ABAP Select data from SAP table ASVTPURCHASING into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ASVTPURCHASING
*  INTO TABLE @DATA(IT_ASVTPURCHASING2).
*--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_ASVTPURCHASING INDEX 1 INTO DATA(WA_ASVTPURCHASING2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ASVTPURCHASING>-MANDT = 1.
<ASVTPURCHASING>-COMPLIANCEREQUIREMENT = 1.
<ASVTPURCHASING>-SUBSTANCELIST = 1.
<ASVTPURCHASING>-TRACKINGPERIODSTARTDATE = 1.
<ASVTPURCHASING>-TRACKINGPERIODENDDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ASVTPURCHASING-CHMLCMPLNCINFOSPECIFICATION, sy-vline,
  WA_ASVTPURCHASING-SPECIFICATION, sy-vline,
  WA_ASVTPURCHASING-LEGALENTITY, sy-vline,
  WA_ASVTPURCHASING-PLANT, sy-vline,
  WA_ASVTPURCHASING-MATERIAL, sy-vline,
  WA_ASVTPURCHASING-CMPLRQSVTSCENARIO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ASVTPURCHASING 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_ASVTPURCHASING 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_ASVTPURCHASING INTO WA_ASVTPURCHASING.


*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 MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ASVTPURCHASING-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ASVTPURCHASING-MATERIAL.
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_ASVTPURCHASING_STR, 
MANDT TYPE STRING,
COMPLIANCEREQUIREMENT TYPE STRING,
SUBSTANCELIST TYPE STRING,
TRACKINGPERIODSTARTDATE TYPE STRING,
TRACKINGPERIODENDDATE TYPE STRING,
CHMLCMPLNCINFOSPECIFICATION TYPE STRING,
SPECIFICATION TYPE STRING,
LEGALENTITY TYPE STRING,
PLANT TYPE STRING,
MATERIAL TYPE STRING,
CMPLRQSVTSCENARIO TYPE STRING,
POSTINGDATE TYPE STRING,
COUNTRY TYPE STRING,
CONFDTOTTODTESUBSTVOL TYPE STRING,
CONFIRMEDDAILYSUBSTANCEVOLUME TYPE STRING,
CONFIRMEDSUBSTANCEVOLUMEUNIT TYPE STRING,
SVTSUBSTANCECONCENTRATIONQTY TYPE STRING,
SVTSUBSTCONCENTRATIONQTYUNIT TYPE STRING,
SVTISPERIODLASTRECORD TYPE STRING,
SVTISCURRENTTRACKINGPERIOD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ASVTPURCHASING_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_ASVTPURCHASING_STR-MANDT sy-vline 
WA_ASVTPURCHASING_STR-COMPLIANCEREQUIREMENT sy-vline 
WA_ASVTPURCHASING_STR-SUBSTANCELIST sy-vline 
WA_ASVTPURCHASING_STR-TRACKINGPERIODSTARTDATE sy-vline 
WA_ASVTPURCHASING_STR-TRACKINGPERIODENDDATE sy-vline 
WA_ASVTPURCHASING_STR-CHMLCMPLNCINFOSPECIFICATION sy-vline 
WA_ASVTPURCHASING_STR-SPECIFICATION sy-vline 
WA_ASVTPURCHASING_STR-LEGALENTITY sy-vline 
WA_ASVTPURCHASING_STR-PLANT sy-vline 
WA_ASVTPURCHASING_STR-MATERIAL sy-vline 
WA_ASVTPURCHASING_STR-CMPLRQSVTSCENARIO sy-vline 
WA_ASVTPURCHASING_STR-POSTINGDATE sy-vline 
WA_ASVTPURCHASING_STR-COUNTRY sy-vline 
WA_ASVTPURCHASING_STR-CONFDTOTTODTESUBSTVOL sy-vline 
WA_ASVTPURCHASING_STR-CONFIRMEDDAILYSUBSTANCEVOLUME sy-vline 
WA_ASVTPURCHASING_STR-CONFIRMEDSUBSTANCEVOLUMEUNIT sy-vline 
WA_ASVTPURCHASING_STR-SVTSUBSTANCECONCENTRATIONQTY sy-vline 
WA_ASVTPURCHASING_STR-SVTSUBSTCONCENTRATIONQTYUNIT sy-vline 
WA_ASVTPURCHASING_STR-SVTISPERIODLASTRECORD sy-vline 
WA_ASVTPURCHASING_STR-SVTISCURRENTTRACKINGPERIOD sy-vline      INTO ld_text SEPARATED BY SPACE.

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