ABAP Select data from SAP table T337A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T337A 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 T337A. 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 T337A 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_T337A TYPE STANDARD TABLE OF T337A,
      WA_T337A TYPE T337A,
      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: <T337A> TYPE T337A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T337A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T337A
  INTO TABLE IT_T337A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T337A
*  INTO TABLE @DATA(IT_T337A2).
*--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_T337A INDEX 1 INTO DATA(WA_T337A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T337A ASSIGNING <T337A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T337A>-MANDT = 1.
<T337A>-LGNUM = 1.
<T337A>-LGTYP = 1.
<T337A>-PLAUF = 1.
<T337A>-MAXQU = 1.

ENDLOOP.

LOOP AT IT_T337A INTO WA_T337A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T337A-POS01, sy-vline,
  WA_T337A-POS02, sy-vline,
  WA_T337A-POS03, sy-vline,
  WA_T337A-POS04, sy-vline,
  WA_T337A-POS05, sy-vline,
  WA_T337A-POS06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T337A 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_T337A 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_T337A INTO WA_T337A.


*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_T337A_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
PLAUF TYPE STRING,
MAXQU TYPE STRING,
POS01 TYPE STRING,
POS02 TYPE STRING,
POS03 TYPE STRING,
POS04 TYPE STRING,
POS05 TYPE STRING,
POS06 TYPE STRING,
POS07 TYPE STRING,
POS08 TYPE STRING,
POS09 TYPE STRING,
POS10 TYPE STRING,
POS11 TYPE STRING,
POS12 TYPE STRING,
POS13 TYPE STRING,
POS14 TYPE STRING,
POS15 TYPE STRING,
POS16 TYPE STRING,
POS17 TYPE STRING,
POS18 TYPE STRING,
POS19 TYPE STRING,
POS20 TYPE STRING,
POS21 TYPE STRING,
POS22 TYPE STRING,
POS23 TYPE STRING,
POS24 TYPE STRING,
POS25 TYPE STRING,
POS26 TYPE STRING,
POS27 TYPE STRING,
POS28 TYPE STRING,
POS29 TYPE STRING,
POS30 TYPE STRING,
POS31 TYPE STRING,
POS32 TYPE STRING,
POS33 TYPE STRING,
POS34 TYPE STRING,
POS35 TYPE STRING,
POS36 TYPE STRING,
POS37 TYPE STRING,
POS38 TYPE STRING,
POS39 TYPE STRING,
POS40 TYPE STRING,
POS41 TYPE STRING,
POS42 TYPE STRING,
POS43 TYPE STRING,
POS44 TYPE STRING,
POS45 TYPE STRING,
POS46 TYPE STRING,
POS47 TYPE STRING,
POS48 TYPE STRING,
POS49 TYPE STRING,
POS50 TYPE STRING,
POS51 TYPE STRING,
POS52 TYPE STRING,
POS53 TYPE STRING,
POS54 TYPE STRING,
POS55 TYPE STRING,
POS56 TYPE STRING,
POS57 TYPE STRING,
POS58 TYPE STRING,
POS59 TYPE STRING,
POS60 TYPE STRING,
POS61 TYPE STRING,
POS62 TYPE STRING,
POS63 TYPE STRING,
POS64 TYPE STRING,
POS65 TYPE STRING,
POS66 TYPE STRING,
POS67 TYPE STRING,
POS68 TYPE STRING,
POS69 TYPE STRING,
POS70 TYPE STRING,
POS71 TYPE STRING,
POS72 TYPE STRING,
POS73 TYPE STRING,
POS74 TYPE STRING,
POS75 TYPE STRING,
POS76 TYPE STRING,
POS77 TYPE STRING,
POS78 TYPE STRING,
POS79 TYPE STRING,
POS80 TYPE STRING,
POS81 TYPE STRING,
POS82 TYPE STRING,
POS83 TYPE STRING,
POS84 TYPE STRING,
POS85 TYPE STRING,
POS86 TYPE STRING,
POS87 TYPE STRING,
POS88 TYPE STRING,
POS89 TYPE STRING,
POS90 TYPE STRING,
POS91 TYPE STRING,
POS92 TYPE STRING,
POS93 TYPE STRING,
POS94 TYPE STRING,
POS95 TYPE STRING,
POS96 TYPE STRING,
POS97 TYPE STRING,
POS98 TYPE STRING,
POS99 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T337A_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_T337A_STR-MANDT sy-vline 
WA_T337A_STR-LGNUM sy-vline 
WA_T337A_STR-LGTYP sy-vline 
WA_T337A_STR-PLAUF sy-vline 
WA_T337A_STR-MAXQU sy-vline 
WA_T337A_STR-POS01 sy-vline 
WA_T337A_STR-POS02 sy-vline 
WA_T337A_STR-POS03 sy-vline 
WA_T337A_STR-POS04 sy-vline 
WA_T337A_STR-POS05 sy-vline 
WA_T337A_STR-POS06 sy-vline 
WA_T337A_STR-POS07 sy-vline 
WA_T337A_STR-POS08 sy-vline 
WA_T337A_STR-POS09 sy-vline 
WA_T337A_STR-POS10 sy-vline 
WA_T337A_STR-POS11 sy-vline 
WA_T337A_STR-POS12 sy-vline 
WA_T337A_STR-POS13 sy-vline 
WA_T337A_STR-POS14 sy-vline 
WA_T337A_STR-POS15 sy-vline 
WA_T337A_STR-POS16 sy-vline 
WA_T337A_STR-POS17 sy-vline 
WA_T337A_STR-POS18 sy-vline 
WA_T337A_STR-POS19 sy-vline 
WA_T337A_STR-POS20 sy-vline 
WA_T337A_STR-POS21 sy-vline 
WA_T337A_STR-POS22 sy-vline 
WA_T337A_STR-POS23 sy-vline 
WA_T337A_STR-POS24 sy-vline 
WA_T337A_STR-POS25 sy-vline 
WA_T337A_STR-POS26 sy-vline 
WA_T337A_STR-POS27 sy-vline 
WA_T337A_STR-POS28 sy-vline 
WA_T337A_STR-POS29 sy-vline 
WA_T337A_STR-POS30 sy-vline 
WA_T337A_STR-POS31 sy-vline 
WA_T337A_STR-POS32 sy-vline 
WA_T337A_STR-POS33 sy-vline 
WA_T337A_STR-POS34 sy-vline 
WA_T337A_STR-POS35 sy-vline 
WA_T337A_STR-POS36 sy-vline 
WA_T337A_STR-POS37 sy-vline 
WA_T337A_STR-POS38 sy-vline 
WA_T337A_STR-POS39 sy-vline 
WA_T337A_STR-POS40 sy-vline 
WA_T337A_STR-POS41 sy-vline 
WA_T337A_STR-POS42 sy-vline 
WA_T337A_STR-POS43 sy-vline 
WA_T337A_STR-POS44 sy-vline 
WA_T337A_STR-POS45 sy-vline 
WA_T337A_STR-POS46 sy-vline 
WA_T337A_STR-POS47 sy-vline 
WA_T337A_STR-POS48 sy-vline 
WA_T337A_STR-POS49 sy-vline 
WA_T337A_STR-POS50 sy-vline 
WA_T337A_STR-POS51 sy-vline 
WA_T337A_STR-POS52 sy-vline 
WA_T337A_STR-POS53 sy-vline 
WA_T337A_STR-POS54 sy-vline 
WA_T337A_STR-POS55 sy-vline 
WA_T337A_STR-POS56 sy-vline 
WA_T337A_STR-POS57 sy-vline 
WA_T337A_STR-POS58 sy-vline 
WA_T337A_STR-POS59 sy-vline 
WA_T337A_STR-POS60 sy-vline 
WA_T337A_STR-POS61 sy-vline 
WA_T337A_STR-POS62 sy-vline 
WA_T337A_STR-POS63 sy-vline 
WA_T337A_STR-POS64 sy-vline 
WA_T337A_STR-POS65 sy-vline 
WA_T337A_STR-POS66 sy-vline 
WA_T337A_STR-POS67 sy-vline 
WA_T337A_STR-POS68 sy-vline 
WA_T337A_STR-POS69 sy-vline 
WA_T337A_STR-POS70 sy-vline 
WA_T337A_STR-POS71 sy-vline 
WA_T337A_STR-POS72 sy-vline 
WA_T337A_STR-POS73 sy-vline 
WA_T337A_STR-POS74 sy-vline 
WA_T337A_STR-POS75 sy-vline 
WA_T337A_STR-POS76 sy-vline 
WA_T337A_STR-POS77 sy-vline 
WA_T337A_STR-POS78 sy-vline 
WA_T337A_STR-POS79 sy-vline 
WA_T337A_STR-POS80 sy-vline 
WA_T337A_STR-POS81 sy-vline 
WA_T337A_STR-POS82 sy-vline 
WA_T337A_STR-POS83 sy-vline 
WA_T337A_STR-POS84 sy-vline 
WA_T337A_STR-POS85 sy-vline 
WA_T337A_STR-POS86 sy-vline 
WA_T337A_STR-POS87 sy-vline 
WA_T337A_STR-POS88 sy-vline 
WA_T337A_STR-POS89 sy-vline 
WA_T337A_STR-POS90 sy-vline 
WA_T337A_STR-POS91 sy-vline 
WA_T337A_STR-POS92 sy-vline 
WA_T337A_STR-POS93 sy-vline 
WA_T337A_STR-POS94 sy-vline 
WA_T337A_STR-POS95 sy-vline 
WA_T337A_STR-POS96 sy-vline 
WA_T337A_STR-POS97 sy-vline 
WA_T337A_STR-POS98 sy-vline 
WA_T337A_STR-POS99 sy-vline      INTO ld_text SEPARATED BY SPACE.

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