ABAP Select data from SAP table /PM0/ALWACHGSING into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /PM0/ALWACHGSING 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 /PM0/ALWACHGSING. 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 /PM0/ALWACHGSING 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_/PM0/ALWACHGSING TYPE STANDARD TABLE OF /PM0/ALWACHGSING,
      WA_/PM0/ALWACHGSING TYPE /PM0/ALWACHGSING,
      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: </PM0/ALWACHGSING> TYPE /PM0/ALWACHGSING.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/PM0/ALWACHGSING.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /PM0/ALWACHGSING
  INTO TABLE IT_/PM0/ALWACHGSING.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /PM0/ALWACHGSING
*  INTO TABLE @DATA(IT_/PM0/ALWACHGSING2).
*--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_/PM0/ALWACHGSING INDEX 1 INTO DATA(WA_/PM0/ALWACHGSING2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/PM0/ALWACHGSING ASSIGNING </PM0/ALWACHGSING>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</PM0/ALWACHGSING>-POSTING_AM = 1.
</PM0/ALWACHGSING>-MODTP_CD = 1.
</PM0/ALWACHGSING>-ACCTP_CD = 1.
</PM0/ALWACHGSING>-POSTING_CD = 1.
</PM0/ALWACHGSING>-VALIDFROM_DT = 1.

ENDLOOP.

LOOP AT IT_/PM0/ALWACHGSING INTO WA_/PM0/ALWACHGSING.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/PM0/ALWACHGSING-VALIDTO_DT, sy-vline,
  WA_/PM0/ALWACHGSING-VALUEDET_DT, sy-vline,
  WA_/PM0/ALWACHGSING-PM_ID, sy-vline,
  WA_/PM0/ALWACHGSING-CURRENCY_ID, sy-vline,
  WA_/PM0/ALWACHGSING-VALID_DT, sy-vline,
  WA_/PM0/ALWACHGSING-CHGTP_CD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/PM0/ALWACHGSING 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_/PM0/ALWACHGSING 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_/PM0/ALWACHGSING INTO WA_/PM0/ALWACHGSING.


*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 CANCELDOCNR_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/PM0/ALWACHGSING-CANCELDOCNR_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/PM0/ALWACHGSING-CANCELDOCNR_ID.
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_/PM0/ALWACHGSING_STR, 
POSTING_AM TYPE STRING,
MODTP_CD TYPE STRING,
ACCTP_CD TYPE STRING,
POSTING_CD TYPE STRING,
VALIDFROM_DT TYPE STRING,
VALIDTO_DT TYPE STRING,
VALUEDET_DT TYPE STRING,
PM_ID TYPE STRING,
CURRENCY_ID TYPE STRING,
VALID_DT TYPE STRING,
CHGTP_CD TYPE STRING,
/PM0/ALDACHGSING_CID TYPE STRING,
CANCELDOCNR_ID TYPE STRING,
PBSTYP_TT TYPE STRING,
REFCOVCP_ID TYPE STRING,
REFCOVERAGE_ID TYPE STRING,
REFCOVPAC_ID TYPE STRING,
REFPOLICYPRODUCT_ID TYPE STRING,
BO_ID TYPE STRING,
POLICY_ID TYPE STRING,
PPDPAC_ID TYPE STRING,
POLICYPRODUCT_ID TYPE STRING,
COVPAC_ID TYPE STRING,
COVERAGE_ID TYPE STRING,
COVCP_ID TYPE STRING,
CHGSING_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/PM0/ALWACHGSING_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_/PM0/ALWACHGSING_STR-POSTING_AM sy-vline 
WA_/PM0/ALWACHGSING_STR-MODTP_CD sy-vline 
WA_/PM0/ALWACHGSING_STR-ACCTP_CD sy-vline 
WA_/PM0/ALWACHGSING_STR-POSTING_CD sy-vline 
WA_/PM0/ALWACHGSING_STR-VALIDFROM_DT sy-vline 
WA_/PM0/ALWACHGSING_STR-VALIDTO_DT sy-vline 
WA_/PM0/ALWACHGSING_STR-VALUEDET_DT sy-vline 
WA_/PM0/ALWACHGSING_STR-PM_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-CURRENCY_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-VALID_DT sy-vline 
WA_/PM0/ALWACHGSING_STR-CHGTP_CD sy-vline 
WA_/PM0/ALWACHGSING_STR-/PM0/ALDACHGSING_CID sy-vline 
WA_/PM0/ALWACHGSING_STR-CANCELDOCNR_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-PBSTYP_TT sy-vline 
WA_/PM0/ALWACHGSING_STR-REFCOVCP_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-REFCOVERAGE_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-REFCOVPAC_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-REFPOLICYPRODUCT_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-BO_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-POLICY_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-PPDPAC_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-POLICYPRODUCT_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-COVPAC_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-COVERAGE_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-COVCP_ID sy-vline 
WA_/PM0/ALWACHGSING_STR-CHGSING_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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