Mssql storedprocedure and jdbc

Question

Hello Java Gurus,
I am having a hard time to make a simple call to a sql stored procedure and make use of its returned value. what am i doing wrong in my code below.
float balance = -1;
Connection cnn = null;
CallableStatement cstmt = null;
ResultSet rs = null;
try {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
catch(Exception e) {
System.err.println(e.getMessage());
cnn = DriverManager.getConnection("jdbc:odbc:DemoApp;uid=sa;pw=password");
cstmt = cnn.prepareCall("{call proc_Purchase(?,?,?)}");
cstmt.setDouble(1,.03);
cstmt.setInt(2, 508);
cstmt.setString(3, "Wal-Mart");
cstmt.executeUpdate();
rs = cstmt.getResultSet();
balance = rs.getFloat(1);
System.err.println("Remaining balance is: " + balance);
cstmt.close();
cnn.close();
catch (SQLException e) {
System.err.println("Error occured " + e.getMessage());
System.err.println("more info.. " );
e.printStackTrace();
cnn.close();
I get a "No row count was produced" error.
my sp is working just fine, i have pasted it below.., the table is updated just fine with the java app however i cannot get the returned balance from the stored procedure.
ALTER PROCEDURE [DBO].[proc_Purchase]
(@Amount float, @ID int, @Description varchar(50))
AS
--set nocount on
--check if limit has not reached, if so return -1
if ((select sum(Amount) from tblTransaction where [ID] = @ID) + @Amount) >
(select Limit from tblUserData where [ID] = @ID)
     select -1 as AvailBalance
--update transaction and return available balance.
else
begin
     insert into tblTransaction ([ID],[Description],Amount)
     Values (@ID,@Description,@Amount)
     select(select Limit from tblUserData where [ID] = @ID) -
     (select sum(Amount) from tblTransaction where [ID] = @ID)as AvailBalance
end
Thank you!!

Answer 1

Does the stored procedure have an output variable?
CREATE PROCEDURE myProcedure
@myvalue1 int,
@myvalue2 int,
@myvalue3 int,
@myoutput float output
Then use CallableStatement.registerOutParameter to register the 4th value.
String myCall = "{ call myProcedure(?,?,?,?)}";
cstmt = conn.prepareCall(rxExchange);
cstmt.registerOutParameter(4,Types.FLOAT);
Then to execute and get the value:
cstmt.setInt(1,45);
cstmt.setInt(2,23);
cstmt.setInt(3,982);
cstmt.execute();
Float myFloat = cstmt.getFloat(4);