ToC path:

mco_calc_iinfo_browse

Browse through the calculator indexes.

Prototype

 
    MCO_RET mco_calc_iinfo_browse(	/*IN*/ mco_calc_t * calc,
                      /*IN*/ mco_calc_iinfo_h handler,
                      /*IN*/ void * data);

Arguments

calc	A handle to the initialized calculator object
handler	A user supplied handler function to process the class information
data	A pointer to user supplied data

Description

This function browses through calculator indexes, one index at time, and calls the user supplied handler function to process (print or perform some calculation with) the index information. Additional application-specific data may be passed into the handler function via parameter data.

Return Codes

MCO_S_OK	The class statistics were collected successfully
MCO_E_TRANSACT	A transaction was in an error state during calculator processing

Example

 
    Application snippet:
        
     
    const char * dbname = "calc_db";
     
    static void index_print(mco_calc_t *calc, mco_cc_t *cls,
                    mco_index_stat_t *istat, void *unused)
    {
        int tmp, psize = 0;
        char *str = NULL, c;
 
        if ((istat->type & MCO_IDXST_TYPE_MASK) == MCO_IDXST_TYPE_MEM) {
            str = "Inmem";
            psize = calc->pg_size;
        }
        else if ((istat->type & MCO_IDXST_TYPE_MASK) == MCO_IDXST_TYPE_DISK) {
            str = "Disk";
            psize = _disk_page_size;
        }
 
        printf(" -> %s [%s ", istat->plabel, str);
        ...
    }
 
    int main(int argc, char* argv[])
    {
        MCO_RET            rc;
        mco_device_t       dev;
        mco_calc_t calc;
        mco_db_params_t    db_params;
        mco_cc_info_t info;
         
        mco_runtime_start();
        ...
        mco_calc_init(&calc, calc_db_get_dictionary());
        ...
        rc = mco_db_open_dev( dbname, simple_get_dictionary(), &dev, 1, &db_params );
        if ( MCO_S_OK != rc )
        {
            rc = mco_db_connect(  dbname, &calc.db );
            ...
            rc = mco_calc_reg_schema_classes(&calc, calc_db_get_calculator());
            ...
            rc = mco_calc_fill_db(&calc);
            ...
            rc = mco_calc_stat_collect(&calc);
            ...
            printf("\Index info:\n");
            rc = mco_calc_iinfo_browse(&calc, index_print, (void*)0);
        
            ...
             
            /* NOTE: calculator *must* be deinitialized before you disconnect from the database */
            mco_calc_deinit(&calc);
         
            mco_db_disconnect(calc.db);
        }
    }

For further implementation details see SDK sample "samples/native/core/17-statistics/dbcalc".

Files

Header file:

mcodbcalc.h

Source file:

mcodbcalc.c

Library:

libmcodbcalc.a