ABAP Select data from SAP table HITAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HITAB
*  INTO TABLE @DATA(IT_HITAB2).
*--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_HITAB INDEX 1 INTO DATA(WA_HITAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HITAB>-OBJFR = 1.
<HITAB>-OBJTO = 1.
<HITAB>-EBENE = 1.
<HITAB>-TEXT = 1.
<HITAB>-ATTRIBUTES = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HITAB-ATTR1B, sy-vline,
  WA_HITAB-ATTR1E, sy-vline,
  WA_HITAB-ATTR1S, sy-vline,
  WA_HITAB-ATTR2B, sy-vline,
  WA_HITAB-ATTR2E, sy-vline,
  WA_HITAB-ATTR2S, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HITAB 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_HITAB 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_HITAB INTO WA_HITAB.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_HITAB_STR, 
OBJFR TYPE STRING,
OBJTO TYPE STRING,
EBENE TYPE STRING,
TEXT TYPE STRING,
ATTRIBUTES TYPE STRING,
ATTR1B TYPE STRING,
ATTR1E TYPE STRING,
ATTR1S TYPE STRING,
ATTR2B TYPE STRING,
ATTR2E TYPE STRING,
ATTR2S TYPE STRING,
ATTR3B TYPE STRING,
ATTR3E TYPE STRING,
ATTR3S TYPE STRING,
NO_SUB TYPE STRING,
IMPLODE TYPE STRING,
EXPLODE TYPE STRING,
VISIBLE TYPE STRING,
MARKED TYPE STRING,
LOG_MARKED TYPE STRING,
NO_CHANGE TYPE STRING,
LAST_CHILD TYPE STRING,
FOUND TYPE STRING,
MODIFIED TYPE STRING,
ORIG_OUTL TYPE STRING,
GOT_INFO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HITAB_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_HITAB_STR-OBJFR sy-vline 
WA_HITAB_STR-OBJTO sy-vline 
WA_HITAB_STR-EBENE sy-vline 
WA_HITAB_STR-TEXT sy-vline 
WA_HITAB_STR-ATTRIBUTES sy-vline 
WA_HITAB_STR-ATTR1B sy-vline 
WA_HITAB_STR-ATTR1E sy-vline 
WA_HITAB_STR-ATTR1S sy-vline 
WA_HITAB_STR-ATTR2B sy-vline 
WA_HITAB_STR-ATTR2E sy-vline 
WA_HITAB_STR-ATTR2S sy-vline 
WA_HITAB_STR-ATTR3B sy-vline 
WA_HITAB_STR-ATTR3E sy-vline 
WA_HITAB_STR-ATTR3S sy-vline 
WA_HITAB_STR-NO_SUB sy-vline 
WA_HITAB_STR-IMPLODE sy-vline 
WA_HITAB_STR-EXPLODE sy-vline 
WA_HITAB_STR-VISIBLE sy-vline 
WA_HITAB_STR-MARKED sy-vline 
WA_HITAB_STR-LOG_MARKED sy-vline 
WA_HITAB_STR-NO_CHANGE sy-vline 
WA_HITAB_STR-LAST_CHILD sy-vline 
WA_HITAB_STR-FOUND sy-vline 
WA_HITAB_STR-MODIFIED sy-vline 
WA_HITAB_STR-ORIG_OUTL sy-vline 
WA_HITAB_STR-GOT_INFO sy-vline      INTO ld_text SEPARATED BY SPACE.

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