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Written by Kevin Wilson
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Thursday, 17 July 2008 |
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ABAP system fields are always available in ABAP programs. The runtime system fills them according to context. They can then be used in programs to query the system status. System fields are variables but you should always treat them as though they were constants, and only read them. If you change their values, important information for the flow of the program may be lost. In exceptional circumstances, system fields may be overwritten in an ABAP program to control the system – for example, SY-LSIND (for navigating to a detail list). With one exception the names and data types of the system fields are stored in the ABAP Dictionary in the SYST structure and realized as components of the predefined structure SY in ABAP programs. The system field SY-REPID is not part of SYST or SY. Instead, every program contains the predefined constants SY-REPID and SYST-REPID, which both contain the name of the corresponding program. Furthermore, there are two predefined types of the same name, SY-REPID and SYST-REPID. All system fields are addressed using SY field name and their types using SYST field name.
Alphabetical Overview The following table lists the definitions of the structure SYST in the ABAP Dictionary alphabetically. | Name | Type | Length | Use | Description | | ABCDE | CHAR | 26 | Constants | Alphabet (A,B,C,...) | | BATCH | CHAR | 1 | Background processing | Program runs in the background | | BINPT | CHAR | 1 | Batch input | Program runs under batch input | | CALLD | CHAR | 1 | ABAP Program | Call mode of ABAP program | | CALLR | CHAR | 8 | Printing Lists | ID for print dialog function | | COLNO | INT4 | 10 | Creating Lists | Current column in the list | | CPAGE | INT4 | 10 | List processing | Current page number | | CPROG | CHAR | 40 | ABAP Program | External procedure call | | CUCOL | INT4 | 10 | Screens | Horizontal cursor position at PAI | | CUROW | INT4 | 10 | Screens | Vertical cursor position at PAI | | DATAR | CHAR | 1 | Screens | Displays user input | | DATLO | DATS | 8 | Date and time | Local date of user | | DATUM | DATS | 8 | Date and time | Current (application server) date | | DAYST | CHAR | 1 | Date and time | Daylight saving time flag | | DBCNT | INT4 | 10 | Database accesses | Number of processed table rows | | DBNAM | CHAR | 20 | ABAP Program | Linked logical database | | DBSYS | CHAR | 10 | R/3 System | Name of central database system | | DYNGR | CHAR | 4 | ABAP Program | Screen group of current screen | | DYNNR | CHAR | 4 | ABAP Program | Number of current screen | | FDAYW | INT1 | 3 | Date and time | Factory calendar weekday | | FDPOS | INT4 | 10 | Character strings | Offset in character strings | | HOST | CHAR | 8 | R/3 System | Name of application server | | INDEX | INT4 | 10 | Loops | Current loop pass | | LANGU | LANG | 1 | R/3 System | Current language | | LDBPG | CHAR | 40 | ABAP Program | Program of logical database | | LILLI | INT4 | 10 | List processing | Selected list row | | LINCT | INT4 | 10 | Creating Lists | Page length of list | | LINNO | INT4 | 10 | Creating Lists | Current row | | LINSZ | INT4 | 10 | Creating Lists | Column width of list | | LISEL | CHAR | 255 | List processing | Content of selected row | | LISTI | INT4 | 10 | List processing | Index of selected list | | LOOPC | INT4 | 10 | Screens | Number of rows visible in table | | LSIND | INT4 | 10 | List processing | Index of detail list | | LSTAT | CHAR | 16 | List processing | ID for list levels | | MACOL | INT4 | 10 | Printing Lists | Columns from SET MARGIN statement | | MANDT | CLNT | 3 | R/3 System | Client number from logon | | MAROW | INT4 | 10 | Printing Lists | Rows from SET MARGIN statement | | MODNO | CHAR | 1 | R/3 System | Index of external modes | | MSGID | CHAR | 20 | Messages | Message class | | MSGLI | CHAR | 60 | Messages | Message line | | MSGNO | NUMC | 3 | Messages | Message number | | MSGTY | CHAR | 1 | Messages | Message type | | MSGV1 | CHAR | 50 | Messages | Message variable | | MSGV2 | CHAR | 50 | Messages | Message variable | | MSGV3 | CHAR | 50 | Messages | Message variable | | MSGV4 | CHAR | 50 | Messages | Message variable | | OPSYS | CHAR | 10 | R/3 System | Operating system of application server | | PAART | | |
