What if i need more than one prepareStatements per connection

Question

hi all!!
Please take some time to look into this scenario.
On the front end: User enters/ updates his/her records and submits. An ArrayList of object goes to backend.
On back end: i have to loop for the size of the ArrayList submitted and see if some record is to be updated or inserted.
Now at back end i do following steps:
I have only one Connection object named connection.
Step 1:
query (say query1 )to see if the record in DB exists for the primary key as extracted from the element from ArrayList. So one prepareStatment ( say prepareStatement1) for this. I write a query and execute :
prepareStatment1= connection.prepareStatement(query1);
Step2 :
A query ( say query2) to update Data in DB. And i have a separtae prepareStatement for this and i execute
prepareStatment2 = connection.prepareStatement(query2);
Sep3
A query (say query3 )to insert Data in DB. And i have a separtae prepareStatement for this and i execute
prepareStatment3 = connection.prepareStatement(query3);
Step4:
for: size of arraylist:
1. take out the element at ith index from the list.
2. see if the record exists i.e execute step1 and see if resultSet.next() is true.
3. if record exists step2 applies so execute update query
4. if record doesnot exist then go to step3 and execute insert query
A weird thing happened .. insert was running fine but update was not. May be i was not checking appropriately. BUT the error that occurrd was that
[Microsoft][ODBC SQL Server Driver]Connection is busy with
results for another hstmt.
So i changed my path and in loop i prepareStatement and execute query to see if record exists or not and store the result in some boolean variable and then close this prepareStatement. and if the result existed again prepare a statement for update or else prepare a statement for insert and execute the respective.
and then again close this prepareStatement and go for next iteration of loop
so each iteration i am preparing statement and then closing it BECAUSE Connection doesnot allow more than one statement per connection at one time. Am i right.??
what should i do.? Although i have solved problem by closing and preparing in loop but that is so inefficient. Is there some elegant way???
please reply.
PS: I am using ms sql server 8.0 as my DBMS. I am developing web application using Sun Creator.

Answer 1

No, you can use as many PreparedStatements as you like, all from one Connection, and you can keep them open as long as you like. (I do this with no problems.) Where you will run into problems is when you are trying to use two ResultSets at the same time. That's what the error message means, it just doesn't use JDBC terminology.