ABAP Select data from SAP table T312S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T312S 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 T312S. 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 T312S 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_T312S TYPE STANDARD TABLE OF T312S,
      WA_T312S TYPE T312S,
      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: <T312S> TYPE T312S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T312S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T312S
  INTO TABLE IT_T312S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T312S
*  INTO TABLE @DATA(IT_T312S2).
*--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_T312S INDEX 1 INTO DATA(WA_T312S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T312S ASSIGNING <T312S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T312S>-MANDT = 1.
<T312S>-SORPO = 1.
<T312S>-LGNUM = 1.
<T312S>-SOKNZ = 1.
<T312S>-SRT00 = 1.

ENDLOOP.

LOOP AT IT_T312S INTO WA_T312S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T312S-SRT01, sy-vline,
  WA_T312S-SRT02, sy-vline,
  WA_T312S-SRT03, sy-vline,
  WA_T312S-SRT04, sy-vline,
  WA_T312S-SRT05, sy-vline,
  WA_T312S-SRT06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T312S 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_T312S 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_T312S INTO WA_T312S.


*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_T312S_STR, 
MANDT TYPE STRING,
SORPO TYPE STRING,
LGNUM TYPE STRING,
SOKNZ TYPE STRING,
SRT00 TYPE STRING,
SRT01 TYPE STRING,
SRT02 TYPE STRING,
SRT03 TYPE STRING,
SRT04 TYPE STRING,
SRT05 TYPE STRING,
SRT06 TYPE STRING,
SRT07 TYPE STRING,
SRT08 TYPE STRING,
SRT09 TYPE STRING,
SRT10 TYPE STRING,
SRT11 TYPE STRING,
SRT12 TYPE STRING,
SRT13 TYPE STRING,
SRT14 TYPE STRING,
GRW00 TYPE STRING,
GRW01 TYPE STRING,
GRW02 TYPE STRING,
GRW03 TYPE STRING,
GRW04 TYPE STRING,
GRW05 TYPE STRING,
GRW06 TYPE STRING,
GRW07 TYPE STRING,
GRW08 TYPE STRING,
GRW09 TYPE STRING,
GRW10 TYPE STRING,
GRW11 TYPE STRING,
GRW12 TYPE STRING,
GRW13 TYPE STRING,
GRW14 TYPE STRING,
SRI00 TYPE STRING,
SRI01 TYPE STRING,
SRI02 TYPE STRING,
SRI03 TYPE STRING,
SRI04 TYPE STRING,
SRI05 TYPE STRING,
SRI06 TYPE STRING,
SRI07 TYPE STRING,
SRI08 TYPE STRING,
SRI09 TYPE STRING,
SRI10 TYPE STRING,
SRI11 TYPE STRING,
SRI12 TYPE STRING,
SRI13 TYPE STRING,
SRI14 TYPE STRING,
SORRI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T312S_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_T312S_STR-MANDT sy-vline 
WA_T312S_STR-SORPO sy-vline 
WA_T312S_STR-LGNUM sy-vline 
WA_T312S_STR-SOKNZ sy-vline 
WA_T312S_STR-SRT00 sy-vline 
WA_T312S_STR-SRT01 sy-vline 
WA_T312S_STR-SRT02 sy-vline 
WA_T312S_STR-SRT03 sy-vline 
WA_T312S_STR-SRT04 sy-vline 
WA_T312S_STR-SRT05 sy-vline 
WA_T312S_STR-SRT06 sy-vline 
WA_T312S_STR-SRT07 sy-vline 
WA_T312S_STR-SRT08 sy-vline 
WA_T312S_STR-SRT09 sy-vline 
WA_T312S_STR-SRT10 sy-vline 
WA_T312S_STR-SRT11 sy-vline 
WA_T312S_STR-SRT12 sy-vline 
WA_T312S_STR-SRT13 sy-vline 
WA_T312S_STR-SRT14 sy-vline 
WA_T312S_STR-GRW00 sy-vline 
WA_T312S_STR-GRW01 sy-vline 
WA_T312S_STR-GRW02 sy-vline 
WA_T312S_STR-GRW03 sy-vline 
WA_T312S_STR-GRW04 sy-vline 
WA_T312S_STR-GRW05 sy-vline 
WA_T312S_STR-GRW06 sy-vline 
WA_T312S_STR-GRW07 sy-vline 
WA_T312S_STR-GRW08 sy-vline 
WA_T312S_STR-GRW09 sy-vline 
WA_T312S_STR-GRW10 sy-vline 
WA_T312S_STR-GRW11 sy-vline 
WA_T312S_STR-GRW12 sy-vline 
WA_T312S_STR-GRW13 sy-vline 
WA_T312S_STR-GRW14 sy-vline 
WA_T312S_STR-SRI00 sy-vline 
WA_T312S_STR-SRI01 sy-vline 
WA_T312S_STR-SRI02 sy-vline 
WA_T312S_STR-SRI03 sy-vline 
WA_T312S_STR-SRI04 sy-vline 
WA_T312S_STR-SRI05 sy-vline 
WA_T312S_STR-SRI06 sy-vline 
WA_T312S_STR-SRI07 sy-vline 
WA_T312S_STR-SRI08 sy-vline 
WA_T312S_STR-SRI09 sy-vline 
WA_T312S_STR-SRI10 sy-vline 
WA_T312S_STR-SRI11 sy-vline 
WA_T312S_STR-SRI12 sy-vline 
WA_T312S_STR-SRI13 sy-vline 
WA_T312S_STR-SRI14 sy-vline 
WA_T312S_STR-SORRI sy-vline      INTO ld_text SEPARATED BY SPACE.

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