ABAP Select data from SAP table T164A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T164A 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 T164A. 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 T164A 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_T164A TYPE STANDARD TABLE OF T164A,
      WA_T164A TYPE T164A,
      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: <T164A> TYPE T164A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T164A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T164A
  INTO TABLE IT_T164A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T164A
*  INTO TABLE @DATA(IT_T164A2).
*--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_T164A INDEX 1 INTO DATA(WA_T164A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T164A ASSIGNING <T164A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T164A>-ART = 1.
<T164A>-EXS = 1.
<T164A>-EXP = 1.
<T164A>-VZV = 1.
<T164A>-VZL = 1.

ENDLOOP.

LOOP AT IT_T164A INTO WA_T164A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T164A-SSP, sy-vline,
  WA_T164A-SML, sy-vline,
  WA_T164A-TYP, sy-vline,
  WA_T164A-MASTER, sy-vline,
  WA_T164A-DEBUG, sy-vline,
  WA_T164A-COOKED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T164A 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_T164A 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_T164A INTO WA_T164A.


*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_T164A_STR, 
ART TYPE STRING,
EXS TYPE STRING,
EXP TYPE STRING,
VZV TYPE STRING,
VZL TYPE STRING,
SSP TYPE STRING,
SML TYPE STRING,
TYP TYPE STRING,
MASTER TYPE STRING,
DEBUG TYPE STRING,
COOKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T164A_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_T164A_STR-ART sy-vline 
WA_T164A_STR-EXS sy-vline 
WA_T164A_STR-EXP sy-vline 
WA_T164A_STR-VZV sy-vline 
WA_T164A_STR-VZL sy-vline 
WA_T164A_STR-SSP sy-vline 
WA_T164A_STR-SML sy-vline 
WA_T164A_STR-TYP sy-vline 
WA_T164A_STR-MASTER sy-vline 
WA_T164A_STR-DEBUG sy-vline 
WA_T164A_STR-COOKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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