Question

How can I get MySQL_TIME from select query?

Asked by: rrahulgupta

Hi Experts,

I'm using MySQL database.
How can I get MySQL_TIME from select query against a table which has a column which datatype is TIMESTAMP?

-Rahul

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Asked On
2006-12-18 at 13:52:03ID22097194
Tags

mysql_time

Topic

C Programming Language

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: x4uPosted on 2006-12-18 at 17:43:26ID: 18163218

Here is a complete example for this at the end the page:
http://dev.mysql.com/doc/refman/5.1/en/mysql-stmt-fetch.html

 

by: rrahulguptaPosted on 2006-12-18 at 18:47:45ID: 18163398

Hi!

But this with prepared satatement that I'm not using. I'm using simple statement in select query.

================
    res = mysql_use_result(conn);
    int ul_grp_id = 0;
    char ch_grp_name[17];
    MySQL_TIME mt;
    while ((row = mysql_fetch_row(res)) != NULL)
    {
         ul_grp_id = atoi(row[0]);
         strncpy(ch_grp_name,row[1],17);
         // mt = row[2];                                                                                            // Datatype of this column in TimeStamp, how can I get it?
         ++i;        
    }
================
So, my question is same.

-Rahul

 

by: x4uPosted on 2006-12-19 at 02:10:14ID: 18164564

In this case you get strings only and need to do the conversion yourself. You can use the strptime function which is declared in <time.h> to do this. It uses a struct tm type instead of MySQL_TIME with slighly different semantics. In a struct tm the month is 0 based while in MySQL_TIME it's 1 based and the year 0 in struct tm is actually the year 1900.

The format pattern depends on the formatting of TIMESTAMP in your mysql installation.
Here is an example for a format that looks like YYYYMMDDHHMMSS

struct tm ts;
if ( strptime( row[ 2 ], "%Y%m%d%H%M%S", &ts ) )
{
    printf( "year: %d, month: %d, day: %d, hour: %d ...\n", ( ts.tm_year + 1900 ), ( ts.tm_mon + 1 ), ts.tm_mday, tm.tm_hour );
}

http://www.scit.wlv.ac.uk/cgi-bin/mansec?3C+strptime

 

by: rrahulguptaPosted on 2006-12-20 at 07:27:35ID: 18173774

Thanks for the response.

When I compile this, undefined reference to `strptime', linker error is coming.
When other functions declayered in time.h are woring fine.

Does it need any other library to include?

FYI, I'm working on devc++ on windows machine.

-Rahul

 

by: x4uPosted on 2006-12-20 at 09:31:37ID: 18174735

Looks like Windows doesn't implement this function although it's part of the POSIX API.

But as you need to parse only numbers you can easily replace strptime with sscanf. And as you need to specify all fields seperatly in this case, you can as well parse it into a MYSQL_TIME struct with a 4 digit year and a 1-based month.

Here is an example how to do this for the YYYYMMDDHHMMSS format. If you use a different format you need to adopt the format string for sscanf.

MYSQL_TIME mt;

sscanf_s( row[ 2 ], "%4d%2d%2d%2d%2d%2d", &mt.year, &mt.month, &mt.day, &mt.hour, &mt.minute, &mt.second );
mt.time_type = MYSQL_TIMESTAMP_DATETIME;
mt.neg = FALSE;

It doesn't make a functional difference whether you use the newer sscanf_s or the classic sscanf here, but newer Microsoft compilers will give you a warning if you don't use the _s version.

 

by: rrahulguptaPosted on 2006-12-20 at 11:58:30ID: 18175809

Thanks x4u, it's working.

20120131-EE-VQP-002

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