ABAP Select data from SAP table AT10X into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP AT10X 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 AT10X. 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 AT10X 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_AT10X TYPE STANDARD TABLE OF AT10X,
      WA_AT10X TYPE AT10X,
      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: <AT10X> TYPE AT10X.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_AT10X.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM AT10X
  INTO TABLE IT_AT10X.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AT10X
*  INTO TABLE @DATA(IT_AT10X2).
*--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_AT10X INDEX 1 INTO DATA(WA_AT10X2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_AT10X ASSIGNING <AT10X>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AT10X>-MANDT = 1.
<AT10X>-SGSART = 1.
<AT10X>-SFHAART = 1.
<AT10X>-VKURSTYP = 1.
<AT10X>-VKURSART = 1.

ENDLOOP.

LOOP AT IT_AT10X INTO WA_AT10X.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AT10X-VKURSHDL, sy-vline,
  WA_AT10X-VSSEEK, sy-vline,
  WA_AT10X-PTSFHA, sy-vline,
  WA_AT10X-PKSFHA, sy-vline,
  WA_AT10X-VTSFHA, sy-vline,
  WA_AT10X-VKSFHA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AT10X 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_AT10X 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_AT10X INTO WA_AT10X.


*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_AT10X_STR, 
MANDT TYPE STRING,
SGSART TYPE STRING,
SFHAART TYPE STRING,
VKURSTYP TYPE STRING,
VKURSART TYPE STRING,
VKURSHDL TYPE STRING,
VSSEEK TYPE STRING,
PTSFHA TYPE STRING,
PKSFHA TYPE STRING,
VTSFHA TYPE STRING,
VKSFHA TYPE STRING,
CALHWBTR TYPE STRING,
RATEPROP TYPE STRING,
NEWBASE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AT10X_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_AT10X_STR-MANDT sy-vline 
WA_AT10X_STR-SGSART sy-vline 
WA_AT10X_STR-SFHAART sy-vline 
WA_AT10X_STR-VKURSTYP sy-vline 
WA_AT10X_STR-VKURSART sy-vline 
WA_AT10X_STR-VKURSHDL sy-vline 
WA_AT10X_STR-VSSEEK sy-vline 
WA_AT10X_STR-PTSFHA sy-vline 
WA_AT10X_STR-PKSFHA sy-vline 
WA_AT10X_STR-VTSFHA sy-vline 
WA_AT10X_STR-VKSFHA sy-vline 
WA_AT10X_STR-CALHWBTR sy-vline 
WA_AT10X_STR-RATEPROP sy-vline 
WA_AT10X_STR-NEWBASE sy-vline      INTO ld_text SEPARATED BY SPACE.

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