ABAP Select data from SAP table CRMST_L2_HDFLOW into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CRMST_L2_HDFLOW 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 CRMST_L2_HDFLOW. 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 CRMST_L2_HDFLOW 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_CRMST_L2_HDFLOW TYPE STANDARD TABLE OF CRMST_L2_HDFLOW,
      WA_CRMST_L2_HDFLOW TYPE CRMST_L2_HDFLOW,
      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: <CRMST_L2_HDFLOW> TYPE CRMST_L2_HDFLOW.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CRMST_L2_HDFLOW.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CRMST_L2_HDFLOW
  INTO TABLE IT_CRMST_L2_HDFLOW.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRMST_L2_HDFLOW
*  INTO TABLE @DATA(IT_CRMST_L2_HDFLOW2).
*--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_CRMST_L2_HDFLOW INDEX 1 INTO DATA(WA_CRMST_L2_HDFLOW2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CRMST_L2_HDFLOW ASSIGNING <CRMST_L2_HDFLOW>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CRMST_L2_HDFLOW>-VBELN_N = 1.
<CRMST_L2_HDFLOW>-VBTYP_N = 1.
<CRMST_L2_HDFLOW>-VBELN_V = 1.
<CRMST_L2_HDFLOW>-VBTYP_V = 1.
<CRMST_L2_HDFLOW>-DESCRIPTION = 1.

ENDLOOP.

LOOP AT IT_CRMST_L2_HDFLOW INTO WA_CRMST_L2_HDFLOW.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CRMST_L2_HDFLOW-HLEVEL, sy-vline,
  WA_CRMST_L2_HDFLOW-VKORG, sy-vline,
  WA_CRMST_L2_HDFLOW-VTWEG, sy-vline,
  WA_CRMST_L2_HDFLOW-ERDAT, sy-vline,
  WA_CRMST_L2_HDFLOW-ERZET, sy-vline,
  WA_CRMST_L2_HDFLOW-STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CRMST_L2_HDFLOW 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_CRMST_L2_HDFLOW 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_CRMST_L2_HDFLOW INTO WA_CRMST_L2_HDFLOW.


*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 VBELN_N
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CRMST_L2_HDFLOW-VBELN_N
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CRMST_L2_HDFLOW-VBELN_N.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN_V
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CRMST_L2_HDFLOW-VBELN_V
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CRMST_L2_HDFLOW-VBELN_V.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CRMST_L2_HDFLOW-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CRMST_L2_HDFLOW-MJAHR.
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_CRMST_L2_HDFLOW_STR, 
VBELN_N TYPE STRING,
VBTYP_N TYPE STRING,
VBELN_V TYPE STRING,
VBTYP_V TYPE STRING,
DESCRIPTION TYPE STRING,
HLEVEL TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
STATUS TYPE STRING,
BWART TYPE STRING,
BUKRS TYPE STRING,
MJAHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRMST_L2_HDFLOW_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_CRMST_L2_HDFLOW_STR-VBELN_N sy-vline 
WA_CRMST_L2_HDFLOW_STR-VBTYP_N sy-vline 
WA_CRMST_L2_HDFLOW_STR-VBELN_V sy-vline 
WA_CRMST_L2_HDFLOW_STR-VBTYP_V sy-vline 
WA_CRMST_L2_HDFLOW_STR-DESCRIPTION sy-vline 
WA_CRMST_L2_HDFLOW_STR-HLEVEL sy-vline 
WA_CRMST_L2_HDFLOW_STR-VKORG sy-vline 
WA_CRMST_L2_HDFLOW_STR-VTWEG sy-vline 
WA_CRMST_L2_HDFLOW_STR-ERDAT sy-vline 
WA_CRMST_L2_HDFLOW_STR-ERZET sy-vline 
WA_CRMST_L2_HDFLOW_STR-STATUS sy-vline 
WA_CRMST_L2_HDFLOW_STR-BWART sy-vline 
WA_CRMST_L2_HDFLOW_STR-BUKRS sy-vline 
WA_CRMST_L2_HDFLOW_STR-MJAHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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