Help with processing groups of records in database

Question

Ok i'm at work right now trying to finish up a project for my class and what it is is a basic class to process an inner join sql statement generated table from access and order it by the student id in order to group each student together. I have written the sql statement and logic to access the database and return the array of row objects to the command line so i know it is grouping and returning info properly. I have written the conditional if statement to get the gradePoints for A = 4, B = 3, C = 2, D = 1, and F = 0 in a class method (KEEP IN MIND THE GENERATED TABLE CONSISTS OF SID, NAME, COURSE#, COURSETITLE, AND LETTERGRADE) now I just need to process each group of students individually and calculate their overall gpa's. Here in lies the problem. I imagine i need to define current student variables as like
currentID = s[0].getStudentID();
currentName = s[0].getStudentName();
then loop through the values of the array with something like
for(int j = 0; j < s; ++j)
if(s[j].getStudentID != currentID)
Process the grade records for the group Then reset the
current student to the next in line with another variable
assignment like
currentID = s[j].getStudentID();
currentName = s[j].getStudentName();
}(end of if)
Process the row object for the student created by this loop and then add it to the output string
} (end of for loop)
Ok so where i need help is the logic to process the grade records for the individual groups and then processing the row object. We haven't gone over anything like this in class and it is the last thing on my list to to do so any help would be appreciated. Also, if you think i'm an idiot keep it to yourself please it's not fun for people who really need help and really would like to know for future reference how to do something to be belittled. Thanks again
Matt
Message was edited by:
djmd02

Answer 1

sorry i guess is hopuld explain this better...I know
sql relatively well and the sql statement for my
query string is rediculously long with two inner
joins and what it returns is the sid, name,
coursenumber, coursename, and lettergrade So if you know SQL so well, why haven't you created a ViEW using this "ridiculously long" query and made your life easier?
Two inner joins? Nothing extraordinary about that.
this query
generated table is then used to populate an array of
objects for each entry in the table. They are already
put in order depending on sid by the sql statement
(for example)
11111 matt deClercq 3380 intro to java A
11111 matt deClercq 3382 database management A
11112 john doe 3380 intro to java A>
and so on. The problem i am having is within the for
loop to detect the end of each student and process
their grades for each class and calculate the gpa for
the whole group of grades that that student has.SQL is a declarative language, not procedural. If you're "looping", it suggests to me that you're pulling all that data into the middle tier and doing the calculation in Java.
I'm suggesting that there's a perfectly good way to do this calculation in SQL without using your ridiculous query. You might be better served if you try and figure out what that is.
Hope this makes things a little more clear and makes
me look a little bit more intelligent than i seemStop worrying about what people think and concentrate on your problem. You're a student. It's unlikely that you're going to appear to be on the level of Bill Joy at this point in your career. I'd be a lot more impressed if you'd stop whining about how people perceive you.
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