ABAP Select data from SAP table MEWIEINEX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEWIEINEX
*  INTO TABLE @DATA(IT_MEWIEINEX2).
*--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_MEWIEINEX INDEX 1 INTO DATA(WA_MEWIEINEX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEWIEINEX>-INFO_REC = 1.
<MEWIEINEX>-PURCH_ORG = 1.
<MEWIEINEX>-INFO_TYPE = 1.
<MEWIEINEX>-PLANT = 1.
<MEWIEINEX>-DELETE_IND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEWIEINEX-CREATED_AT, sy-vline,
  WA_MEWIEINEX-CREATED_BY, sy-vline,
  WA_MEWIEINEX-PUR_GROUP, sy-vline,
  WA_MEWIEINEX-CURRENCY, sy-vline,
  WA_MEWIEINEX-BONUS, sy-vline,
  WA_MEWIEINEX-BONUS_QTY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEWIEINEX 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_MEWIEINEX 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_MEWIEINEX INTO WA_MEWIEINEX.


*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_MEWIEINEX_STR, 
INFO_REC TYPE STRING,
PURCH_ORG TYPE STRING,
INFO_TYPE TYPE STRING,
PLANT TYPE STRING,
DELETE_IND TYPE STRING,
CREATED_AT TYPE STRING,
CREATED_BY TYPE STRING,
PUR_GROUP TYPE STRING,
CURRENCY TYPE STRING,
BONUS TYPE STRING,
BONUS_QTY TYPE STRING,
MIN_PO_QTY TYPE STRING,
NRM_PO_QTY TYPE STRING,
PLND_DELRY TYPE STRING,
OVERDELTOL TYPE STRING,
UNLIMITED TYPE STRING,
UNDER_TOL TYPE STRING,
QUOTATION TYPE STRING,
QUOT_DATE TYPE STRING,
RFQ_NO TYPE STRING,
RFQ_ITEM TYPE STRING,
RFQ_CANC TYPE STRING,
AMORT_FROM TYPE STRING,
AMORT_TO TYPE STRING,
AMORT_QTY TYPE STRING,
AMORT_VAL TYPE STRING,
AMORT_TQTY TYPE STRING,
AMORT_TVAL TYPE STRING,
AMORT_RES TYPE STRING,
DOC_CAT TYPE STRING,
PO_NUMBER TYPE STRING,
PO_ITEM TYPE STRING,
LAST_PO TYPE STRING,
NET_PRICE TYPE STRING,
PRICE_UNIT TYPE STRING,
ORDERPR_UN TYPE STRING,
PRICE_DATE TYPE STRING,
CONV_NUM1 TYPE STRING,
CONV_DEN1 TYPE STRING,
NO_MATTEXT TYPE STRING,
GR_BASEDIV TYPE STRING,
EFF_PRICE TYPE STRING,
COND_GROUP TYPE STRING,
NO_DISCT TYPE STRING,
ACKN_REQD TYPE STRING,
TAX_CODE TYPE STRING,
VAL_TYPE TYPE STRING,
BON_GRP1 TYPE STRING,
SHIPPING TYPE STRING,
EXP_IMP_P TYPE STRING,
CONF_CTRL TYPE STRING,
PRICEDATE TYPE STRING,
INCOTERMS1 TYPE STRING,
INCOTERMS2 TYPE STRING,
NO_AUT_GR TYPE STRING,
BON_GRP2 TYPE STRING,
BON_GRP3 TYPE STRING,
NO_BON_ITM TYPE STRING,
MINREMLIFE TYPE STRING,
VERSION TYPE STRING,
MAX_PO_QTY TYPE STRING,
ROUND_PROF TYPE STRING,
UNIT_GROUP TYPE STRING,
BRAS_NBM TYPE STRING,
CURRENCY_ISO TYPE STRING,
ORDERPR_UN_ISO TYPE STRING,
VENDOR TYPE STRING,
INCOTERMSV TYPE STRING,
INCOTERMS2L TYPE STRING,
INCOTERMS3L TYPE STRING,
PERIOD_IND_EXPIRATION_DATE TYPE STRING,
VENDOR_RMA_REQ TYPE STRING,
AUTO_SOURCE TYPE STRING,
TXDAT_FROM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEWIEINEX_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_MEWIEINEX_STR-INFO_REC sy-vline 
WA_MEWIEINEX_STR-PURCH_ORG sy-vline 
WA_MEWIEINEX_STR-INFO_TYPE sy-vline 
WA_MEWIEINEX_STR-PLANT sy-vline 
WA_MEWIEINEX_STR-DELETE_IND sy-vline 
WA_MEWIEINEX_STR-CREATED_AT sy-vline 
WA_MEWIEINEX_STR-CREATED_BY sy-vline 
WA_MEWIEINEX_STR-PUR_GROUP sy-vline 
WA_MEWIEINEX_STR-CURRENCY sy-vline 
WA_MEWIEINEX_STR-BONUS sy-vline 
WA_MEWIEINEX_STR-BONUS_QTY sy-vline 
WA_MEWIEINEX_STR-MIN_PO_QTY sy-vline 
WA_MEWIEINEX_STR-NRM_PO_QTY sy-vline 
WA_MEWIEINEX_STR-PLND_DELRY sy-vline 
WA_MEWIEINEX_STR-OVERDELTOL sy-vline 
WA_MEWIEINEX_STR-UNLIMITED sy-vline 
WA_MEWIEINEX_STR-UNDER_TOL sy-vline 
WA_MEWIEINEX_STR-QUOTATION sy-vline 
WA_MEWIEINEX_STR-QUOT_DATE sy-vline 
WA_MEWIEINEX_STR-RFQ_NO sy-vline 
WA_MEWIEINEX_STR-RFQ_ITEM sy-vline 
WA_MEWIEINEX_STR-RFQ_CANC sy-vline 
WA_MEWIEINEX_STR-AMORT_FROM sy-vline 
WA_MEWIEINEX_STR-AMORT_TO sy-vline 
WA_MEWIEINEX_STR-AMORT_QTY sy-vline 
WA_MEWIEINEX_STR-AMORT_VAL sy-vline 
WA_MEWIEINEX_STR-AMORT_TQTY sy-vline 
WA_MEWIEINEX_STR-AMORT_TVAL sy-vline 
WA_MEWIEINEX_STR-AMORT_RES sy-vline 
WA_MEWIEINEX_STR-DOC_CAT sy-vline 
WA_MEWIEINEX_STR-PO_NUMBER sy-vline 
WA_MEWIEINEX_STR-PO_ITEM sy-vline 
WA_MEWIEINEX_STR-LAST_PO sy-vline 
WA_MEWIEINEX_STR-NET_PRICE sy-vline 
WA_MEWIEINEX_STR-PRICE_UNIT sy-vline 
WA_MEWIEINEX_STR-ORDERPR_UN sy-vline 
WA_MEWIEINEX_STR-PRICE_DATE sy-vline 
WA_MEWIEINEX_STR-CONV_NUM1 sy-vline 
WA_MEWIEINEX_STR-CONV_DEN1 sy-vline 
WA_MEWIEINEX_STR-NO_MATTEXT sy-vline 
WA_MEWIEINEX_STR-GR_BASEDIV sy-vline 
WA_MEWIEINEX_STR-EFF_PRICE sy-vline 
WA_MEWIEINEX_STR-COND_GROUP sy-vline 
WA_MEWIEINEX_STR-NO_DISCT sy-vline 
WA_MEWIEINEX_STR-ACKN_REQD sy-vline 
WA_MEWIEINEX_STR-TAX_CODE sy-vline 
WA_MEWIEINEX_STR-VAL_TYPE sy-vline 
WA_MEWIEINEX_STR-BON_GRP1 sy-vline 
WA_MEWIEINEX_STR-SHIPPING sy-vline 
WA_MEWIEINEX_STR-EXP_IMP_P sy-vline 
WA_MEWIEINEX_STR-CONF_CTRL sy-vline 
WA_MEWIEINEX_STR-PRICEDATE sy-vline 
WA_MEWIEINEX_STR-INCOTERMS1 sy-vline 
WA_MEWIEINEX_STR-INCOTERMS2 sy-vline 
WA_MEWIEINEX_STR-NO_AUT_GR sy-vline 
WA_MEWIEINEX_STR-BON_GRP2 sy-vline 
WA_MEWIEINEX_STR-BON_GRP3 sy-vline 
WA_MEWIEINEX_STR-NO_BON_ITM sy-vline 
WA_MEWIEINEX_STR-MINREMLIFE sy-vline 
WA_MEWIEINEX_STR-VERSION sy-vline 
WA_MEWIEINEX_STR-MAX_PO_QTY sy-vline 
WA_MEWIEINEX_STR-ROUND_PROF sy-vline 
WA_MEWIEINEX_STR-UNIT_GROUP sy-vline 
WA_MEWIEINEX_STR-BRAS_NBM sy-vline 
WA_MEWIEINEX_STR-CURRENCY_ISO sy-vline 
WA_MEWIEINEX_STR-ORDERPR_UN_ISO sy-vline 
WA_MEWIEINEX_STR-VENDOR sy-vline 
WA_MEWIEINEX_STR-INCOTERMSV sy-vline 
WA_MEWIEINEX_STR-INCOTERMS2L sy-vline 
WA_MEWIEINEX_STR-INCOTERMS3L sy-vline 
WA_MEWIEINEX_STR-PERIOD_IND_EXPIRATION_DATE sy-vline 
WA_MEWIEINEX_STR-VENDOR_RMA_REQ sy-vline 
WA_MEWIEINEX_STR-AUTO_SOURCE sy-vline 
WA_MEWIEINEX_STR-TXDAT_FROM sy-vline      INTO ld_text SEPARATED BY SPACE.

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