ABAP Select data from SAP table T7CL34 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T7CL34 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 T7CL34. 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 T7CL34 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_T7CL34 TYPE STANDARD TABLE OF T7CL34,
      WA_T7CL34 TYPE T7CL34,
      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: <T7CL34> TYPE T7CL34.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T7CL34.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T7CL34
  INTO TABLE IT_T7CL34.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T7CL34
*  INTO TABLE @DATA(IT_T7CL342).
*--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_T7CL34 INDEX 1 INTO DATA(WA_T7CL342).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T7CL34 ASSIGNING <T7CL34>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T7CL34>-MANDT = 1.
<T7CL34>-PAYGR = 1.
<T7CL34>-PFREQ = 1.
<T7CL34>-PYPER = 1.
<T7CL34>-PYYEA = 1.

ENDLOOP.

LOOP AT IT_T7CL34 INTO WA_T7CL34.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T7CL34-ENDDA, sy-vline,
  WA_T7CL34-BEGDA, sy-vline,
  WA_T7CL34-BEGRL, sy-vline,
  WA_T7CL34-ENDRL, sy-vline,
  WA_T7CL34-LGBON, sy-vline,
  WA_T7CL34-LGCTA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T7CL34 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_T7CL34 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_T7CL34 INTO WA_T7CL34.


*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_T7CL34_STR, 
MANDT TYPE STRING,
PAYGR TYPE STRING,
PFREQ TYPE STRING,
PYPER TYPE STRING,
PYYEA TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
BEGRL TYPE STRING,
ENDRL TYPE STRING,
LGBON TYPE STRING,
LGCTA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T7CL34_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_T7CL34_STR-MANDT sy-vline 
WA_T7CL34_STR-PAYGR sy-vline 
WA_T7CL34_STR-PFREQ sy-vline 
WA_T7CL34_STR-PYPER sy-vline 
WA_T7CL34_STR-PYYEA sy-vline 
WA_T7CL34_STR-ENDDA sy-vline 
WA_T7CL34_STR-BEGDA sy-vline 
WA_T7CL34_STR-BEGRL sy-vline 
WA_T7CL34_STR-ENDRL sy-vline 
WA_T7CL34_STR-LGBON sy-vline 
WA_T7CL34_STR-LGCTA sy-vline      INTO ld_text SEPARATED BY SPACE.

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