cppdemo_main.cpp

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/************************************************************
 *                                                          *
 * Copyright (c) 2001-2007 McObject LLC. All Right Reserved.*
 *                                                          *
 ************************************************************/

/*
"This sample demonstartes -hpp eXtremeDB schema compiler option \n"
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cppdemo.hpp"


const char* dbname = "demo";
const int SEGSZ = 1024 * 2000;
const uint2 PAGESIZE = 128;

void _SH_(void)
{

    char text[] = 
    {
        "\nThis sample demonstartes -hpp eXtremeDB schema compiler option \n"
    };
    char text1[] = 
    {
        "Copyright (c) 2001-2007 McObject LLC. All Right Reserved.\n\n"
    };

    printf("%s\neXtremeDB runtime version %d.%d, build %d\n%s\n\nPress Enter to start", text, MCO_COMP_VER_MAJOR,
           MCO_COMP_VER_MINOR, MCO_COMP_BUILD_NUM, text1);

    getchar();
}

inline void checkrc(MCO_RET rc)
{
    if (rc != MCO_S_OK)
    {
        printf("Unexpected error: %d\n", rc);
        exit( - 1);
    }
}


class MyPart: public cppdemo::Part
{
    public:

        MCO_RET stype_put(const char* s)
        {
                return type_put(s, (uint2)strlen(s) + 1);
        }

        MCO_RET sname_put(const char* s)
        {
                return name_put(s, (uint2)strlen(s) + 1);
        }

        void print(mco_trans_h t);

        const char* name()
        {
                static char bf[200];
                uint2 len;
                name_get(bf, sizeof(bf), len);
                bf[len] = 0;
                return bf;
        }

        const char* type()
        {
                static char bf[200];
                uint2 len;
                type_get(bf, sizeof(bf), len);
                bf[len] = 0;
                return bf;
        }

};


void MyPart::print(mco_trans_h t)
{
    if (!is_valid())
    {
        return ;
    }

    uint4 code;
    code_get(code);

    printf("\n[%d] %s : %s\n", code, name(), type());
    cppdemo::Dimensions dim;
    dim_read(dim);
    float w, h, l;
    dim.width_get(w);
    dim.length_get(l);
    dim.height_get(h);

    printf("%g x %g x %g \n", l, w, h);

}


static const char* i2s(int i)
{
    static char bf[20];
    sprintf(bf, "%d", i);
    return bf;
}

static int rand2(int lowlimit, int uplimit)
{
    int n = rand();
    return ((n % (uplimit - lowlimit + 1)) + lowlimit);
}

void populate_db(mco_db_h db)
{
    mco_trans_h t = 0;
    MCO_RET rc = MCO_S_OK;
    int j;

    for (j = 0; j < 10000; j++)
    {
        MyPart part;
        cppdemo::Dimensions dim;
        char temp[200];

        rc = mco_trans_start(db, MCO_READ_WRITE, MCO_TRANS_FOREGROUND, &t);
        if (rc)
        {
            break;
        }
        part.create(t);

        part.stype_put(i2s(j % 1000));

        sprintf(temp, "part # %d", j);
        part.sname_put(temp);
        part.price_put((float)(2.0 + j % 1000 / 2000.0));
        part.code_put(1000000+j);
        part.dim_write(dim);
        dim.height_put(rand2(20, 40));
        dim.width_put(rand2(20, 50));
        dim.length_put(rand2(35, 90));

        rc = mco_trans_commit(t);
        t = 0;
        if (rc)
        {
            break;
        }
    }

    if (rc)
    {
        printf("Error in populate_db(): %d\n", rc);
        if (t)
        {
            mco_trans_rollback(t);
        }
    }
    else
    {
        if (!rc)
        {
            printf("Inserted %d parts to the database\n", j);
        }
    }

}


// print all parts with given type
MCO_RET printPartsOfTheType(mco_db_h db, const char* type)
{
    mco_cursor_t csr;
    mco_trans_h t;
    MCO_RET rc = MCO_S_OK;

    printf("Parts with type = %s :\n", type);

    rc = mco_trans_start(db, MCO_READ_ONLY, MCO_TRANS_FOREGROUND, &t);
    if (rc)
    {
        return rc;
    }

    rc = cppdemo::Part::ByType::cursor(t, &csr);
    if (rc)
    {
        return rc;
    }

    rc = cppdemo::Part::ByType::search(t, &csr, MCO_GE, type, (uint2)strlen(type) + 1, "", 0); 
                                       // empty name here for positioninig

    for (; rc == MCO_S_OK; rc = mco_cursor_next(t, &csr))
    {
        MyPart part;

        part.from_cursor(t, &csr);
        if (strcmp(part.type(), type) != 0)
        {
            break;
        }

        part.print(t);
    }

    mco_trans_rollback(t); // read-only trn
    return rc;
}



int main(void)
{
    MCO_RET rc;
    mco_db_h db1;


    _SH_();
    printf("I am a CPP demo\n");


    printf("\neXtremeDB runtime version %d.%d, build %d\n\n", MCO_COMP_VER_MAJOR, MCO_COMP_VER_MINOR,
           MCO_COMP_BUILD_NUM);
    char* start_mem = new char[SEGSZ];

    mco_runtime_start();

    rc = mco_db_open(dbname, cppdemo_get_dictionary(), start_mem, SEGSZ, PAGESIZE);
    checkrc(rc);

    rc = mco_db_connect(dbname, &db1);
    checkrc(rc);

    populate_db(db1);

    printPartsOfTheType(db1, "23");

    rc = mco_db_disconnect(db1);

    rc = mco_db_close(dbname);

    mco_runtime_stop();

    delete [](start_mem);

    printf("Bye now!\n");

    return 0;
}