ABAP Select data from SAP table MEWIEINAX into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEWIEINAX
*  INTO TABLE @DATA(IT_MEWIEINAX2).
*--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_MEWIEINAX INDEX 1 INTO DATA(WA_MEWIEINAX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEWIEINAX>-INFO_REC = 1.
<MEWIEINAX>-MATERIAL = 1.
<MEWIEINAX>-MAT_GRP = 1.
<MEWIEINAX>-VENDOR = 1.
<MEWIEINAX>-DELETE_IND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEWIEINAX-CREATED_AT, sy-vline,
  WA_MEWIEINAX-CREATED_BY, sy-vline,
  WA_MEWIEINAX-SHORT_TEXT, sy-vline,
  WA_MEWIEINAX-SORTED_BY, sy-vline,
  WA_MEWIEINAX-PO_UNIT, sy-vline,
  WA_MEWIEINAX-CONV_NUM1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEWIEINAX 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_MEWIEINAX 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_MEWIEINAX INTO WA_MEWIEINAX.


*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_MEWIEINAX_STR, 
INFO_REC TYPE STRING,
MATERIAL TYPE STRING,
MAT_GRP TYPE STRING,
VENDOR TYPE STRING,
DELETE_IND TYPE STRING,
CREATED_AT TYPE STRING,
CREATED_BY TYPE STRING,
SHORT_TEXT TYPE STRING,
SORTED_BY TYPE STRING,
PO_UNIT TYPE STRING,
CONV_NUM1 TYPE STRING,
CONV_DEN1 TYPE STRING,
VEND_MAT TYPE STRING,
SALES_PERS TYPE STRING,
TELEPHONE TYPE STRING,
REMINDER1 TYPE STRING,
REMINDER2 TYPE STRING,
REMINDER3 TYPE STRING,
CERT_NO TYPE STRING,
CERT_VALID TYPE STRING,
CERT_CTRY TYPE STRING,
CERT_TYPE TYPE STRING,
CUST_NO TYPE STRING,
BASE_UOM TYPE STRING,
REGION TYPE STRING,
VAR_ORD_UN TYPE STRING,
VEND_PART TYPE STRING,
SORT_NO TYPE STRING,
VEND_MATG TYPE STRING,
BACK_AGREE TYPE STRING,
SUPPL_FROM TYPE STRING,
SUPPL_TO TYPE STRING,
PRE_VENDOR TYPE STRING,
POINTS TYPE STRING,
POINT_UNIT TYPE STRING,
NORM_VEND TYPE STRING,
PO_UNIT_ISO TYPE STRING,
BASE_UOM_ISO TYPE STRING,
MANUFACTURER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEWIEINAX_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_MEWIEINAX_STR-INFO_REC sy-vline 
WA_MEWIEINAX_STR-MATERIAL sy-vline 
WA_MEWIEINAX_STR-MAT_GRP sy-vline 
WA_MEWIEINAX_STR-VENDOR sy-vline 
WA_MEWIEINAX_STR-DELETE_IND sy-vline 
WA_MEWIEINAX_STR-CREATED_AT sy-vline 
WA_MEWIEINAX_STR-CREATED_BY sy-vline 
WA_MEWIEINAX_STR-SHORT_TEXT sy-vline 
WA_MEWIEINAX_STR-SORTED_BY sy-vline 
WA_MEWIEINAX_STR-PO_UNIT sy-vline 
WA_MEWIEINAX_STR-CONV_NUM1 sy-vline 
WA_MEWIEINAX_STR-CONV_DEN1 sy-vline 
WA_MEWIEINAX_STR-VEND_MAT sy-vline 
WA_MEWIEINAX_STR-SALES_PERS sy-vline 
WA_MEWIEINAX_STR-TELEPHONE sy-vline 
WA_MEWIEINAX_STR-REMINDER1 sy-vline 
WA_MEWIEINAX_STR-REMINDER2 sy-vline 
WA_MEWIEINAX_STR-REMINDER3 sy-vline 
WA_MEWIEINAX_STR-CERT_NO sy-vline 
WA_MEWIEINAX_STR-CERT_VALID sy-vline 
WA_MEWIEINAX_STR-CERT_CTRY sy-vline 
WA_MEWIEINAX_STR-CERT_TYPE sy-vline 
WA_MEWIEINAX_STR-CUST_NO sy-vline 
WA_MEWIEINAX_STR-BASE_UOM sy-vline 
WA_MEWIEINAX_STR-REGION sy-vline 
WA_MEWIEINAX_STR-VAR_ORD_UN sy-vline 
WA_MEWIEINAX_STR-VEND_PART sy-vline 
WA_MEWIEINAX_STR-SORT_NO sy-vline 
WA_MEWIEINAX_STR-VEND_MATG sy-vline 
WA_MEWIEINAX_STR-BACK_AGREE sy-vline 
WA_MEWIEINAX_STR-SUPPL_FROM sy-vline 
WA_MEWIEINAX_STR-SUPPL_TO sy-vline 
WA_MEWIEINAX_STR-PRE_VENDOR sy-vline 
WA_MEWIEINAX_STR-POINTS sy-vline 
WA_MEWIEINAX_STR-POINT_UNIT sy-vline 
WA_MEWIEINAX_STR-NORM_VEND sy-vline 
WA_MEWIEINAX_STR-PO_UNIT_ISO sy-vline 
WA_MEWIEINAX_STR-BASE_UOM_ISO sy-vline 
WA_MEWIEINAX_STR-MANUFACTURER sy-vline      INTO ld_text SEPARATED BY SPACE.

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