Trying to understand a callable statement

Question

i am having trouble understanding CallableStatements
i have this code
Connection conn = null;
try
     conn = OdLauncher.getDbConnection(USERID, PWD, SERVER);     
     CallableStatement cs = conn.prepareCall("{? = CALL " + QUERYPROC + "(?)}");
     //what do i set???
     //what do i register???
     cs.registerOutParameter(1,Types.INTEGER);
     cs.executeQuery();
     System.out.println("cs " + cs);
catch(Exception e)
     e.printStackTrace();
}what i am trying to do is query a stored proc to return a result set
but im having trouble trying to figure out what the difference is between
setting like setString(1, somethinghere);
and registering
cs.registerOutParameter(1,Types.INTEGER);
i am not sure what it is i set and what it is i register???

Answer 1

CallableStatement cs = conn.prepareCall("{? = CALL "
" + QUERYPROC + "(?)}");In this form of syntax for the CallableStatement, the first question-mark [parameter] is the output parameter which is obtained from a RETURN within the stored procedure. For all I know, it is usually an integer to indicate the code [for success or error]. By registering the parameter for output, you can obtain the return value after the execution of the stored procedure using getInt().
As opposed to this the setString() [or whatever yoyu would use for the other parameter] is an input to the stored procedure. I think this is mentioned in the API documentation too.