ABAP Select data from SAP table LTR2_STR_TABLE_STRUCTURE into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP LTR2_STR_TABLE_STRUCTURE 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 LTR2_STR_TABLE_STRUCTURE. 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 LTR2_STR_TABLE_STRUCTURE 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_LTR2_STR_TABLE_STRUCTURE TYPE STANDARD TABLE OF LTR2_STR_TABLE_STRUCTURE,
      WA_LTR2_STR_TABLE_STRUCTURE TYPE LTR2_STR_TABLE_STRUCTURE,
      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: <LTR2_STR_TABLE_STRUCTURE> TYPE LTR2_STR_TABLE_STRUCTURE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LTR2_STR_TABLE_STRUCTURE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LTR2_STR_TABLE_STRUCTURE
  INTO TABLE IT_LTR2_STR_TABLE_STRUCTURE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LTR2_STR_TABLE_STRUCTURE
*  INTO TABLE @DATA(IT_LTR2_STR_TABLE_STRUCTURE2).
*--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_LTR2_STR_TABLE_STRUCTURE INDEX 1 INTO DATA(WA_LTR2_STR_TABLE_STRUCTURE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LTR2_STR_TABLE_STRUCTURE ASSIGNING <LTR2_STR_TABLE_STRUCTURE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LTR2_STR_TABLE_STRUCTURE>-_LINK_SEL = 1.
<LTR2_STR_TABLE_STRUCTURE>-_LINK_TRULE_TABLE = 1.
<LTR2_STR_TABLE_STRUCTURE>-FIELDNAME = 1.
<LTR2_STR_TABLE_STRUCTURE>-IS_KEY = 1.
<LTR2_STR_TABLE_STRUCTURE>-ROLLNAME = 1.

ENDLOOP.

LOOP AT IT_LTR2_STR_TABLE_STRUCTURE INTO WA_LTR2_STR_TABLE_STRUCTURE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LTR2_STR_TABLE_STRUCTURE-DOMNAME, sy-vline,
  WA_LTR2_STR_TABLE_STRUCTURE-DATATYPE, sy-vline,
  WA_LTR2_STR_TABLE_STRUCTURE-INTLEN, sy-vline,
  WA_LTR2_STR_TABLE_STRUCTURE-OUTPUTLEN, sy-vline,
  WA_LTR2_STR_TABLE_STRUCTURE-INTTYPE, sy-vline,
  WA_LTR2_STR_TABLE_STRUCTURE-DDLENG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LTR2_STR_TABLE_STRUCTURE 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_LTR2_STR_TABLE_STRUCTURE 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_LTR2_STR_TABLE_STRUCTURE INTO WA_LTR2_STR_TABLE_STRUCTURE.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_LTR2_STR_TABLE_STRUCTURE-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTR2_STR_TABLE_STRUCTURE-DATATYPE.
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_LTR2_STR_TABLE_STRUCTURE_STR, 
_LINK_SEL TYPE STRING,
_LINK_TRULE_TABLE TYPE STRING,
FIELDNAME TYPE STRING,
IS_KEY TYPE STRING,
ROLLNAME TYPE STRING,
DOMNAME TYPE STRING,
DATATYPE TYPE STRING,
INTLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
INTTYPE TYPE STRING,
DDLENG TYPE STRING,
DECIMALS TYPE STRING,
LOWERCASE TYPE STRING,
CONVEXIT TYPE STRING,
REFFIELD TYPE STRING,
REFTABLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LTR2_STR_TABLE_STRUCTURE_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_LTR2_STR_TABLE_STRUCTURE_STR-_LINK_SEL sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-_LINK_TRULE_TABLE sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-FIELDNAME sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-IS_KEY sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-ROLLNAME sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-DOMNAME sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-DATATYPE sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-INTLEN sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-OUTPUTLEN sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-INTTYPE sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-DDLENG sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-DECIMALS sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-LOWERCASE sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-CONVEXIT sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-REFFIELD sy-vline 
WA_LTR2_STR_TABLE_STRUCTURE_STR-REFTABLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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