Question

c#, sql, passing parameters in stored procedure

Asked by: R8VI

Hi,

I have the follwoign code

     public static DataSet GetQ(string[] qID, bool[] answer)
        {
            Database db = DatabaseFactory.CreateDatabase();
            DBCommandWrapper CW = db.GetStoredProcCommandWrapper(C.S.GAnswers);


            CW.AddInParameter("@ID", DbType.Int32, qID);
            CW.AddInParameter("@Answer", DbType.Boolean, answer);
            DataSet ds;


            ds = db.ExecuteDataSet(CW);

            return ds;

        }

that bascially goes to the DB calls the stored prod Ganswers and pass the variables and returns data.

my question is that the first time round string [] qid and bool[] answer will only have one data in each at array 0 but second time round it will have two pieces of data in both at array point 0 and 1

so how do i design my stored procedure so that first time it take 2 arguments qid and answer but then second time round it take 4 arguments 2 from qid and 2 from answer.


This is what i have so far in the stored prod

select * from x
where qid <> @id and answer= @answer

bascially i need to check first as well if answer array has true then keep answer= @answer else answer<> @answer  


please help

Thanks,

R8VI

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Asked On
2009-09-03 at 09:48:36ID24705216
Tags

c#

,

asp.net

,

sql

Topics

.NET

,

C# Programming Language

,

SQL Server 2005

Participating Experts
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Points
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Comments
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Answers

 

by: DanielWilsonPosted on 2009-09-03 at 09:55:28ID: 25252554

Stored Procedures (under SQL Server at least) do not take variable numbers of parameters.  You can declare optional parameters, but that will take you only so far.  I get the idea you want, not just 4 parameters, but potentially LOTS of them.  Basically, if you could pass the arrays to the SP, you would.

But you can't.

So ... can you explain the table structure and requirement so that we can come up with an alternate solution?

 

by: R8VIPosted on 2009-09-03 at 10:04:14ID: 25252642

right this is the system. its a questions naire.
all answers are yes or no simple

Users see first question are you a footballer
users answers no.
users sees next questions are you a basketballer
user answer no
are u a tennis player
users answer yes
and so

no i have a List<Quetion> that stores all the questions and answers as they get answered.

This is where the problem begins the next question from the DB is derieved from the previous questionid =qid in the above example and the answer = answer previous example.

So thats 2  parameters no problem. but then when it comes to the third question i need to get this question based on the first two answers so could be yes and no.

and they both get stored in the answer []

so thats the exact problem

What can i do

Thanks,

For the help so far

R8VI

 

by: robkolskyPosted on 2009-09-03 at 11:19:06ID: 25253351

You could store the data you want in a single string separated by pipes (or some other delimiter). You'll need an SQL split function to make that work (and the right to add user defined functions to your SQL server). You can then split the data from the passed in string and loop through it with a cursor because it turns your string into multiple records in a table variable. Here is a forum talking about various split functions.

If you need to pass in both the question id and answer for each question I would still do it this way, i would just have two delimiters. i.e. "q1Id^abc|q2Id^def|q3id^ghi"

You can then split first on the pipe, use a cursor to go through those, and then split the value in each record again on ^ or use substring to split the second value because you know it always has two parts (before the ^ and after the ^). Then you can perform your query for each record split by the pipe

http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=50648

 

by: DanielWilsonPosted on 2009-09-03 at 12:26:44ID: 25254053

Why pass all the answers to the stored procedure each time?  Why not pass the last answer along with the ID of the question to which it belongs?

 

by: badgerfirePosted on 2009-09-03 at 13:12:50ID: 25254458

It is not difficult.  I created classes that called upon SQL Procedures.  

The following code is an example of how to call the connection and send the procedue with parameters

This particular procedure did an Add, Edit, Delete.
I had others that returned a dataset using the simular code.

        public void ManageWBS(
                Int32 iSKWBS,
                Int32 iFKProject,
                String sWBS,
                String sWBSTitle)
        {
            SqlConnection conn = new SqlConnection(Session["ConnectionString"].ToString().ToString());
 
            String sqlout = "procManageWBS";
            SqlCommand cmd = new SqlCommand(sqlout, conn);
            cmd.CommandType = CommandType.StoredProcedure;
 
            cmd.Parameters.AddWithValue("@SKWBS", iSKWBS);
            cmd.Parameters.AddWithValue("@FkProject", iFKProject);
            cmd.Parameters.AddWithValue("@WBS", sWBS);
            cmd.Parameters.AddWithValue("@WBSTitle", sWBSTitle);
 
            cmd.Connection.Open();
            cmd.ExecuteNonQuery();
            cmd.Connection.Close();
        }

                                              
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