ABAP Help Document(9):3.2 系统对象

3.2预定义sy-数据对象

1.ABAP System Fields

示例：

"预定义data object
FORM f_pre_data_objects.
  "System Fields
  "Structure:SYST,
  "使用sy-xxxx,syst-xxxx,
*sy-abcde c 26 A-Z,26个字母
  WRITE:/ sy-abcde.
*sy-batch c 1 是否后台执行'X'
  WRITE:/ sy-batch.
*sy-binpt c 1 在批处理程序，CALL TRANSACTION USING调用程序中为“X”
  WRITE:/ sy-binpt.
*sy-calld c 1
  "CALL TRANSACTION, CALL DIALOG, or SUBMIT ... AND RETURN 设置为“X”
  "LEAVE TO TRANSACTION or Tcode enter in a screen 设置为空
  "SUBMIT 返回调用程序值
*sy-callr c 8
  "print list标明print开始点
*sy-colno i
  "Current position during the creation of a list in the list buffer.1开始;
*sy-cpage i
  "Page number of the top page in the list display where a list event was triggered.1开始;
*sy-cprog c 40
  "external procedure name or current program;
*sy-cucol i
  "Horizontal cursor position on the screen of a dynpro. Counting begins at column 2.
*sy-curow i
  "Vertical cursor position on the screen of a dynpro. Counting begins at line 1.
*sy-datar c 1
  ""X" for PAI, if at least one input field of a screen was changed by a user or some other data being passed.
*sy-datlo d
  "User date, for example "19990723"; can be set by GET TIME.
*sy-datum d
  "System date. Can be set by GET TIME.
*sy-dayst c 1
  ""X" in summer time in the system time zone; otherwise initial.
*sy-dbcnt i
  "SQL statements set the content of sy-dbcnt to the number of table rows processed.
*sy-dbnam c 20
  "For executable programs, the associated logical database.
*sy-dbsys c 10
  "Central database system, for example "ORACLE" or "INFORMIX".
*sy-dyngr c 4
  "Screen group of the current dynpro.
*sy-dynnr c 4
  "Number of the current dynpro.
*sy-fdayw b
  "Factory calendar weekday in the system time zone; Monday = 1, ..., Friday = 5.
*sy-fdpos i
  "Occurrence when using certain searches in character-like and byte-like data objects.
*sy-host c 32
  "Network name of the computer on which the current application server is instantiated,
  "for example "KSAP0001" or "HS01234".
*sy-index i
  "Loop index.
  "In DO and WHILE loops, contains the number of previous loop passes, including the current pass.
*sy-langu c 1
  "Single-character language key,
  "for example "E", "D", "F", for the current text environment.
  "Set by the logon language of the user or by the statement SET LOCALE.
*sy-ldbpg c 40
  "In executable programs, the database program of the associated logical database.
*sy-lilli i
  "List row on which a list event was triggered.
  "Counting begins at 1 and includes the page header.
*sy-linct i
  "Page length of the current list when the list is created.
  "sy-linct is 0 for a standard list of any length and has a value not equal to 0 for lists with fixed page lengths.
*sy-linno i
  "Current list row when the list is created.
  "Counting begins at 1 and includes the page header.
*sy-linsz i
  "Row width of the current list in the list buffer when the list is created.
*sy-lisel c 255
  "Content of the list row in the list buffer where the cursor was in the displayed list when a list event was triggered
  "(limited to the first 255 characters).
*sy-listi i
  "List level of the list in which a list event was triggered.
*sy-loopc i
  "Number of currently displayed rows in a table control.
*sy-lsind i
  "List level of the list that is currently being created
  "(basic list: 0, details lists: greater than 0).
  "For every interactive list event, sy-lsind is automatically increased by an increment of 1.
*sy-macol i\
  "Number of columns on the left margin when printing lists.
*sy-mandt c 3
  "Client ID used by the current user to log on, for example "401" or "800".
*sy-marow i\
  "Number of rows on the top margin when printing lists.
*sy-modno i
  "Indexing of the external sessions.
  "Contains the value 0 in the first session.
*sy-msgid c 20
  "After the statement MESSAGE, contains the message class.
*sy-msgno n 3 
　　"After the statement MESSAGE, contains the message number.
*sy-msgty c 1 
　　"After the statement MESSAGE, contains the message type.
*sy-msgv1 ... sy-msgv4 c 50
  "After the statement MESSAGE, contain the field content used for the placeholders of the message.
*sy-opsys c 10
  "Operating system of the current application server, for example "SOLARIS" or "HP-UX".
*sy-pagno i
  "Current page when the list is created.
*sy-pfkey c 20
  "GUI status of the current dynpro.
*sy-prdsn c 6
  "Contains the name of the spool file when printing.
*sy-repid c 40
  "Name of the current ABAP program In procedures called externally,
  "the name of the framework program of the procedure.
*sy-saprl c 4
  "AS ABAP release, for example "46D" or "610".
*sy-scols i
  "Number of columns in the current screen layout.
*sy-slset c 14
  "Variant used to fill a selection screen.
  "The associated program name can be seen in sy-cprog.
*sy-spono n 10
  "Contains the name of the spool number when printing lists.
*sy-srows i
  "Number of rows in the current screen layout.
*sy-staco i
  "Number of the first displayed column of the list in which a list event was triggered.
  "Counting begins at 1.
*sy-staro i
  "Number of the top displayed list row of the top displayed page of the list where a list event was triggered.
  "Counting begins at 1 and does not include the page header.
*sy-stepl i
  "Index of the current row in a table control.
  "This is set for every loop pass.
*sy-subrc i
  "Return code set by many ABAP statements. 执行代码是否成功
*sy-sysid c 8
  "Name of AS ABAP, for example "S01" or "K99".
*sy-tabix i
  "Row number in the table index of an internal table.
  "Contains the last row accessed using a primary or secondary table index.
  "Is set to 0 when accessed using a hash algorithm.
*sy-tcode c 20
  "Name of the current transaction code.
  "Initial in background processing, unless a transaction was called during background processing.
*sy-tfill i
  "In the statements DESCRIBE TABLE, LOOP AT, and READ TABLE,
  "sy-tfill is given the number of rows of the accessed internal table.
*sy-timlo t
  "User time, for example "152557". Can be set by GET TIME.
*sy-title c 70
  "Text that appears in the title bar of the dynpro.
*sy-tleng i
  "In the statements DESCRIBE TABLE, LOOP AT, and READ TABLE,
  "sy-tleng is given the row size of the accessed internal table.
*sy-tvar0 ... sy-tvar9 c 20
  "Values can be assigned to these system fields in the program.
  "In the event TOP-OF-PAGE, the content of sy-tvar0 through sy-tvar9 replaces
  "the placeholders "&0" through "&9" in the list headers and column headers of the text elements of the program.
*sy-tzone i
  "Time difference of the system time to the UTC reference time in seconds, for example "3600" or "10800".
*sy-ucomm c 70
  "Function code that triggered the event PAI.
*sy-uline c 255
  "Contains a horizontal line of the length 255 for displays in lists.
*sy-uname c 12
  "Logon name of the user, for example "KELLERH".
  "See also User-Specific Program Flow.
*sy-uzeit t
  "System time; can be set by GET TIME.
*sy-vline c 1
  "Contains a vertical line (|) for displays in lists.
*sy-wtitl c 1
  "Set to "N" in the statements REPORT, PROGRAM, and FUNCTION-POOL,
  "if the addition NO STANDARD PAGE HEADING is used; otherwise initial.
*sy-zonlo c 6
  "User time zone, for example "CET" or "PST".

"Constant space
"space type c length 1
  DATA:lv_str TYPE string.
  CONCATENATE space space INTO lv_str SEPARATED BY space.
ENDFORM.