ABAP Select data from SAP table VAKE_PERIOD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VAKE_PERIOD
*  INTO TABLE @DATA(IT_VAKE_PERIOD2).
*--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_VAKE_PERIOD INDEX 1 INTO DATA(WA_VAKE_PERIOD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VAKE_PERIOD>-KNUMH = 1.
<VAKE_PERIOD>-VAKE = 1.
<VAKE_PERIOD>-KVEWE = 1.
<VAKE_PERIOD>-KOTABNR = 1.
<VAKE_PERIOD>-KAPPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VAKE_PERIOD-KSCHL, sy-vline,
  WA_VAKE_PERIOD-VAKEY, sy-vline,
  WA_VAKE_PERIOD-DATBI, sy-vline,
  WA_VAKE_PERIOD-DATAB, sy-vline,
  WA_VAKE_PERIOD-KNUMH, sy-vline,
  WA_VAKE_PERIOD-KNUMA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VAKE_PERIOD 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_VAKE_PERIOD 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_VAKE_PERIOD INTO WA_VAKE_PERIOD.


*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 KOTAB, internal->external for field KOTABNR
CALL FUNCTION 'CONVERSION_EXIT_KOTAB_OUTPUT'
  EXPORTING
    input =                      WA_VAKE_PERIOD-KOTABNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKE_PERIOD-KOTABNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field KONMS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VAKE_PERIOD-KONMS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKE_PERIOD-KONMS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field KMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VAKE_PERIOD-KMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKE_PERIOD-KMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_VAKE_PERIOD-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKE_PERIOD-MEINS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit MATN1, internal->external for field BOMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_VAKE_PERIOD-BOMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKE_PERIOD-BOMAT.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field VERTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VAKE_PERIOD-VERTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VAKE_PERIOD-VERTN.
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_VAKE_PERIOD_STR, 
KNUMH TYPE STRING,
VAKE TYPE STRING,
KVEWE TYPE STRING,
KOTABNR TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
VAKEY TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
KNUMH TYPE STRING,
KNUMA TYPE STRING,
VADAT TYPE STRING,
KONP TYPE STRING,
MANDT TYPE STRING,
KNUMH TYPE STRING,
KOPOS TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
KNUMT TYPE STRING,
STFKZ TYPE STRING,
KZBZG TYPE STRING,
KSTBM TYPE STRING,
KONMS TYPE STRING,
KSTBW TYPE STRING,
KONWS TYPE STRING,
KRECH TYPE STRING,
KBETR TYPE STRING,
KONWA TYPE STRING,
KPEIN TYPE STRING,
KMEIN TYPE STRING,
PRSCH TYPE STRING,
KUMZA TYPE STRING,
KUMNE TYPE STRING,
MEINS TYPE STRING,
MXWRT TYPE STRING,
GKWRT TYPE STRING,
PKWRT TYPE STRING,
FKWRT TYPE STRING,
RSWRT TYPE STRING,
KWAEH TYPE STRING,
UKBAS TYPE STRING,
KZNEP TYPE STRING,
KUNNR TYPE STRING,
LIFNR TYPE STRING,
MWSK1 TYPE STRING,
LOEVM_KO TYPE STRING,
ZAEHK_IND TYPE STRING,
BOMAT TYPE STRING,
KBRUE TYPE STRING,
KSPAE TYPE STRING,
BOSTA TYPE STRING,
KNUMA_PI TYPE STRING,
KNUMA_AG TYPE STRING,
KNUMA_SQ TYPE STRING,
VALTG TYPE STRING,
VALDT TYPE STRING,
ZTERM TYPE STRING,
ANZAUF TYPE STRING,
MIKBAS TYPE STRING,
MXKBAS TYPE STRING,
KOMXWRT TYPE STRING,
KLF_STG TYPE STRING,
KLF_KAL TYPE STRING,
VKKAL TYPE STRING,
AKTNR TYPE STRING,
KNUMA_BO TYPE STRING,
MWSK2 TYPE STRING,
VERTT TYPE STRING,
VERTN TYPE STRING,
VBEWA TYPE STRING,
MDFLG TYPE STRING,
KFRST TYPE STRING,
UASTA TYPE STRING,
CNDN_CHGREASON TYPE STRING,
KNUMH_RAN TYPE STRING,
T685 TYPE STRING,
MANDT TYPE STRING,
KVEWE TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
KOZGF TYPE STRING,
DATVO TYPE STRING,
DTVOB TYPE STRING,
OBSOLETE TYPE STRING,
J_3GPRAEND TYPE STRING,
J_3GBUARTL TYPE STRING,
J_3GBUARTB TYPE STRING,
T682I TYPE STRING,
T682Z TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VAKE_PERIOD_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_VAKE_PERIOD_STR-KNUMH sy-vline 
WA_VAKE_PERIOD_STR-VAKE sy-vline 
WA_VAKE_PERIOD_STR-KVEWE sy-vline 
WA_VAKE_PERIOD_STR-KOTABNR sy-vline 
WA_VAKE_PERIOD_STR-KAPPL sy-vline 
WA_VAKE_PERIOD_STR-KSCHL sy-vline 
WA_VAKE_PERIOD_STR-VAKEY sy-vline 
WA_VAKE_PERIOD_STR-DATBI sy-vline 
WA_VAKE_PERIOD_STR-DATAB sy-vline 
WA_VAKE_PERIOD_STR-KNUMH sy-vline 
WA_VAKE_PERIOD_STR-KNUMA sy-vline 
WA_VAKE_PERIOD_STR-VADAT sy-vline 
WA_VAKE_PERIOD_STR-KONP sy-vline 
WA_VAKE_PERIOD_STR-MANDT sy-vline 
WA_VAKE_PERIOD_STR-KNUMH sy-vline 
WA_VAKE_PERIOD_STR-KOPOS sy-vline 
WA_VAKE_PERIOD_STR-KAPPL sy-vline 
WA_VAKE_PERIOD_STR-KSCHL sy-vline 
WA_VAKE_PERIOD_STR-KNUMT sy-vline 
WA_VAKE_PERIOD_STR-STFKZ sy-vline 
WA_VAKE_PERIOD_STR-KZBZG sy-vline 
WA_VAKE_PERIOD_STR-KSTBM sy-vline 
WA_VAKE_PERIOD_STR-KONMS sy-vline 
WA_VAKE_PERIOD_STR-KSTBW sy-vline 
WA_VAKE_PERIOD_STR-KONWS sy-vline 
WA_VAKE_PERIOD_STR-KRECH sy-vline 
WA_VAKE_PERIOD_STR-KBETR sy-vline 
WA_VAKE_PERIOD_STR-KONWA sy-vline 
WA_VAKE_PERIOD_STR-KPEIN sy-vline 
WA_VAKE_PERIOD_STR-KMEIN sy-vline 
WA_VAKE_PERIOD_STR-PRSCH sy-vline 
WA_VAKE_PERIOD_STR-KUMZA sy-vline 
WA_VAKE_PERIOD_STR-KUMNE sy-vline 
WA_VAKE_PERIOD_STR-MEINS sy-vline 
WA_VAKE_PERIOD_STR-MXWRT sy-vline 
WA_VAKE_PERIOD_STR-GKWRT sy-vline 
WA_VAKE_PERIOD_STR-PKWRT sy-vline 
WA_VAKE_PERIOD_STR-FKWRT sy-vline 
WA_VAKE_PERIOD_STR-RSWRT sy-vline 
WA_VAKE_PERIOD_STR-KWAEH sy-vline 
WA_VAKE_PERIOD_STR-UKBAS sy-vline 
WA_VAKE_PERIOD_STR-KZNEP sy-vline 
WA_VAKE_PERIOD_STR-KUNNR sy-vline 
WA_VAKE_PERIOD_STR-LIFNR sy-vline 
WA_VAKE_PERIOD_STR-MWSK1 sy-vline 
WA_VAKE_PERIOD_STR-LOEVM_KO sy-vline 
WA_VAKE_PERIOD_STR-ZAEHK_IND sy-vline 
WA_VAKE_PERIOD_STR-BOMAT sy-vline 
WA_VAKE_PERIOD_STR-KBRUE sy-vline 
WA_VAKE_PERIOD_STR-KSPAE sy-vline 
WA_VAKE_PERIOD_STR-BOSTA sy-vline 
WA_VAKE_PERIOD_STR-KNUMA_PI sy-vline 
WA_VAKE_PERIOD_STR-KNUMA_AG sy-vline 
WA_VAKE_PERIOD_STR-KNUMA_SQ sy-vline 
WA_VAKE_PERIOD_STR-VALTG sy-vline 
WA_VAKE_PERIOD_STR-VALDT sy-vline 
WA_VAKE_PERIOD_STR-ZTERM sy-vline 
WA_VAKE_PERIOD_STR-ANZAUF sy-vline 
WA_VAKE_PERIOD_STR-MIKBAS sy-vline 
WA_VAKE_PERIOD_STR-MXKBAS sy-vline 
WA_VAKE_PERIOD_STR-KOMXWRT sy-vline 
WA_VAKE_PERIOD_STR-KLF_STG sy-vline 
WA_VAKE_PERIOD_STR-KLF_KAL sy-vline 
WA_VAKE_PERIOD_STR-VKKAL sy-vline 
WA_VAKE_PERIOD_STR-AKTNR sy-vline 
WA_VAKE_PERIOD_STR-KNUMA_BO sy-vline 
WA_VAKE_PERIOD_STR-MWSK2 sy-vline 
WA_VAKE_PERIOD_STR-VERTT sy-vline 
WA_VAKE_PERIOD_STR-VERTN sy-vline 
WA_VAKE_PERIOD_STR-VBEWA sy-vline 
WA_VAKE_PERIOD_STR-MDFLG sy-vline 
WA_VAKE_PERIOD_STR-KFRST sy-vline 
WA_VAKE_PERIOD_STR-UASTA sy-vline 
WA_VAKE_PERIOD_STR-CNDN_CHGREASON sy-vline 
WA_VAKE_PERIOD_STR-KNUMH_RAN sy-vline 
WA_VAKE_PERIOD_STR-T685 sy-vline 
WA_VAKE_PERIOD_STR-MANDT sy-vline 
WA_VAKE_PERIOD_STR-KVEWE sy-vline 
WA_VAKE_PERIOD_STR-KAPPL sy-vline 
WA_VAKE_PERIOD_STR-KSCHL sy-vline 
WA_VAKE_PERIOD_STR-KOZGF sy-vline 
WA_VAKE_PERIOD_STR-DATVO sy-vline 
WA_VAKE_PERIOD_STR-DTVOB sy-vline 
WA_VAKE_PERIOD_STR-OBSOLETE sy-vline 
WA_VAKE_PERIOD_STR-J_3GPRAEND sy-vline 
WA_VAKE_PERIOD_STR-J_3GBUARTL sy-vline 
WA_VAKE_PERIOD_STR-J_3GBUARTB sy-vline 
WA_VAKE_PERIOD_STR-T682I sy-vline 
WA_VAKE_PERIOD_STR-T682Z sy-vline      INTO ld_text SEPARATED BY SPACE.

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