ABAP Select data from SAP table UPOS_PR_WCTST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM UPOS_PR_WCTST
*  INTO TABLE @DATA(IT_UPOS_PR_WCTST2).
*--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_UPOS_PR_WCTST INDEX 1 INTO DATA(WA_UPOS_PR_WCTST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<UPOS_PR_WCTST>-MANDT = 1.
<UPOS_PR_WCTST>-WCTST_NO = 1.
<UPOS_PR_WCTST>-DOC_YEAR = 1.
<UPOS_PR_WCTST>-WL_NO = 1.
<UPOS_PR_WCTST>-WC_NO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_UPOS_PR_WCTST-TEST_DT, sy-vline,
  WA_UPOS_PR_WCTST-STRM_TYPE_CD, sy-vline,
  WA_UPOS_PR_WCTST-TST_TYPE_CD, sy-vline,
  WA_UPOS_PR_WCTST-AL_FL, sy-vline,
  WA_UPOS_PR_WCTST-OC_U, sy-vline,
  WA_UPOS_PR_WCTST-OC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_UPOS_PR_WCTST 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_UPOS_PR_WCTST 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_UPOS_PR_WCTST INTO WA_UPOS_PR_WCTST.


*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 WCTST_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_UPOS_PR_WCTST-WCTST_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_UPOS_PR_WCTST-WCTST_NO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field DOC_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_UPOS_PR_WCTST-DOC_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_UPOS_PR_WCTST-DOC_YEAR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field BASE_DENSITY_U
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_UPOS_PR_WCTST-BASE_DENSITY_U
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_UPOS_PR_WCTST-BASE_DENSITY_U.
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_UPOS_PR_WCTST_STR, 
MANDT TYPE STRING,
WCTST_NO TYPE STRING,
DOC_YEAR TYPE STRING,
WL_NO TYPE STRING,
WC_NO TYPE STRING,
TEST_DT TYPE STRING,
STRM_TYPE_CD TYPE STRING,
TST_TYPE_CD TYPE STRING,
AL_FL TYPE STRING,
OC_U TYPE STRING,
OC TYPE STRING,
WATER_U TYPE STRING,
WATER TYPE STRING,
DUR_HRS TYPE STRING,
DUR_MIN TYPE STRING,
HEAT_VAL_U TYPE STRING,
HEAT_VAL TYPE STRING,
GLG_U TYPE STRING,
GLG TYPE STRING,
GAS_U TYPE STRING,
GAS TYPE STRING,
NET_GAS_U TYPE STRING,
NET_GAS TYPE STRING,
N2_PC TYPE STRING,
CO2_PC TYPE STRING,
CHO_SZ TYPE STRING,
CHO_SZ_U TYPE STRING,
FLO_PS_U TYPE STRING,
FLO_PS TYPE STRING,
TMP_U TYPE STRING,
TMP TYPE STRING,
BASE_DENSITY_U TYPE STRING,
BASE_DENSITY TYPE STRING,
DENTYP TYPE STRING,
OIU_CRUSER TYPE STRING,
OIU_TIMESTAMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_UPOS_PR_WCTST_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_UPOS_PR_WCTST_STR-MANDT sy-vline 
WA_UPOS_PR_WCTST_STR-WCTST_NO sy-vline 
WA_UPOS_PR_WCTST_STR-DOC_YEAR sy-vline 
WA_UPOS_PR_WCTST_STR-WL_NO sy-vline 
WA_UPOS_PR_WCTST_STR-WC_NO sy-vline 
WA_UPOS_PR_WCTST_STR-TEST_DT sy-vline 
WA_UPOS_PR_WCTST_STR-STRM_TYPE_CD sy-vline 
WA_UPOS_PR_WCTST_STR-TST_TYPE_CD sy-vline 
WA_UPOS_PR_WCTST_STR-AL_FL sy-vline 
WA_UPOS_PR_WCTST_STR-OC_U sy-vline 
WA_UPOS_PR_WCTST_STR-OC sy-vline 
WA_UPOS_PR_WCTST_STR-WATER_U sy-vline 
WA_UPOS_PR_WCTST_STR-WATER sy-vline 
WA_UPOS_PR_WCTST_STR-DUR_HRS sy-vline 
WA_UPOS_PR_WCTST_STR-DUR_MIN sy-vline 
WA_UPOS_PR_WCTST_STR-HEAT_VAL_U sy-vline 
WA_UPOS_PR_WCTST_STR-HEAT_VAL sy-vline 
WA_UPOS_PR_WCTST_STR-GLG_U sy-vline 
WA_UPOS_PR_WCTST_STR-GLG sy-vline 
WA_UPOS_PR_WCTST_STR-GAS_U sy-vline 
WA_UPOS_PR_WCTST_STR-GAS sy-vline 
WA_UPOS_PR_WCTST_STR-NET_GAS_U sy-vline 
WA_UPOS_PR_WCTST_STR-NET_GAS sy-vline 
WA_UPOS_PR_WCTST_STR-N2_PC sy-vline 
WA_UPOS_PR_WCTST_STR-CO2_PC sy-vline 
WA_UPOS_PR_WCTST_STR-CHO_SZ sy-vline 
WA_UPOS_PR_WCTST_STR-CHO_SZ_U sy-vline 
WA_UPOS_PR_WCTST_STR-FLO_PS_U sy-vline 
WA_UPOS_PR_WCTST_STR-FLO_PS sy-vline 
WA_UPOS_PR_WCTST_STR-TMP_U sy-vline 
WA_UPOS_PR_WCTST_STR-TMP sy-vline 
WA_UPOS_PR_WCTST_STR-BASE_DENSITY_U sy-vline 
WA_UPOS_PR_WCTST_STR-BASE_DENSITY sy-vline 
WA_UPOS_PR_WCTST_STR-DENTYP sy-vline 
WA_UPOS_PR_WCTST_STR-OIU_CRUSER sy-vline 
WA_UPOS_PR_WCTST_STR-OIU_TIMESTAMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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