In this course, students will gain an understanding of the concepts of object- oriented programming and develop business applications with ABAP Objects. BC ABAP – Ebook download as PDF File .pdf), Text File .txt) or read book online. Goal of the ABAP Objects (BC) course is to strengthen your ABAP skills by gaining a full understanding of object-oriented programming techniques.
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Skip to main content. Log In Sign Up. BC Col23 Object Programming. All other products mentioned are trademarks or registered trademarks of their respective companies. There is space baap you to write down additional information on the sheets. The exercises are intended as additional examples of the topics discussed during the course. Participants can also use them as an aid to enhancing their knowledge after the course has finished.
The type is linked to the data object statically and cannot be changed at runtime. Some of these ABAP types are fully specified and can be used to type data objects directly.
Other types need to be modified to include the length, and in some cases the number of decimal places so that they are fully specified.
These are the simplest examples of user-defined types. Thus, for these two types, length is not a component of the type. We will deal with this topic in greater detail later in this unit. The name of the type group can contain up to 5 characters.
You only have to adhere to the following namespace convention: All constants and type names must have the name of the type group as a prefix. After this line in the program, you can then use all the constants in the type group. The connection between value range and length is derived from the internal representation: Each decimal digit is represented by a half-byte.
The last gc401 is reserved for the wbap or minus sign. The maximum number of decimal places is either 15 or the length of the number minus 1 that is, there must be at least one digit before the comma.
Packed numbers are thus well-suited to business calculations, where the correct rounding for the specified number of decimal places is very important. The algorithm for this arithmetic is similar to using “pencil and paper”. Internally, all numbers are interpreted as integers, regardless of the position of the decimal point. The fixed point arithmetic option is always bc41 by default.
Floating bf401 numbers are also normalized, and both the exponent and the mantissa are stored in binary form. This representation complies with the IEEE norm for double precision floating point numbers. The floating point operations of the relevant processors are used for calculations. Since algorithms are converted to binary, inaccuracies can occur. Therefore, floating point numbers are QRW suitable for business calculations. The answer should be The ABAP runtime system contains an arithmetic for each of the three data types.
The system then performs the calculation and converts it into the data type of the result field. The values are converted to numeric type objects. Bc40 in mind that conversions affect performance. Wherever possible, choose a data type that does QRW require runtime conversion. If the bc40 is within the value range for the data type L, ahap numeric literal is interpreted as an integer. If the value of the literal is greater thanit is interpreted as a packed number.
Internally, each character is represented by a code cb401. When the system outputs the character, it uses the code page to convert this number. Note, however, that only digits are permissible as characters. When character strings are assigned to numeric strings, the system ignores letters and only copies the digits right-aligned.
Missing characters are filled with zeros. These digits form a meaningful date, which complies with the Gregorian calendar. The first four digits represent the year, the next two the month and the last two the date. For performance reasons however, the object ahap only checked if it is an input field on a screen or selection screen. The formatting options are determined by the user settings. Wbap rules for interpreting the value are analogous to those used for dates.
There are special comparison operators for strings, which you can use in logical expressions in a queryto search more flexibly for character sequences in a character string. For more information, see the keyword documentation for. No internal type conversions take place. abwp
Bc – abap objects |
You do not need to specify the number of parts into which the string should be split. If the field lengths are different, the system either truncates the target or fills it with initial values. The syntax is similar to the definition of a structure type. If you use this option, the corresponding structure type is defined implicitly at the same time. Bear in mind that you can also use globally defined types instead. For this reason, you should avoid using hyphens in variable names.
These structures are known as GHHS structures. Instead, each component must be listed separately. Offset operations are also not appropriate. For more information, refer to SAP Note You do this using named includes: This is due to the difference between the length in bytes and the number of characters in a character set in Unicode.
Existing programs are affected by a conversion to Unicode if an explicit or implicit assumption is made about the internal length of a character.
If the Unicode flag is set for a program, the syntax check and program are executed in accordance with the rules described in the Unicode online help irrespective of whether it is a Unicode or a non-Unicode system. For such programs, the Unicode-specific changes of syntax and semantics do not apply. However, you can use all language enhancements introduced in connection with the conversion to Unicode.
In non-Unicode systems, a character of this type is one byte and in Unicode systems, it is as long as corresponds with the length of a character on the relevant platform. If arguments of another type are transferred, this triggers a syntax or runtime error.
Again, character-type structures are also permitted. In the memory, fields of this type must begin and end on specific addresses – for example, a memory address divisible by four. Adjacent byte-type components are grouped in the same way. All other components in the remainder are filled with the type-specific initial value, alignment gaps are filled with null bytes. The conversion then takes place between the first character-type group of the structure and the single field.
If the structure is the target field, the character-type parts of the remainder are filled with space characters and all other components with the type-specific initial value.
Internal tables can be converted if their row type can be converted. If a date is assigned to this structure using the statement, the characters are then copied left-aligned.
You can then determine the year, month, and day directly using the components of the structure, without having to use offsets. This means, the access will cause an error if the offset and length area contains both character-type and bc410 components. Bear in mind that processing component qbap component and using character string operations is generally safer and more readable.
The program will split the this character string into its components and display it formatted in a list. Because the focus of this exercise is not on the transfer of data as a character string, we will use a function module that will provide bc41 with the required database. This will simulate actual cases, such as data transfer from an external system.
Pay special attention to the content of the data object datastring after the function module call. The function module itself is here seen as a black box. For this exercise, it is not necessary to understand its construction. Remove the two leading separators from the character string first. You still have to comment out the components of this structure type and assign them an appropriate type.
Your next step is to change this. To do this, convert the data you have extracted by copying it to data objects with suitable types. The data is stored line by line in memory.
Each line has the same structure.
You refer to each line in the internal table as a table line or table entry. The number of lines in an internal table is limited only by the capacity of the specific system with which you are working. You must assign a name and type to each column. You generally define a line type using a structure type.
The key is defined by: Each kind has different attributes, which specify whether the key is unique, how the index is managed, and how the table data is addressed internally.
The table kind specifies the possible accesses.