Re: [eclipse-clp-users] Dbi prepare query issue.

From: Kish Shen <kish.shen_at_...6...>
Date: Wed, 9 Mar 2016 01:20:43 +0000
Hi Shrirang,

> I know cursor execute would just run the query. But even that wasn't
happening.

I don't understand why you sent the code in your previous message to the
mailing list. If you read and understood the documentation, did you not see
that the code you sent was incorrect?

If you are getting some errors with giving an integer as the parameter in
cursor_next_execute/2 (the name Result2 you used is misleading because that
is not its purpose -- it is a parameter, not a result), then please send
this code, and also the error you are getting.

>qlprepare had an issue on windows version some time back so I thought I
should confirm.

If you are referring to the issue with session_sql_prepare/4 from last
October, then I remember asking you to confirm if the changes I made fixed
the problem, but I never heard back from you on that -- I did not have
access to MySQL running on Windows then (or now), so I could not do the
test myself.

In any case, your current problem does not seem to be in
session_sql_prepare/4. If you are getting exceptions or other errors (I
don't really know what you mean by 'that wasn't happening' - please give
precise descriptions of the errors you are getting)  with the parameter set
correctly, then please send that code.

Cheers,

Kish


On Tue, Mar 8, 2016 at 9:09 PM, Edgaonkar, Shrirang <
Shrirang.Edgaonkar@...390...> wrote:

> Dear Kish,
>
> I have read the document and tried all combinations possible. Even Result2
> was replaced by an integer. I know cursor execute would just run the query.
> But even that wasn't happening. Sqlprepare had an issue on windows version
> some time back so I thought I should confirm.
>
> Thanks,
> Shrirang
>
> On 09-Mar-2016, at 5:37 AM, Kish Shen <kish.shen@...6...> wrote:
>
> Shrirang,
>
> >Kindly let me know what could be wrong.
>
> It looks like you are not using cursor_next_execute/2 correctly. Have you
> read the documentation for lib(dbi) -- both the chapter in the embedding
> and interface manual
>
> http://eclipseclp.org/doc/embedding/embroot059.html
>
> and the reference documentations for the library predicates, such as
> cursor_next_execute/2:
>
> http://eclipseclp.org/doc/bips/lib/dbi/cursor_next_execute-2.html
>
> both these explains how to use prepared SQL statements, and should have
> the information on your problem..
>
> I think the reason you are getting the bad template error is because you
> are calling cursor_next_execute(Cursor, Result1) with Result1 being
> count(Result2) where Result2 being a variable. Judging from your code, you
> seem to be expecting cursor_next_execute/2 to be returning results from
> some results to be returned from the prepared SQL query. This is incorrect--
> cursor_execute/2 is actually used to *execute* the prepared SQL statement
> from session_sql_prepare/4: this should be clear from the summary of the
> reference documentation:
>
> cursor_next_execute(++Cursor, +Tuple) Executes the parametrised prepared
> SQL statement represented by Cursor. *Cursor*A cursor handle*Tuple*A
> tuple of parameter values matching the template for this cursor (structure)
> The second argument, which you call Resuts1, is actually there to supply
> the parameter value for the prepared SQL statement represented by Cursor -
> the ? in your  "select count(column) from table where column > ?" so in
> your case, if you call cursor_next_execute(Cursor, count(7), that will
> execute the SQL query
>
> "select count(column) from table where column > 7".
>
> Your code is also missing a predicate such as cursor_all_tuples/2 to
> collect the results from the SQL query. Again, this is stated clearly in
> the reference documentation:
>
> >If the SQL statement is a query, and was prepared as a query using
> session_sql_prepare_query/5, results can be obtained from the query by the
> cursor_*_tuple family of predicates.
>
> Cheers,
>
> Kish
>
>
>
> On Tue, Mar 8, 2016 at 4:28 AM, Edgaonkar, Shrirang <
> Shrirang.Edgaonkar@...390...> wrote:
>
>> Dear clp users,
>>
>>
>>
>>   I am facing a problem with prepare statement in 32 bit as well as 64
>> bit Windows OS using respective ECLipSe.
>>
>> Eclipse version is 6.1 217. Kindly let me know what could be wrong.
>> Please find the console output at the end of the email.
>>
>>
>>
>> :- lib(dbi).
>> :- lib(ic).
>> solveDB(Result):-
>>     Result2 :: 1..10,
>>     Template = count(24),
>>     session_start("blah"@"blah", "blah", [dbname:"blah"], Session),
>>  writeln("TEST"),
>>     SQL = "select count(column) from table where column > ?",
>>  writeln("TEST1"),
>>     session_sql_prepare(Session, Template, SQL, Cursor),
>>  writeln([Cursor,"TEST2"]),
>>  Result1 = count(Result2),
>>     cursor_next_execute(Cursor, Result1),
>>  writeln(Result1),
>>     cursor_close(Cursor).
>>
>>
>>
>>
>> ----------------------------------------------------------------------------------------------------------------
>>
>>
>>
>> console output:-
>>
>>
>>
>> TEST
>> TEST1
>> [cursor('MySQLC'(16'327ee0), 'MySQLS'(16'327e40)), TEST2]
>> DBI General exception Code:-5 in
>> cursor_next_exec(cursor('MySQLC'(16'327ee0), 'M
>> ySQLS'(16'327e40)), count(_138309), options(_138404, _138405, "client",
>> "read_on
>> ly"))
>> DBI-005: bad template
>> Aborting execution ...
>> abort
>>
>> Thanks and Regards,
>>
>> Shrirang Edgaonkar
>>
>>
>>
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>
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Received on Wed Mar 09 2016 - 01:20:51 CET

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