ABAP Select data from SAP table MMSES_APV_ACC_ASSIGNMENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMSES_APV_ACC_ASSIGNMENT
*  INTO TABLE @DATA(IT_MMSES_APV_ACC_ASSIGNMENT2).
*--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_MMSES_APV_ACC_ASSIGNMENT INDEX 1 INTO DATA(WA_MMSES_APV_ACC_ASSIGNMENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMSES_APV_ACC_ASSIGNMENT>-PACKNO = 1.
<MMSES_APV_ACC_ASSIGNMENT>-INTROW = 1.
<MMSES_APV_ACC_ASSIGNMENT>-ZEKKN = 1.
<MMSES_APV_ACC_ASSIGNMENT>-KOSTL = 1.
<MMSES_APV_ACC_ASSIGNMENT>-VBELN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMSES_APV_ACC_ASSIGNMENT-VBELP, sy-vline,
  WA_MMSES_APV_ACC_ASSIGNMENT-ANLN1, sy-vline,
  WA_MMSES_APV_ACC_ASSIGNMENT-AUFNR, sy-vline,
  WA_MMSES_APV_ACC_ASSIGNMENT-PS_PSP_PNR, sy-vline,
  WA_MMSES_APV_ACC_ASSIGNMENT-NPLNR, sy-vline,
  WA_MMSES_APV_ACC_ASSIGNMENT-KNTTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMSES_APV_ACC_ASSIGNMENT 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_MMSES_APV_ACC_ASSIGNMENT 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_MMSES_APV_ACC_ASSIGNMENT INTO WA_MMSES_APV_ACC_ASSIGNMENT.


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

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

*Conversion exit ALPHA, internal->external for field ANLN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMSES_APV_ACC_ASSIGNMENT-ANLN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMSES_APV_ACC_ASSIGNMENT-ANLN1.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MMSES_APV_ACC_ASSIGNMENT-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMSES_APV_ACC_ASSIGNMENT-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field GL_ACCOUNT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMSES_APV_ACC_ASSIGNMENT-GL_ACCOUNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMSES_APV_ACC_ASSIGNMENT-GL_ACCOUNT.
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_MMSES_APV_ACC_ASSIGNMENT_STR, 
PACKNO TYPE STRING,
INTROW TYPE STRING,
ZEKKN TYPE STRING,
KOSTL TYPE STRING,
VBELN TYPE STRING,
VBELP TYPE STRING,
ANLN1 TYPE STRING,
AUFNR TYPE STRING,
PS_PSP_PNR TYPE STRING,
NPLNR TYPE STRING,
KNTTX TYPE STRING,
ANLA_TEXT TYPE STRING,
POSKI TYPE STRING,
POST1 TYPE STRING,
AUFNR_TEXT TYPE STRING,
COST_CENTER_TEXT TYPE STRING,
DISTRIBUTION_PERCENTAGE TYPE STRING,
DISTRIBUTION_QUANTITY TYPE STRING,
DISTRIBUTION_UNIT TYPE STRING,
GL_ACCOUNT TYPE STRING,
GL_ACCOUNT_DESCRIPTION TYPE STRING,
KNTTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMSES_APV_ACC_ASSIGNMENT_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_MMSES_APV_ACC_ASSIGNMENT_STR-PACKNO sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-INTROW sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-ZEKKN sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-KOSTL sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-VBELN sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-VBELP sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-ANLN1 sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-AUFNR sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-PS_PSP_PNR sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-NPLNR sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-KNTTX sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-ANLA_TEXT sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-POSKI sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-POST1 sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-AUFNR_TEXT sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-COST_CENTER_TEXT sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-DISTRIBUTION_PERCENTAGE sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-DISTRIBUTION_QUANTITY sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-DISTRIBUTION_UNIT sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-GL_ACCOUNT sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-GL_ACCOUNT_DESCRIPTION sy-vline 
WA_MMSES_APV_ACC_ASSIGNMENT_STR-KNTTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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