ABAP Select data from SAP table TMCL_LV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TMCL_LV
*  INTO TABLE @DATA(IT_TMCL_LV2).
*--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_TMCL_LV INDEX 1 INTO DATA(WA_TMCL_LV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TMCL_LV>-MANDT = 1.
<TMCL_LV>-GEWEH = 1.
<TMCL_LV>-VOLEH = 1.
<TMCL_LV>-PROTO = 1.
<TMCL_LV>-SALORE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TMCL_LV-DELIVE, sy-vline,
  WA_TMCL_LV-PURORE, sy-vline,
  WA_TMCL_LV-INFGES, sy-vline,
  WA_TMCL_LV-INF1, sy-vline,
  WA_TMCL_LV-INF2, sy-vline,
  WA_TMCL_LV-INF3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TMCL_LV 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_TMCL_LV 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_TMCL_LV INTO WA_TMCL_LV.


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

*Conversion exit CUNIT, internal->external for field VOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_TMCL_LV-VOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TMCL_LV-VOLEH.
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_TMCL_LV_STR, 
MANDT TYPE STRING,
GEWEH TYPE STRING,
VOLEH TYPE STRING,
PROTO TYPE STRING,
SALORE TYPE STRING,
DELIVE TYPE STRING,
PURORE TYPE STRING,
INFGES TYPE STRING,
INF1 TYPE STRING,
INF2 TYPE STRING,
INF3 TYPE STRING,
INF4 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TMCL_LV_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_TMCL_LV_STR-MANDT sy-vline 
WA_TMCL_LV_STR-GEWEH sy-vline 
WA_TMCL_LV_STR-VOLEH sy-vline 
WA_TMCL_LV_STR-PROTO sy-vline 
WA_TMCL_LV_STR-SALORE sy-vline 
WA_TMCL_LV_STR-DELIVE sy-vline 
WA_TMCL_LV_STR-PURORE sy-vline 
WA_TMCL_LV_STR-INFGES sy-vline 
WA_TMCL_LV_STR-INF1 sy-vline 
WA_TMCL_LV_STR-INF2 sy-vline 
WA_TMCL_LV_STR-INF3 sy-vline 
WA_TMCL_LV_STR-INF4 sy-vline      INTO ld_text SEPARATED BY SPACE.

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