The Function Builder in Software

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The Function Builder
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Function modules are general purpose routines created with ABAP code that are available for every developer and from any program. The function builder is the ABAP workbench tool which allows you to maintain, control, and perform centralized tests of the function modules.
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Function Builder Structure
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To understand more easily the functionality described in the next section, an introduction to the different components and concepts which make up the function builder management, both from the point of view of the tool (external view) as well as from the point of view of its internal construction (internal view), follows. External View From the point of view of the workbench tool, the function builder is made up of a group of functions. Every function group contains all the routines (function modules) which belong to that function group. A function group is a logical group of function modules having a common relationship among them and sharing a common programming context, such as global variables, at runtime. 236
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Function Builder Structure For every function module, the system independently manages the following elements: Administration Import/export parameter interface Table parameter/exceptions interface Documentation Source code Global data Main program Internal View For every function group, there is a corresponding main program. The system identifies this main program with the name SAPL<functgrp>, where <functgrp> corresponds to the function group name. For example, for the ZJRS group, the main program would be SAPLZJRS. This program includes references to include objects where the global data is defined for the function group, as well as the source code corresponding to every function module, the code for the subroutines, events, PAI modules, PBO modules, and so on. The include object where the global definition is stored is named as L<functgrp>TOP, for example, LZJRSTOP. This include will contain the FUNCTION POOL statement in the first line and then the common variable declaration section for all the function modules. The include object where the source code for every function module is defined is identified by the system with the name L<functgrp>UXX. For example, LZJRSUXX. Within this object there will be an include for every function module that belongs to the function group. This include is known as L<functgrp>Unn, where nn is a sequential number corresponding to each function module. Within this include, the function source code is located between the instructions FUNCTION <function name> in the first line and ENDFUNCTION in the last line. You can see some of these internal views in the Administration information. Administrative information about the specific function module Formal parameter list for the function module input/output together with its characteristics Identifies the tables which can be input/output (by reference) to the function module and the definition of the exceptions which are managed by the function module Possible documentation for the function module Contains the source code for the function module Contains the global data definition for the group of functions (common to all function modules belonging to the group) Contains the source code of the main program corresponding to the group of functions
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Working with the Function Builder
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To call the function builder main screen, from the ABAP workbench initial screen, click on the Function Builder button on the application toolbar. Alternatively, select Development Function Builder from the menu, or enter transaction code SE37 in the command field. Figure 7 29 shows the function builder initial screen. The next sections present the most common activities when working with the function builder, such as Displaying information about a function module Searching a specific function module Creating a function group Creating a function module 237
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Working with the Function Builder Checking and activating modules Testing modules Calling functions with RFC
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Figure 7 29: Function builder initial screen. Displaying Information about a Function Module To know the features and information about a function module, either when they are customer created or from the extensive collection of standard SAP function modules, you must enter the function name in the input field, click on the radio button belonging to the information type to display, and click on the Display button. The following options (radio buttons) are available for displaying information about function modules: Interface. Displays the following pages (as tabstrip options) Administrative information about the function module such as function group, application area, development class, process type, RFC calls, and so on Information on interface import parameters defined for a function module Information on interface export parameters defined for a function module Information on interface change parameters defined for a function module Information on interface export parameters defined for a function module Information on interface tables Information on interface export parameters defined for a function module Information on interface exceptions Function module and parameter documentation Source code. Presents the content of the include object L<functgrp> Unn corresponding to the function module being displayed Global data. Displays the include object SAPL<functgrp>TOP Main program. Displays the content of the main program belonging to the function group to which the function module belongs Searching for a Specific Function Module To search whether the function builder already has a function which might be useful for your current needs, you can select Utilities Find from the function builder initial screen. The system will present the initial screen for the information system corresponding to the function modules. This screen shows a collection of selection 238
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Working with the Function Builder fields in which you may enter some information to filter the search. Alternatively, you can click on the possible entries list arrow next to the Function module input field. The system will directly show the input help personal value list. Clicking on the Information system push button, you are presented with the same screen as if you had selected the Utilities Find function. Creating a Function Group If you need to create a new function group to which you want to assign new function modules, from the initial function builder screen, select Goto Function groups Create group. The system displays a screen where you can enter the code for the function group and a short description identifying it. By clicking on the Save icon the system will automatically generate the main program SAPL<functgrp> and the includes L<functgrp>TOP and L<functgrp>UXX. Creating a Function Module To create a function module, you must complete several steps. First, enter the name of the function module to be created in the function builder initial screen and click on the Create button. The system displays a dialog box where you enter the function group to which you want to assign the function module. In the Administration page of the Create function module screen, enter the following fields: Application. Allows you to relate the function module with a specific application area Short text. Brief description of the function module Copy from. Name of a function module (from a different function group) from which you want to copy: its ABAP source code, the interface definition, and the documentation Process type. Indicates how this function module can be executed: with normal calls, with remote function calls (RFC), or in an in update task process By clicking on the Save icon, the system will automatically edit the L<functgrp>UXX include and add a new include (L<functgrp>Unn) which corresponds to the function module and where nn is a sequential number corresponding to the order of creation of the function module within the function group: the first one will be 00, the second 01, and so on. Figure 7 30 shows an example of the administration screen for creating function modules, after the entered information has been saved.
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