ABAP Select data from SAP table TKEBWLGN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TKEBWLGN table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to TKEBWLGN. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the TKEBWLGN table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_TKEBWLGN TYPE STANDARD TABLE OF TKEBWLGN,
      WA_TKEBWLGN TYPE TKEBWLGN,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <TKEBWLGN> TYPE TKEBWLGN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TKEBWLGN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TKEBWLGN
  INTO TABLE IT_TKEBWLGN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKEBWLGN
*  INTO TABLE @DATA(IT_TKEBWLGN2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_TKEBWLGN INDEX 1 INTO DATA(WA_TKEBWLGN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TKEBWLGN ASSIGNING <TKEBWLGN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKEBWLGN>-ISOURCE = 1.
<TKEBWLGN>-SLOGSYS = 1.
<TKEBWLGN>-TRANSTRUC = 1.
<TKEBWLGN>-REPSTATUS = 1.
<TKEBWLGN>-APPLCLASS = 1.

ENDLOOP.

LOOP AT IT_TKEBWLGN INTO WA_TKEBWLGN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKEBWLGN-SUBCLASS, sy-vline,
  WA_TKEBWLGN-TABNAME, sy-vline,
  WA_TKEBWLGN-TRCATNR, sy-vline,
  WA_TKEBWLGN-AEDAT, sy-vline,
  WA_TKEBWLGN-AETIM, sy-vline,
  WA_TKEBWLGN-AENAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKEBWLGN you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_TKEBWLGN TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_TKEBWLGN INTO WA_TKEBWLGN.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field SLOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TKEBWLGN-SLOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TKEBWLGN-SLOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RLOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TKEBWLGN-RLOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TKEBWLGN-RLOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CHGRUN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TKEBWLGN-CHGRUN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TKEBWLGN-CHGRUN.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_TKEBWLGN_STR, 
ISOURCE TYPE STRING,
SLOGSYS TYPE STRING,
TRANSTRUC TYPE STRING,
REPSTATUS TYPE STRING,
APPLCLASS TYPE STRING,
SUBCLASS TYPE STRING,
TABNAME TYPE STRING,
TRCATNR TYPE STRING,
AEDAT TYPE STRING,
AETIM TYPE STRING,
AENAM TYPE STRING,
GENDELTA TYPE STRING,
RLOGSYS TYPE STRING,
REQUNR TYPE STRING,
REQUSUBNR TYPE STRING,
TS_LOW TYPE STRING,
TS_HIGH TYPE STRING,
ANZAHL TYPE STRING,
SDATE TYPE STRING,
STIME TYPE STRING,
EDATE TYPE STRING,
ETIME TYPE STRING,
NRREAD TYPE STRING,
NRSENT TYPE STRING,
UENUM TYPE STRING,
SAPRL TYPE STRING,
CHGRUN TYPE STRING,
ACTIVITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKEBWLGN_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_TKEBWLGN_STR-ISOURCE sy-vline 
WA_TKEBWLGN_STR-SLOGSYS sy-vline 
WA_TKEBWLGN_STR-TRANSTRUC sy-vline 
WA_TKEBWLGN_STR-REPSTATUS sy-vline 
WA_TKEBWLGN_STR-APPLCLASS sy-vline 
WA_TKEBWLGN_STR-SUBCLASS sy-vline 
WA_TKEBWLGN_STR-TABNAME sy-vline 
WA_TKEBWLGN_STR-TRCATNR sy-vline 
WA_TKEBWLGN_STR-AEDAT sy-vline 
WA_TKEBWLGN_STR-AETIM sy-vline 
WA_TKEBWLGN_STR-AENAM sy-vline 
WA_TKEBWLGN_STR-GENDELTA sy-vline 
WA_TKEBWLGN_STR-RLOGSYS sy-vline 
WA_TKEBWLGN_STR-REQUNR sy-vline 
WA_TKEBWLGN_STR-REQUSUBNR sy-vline 
WA_TKEBWLGN_STR-TS_LOW sy-vline 
WA_TKEBWLGN_STR-TS_HIGH sy-vline 
WA_TKEBWLGN_STR-ANZAHL sy-vline 
WA_TKEBWLGN_STR-SDATE sy-vline 
WA_TKEBWLGN_STR-STIME sy-vline 
WA_TKEBWLGN_STR-EDATE sy-vline 
WA_TKEBWLGN_STR-ETIME sy-vline 
WA_TKEBWLGN_STR-NRREAD sy-vline 
WA_TKEBWLGN_STR-NRSENT sy-vline 
WA_TKEBWLGN_STR-UENUM sy-vline 
WA_TKEBWLGN_STR-SAPRL sy-vline 
WA_TKEBWLGN_STR-CHGRUN sy-vline 
WA_TKEBWLGN_STR-ACTIVITY sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.