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15 .Distributed computation summarizes 1

Before the study that begins this one share,We come first brief answer what is distributed computation,Discuss why to want to use distributed calculation next.

Distributed calculative English is Distributed Computing.If we say some job is distributed,So,The scarcely that shares this work is a computer only,However network of a computer.Our computer has two kinds of functions,It is it can store lay aside information,Perhaps call data;Another function is the ability that it can process data,It can be calculated.By this one classification,The work that we can do computer network place divides two kinds:Distributed data puts store,Distributed computation.

14 .3 SQL statement

14 .3.1 CLOSE CURSOR

The syntactic format of CLOSE CURSOR is:

CLOSE CURSORNAME;

The opens by OPEN cursor that shuts CURSORNAME delegate,The cursor that using cannot be shut.After retrieving normally, be equal to in SQLCode 100 when use,Had better detect after carrying out this statement shut successful.

14 .Language of 2 POWER SCRIPT

14 .2.1 assignment statement

The assignment statement is OK the result an expression is variable perhaps with the value of constant,The ode gives a variable or the attribute of the object or member variable.The format of the assignment statement is:

14 .1 noun

14 .1 .1 annotate goes

Annotate uses a book to write a specification all right,It has two kinds to write a law:

With " / / " begin,Write annotate content ever since,Commonly used at one-way annotate.

13 .4 gives wrong processing

When ? program moves as a result of systematic environment different,The moving requirement that often can not satisfy applied process,Spark systematic error incident.To enhance the consistence of the program,We need to making mistake information undertakes handling.Specific means is the error of SYSTEM ERROR system that using program target the basis is different wrong type among incident script undertakes appropriate processing,Offer for the user adjust the moving environment, method that solves a mistake,The job that makes a procedure can normal thereby rises.

13 .3 runs wrong explanation

When the program is finished not completely still,Moving program often can appear mistake,Spark the SYSTEM ERROR incident of PB,If do not have promising,these wrong incident write script,Can spark show casing of such a message.The number that its information includes erroneous information and text,Which group of the script that tells us the which incident that is which object appeared mistake.It is to debug a program,The important basis of modification mistake,The specific meaning that so we are necessary to understand these wrong message well.

13 .2 is debugged

Stop when the program after the breakpoint that installs beforehand,We can see such interface.If pursue 4.

Our familiar script palette is above.The window that this one column is the observation program moving data that provides for programmer below.We see a few label,Every label is representing a group of variable.

13.1 installs breakpoint

Installing breakpoint is the basic measure that debugs a program.How to install a breakpoint?Click the DEBUG above POWER BAR to debug pushbutton,Screen is played gave script to choose the window.The 13-1 that be like a graph.

12 .3 prints function

POWER BUILDER provided ten a few function that print.The use that we introduce a few commonly used function below.

PrintOpen

PrintOpen function opens an operation that print,And allocate to date of its exercise that print,Between the following program we can use name of this work that print.It can accept a string as parameter,The name that this string shows the work that print.

12 .2 is printed in the program

How to provide the function that print in the program?The pattern that there are three kinds to transfer the function that print here can offer an alternative.

1.To data the window is controlled or data window can use this kind of form that print.