Working with Complex Objects: The Aggregate Objects in Software

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Working with Complex Objects: The Aggregate Objects
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Figure 8 12: Domain with value table. You can set up if a field that refers to a defined domain is an input or an output field, as well as set the editing characteristics. This is useful when creating new screens. You can also control how the fields which refer to this domain are displayed during input/output with the following options: Decimal places. The number of places permitted after the decimal point for a value is defined here. This field is visible only when a numeric data type (DEC, FLTP, QUAN, and CURR) is chosen. Sign. If this field is selected, the first output position is reserved for a sign. This field is visible only when a numeric data type (DEC, FLTP, QUAN, and CURR) is chosen. Output length. Maximum field length including editing characters for input/output of the values. This value is computed automatically, but can be overwritten. Conversion routine. This field can be used to change the standard editing format for the values of a domain.
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Working with Complex Objects: The Aggregate Objects
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Up until here, previous sections explained how to work with the basic objects of the data dictionary. With the basic objects, the dictionary allows for defining more complex structures. For example, using domains and data elements you can define fields for tables and structures. Then, using one or more tables and their relationships, you can define other complex structures such as views, matchcodes, and lock objects, which are known in the SAP environment as aggregate objects.
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Aggregate objects are based on a table known as the primary table of the aggregate object. Other tables can be added to this primary table. These additional tables are known as secondary tables. The link between the primary tables and the secondary tables is established by means of foreign key relationships and join conditions. Transitive connections (use of intermediate tables) between a primary table and secondary tables are also possible. The following sections present how the aggregate objects are defined, using examples of creating views, matchcodes, and lock objects. You can obtain further information about these objects from the SAP online documentation in the ABAP dictionary section. However, the aim of this section is to present a useful introduction to understanding the main parts, mainly from the point of view of the R/3 administrator.
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A view is like a table but with no contents; it is a virtual table. A view is a definition based on the relationship between one or several tables using the permitted relational database operations, for example, select, join, or projections. A view does not physically contain any data. The information is dynamically generated when the view is used at runtime. The view is a useful method of offering a specific set of application data which can then be associated with certain parts of an application or even with different user profiles. Working with views allows for restricting or limiting the access to information by areas, employees, plants, and so forth. It offers application users the ability to display or manage the information which is really meaningful and useful for their work or the information for which they have access privileges. This process reduces the need to create new tables with just specific data for each application, which then increases the redundancy and is more costly to maintain. It is also one of the preferred methods for relating the specific modules of business applications which are otherwise logically separated. View Types The system offers the following types of views: Database view. This type is defined just the same way as it is defined in the underlying database. It can use one or several related tables. It supports the three relational operators: join, projection, and selection. Only tables of type transparent are allowed for this type of view. Projection view. This type allows you to suppress some fields from the display in a transparent table. The projection view is defined using only the relational operator projection. Update, insert, delete, and select operations can be performed. Structures. These are virtual tables that are made up of several tables. Structures are comparable with tables of type INTTAB, internal SAP tables. Help view. This type is used from transactions when additional help is needed. Help views are used exclusively by the SAP help system. All relational operators are supported. Access is only possible with the SAP help and cannot be seen with either the SAP Open SQL or the Native SQL. For the selection, a function module is generated. For help view definitions only 1:1 and 1:C relationships are possible. This type of view is activated using the F4 function key. Maintenance view. These views enable the maintenance of a group of related tables using standard SM30 transactions (extended table maintenance) and other special customizing transactions. Creating Views From the initial dictionary screen, enter the name of the view in the Object name input field and select the View radio button. Then, click on the Create push button. The system displays a dialog box requesting the type of view to create, as you can see in Fig. 8 13.
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