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Re: [Help-glpk] Write solution on database

From: Diana Acosta
Subject: Re: [Help-glpk] Write solution on database
Date: Tue, 24 Feb 2015 13:55:08 -0500

Hi Lance, Hi Heinrich

Thank you so much for help me in my problem and take the time to answer me; I try to implement one of this solution, if I have more questions I hope that I can communicate with you guys and the all of the members of the mail-list :)

Best regards,


2015-02-23 17:27 GMT-05:00 Heinrich Schuchardt <address@hidden>:
Hello Diana,

glpk-java/examples/java/ shows what needs to be done.

Run glpk/examples/tsp.mod and press the terminate button.
You will see an output like

+  7505: mip =   6.859000000e+03 >=   6.729000000e+03   1.9% (143; 254)
Optimal tour has length 6859
>From node   To node   Distance
        1        14        479

In the program a GlpkCallbackListener is registered with


In the callback routine of the listener


signals that no further nodes shall be evaluated.

In the callback routine you will have to evaluate the elapsed runtime to
decide when to call glp_ios_terminate().

To determine that a feasible solution has been found you could use the
following code in the callback routine:

        int reason = GLPK.glp_ios_reason(tree);

        if (reason == GLPKConstants.GLP_IBINGO) {
                // We have a better integer feasible solution.

Do not set tm_lim with glp_iocp.setTm_lim().

Best regards


On 23.02.2015 20:24, Diana Acosta wrote:
> Hi everybody,
> I´m working with GLPK for Java and I implemented a MIP problem using GNU
> MathProg. I have the issue that the time used to obtain a optimal
> solution it´s more longer that I need; for this reason I decide use the
> structure glp_iocp to set the time limit of search; this work fine; but
> I have a problem because my model works with database, I used
> specifically mysql server and an interface with phpmyadmin, and when the
> search stop because the time limit was exceed, I have a feasible
> solution because I know the value of the objective function for MIP
> solution, but the solution, the values of the variables, isn't write on
> the database because this limit stop totally the model (file .mod)
> before can write on database, and there is where I need the answer.
> So I wanna ask if anybody can help me with a function of a structure of
> GLPK, that I can use to write the answer on database or with any form to
> do this,
> Thank you so much :)
> --
> Diana Acosta Rueda

Diana Acosta Rueda
Estudiante de Ingeniería de Telecomunicaciones
Universidad de Antioquia

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