database.txt

来自「mysql与vc的连接,添加,删除瞪问题」· 文本 代码 · 共 32 行

MYSQL_RES *result;                        //存放查询的记录结果集
unsigned int num_fields;                 //存放查询结果的总数
unsigned int num_rows;

if (mysql_query(&mysql,query_string))   //返回0查询成功，不然未知错误
{
    // error                             //未知错误
}
else // query succeeded, process any data returned by it
{
    result = mysql_store_result(&mysql);              //存放记录集合
    if (result)                     // there are rows   //有查询记录
    {
        num_fields = mysql_num_fields(result);          //记录总数
        // retrieve rows, then call mysql_free_result(result)
    }
    else  // mysql_store_result() returned nothing; should it have?
    {
        if(mysql_field_count(&mysql) == 0)              //非查询语句
        {
            // query does not return data
            // (it was not a SELECT)
            num_rows = mysql_affected_rows(&mysql);
        }
        else // mysql_store_result() should have returned data
        {
            fprintf(stderr, "Error: %s\n", mysql_error(&mysql));
        }
    }
}