fetch data from database using DATE ,TIME data type in mysql

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hi all...

i have table with columns
description,user,date(DATE),time(TIME)

i written Query Like:

SQL

SELECT * FROM `tbluser` where `date`<='" + DateTime.Now.ToString("yyyy-MM-dd") + "' and `time`<='" + DateTime.Now.ToString("hh:mm") + "' and user='" + txtuser.text + "'

but it wont fetch records less than the time how can i fetch records less then the correct date and time can any one please help me
thanks in advance...

Posted 14-Dec-11 18:52pm

tulasiram3975

Updated 14-Dec-11 18:57pm

v5

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Wendelius · Accepted Answer · 2011-12-14T19:00:00

Don't concatenate literals (date, text etc) to your SQL statements. Instead use MySqlParameter[^].

When that is done, set the proper datetime to the parameter as value and you should get correct results.

Addition:

Currently you have a query like:

SQL

SELECT * FROM `tbluser` where `date`<='" + DateTime.Now.ToString("yyyy-MM-dd") + "' and `time`<='" + DateTime.Now.ToString("hh:mm") + "' and user='" + txtuser.text + "'"

What you should do is to use parameter (see the link I provided) so your query would look something like:

SQL

SELECT * FROM `tbluser` where `date`<= @date and `time`<=@time and user=@user"

After that modification you define proper values for all of the three parameters via C# (as in the example).

I'm not sure but it looks like you may actually store dates and times in the database as character information. If that is true, then you should correct the table structure and define a single datetime field in your table and use that instead. See: http://dev.mysql.com/doc/refman/5.0/en/date-and-time-types.html[^]

If that is done your query could look something like:

SQL

SELECT * FROM `tbluser` 
where datetimefield <= @datetimetosearch 
and user=@user"

That would eliminate the problems for having the date and time information in separate fields and possibly conversion problems if you currently use character data type.