ABAP Select data from SAP table A144 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP A144 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 A144. 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 A144 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_A144 TYPE STANDARD TABLE OF A144,
      WA_A144 TYPE A144,
      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: <A144> TYPE A144.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_A144.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM A144
  INTO TABLE IT_A144.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM A144
*  INTO TABLE @DATA(IT_A1442).
*--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_A144 INDEX 1 INTO DATA(WA_A1442).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_A144 ASSIGNING <A144>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<A144>-MANDT = 1.
<A144>-KAPPL = 1.
<A144>-KSCHL = 1.
<A144>-KNUMA_AG = 1.
<A144>-VKORG = 1.

ENDLOOP.

LOOP AT IT_A144 INTO WA_A144.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_A144-KONDM, sy-vline,
  WA_A144-PRODH1, sy-vline,
  WA_A144-PRODH2, sy-vline,
  WA_A144-PRODH3, sy-vline,
  WA_A144-MATNR, sy-vline,
  WA_A144-DATBI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_A144 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_A144 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_A144 INTO WA_A144.


*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 KNUMA_AG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_A144-KNUMA_AG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_A144-KNUMA_AG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_A144-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_A144-MATNR.
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_A144_STR, 
MANDT TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
KNUMA_AG TYPE STRING,
VKORG TYPE STRING,
KONDM TYPE STRING,
PRODH1 TYPE STRING,
PRODH2 TYPE STRING,
PRODH3 TYPE STRING,
MATNR TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
KDATU TYPE STRING,
PLTYP TYPE STRING,
KSTAF TYPE STRING,
KNUMH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_A144_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_A144_STR-MANDT sy-vline 
WA_A144_STR-KAPPL sy-vline 
WA_A144_STR-KSCHL sy-vline 
WA_A144_STR-KNUMA_AG sy-vline 
WA_A144_STR-VKORG sy-vline 
WA_A144_STR-KONDM sy-vline 
WA_A144_STR-PRODH1 sy-vline 
WA_A144_STR-PRODH2 sy-vline 
WA_A144_STR-PRODH3 sy-vline 
WA_A144_STR-MATNR sy-vline 
WA_A144_STR-DATBI sy-vline 
WA_A144_STR-DATAB sy-vline 
WA_A144_STR-KDATU sy-vline 
WA_A144_STR-PLTYP sy-vline 
WA_A144_STR-KSTAF sy-vline 
WA_A144_STR-KNUMH sy-vline      INTO ld_text SEPARATED BY SPACE.

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