgaonkar

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Received on Wed Jan 28 2015 - 08:53:17 CET

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