ABAP Select data from SAP table T313B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T313B 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 T313B. 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 T313B 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_T313B TYPE STANDARD TABLE OF T313B,
      WA_T313B TYPE T313B,
      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: <T313B> TYPE T313B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T313B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T313B
  INTO TABLE IT_T313B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T313B
*  INTO TABLE @DATA(IT_T313B2).
*--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_T313B INDEX 1 INTO DATA(WA_T313B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T313B ASSIGNING <T313B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T313B>-MANDT = 1.
<T313B>-LGNUM = 1.
<T313B>-PROFI = 1.
<T313B>-VSBIN = 1.
<T313B>-VDBIN = 1.

ENDLOOP.

LOOP AT IT_T313B INTO WA_T313B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T313B-VSOSU, sy-vline,
  WA_T313B-VDESU, sy-vline,
  WA_T313B-VSQUA, sy-vline,
  WA_T313B-VDQUA, sy-vline,
  WA_T313B-VSMAT, sy-vline,
  WA_T313B-VDMAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T313B 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_T313B 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_T313B INTO WA_T313B.


*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_T313B_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
PROFI TYPE STRING,
VSBIN TYPE STRING,
VDBIN TYPE STRING,
VSOSU TYPE STRING,
VDESU TYPE STRING,
VSQUA TYPE STRING,
VDQUA TYPE STRING,
VSMAT TYPE STRING,
VDMAT TYPE STRING,
VSBAT TYPE STRING,
VDBAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T313B_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_T313B_STR-MANDT sy-vline 
WA_T313B_STR-LGNUM sy-vline 
WA_T313B_STR-PROFI sy-vline 
WA_T313B_STR-VSBIN sy-vline 
WA_T313B_STR-VDBIN sy-vline 
WA_T313B_STR-VSOSU sy-vline 
WA_T313B_STR-VDESU sy-vline 
WA_T313B_STR-VSQUA sy-vline 
WA_T313B_STR-VDQUA sy-vline 
WA_T313B_STR-VSMAT sy-vline 
WA_T313B_STR-VDMAT sy-vline 
WA_T313B_STR-VSBAT sy-vline 
WA_T313B_STR-VDBAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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