ABAP Select data from SAP table LTAP_HU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LTAP_HU
*  INTO TABLE @DATA(IT_LTAP_HU2).
*--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_LTAP_HU INDEX 1 INTO DATA(WA_LTAP_HU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LTAP_HU>-LGNUM = 1.
<LTAP_HU>-TANUM = 1.
<LTAP_HU>-TAPOS = 1.
<LTAP_HU>-PAPOS = 1.
<LTAP_HU>-VONHU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LTAP_HU-NACHU, sy-vline,
  WA_LTAP_HU-HUENT, sy-vline,
  WA_LTAP_HU-MENGA, sy-vline,
  WA_LTAP_HU-ALTME, sy-vline,
  WA_LTAP_HU-MENGE, sy-vline,
  WA_LTAP_HU-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LTAP_HU 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_LTAP_HU 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_LTAP_HU INTO WA_LTAP_HU.


*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 VONHU
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LTAP_HU-VONHU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTAP_HU-VONHU.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field ALTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LTAP_HU-ALTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTAP_HU-ALTME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LTAP_HU-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTAP_HU-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field /CWM/VEMEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LTAP_HU-/CWM/VEMEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTAP_HU-/CWM/VEMEH.
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_LTAP_HU_STR, 
LGNUM TYPE STRING,
TANUM TYPE STRING,
TAPOS TYPE STRING,
PAPOS TYPE STRING,
VONHU TYPE STRING,
NACHU TYPE STRING,
HUENT TYPE STRING,
MENGA TYPE STRING,
ALTME TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
DMGEA TYPE STRING,
DMENG TYPE STRING,
VLEVL TYPE STRING,
VLEER TYPE STRING,
SELKZ TYPE STRING,
NHUDI TYPE STRING,
/CWM/VEMNG TYPE STRING,
/CWM/VEMEH TYPE STRING,
/CWM/DIFMG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LTAP_HU_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_LTAP_HU_STR-LGNUM sy-vline 
WA_LTAP_HU_STR-TANUM sy-vline 
WA_LTAP_HU_STR-TAPOS sy-vline 
WA_LTAP_HU_STR-PAPOS sy-vline 
WA_LTAP_HU_STR-VONHU sy-vline 
WA_LTAP_HU_STR-NACHU sy-vline 
WA_LTAP_HU_STR-HUENT sy-vline 
WA_LTAP_HU_STR-MENGA sy-vline 
WA_LTAP_HU_STR-ALTME sy-vline 
WA_LTAP_HU_STR-MENGE sy-vline 
WA_LTAP_HU_STR-MEINS sy-vline 
WA_LTAP_HU_STR-DMGEA sy-vline 
WA_LTAP_HU_STR-DMENG sy-vline 
WA_LTAP_HU_STR-VLEVL sy-vline 
WA_LTAP_HU_STR-VLEER sy-vline 
WA_LTAP_HU_STR-SELKZ sy-vline 
WA_LTAP_HU_STR-NHUDI sy-vline 
WA_LTAP_HU_STR-/CWM/VEMNG sy-vline 
WA_LTAP_HU_STR-/CWM/VEMEH sy-vline 
WA_LTAP_HU_STR-/CWM/DIFMG sy-vline      INTO ld_text SEPARATED BY SPACE.

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