ABAP Select data from SAP table P18_02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P18_02 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 P18_02. 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 P18_02 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_P18_02 TYPE STANDARD TABLE OF P18_02,
      WA_P18_02 TYPE P18_02,
      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: <P18_02> TYPE P18_02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P18_02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P18_02
  INTO TABLE IT_P18_02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P18_02
*  INTO TABLE @DATA(IT_P18_022).
*--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_P18_02 INDEX 1 INTO DATA(WA_P18_022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P18_02 ASSIGNING <P18_02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P18_02>-APZNR = 1.
<P18_02>-BEGDA = 1.
<P18_02>-ENDDA = 1.
<P18_02>-MASSN = 1.
<P18_02>-MASSG = 1.

ENDLOOP.

LOOP AT IT_P18_02 INTO WA_P18_02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P18_02-STAT1, sy-vline,
  WA_P18_02-STAT2, sy-vline,
  WA_P18_02-STAT3, sy-vline,
  WA_P18_02-AKTIVJN, sy-vline,
  WA_P18_02-BUKRS, sy-vline,
  WA_P18_02-WERKS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P18_02 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_P18_02 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_P18_02 INTO WA_P18_02.


*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_P18_02-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P18_02-KOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GRANT_NBR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_P18_02-GRANT_NBR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P18_02-GRANT_NBR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SGMNT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_P18_02-SGMNT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P18_02-SGMNT.
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_P18_02_STR, 
APZNR TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
MASSN TYPE STRING,
MASSG TYPE STRING,
STAT1 TYPE STRING,
STAT2 TYPE STRING,
STAT3 TYPE STRING,
AKTIVJN TYPE STRING,
BUKRS TYPE STRING,
WERKS TYPE STRING,
BTRTL TYPE STRING,
KOSTL TYPE STRING,
PERSG TYPE STRING,
PERSK TYPE STRING,
ABART TYPE STRING,
PLANS TYPE STRING,
GSBER TYPE STRING,
VDSK1 TYPE STRING,
ANSVH TYPE STRING,
ORGEH TYPE STRING,
STELL TYPE STRING,
ZTERF TYPE STRING,
SCHKZ TYPE STRING,
EMPCT TYPE STRING,
KSOLL TYPE STRING,
ASOLL TYPE STRING,
SSOLL TYPE STRING,
KDIVI TYPE STRING,
ADIVI TYPE STRING,
SDIVI TYPE STRING,
DIVGV TYPE STRING,
BSGRD TYPE STRING,
TRFAR TYPE STRING,
TRFGB TYPE STRING,
TRFGR TYPE STRING,
TRFST TYPE STRING,
KOSTVJN TYPE STRING,
DYSCH TYPE STRING,
ARBST TYPE STRING,
WKWDY TYPE STRING,
FISTL TYPE STRING,
GEBER TYPE STRING,
FKBER TYPE STRING,
GRANT_NBR TYPE STRING,
SGMNT TYPE STRING,
BUDGET_PD TYPE STRING,
DRPPV TYPE STRING,
EVIST TYPE STRING,
GESCH TYPE STRING,
PRPOT TYPE STRING,
RESER TYPE STRING,
H_VPP TYPE STRING,
PROCE TYPE STRING,
KALDO TYPE STRING,
KALDF TYPE STRING,
PREPD TYPE STRING,
ABKRS TYPE STRING,
SACHA TYPE STRING,
SACHP TYPE STRING,
SACHZ TYPE STRING,
JUPER TYPE STRING,
MSTBR TYPE STRING,
SBMOD TYPE STRING,
KOKRS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P18_02_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_P18_02_STR-APZNR sy-vline 
WA_P18_02_STR-BEGDA sy-vline 
WA_P18_02_STR-ENDDA sy-vline 
WA_P18_02_STR-MASSN sy-vline 
WA_P18_02_STR-MASSG sy-vline 
WA_P18_02_STR-STAT1 sy-vline 
WA_P18_02_STR-STAT2 sy-vline 
WA_P18_02_STR-STAT3 sy-vline 
WA_P18_02_STR-AKTIVJN sy-vline 
WA_P18_02_STR-BUKRS sy-vline 
WA_P18_02_STR-WERKS sy-vline 
WA_P18_02_STR-BTRTL sy-vline 
WA_P18_02_STR-KOSTL sy-vline 
WA_P18_02_STR-PERSG sy-vline 
WA_P18_02_STR-PERSK sy-vline 
WA_P18_02_STR-ABART sy-vline 
WA_P18_02_STR-PLANS sy-vline 
WA_P18_02_STR-GSBER sy-vline 
WA_P18_02_STR-VDSK1 sy-vline 
WA_P18_02_STR-ANSVH sy-vline 
WA_P18_02_STR-ORGEH sy-vline 
WA_P18_02_STR-STELL sy-vline 
WA_P18_02_STR-ZTERF sy-vline 
WA_P18_02_STR-SCHKZ sy-vline 
WA_P18_02_STR-EMPCT sy-vline 
WA_P18_02_STR-KSOLL sy-vline 
WA_P18_02_STR-ASOLL sy-vline 
WA_P18_02_STR-SSOLL sy-vline 
WA_P18_02_STR-KDIVI sy-vline 
WA_P18_02_STR-ADIVI sy-vline 
WA_P18_02_STR-SDIVI sy-vline 
WA_P18_02_STR-DIVGV sy-vline 
WA_P18_02_STR-BSGRD sy-vline 
WA_P18_02_STR-TRFAR sy-vline 
WA_P18_02_STR-TRFGB sy-vline 
WA_P18_02_STR-TRFGR sy-vline 
WA_P18_02_STR-TRFST sy-vline 
WA_P18_02_STR-KOSTVJN sy-vline 
WA_P18_02_STR-DYSCH sy-vline 
WA_P18_02_STR-ARBST sy-vline 
WA_P18_02_STR-WKWDY sy-vline 
WA_P18_02_STR-FISTL sy-vline 
WA_P18_02_STR-GEBER sy-vline 
WA_P18_02_STR-FKBER sy-vline 
WA_P18_02_STR-GRANT_NBR sy-vline 
WA_P18_02_STR-SGMNT sy-vline 
WA_P18_02_STR-BUDGET_PD sy-vline 
WA_P18_02_STR-DRPPV sy-vline 
WA_P18_02_STR-EVIST sy-vline 
WA_P18_02_STR-GESCH sy-vline 
WA_P18_02_STR-PRPOT sy-vline 
WA_P18_02_STR-RESER sy-vline 
WA_P18_02_STR-H_VPP sy-vline 
WA_P18_02_STR-PROCE sy-vline 
WA_P18_02_STR-KALDO sy-vline 
WA_P18_02_STR-KALDF sy-vline 
WA_P18_02_STR-PREPD sy-vline 
WA_P18_02_STR-ABKRS sy-vline 
WA_P18_02_STR-SACHA sy-vline 
WA_P18_02_STR-SACHP sy-vline 
WA_P18_02_STR-SACHZ sy-vline 
WA_P18_02_STR-JUPER sy-vline 
WA_P18_02_STR-MSTBR sy-vline 
WA_P18_02_STR-SBMOD sy-vline 
WA_P18_02_STR-KOKRS sy-vline      INTO ld_text SEPARATED BY SPACE.

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