ABAP Select data from SAP table ROIRC_MRH_CHECK_B_ALV1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ROIRC_MRH_CHECK_B_ALV1 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 ROIRC_MRH_CHECK_B_ALV1. 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 ROIRC_MRH_CHECK_B_ALV1 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_ROIRC_MRH_CHECK_B_ALV1 TYPE STANDARD TABLE OF ROIRC_MRH_CHECK_B_ALV1,
      WA_ROIRC_MRH_CHECK_B_ALV1 TYPE ROIRC_MRH_CHECK_B_ALV1,
      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: <ROIRC_MRH_CHECK_B_ALV1> TYPE ROIRC_MRH_CHECK_B_ALV1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ROIRC_MRH_CHECK_B_ALV1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ROIRC_MRH_CHECK_B_ALV1
  INTO TABLE IT_ROIRC_MRH_CHECK_B_ALV1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ROIRC_MRH_CHECK_B_ALV1
*  INTO TABLE @DATA(IT_ROIRC_MRH_CHECK_B_ALV12).
*--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_ROIRC_MRH_CHECK_B_ALV1 INDEX 1 INTO DATA(WA_ROIRC_MRH_CHECK_B_ALV12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ROIRC_MRH_CHECK_B_ALV1 ASSIGNING <ROIRC_MRH_CHECK_B_ALV1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ROIRC_MRH_CHECK_B_ALV1>-RNBT = 1.
<ROIRC_MRH_CHECK_B_ALV1>-MRDATE = 1.
<ROIRC_MRH_CHECK_B_ALV1>-PBLNR = 1.
<ROIRC_MRH_CHECK_B_ALV1>-MRTIME = 1.
<ROIRC_MRH_CHECK_B_ALV1>-METREV = 1.

ENDLOOP.

LOOP AT IT_ROIRC_MRH_CHECK_B_ALV1 INTO WA_ROIRC_MRH_CHECK_B_ALV1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ROIRC_MRH_CHECK_B_ALV1-MATNR, sy-vline,
  WA_ROIRC_MRH_CHECK_B_ALV1-SERVTYP, sy-vline,
  WA_ROIRC_MRH_CHECK_B_ALV1-MCOUNT, sy-vline,
  WA_ROIRC_MRH_CHECK_B_ALV1-KBETR, sy-vline,
  WA_ROIRC_MRH_CHECK_B_ALV1-KONWA, sy-vline,
  WA_ROIRC_MRH_CHECK_B_ALV1-KPEIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ROIRC_MRH_CHECK_B_ALV1 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_ROIRC_MRH_CHECK_B_ALV1 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_ROIRC_MRH_CHECK_B_ALV1 INTO WA_ROIRC_MRH_CHECK_B_ALV1.


*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 PBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ROIRC_MRH_CHECK_B_ALV1-PBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIRC_MRH_CHECK_B_ALV1-PBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ROIRC_MRH_CHECK_B_ALV1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIRC_MRH_CHECK_B_ALV1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field KMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ROIRC_MRH_CHECK_B_ALV1-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIRC_MRH_CHECK_B_ALV1-KMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SEQNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ROIRC_MRH_CHECK_B_ALV1-SEQNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIRC_MRH_CHECK_B_ALV1-SEQNR.
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_ROIRC_MRH_CHECK_B_ALV1_STR, 
RNBT TYPE STRING,
MRDATE TYPE STRING,
PBLNR TYPE STRING,
MRTIME TYPE STRING,
METREV TYPE STRING,
MATNR TYPE STRING,
SERVTYP TYPE STRING,
MCOUNT TYPE STRING,
KBETR TYPE STRING,
KONWA TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
MENGE TYPE STRING,
KWERT TYPE STRING,
SEQNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ROIRC_MRH_CHECK_B_ALV1_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_ROIRC_MRH_CHECK_B_ALV1_STR-RNBT sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-MRDATE sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-PBLNR sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-MRTIME sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-METREV sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-MATNR sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-SERVTYP sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-MCOUNT sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-KBETR sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-KONWA sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-KPEIN sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-KMEIN sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-MENGE sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-KWERT sy-vline 
WA_ROIRC_MRH_CHECK_B_ALV1_STR-SEQNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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