ABAP Select data from SAP table PMXP_ISTEM_OLD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PMXP_ISTEM_OLD
*  INTO TABLE @DATA(IT_PMXP_ISTEM_OLD2).
*--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_PMXP_ISTEM_OLD INDEX 1 INTO DATA(WA_PMXP_ISTEM_OLD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PMXP_ISTEM_OLD>-BRANCH_CODE = 1.
<PMXP_ISTEM_OLD>-PAY_AGENT_CODE = 1.
<PMXP_ISTEM_OLD>-ISTE_AC_NO = 1.
<PMXP_ISTEM_OLD>-RFC = 1.
<PMXP_ISTEM_OLD>-BQW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PMXP_ISTEM_OLD-EMP_NAME, sy-vline,
  WA_PMXP_ISTEM_OLD-CHARGE_CODE, sy-vline,
  WA_PMXP_ISTEM_OLD-APPT_TYPE, sy-vline,
  WA_PMXP_ISTEM_OLD-PAY_TYPE, sy-vline,
  WA_PMXP_ISTEM_OLD-FILLER1, sy-vline,
  WA_PMXP_ISTEM_OLD-FROM_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PMXP_ISTEM_OLD 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_PMXP_ISTEM_OLD 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_PMXP_ISTEM_OLD INTO WA_PMXP_ISTEM_OLD.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PMXP_ISTEM_OLD_STR, 
BRANCH_CODE TYPE STRING,
PAY_AGENT_CODE TYPE STRING,
ISTE_AC_NO TYPE STRING,
RFC TYPE STRING,
BQW TYPE STRING,
EMP_NAME TYPE STRING,
CHARGE_CODE TYPE STRING,
APPT_TYPE TYPE STRING,
PAY_TYPE TYPE STRING,
FILLER1 TYPE STRING,
FROM_DATE TYPE STRING,
TO_DATE TYPE STRING,
MEDICAL_SERVICE TYPE STRING,
PENSION_FUND TYPE STRING,
OCC_HAZZARD TYPE STRING,
FOVISSSTE TYPE STRING,
OTHER_CONTRIB TYPE STRING,
PERC_OTHER_CONTRIB TYPE STRING,
EMP_CONTRIB_MEDICAL_SERVICE TYPE STRING,
EMP_PENSION_FUND TYPE STRING,
LOAN_OT TYPE STRING,
FILLER2 TYPE STRING,
LOAN_PCP TYPE STRING,
LOAN_ASM TYPE STRING,
LOAN_TH_C TYPE STRING,
LOAN_TH TYPE STRING,
LOAN_TSH_C TYPE STRING,
LOAN_TSH TYPE STRING,
CURP TYPE STRING,
FILLER3 TYPE STRING,
TOTAL_CONT_DEDN TYPE STRING,
SEMI_PERIOD TYPE STRING,
DATE_PROCESS TYPE STRING,
FED_PAY_ENTITY TYPE STRING,
SOC_SEC_NO TYPE STRING,
QUOT_SAR TYPE STRING,
FILLER4 TYPE STRING,
REG_TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PMXP_ISTEM_OLD_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_PMXP_ISTEM_OLD_STR-BRANCH_CODE sy-vline 
WA_PMXP_ISTEM_OLD_STR-PAY_AGENT_CODE sy-vline 
WA_PMXP_ISTEM_OLD_STR-ISTE_AC_NO sy-vline 
WA_PMXP_ISTEM_OLD_STR-RFC sy-vline 
WA_PMXP_ISTEM_OLD_STR-BQW sy-vline 
WA_PMXP_ISTEM_OLD_STR-EMP_NAME sy-vline 
WA_PMXP_ISTEM_OLD_STR-CHARGE_CODE sy-vline 
WA_PMXP_ISTEM_OLD_STR-APPT_TYPE sy-vline 
WA_PMXP_ISTEM_OLD_STR-PAY_TYPE sy-vline 
WA_PMXP_ISTEM_OLD_STR-FILLER1 sy-vline 
WA_PMXP_ISTEM_OLD_STR-FROM_DATE sy-vline 
WA_PMXP_ISTEM_OLD_STR-TO_DATE sy-vline 
WA_PMXP_ISTEM_OLD_STR-MEDICAL_SERVICE sy-vline 
WA_PMXP_ISTEM_OLD_STR-PENSION_FUND sy-vline 
WA_PMXP_ISTEM_OLD_STR-OCC_HAZZARD sy-vline 
WA_PMXP_ISTEM_OLD_STR-FOVISSSTE sy-vline 
WA_PMXP_ISTEM_OLD_STR-OTHER_CONTRIB sy-vline 
WA_PMXP_ISTEM_OLD_STR-PERC_OTHER_CONTRIB sy-vline 
WA_PMXP_ISTEM_OLD_STR-EMP_CONTRIB_MEDICAL_SERVICE sy-vline 
WA_PMXP_ISTEM_OLD_STR-EMP_PENSION_FUND sy-vline 
WA_PMXP_ISTEM_OLD_STR-LOAN_OT sy-vline 
WA_PMXP_ISTEM_OLD_STR-FILLER2 sy-vline 
WA_PMXP_ISTEM_OLD_STR-LOAN_PCP sy-vline 
WA_PMXP_ISTEM_OLD_STR-LOAN_ASM sy-vline 
WA_PMXP_ISTEM_OLD_STR-LOAN_TH_C sy-vline 
WA_PMXP_ISTEM_OLD_STR-LOAN_TH sy-vline 
WA_PMXP_ISTEM_OLD_STR-LOAN_TSH_C sy-vline 
WA_PMXP_ISTEM_OLD_STR-LOAN_TSH sy-vline 
WA_PMXP_ISTEM_OLD_STR-CURP sy-vline 
WA_PMXP_ISTEM_OLD_STR-FILLER3 sy-vline 
WA_PMXP_ISTEM_OLD_STR-TOTAL_CONT_DEDN sy-vline 
WA_PMXP_ISTEM_OLD_STR-SEMI_PERIOD sy-vline 
WA_PMXP_ISTEM_OLD_STR-DATE_PROCESS sy-vline 
WA_PMXP_ISTEM_OLD_STR-FED_PAY_ENTITY sy-vline 
WA_PMXP_ISTEM_OLD_STR-SOC_SEC_NO sy-vline 
WA_PMXP_ISTEM_OLD_STR-QUOT_SAR sy-vline 
WA_PMXP_ISTEM_OLD_STR-FILLER4 sy-vline 
WA_PMXP_ISTEM_OLD_STR-REG_TYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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