ABAP Select data from SAP table GRACALACTLOG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GRACALACTLOG 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 GRACALACTLOG. 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 GRACALACTLOG 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_GRACALACTLOG TYPE STANDARD TABLE OF GRACALACTLOG,
      WA_GRACALACTLOG TYPE GRACALACTLOG,
      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: <GRACALACTLOG> TYPE GRACALACTLOG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GRACALACTLOG
*  INTO TABLE @DATA(IT_GRACALACTLOG2).
*--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_GRACALACTLOG INDEX 1 INTO DATA(WA_GRACALACTLOG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GRACALACTLOG>-MANDT = 1.
<GRACALACTLOG>-CONNECTOR = 1.
<GRACALACTLOG>-USERID = 1.
<GRACALACTLOG>-ACTION = 1.
<GRACALACTLOG>-LASTEXECUTEDON = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GRACALACTLOG-TERMINALNAME, sy-vline,
  WA_GRACALACTLOG-EXECUTIONCOUNT, sy-vline,
  WA_GRACALACTLOG-DELETEDACTION, sy-vline,
  WA_GRACALACTLOG-DELETEDBY, sy-vline,
  WA_GRACALACTLOG-DELETEDON, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_GRACALACTLOG 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_GRACALACTLOG 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_GRACALACTLOG INTO WA_GRACALACTLOG.


*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 TSTPS, internal->external for field LASTEXECUTEDON
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_GRACALACTLOG-LASTEXECUTEDON
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GRACALACTLOG-LASTEXECUTEDON.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTPS, internal->external for field DELETEDON
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_GRACALACTLOG-DELETEDON
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GRACALACTLOG-DELETEDON.
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_GRACALACTLOG_STR, 
MANDT TYPE STRING,
CONNECTOR TYPE STRING,
USERID TYPE STRING,
ACTION TYPE STRING,
LASTEXECUTEDON TYPE STRING,
TERMINALNAME TYPE STRING,
EXECUTIONCOUNT TYPE STRING,
DELETEDACTION TYPE STRING,
DELETEDBY TYPE STRING,
DELETEDON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GRACALACTLOG_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_GRACALACTLOG_STR-MANDT sy-vline 
WA_GRACALACTLOG_STR-CONNECTOR sy-vline 
WA_GRACALACTLOG_STR-USERID sy-vline 
WA_GRACALACTLOG_STR-ACTION sy-vline 
WA_GRACALACTLOG_STR-LASTEXECUTEDON sy-vline 
WA_GRACALACTLOG_STR-TERMINALNAME sy-vline 
WA_GRACALACTLOG_STR-EXECUTIONCOUNT sy-vline 
WA_GRACALACTLOG_STR-DELETEDACTION sy-vline 
WA_GRACALACTLOG_STR-DELETEDBY sy-vline 
WA_GRACALACTLOG_STR-DELETEDON sy-vline      INTO ld_text SEPARATED BY SPACE.

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