Changing Data Types and Lengths of Existing Fields. The ABAP Dictionary centrally describes and manages all the data definitions used. List of SAP tables (Customizing & Operational) – Sorted by Category Overview of Important SAP Tables ABAP / Data Dictionary Business Address Services. A data dictionary is a central source of information for the data in a information management system. Its main function is to support the creation.
|Language:||English, Spanish, French|
|ePub File Size:||28.50 MB|
|PDF File Size:||9.78 MB|
|Distribution:||Free* [*Sign up for free]|
The domain is a crucial concept in the ABAP Data Dictionary, because it defines the technical attributes of a table field such as data types, lengths, decimal. Data contained in this document serves informational purposes only. UNIT 2 Data Types in the ABAP. Dictionary. Lesson 1: Creating Domains and Data. ABAP/4 Dictionary. Q. What is a “DATA DICTIONARY”? A data dictionary is a central source of information for the data in a data management system. Its.
Exercise 2. Explicitly list this restriction in the domain for the hourly rate. Step 3: Then click the Change button. Step 4: Go to the Value range tab. Step 5: Enter 5 as the lower limit and 35 as the upper limit. Enter a short text describing the limit. Step 6: Click the Save icon to save your changes.
Fields are not independent objects: they are dependent on tables and can therefore only be maintained within a table; they refer to data elements.
Each data element is dependent on the existence of a domain. Data Elements determine how a field is displayed to the end-user.
These are objects in their own rights and appear in the object browser as separately. And since they are objects, once defined they can be reused within the same table or among fields in other tables in the dictionary. It describes exactly one role of a domain in a particular business context for its dependent fields. It describes the technical attributes and the meaning of a table field or a structure field.
It also contains the semantic Information of a field.
Semantic Information includes Field labels for displaying. The domain is the central object for describing the technical characteristics of an attribute of a business object.
It describes the value range of a field. This is determined by specifying formal characteristics such as external format, length and so on. In addition, specifying fixed values or a value table can restrict the value range. Domains can be defined without further references to other Dictionary objects. Like Data Elements, Domains are also stored as objects in the Dictionary. And you can reuse the Domain object for different fields within the same table or among fields in other tables.
These relationships are known as foreign keys and must be explicitly defined at field level. Foreign keys are used above all to ensure the consistency of data.
Data entered should be checked against existing data to ensure that there are no contradictions. For example: assignment of a printer that does not exist. A combination of fields of a table is identified as a foreign key if this combination is a primary key in another table. A foreign key provides a link between two tables T1 and T2.
Both the tables should have the same field names existing in them. In table T1 there is a reference to the primary key of table T2. In T1, the foreign key fields are assigned to the primary key fields of T2. The table to be checked i. Table T1 is called the foreign key table dependent table and table T2 is called the check table referenced table.
The fields from the two tables, which are paired to form the foreign key relationship, should be of the same data type and length. In other word one foreign key from one table should correspond with the primary key of the other table.
If a foreign key is defined between two tables, a record of the foreign key table refers to a record of the check table. A record is identified via its key, so in the foreign key definition in the foreign key field it is sufficient to refer to the primary key of the check table.
The requirement that the domain be the same applies only to the foreign key definition for the check field. For all other foreign key fields, it is sufficient if the data class and field lengths are the same.
You should nevertheless ensure that the domain is the same. When the field length is changed, the foreign key remains consistent, because both the assigned fields have been changed same domain. When the domains are not the same, the foreign key becomes inconsistent when the field length, for example, is changed.
The technical settings are used to optimize individually the space requirements and access behavior of database tables. The technical settings can be used to determine how the table should be treated when it is created in the database, whether the table is buffered and whether changes to entries should be logged.
The necessary information on which memory area tablespace to select and the probable table size are determined from the settings for the data class and size category. LANG: Language key.
Has its own field format for special functions. This data type always has length 1. The language key is displayed at the user interface with 2 places, but is only stored with 1 place in the database. The conversion exit ISOLA converts the display at the user interface for the database and vice versa. This conversion exit is automatically allocated to a domain with data type LANG at activation.
LCHR: Character string of any length, but with a minimum of characters. Fields of this type must be located at the end of transparent tables and must be preceded by a length field of type INT2. LRAW: Uninterpreted byte string of any length, but with a minimum length of The length of this field is limited to a maximum of places.
The length is set to 2 places for this data type. QUAN: Quantity. A field of this type must always refer to a unit field with UNIT format reference field. RAW: Uninterpreted byte string. Fields of type RAW may have only a maximum length of in tables.
If longer raw fields are required in tables, you should select data type LRAW. It cannot be used in database tables. In ABAP, this type is implemented as a reference to a storage area of variable size.
This data type can only be used in types data elements, structures, table types and domains.
TIMS: Time. The length is set to 6 places for this data type. The format is hhmmss. For Example: '' will be displayed as ' UNIT: Unit.
Fields of this type are referenced by fields of type QUAN. The length of this data type is set to 2 or 3 places. VARC: Character field of variable length. Creation of new fields of this data type is not supported as of Release 3.
However, existing fields with this data type can still be used. The output length number of places and the number of necessary editing character such as comma separated thousand and decimal points is greater than the specified length. System automatically calculates output length when defined in domain.
However, if the length specified in domain is less than the calculated output length, system will omit the editing characters.
This data type is used to represent character types. The 'internal' length of the LANG fields is in the dictionary, the 'external' length refers to the display on the screen. Both the declarations provide the same functionalities which define the user defined types according to the business and program requirement.
We can do so either locally in program or we can create a data element and use that data element in program. This command will declare the variable locally in the ABAP program.
Characters' as User defined data types can be further classified into three categories. The elementary type has semantic attribute such as data type, length, texts, value tables, documentation etc. Elementary types are described by the Data Elements. Data type can be specified in two ways. You can directly assign a predefined ABAP Dictionary type and a number of characters to an elementary type.
The technical attributes are inherited from the domain. Domain specifies the technical specification of the data element. Reference Data Types Reference types describe the data objects that contain references pointers to other objects data objects and objects in ABAP Objects. However there exist no predefined references- you have to define them explicitly.
There is a hierarchy of the reference types that describes the hierarchy of objects to which references can point. Complex Data Types Complex types are made up of other types. You can access a complex data types either as a whole or by the individual component. Complex data types group semantically related data under the single name and manage and process them.
There are no predefined complex data types defined in ABAP.
Examples of Complex Data Types: Let us consider some examples of complex data types which are arranged in ascending order of complexity. Structures consisting of a series of elementary data types of fixed length. An internal table whose line type is an elementary type. Internal table whose line type is a non-nested structure. Structure with structures as components.
Data Browser SE General table Display SE Table View Maintenance SM Table Maintenance. What is SAP Data services? SAP PP process is related to production planning of a company and it SAP Tutorials. Net C CodeIgniter. Blockchain Go Programming Reviews.