ABAP Select data from SAP table /PLMB/S_MAT_PREVIEW into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /PLMB/S_MAT_PREVIEW 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 /PLMB/S_MAT_PREVIEW. 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 /PLMB/S_MAT_PREVIEW 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_/PLMB/S_MAT_PREVIEW TYPE STANDARD TABLE OF /PLMB/S_MAT_PREVIEW,
      WA_/PLMB/S_MAT_PREVIEW TYPE /PLMB/S_MAT_PREVIEW,
      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: </PLMB/S_MAT_PREVIEW> TYPE /PLMB/S_MAT_PREVIEW.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /PLMB/S_MAT_PREVIEW
  INTO TABLE IT_/PLMB/S_MAT_PREVIEW.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /PLMB/S_MAT_PREVIEW
*  INTO TABLE @DATA(IT_/PLMB/S_MAT_PREVIEW2).
*--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_/PLMB/S_MAT_PREVIEW INDEX 1 INTO DATA(WA_/PLMB/S_MAT_PREVIEW2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/PLMB/S_MAT_PREVIEW ASSIGNING </PLMB/S_MAT_PREVIEW>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</PLMB/S_MAT_PREVIEW>-MEINS = 1.
</PLMB/S_MAT_PREVIEW>-MAT_TXT = 1.
</PLMB/S_MAT_PREVIEW>-MAKTX_SPRAS = 1.
</PLMB/S_MAT_PREVIEW>-BISMT = 1.
</PLMB/S_MAT_PREVIEW>-EXTWG = 1.

ENDLOOP.

LOOP AT IT_/PLMB/S_MAT_PREVIEW INTO WA_/PLMB/S_MAT_PREVIEW.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/PLMB/S_MAT_PREVIEW-SPART, sy-vline,
  WA_/PLMB/S_MAT_PREVIEW-PRODH_D, sy-vline,
  WA_/PLMB/S_MAT_PREVIEW-LABOR, sy-vline,
  WA_/PLMB/S_MAT_PREVIEW-NORMT, sy-vline,
  WA_/PLMB/S_MAT_PREVIEW-CADKZ, sy-vline,
  WA_/PLMB/S_MAT_PREVIEW-WRKST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/PLMB/S_MAT_PREVIEW 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_/PLMB/S_MAT_PREVIEW 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_/PLMB/S_MAT_PREVIEW INTO WA_/PLMB/S_MAT_PREVIEW.


*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 MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/PLMB/S_MAT_PREVIEW-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/PLMB/S_MAT_PREVIEW-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field MAKTX_SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/PLMB/S_MAT_PREVIEW-MAKTX_SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/PLMB/S_MAT_PREVIEW-MAKTX_SPRAS.
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_/PLMB/S_MAT_PREVIEW_STR, 
MEINS TYPE STRING,
MAT_TXT TYPE STRING,
MAKTX_SPRAS TYPE STRING,
BISMT TYPE STRING,
EXTWG TYPE STRING,
SPART TYPE STRING,
PRODH_D TYPE STRING,
LABOR TYPE STRING,
NORMT TYPE STRING,
CADKZ TYPE STRING,
WRKST TYPE STRING,
MATKL TYPE STRING,
KZKFG TYPE STRING,
MFRPN TYPE STRING,
MSTAE TYPE STRING,
MSTDE TYPE STRING,
MSTAV TYPE STRING,
MSTDV TYPE STRING,
ERSDA TYPE STRING,
ERNAM TYPE STRING,
LAEDA TYPE STRING,
AENAM TYPE STRING,
MAT_GRP_TEXT TYPE STRING,
BASE_UOM_TEXT TYPE STRING,
EXT_MAT_GRP_TEXT TYPE STRING,
DIVISION_TEXT TYPE STRING,
LAB_TEXT TYPE STRING,
PROD_HIER_TEXT TYPE STRING,
PUR_STATUS_TEXT TYPE STRING,
SAL_STATUS_TEXT TYPE STRING,
BEGRU TYPE STRING,
ERNAM_TEXT TYPE STRING,
AENAM_TEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/PLMB/S_MAT_PREVIEW_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_/PLMB/S_MAT_PREVIEW_STR-MEINS sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MAT_TXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MAKTX_SPRAS sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-BISMT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-EXTWG sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-SPART sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-PRODH_D sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-LABOR sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-NORMT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-CADKZ sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-WRKST sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MATKL sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-KZKFG sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MFRPN sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MSTAE sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MSTDE sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MSTAV sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MSTDV sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-ERSDA sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-ERNAM sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-LAEDA sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-AENAM sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-MAT_GRP_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-BASE_UOM_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-EXT_MAT_GRP_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-DIVISION_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-LAB_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-PROD_HIER_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-PUR_STATUS_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-SAL_STATUS_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-BEGRU sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-ERNAM_TEXT sy-vline 
WA_/PLMB/S_MAT_PREVIEW_STR-AENAM_TEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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