.NET/ASP.NET/C#/VB.NET PDF Document SDK

scott@ORA10G> create or replace package body opt_lock_save_old_val_demo 2 as 3 procedure get_emp_details( p_empno in number, p_ename in out varchar2, 4 p_sal in out number ) 5 is 6 begin 7 select ename, sal 8 into p_ename, p_sal 9 from emp 10 where empno = p_empno; 11 end; 12 The procedure update_emp_info updates the salary and the name with the new values. It also has the where clause criteria to compare the existing ename and sal columns with their older values that we obtain using the preceding get_emp_details procedure: 13 procedure update_emp_info( p_empno in number, p_old_ename in varchar2, p_old_sal in number, p_new_ename in varchar2, p_new_sal in number, p_num_of_rows_updated in out number ) is begin p_num_of_rows_updated := 0; update emp set sal = p_new_sal, ename = p_new_ename where empno = p_empno and ename = p_old_ename and sal = p_old_sal; p_num_of_rows_updated := sql%rowcount; end; end; /

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Use an interop assembly to expose functionality, or use vendor provided interop assemblies, such as the Office interop assemblies from Microsoft.

of wildcard patterns effectively disables this analysis for any particular pattern match. Sometimes it is better to write out the extra cases of a match as explicit patterns, because you can then adjust your code when new kinds of input data are introduced.

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Package body created. Notice that the procedure update_emp_info also returns the number of rows successfully updated so that the calling code can detect if the update was successful. We will now demonstrate optimistic locking at work by calling these two procedures from the following Java class, DemoOptLockingBySavingOldValues. We begin the class definition with the required import statements, followed by the main() method that begins with obtaining the database connection: /* This program demonstrates optimistic locking by saving old column values. * COMPATIBLITY NOTE: tested against 10.1.0.2.0.*/ import java.sql.SQLException; import java.sql.Connection; import java.sql.CallableStatement; import oracle.jdbc.OracleTypes;

You can write a custom listener process that accepts requests from a TCP channel or via HTTP You can also program it to expect binary or SOAP messages over your chosen channel. . These choices are independent. It s only when you re hosting a remoted component within ASP .NET that you re limited in these choices, as you are bound to the HTTP channel. However, this channel can still be used to send binary or SOAP messages. We ll take a look at all of these scenarios in the sections that follow. Remote objects can also be used to pass messages across application domains within a managed process. This is what Remoting is most highly optimized to accomplish, and is what Microsoft says is the best reason to adopt Remoting. See 6 and 9 for a discussion of some of the issues relating to Remoting versus Web Services (which is really a debate of RPC versus Service Oriented Architecture, or SOA). With the introduction of the Windows Communication Foundation (WCF), Microsoft is moving this concept of an extensible layer of transport and messaging into all out-of-process calls that are done in the operating system (see 9 for a preview of WCF). This is why WCF is called the unified out-of-process call stack. Today with WCF, Web Services requests can get passed via MSMQ as easily as they are via HTTP There are really a lot of valid combi. nations.

Individual rules of a match can be guarded by a condition that is executed if the pattern itself succeeds. Here is a simple use of this mechanism to record the three clauses of computing the sign of an integer: let sign x = match x with | _ when x < 0 -> -1 | _ when x > 0 -> 1 | _ -> 0 Two patterns can be combined to represent two possible paths for matching: let getValue a = match a with | (("lo" | "low") ,v) -> v | ("hi",v) | ("high",v) -> v | _ -> failwith "expected a both a high and low value";; Here the pattern ("lo" | "low") matches either string. The pattern ("hi",v) | ("high",v) plays essentially the same role by matching pairs values where the left of the pair is "hi" or "high" and by binding the value v on either side of the pattern.