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SQL Anywhere 11.0.1 (Deutsch) » SQL Anywhere Server - Programmierung » SQL Anywhere Datenzugriff-APIs » SQL Anywhere C-API-Referenz » SQL Anywhere C-APIBeispiele

 

fetching_a_result_set.cpp

Dieses Beispiel zeigt, wie Sie Daten aus einer Ergebnismenge abrufen.

// *********************************************************************
// Copyright 1994-2008 iAnywhere Solutions, Inc.  All rights reserved.
// This sample code is provided AS IS, without warranty or liability
// of any kind.
//
// You may use, reproduce, modify and distribute this sample code
// without limitation, on the condition that you retain the foregoing
// copyright notice and disclaimer as to the original iAnywhere code.
//
// *********************************************************************
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "sacapidll.h"

int main( )
{
    SQLAnywhereInterface  api;
    a_sqlany_connection * conn;
    a_sqlany_stmt       * stmt;
    unsigned int          max_api_ver;

    if( !sqlany_initialize_interface( &api, NULL ) ) {
        printf( "Could not initialize the interface!\n" );
        exit( 0 );
    }

    if( !api.sqlany_init( "MyAPP", SQLANY_CURRENT_API_VERSION, &max_api_ver ) ) {
        printf( "Failed to initialize the interface! Supported version=%d\n", max_api_ver );
        sqlany_finalize_interface( &api );
        return -1;
    }

    /* A connection object needs to be created first */
    conn = api.sqlany_new_connection();

    if( !api.sqlany_connect( conn, "uid=dba;pwd=sql" ) ) {
        api.sqlany_free_connection( conn );
        api.sqlany_fini();
        sqlany_finalize_interface( &api );
        exit( -1 );
    }

    printf( "Connected successfully!\n" );


    if( (stmt = api.sqlany_execute_direct( conn, "select * from systable" )) != NULL ) {
        int                     num_rows = 0;
        a_sqlany_data_value     value;

        while( api.sqlany_fetch_next( stmt ) ) {

            num_rows++;
            printf( "\nRow [%d] data .......\n", num_rows );
            for( int I = 0; I < api.sqlany_num_cols( stmt ); I++ ) {
                int rc = api.sqlany_get_column( stmt, I, &value );

                if( rc < 0 ) {
                    printf( "Truncation of column %d\n", I );
                }
                if( *(value.is_null) ) {
                    printf( "Received a NULL value\n" );
                    continue;
                }

                switch( value.type ) {
                    case A_BINARY:
                        printf( "Binary value of length %d.\n", *(value.length) );
                        break;
                    case A_STRING:
                        printf( "String value [%.*s] of length %d.\n",
                                *(value.length), (char *)value.buffer, *(value.length) );
                        break;
                    case A_VAL64:
                        printf( "A_VAL64 value [%lld].\n", *(long long *)value.buffer );
                        break;
                    case A_UVAL64:
                        printf( "A_UVAL64 value [%lld].\n", *(unsigned long long *)value.buffer );
                        break;
                    case A_VAL32:
                        printf( "A_VAL32 value [%d].\n", *(int*)value.buffer );
                        break;
                    case A_UVAL32:
                        printf( "A_UVAL32 value [%d].\n", *(unsigned int*)value.buffer );
                        break;
                    case A_VAL16:
                        printf( "A_VAL16 value [%d].\n", *(short*)value.buffer );
                        break;
                    case A_UVAL16:
                        printf( "A_UVAL16 value [%d].\n", *(unsigned short*)value.buffer );
                        break;
                    case A_VAL8:
                        printf( "A_VAL8 value [%d].\n", *(char *)value.buffer );
                        break;
                    case A_UVAL8:
                        printf( "A_UVAL8 value [%d].\n", *(unsigned char *)value.buffer );
                        break;
                }
                /* do some processing with the data ... */
            }
        }

        /* Must free the result set object when done with it */
        api.sqlany_free_stmt( stmt );
    }
    api.sqlany_disconnect( conn );

    /* Must free the connection object or there will be a memory leak */
    api.sqlany_free_connection( conn );

    api.sqlany_fini();

    sqlany_finalize_interface( &api );

    return 0;
}