ABAP Select data from SAP table TXW_PTRV_PERIO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXW_PTRV_PERIO
*  INTO TABLE @DATA(IT_TXW_PTRV_PERIO2).
*--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_TXW_PTRV_PERIO INDEX 1 INTO DATA(WA_TXW_PTRV_PERIO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXW_PTRV_PERIO>-MANDT = 1.
<TXW_PTRV_PERIO>-PERNR = 1.
<TXW_PTRV_PERIO>-REINR = 1.
<TXW_PTRV_PERIO>-PERIO = 1.
<TXW_PTRV_PERIO>-PDVRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXW_PTRV_PERIO-HDVRS, sy-vline,
  WA_TXW_PTRV_PERIO-PDATV, sy-vline,
  WA_TXW_PTRV_PERIO-PUHRV, sy-vline,
  WA_TXW_PTRV_PERIO-PDATB, sy-vline,
  WA_TXW_PTRV_PERIO-PUHRB, sy-vline,
  WA_TXW_PTRV_PERIO-DRUCK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TXW_PTRV_PERIO 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_TXW_PTRV_PERIO 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_TXW_PTRV_PERIO INTO WA_TXW_PTRV_PERIO.


*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_TXW_PTRV_PERIO_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
REINR TYPE STRING,
PERIO TYPE STRING,
PDVRS TYPE STRING,
HDVRS TYPE STRING,
PDATV TYPE STRING,
PUHRV TYPE STRING,
PDATB TYPE STRING,
PUHRB TYPE STRING,
DRUCK TYPE STRING,
ANTRG TYPE STRING,
ABREC TYPE STRING,
UEBLG TYPE STRING,
UEBRF TYPE STRING,
UEBDT TYPE STRING,
TLOCK TYPE STRING,
WAERS TYPE STRING,
ABRJ1 TYPE STRING,
ABRP1 TYPE STRING,
PERM1 TYPE STRING,
ABKR1 TYPE STRING,
BEGP1 TYPE STRING,
ENDP1 TYPE STRING,
ABRJ2 TYPE STRING,
ABRP2 TYPE STRING,
PERM2 TYPE STRING,
ABKR2 TYPE STRING,
BEGP2 TYPE STRING,
ENDP2 TYPE STRING,
ACCDT TYPE STRING,
ACCTM TYPE STRING,
RUNID TYPE STRING,
VERPA TYPE STRING,
UEBKZ TYPE STRING,
ANUEP TYPE STRING,
NO_MILES TYPE STRING,
LSTAY TYPE STRING,
TR_DOPP_ANZAHL TYPE STRING,
TR_EINF_ANZAHL TYPE STRING,
TR_ENTFERNUNG TYPE STRING,
VU_EA_DOPP_ANZ TYPE STRING,
VU_EA_EINF_ANZ TYPE STRING,
VU_EA_ENTFERN TYPE STRING,
VU_EA_KM_SATZ TYPE STRING,
NU_EA_DOPP_ANZ TYPE STRING,
NU_EA_EINF_ANZ TYPE STRING,
NU_EA_ENTFERN TYPE STRING,
NU_EA_KM_SATZ TYPE STRING,
V_UNENTGELTLICH TYPE STRING,
U_UNENTGELTLICH TYPE STRING,
REDUC_ERGRU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXW_PTRV_PERIO_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_TXW_PTRV_PERIO_STR-MANDT sy-vline 
WA_TXW_PTRV_PERIO_STR-PERNR sy-vline 
WA_TXW_PTRV_PERIO_STR-REINR sy-vline 
WA_TXW_PTRV_PERIO_STR-PERIO sy-vline 
WA_TXW_PTRV_PERIO_STR-PDVRS sy-vline 
WA_TXW_PTRV_PERIO_STR-HDVRS sy-vline 
WA_TXW_PTRV_PERIO_STR-PDATV sy-vline 
WA_TXW_PTRV_PERIO_STR-PUHRV sy-vline 
WA_TXW_PTRV_PERIO_STR-PDATB sy-vline 
WA_TXW_PTRV_PERIO_STR-PUHRB sy-vline 
WA_TXW_PTRV_PERIO_STR-DRUCK sy-vline 
WA_TXW_PTRV_PERIO_STR-ANTRG sy-vline 
WA_TXW_PTRV_PERIO_STR-ABREC sy-vline 
WA_TXW_PTRV_PERIO_STR-UEBLG sy-vline 
WA_TXW_PTRV_PERIO_STR-UEBRF sy-vline 
WA_TXW_PTRV_PERIO_STR-UEBDT sy-vline 
WA_TXW_PTRV_PERIO_STR-TLOCK sy-vline 
WA_TXW_PTRV_PERIO_STR-WAERS sy-vline 
WA_TXW_PTRV_PERIO_STR-ABRJ1 sy-vline 
WA_TXW_PTRV_PERIO_STR-ABRP1 sy-vline 
WA_TXW_PTRV_PERIO_STR-PERM1 sy-vline 
WA_TXW_PTRV_PERIO_STR-ABKR1 sy-vline 
WA_TXW_PTRV_PERIO_STR-BEGP1 sy-vline 
WA_TXW_PTRV_PERIO_STR-ENDP1 sy-vline 
WA_TXW_PTRV_PERIO_STR-ABRJ2 sy-vline 
WA_TXW_PTRV_PERIO_STR-ABRP2 sy-vline 
WA_TXW_PTRV_PERIO_STR-PERM2 sy-vline 
WA_TXW_PTRV_PERIO_STR-ABKR2 sy-vline 
WA_TXW_PTRV_PERIO_STR-BEGP2 sy-vline 
WA_TXW_PTRV_PERIO_STR-ENDP2 sy-vline 
WA_TXW_PTRV_PERIO_STR-ACCDT sy-vline 
WA_TXW_PTRV_PERIO_STR-ACCTM sy-vline 
WA_TXW_PTRV_PERIO_STR-RUNID sy-vline 
WA_TXW_PTRV_PERIO_STR-VERPA sy-vline 
WA_TXW_PTRV_PERIO_STR-UEBKZ sy-vline 
WA_TXW_PTRV_PERIO_STR-ANUEP sy-vline 
WA_TXW_PTRV_PERIO_STR-NO_MILES sy-vline 
WA_TXW_PTRV_PERIO_STR-LSTAY sy-vline 
WA_TXW_PTRV_PERIO_STR-TR_DOPP_ANZAHL sy-vline 
WA_TXW_PTRV_PERIO_STR-TR_EINF_ANZAHL sy-vline 
WA_TXW_PTRV_PERIO_STR-TR_ENTFERNUNG sy-vline 
WA_TXW_PTRV_PERIO_STR-VU_EA_DOPP_ANZ sy-vline 
WA_TXW_PTRV_PERIO_STR-VU_EA_EINF_ANZ sy-vline 
WA_TXW_PTRV_PERIO_STR-VU_EA_ENTFERN sy-vline 
WA_TXW_PTRV_PERIO_STR-VU_EA_KM_SATZ sy-vline 
WA_TXW_PTRV_PERIO_STR-NU_EA_DOPP_ANZ sy-vline 
WA_TXW_PTRV_PERIO_STR-NU_EA_EINF_ANZ sy-vline 
WA_TXW_PTRV_PERIO_STR-NU_EA_ENTFERN sy-vline 
WA_TXW_PTRV_PERIO_STR-NU_EA_KM_SATZ sy-vline 
WA_TXW_PTRV_PERIO_STR-V_UNENTGELTLICH sy-vline 
WA_TXW_PTRV_PERIO_STR-U_UNENTGELTLICH sy-vline 
WA_TXW_PTRV_PERIO_STR-REDUC_ERGRU sy-vline      INTO ld_text SEPARATED BY SPACE.

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