ABAP Select data from SAP table ESV_TCGA6 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ESV_TCGA6 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 ESV_TCGA6. 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 ESV_TCGA6 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_ESV_TCGA6 TYPE STANDARD TABLE OF ESV_TCGA6,
      WA_ESV_TCGA6 TYPE ESV_TCGA6,
      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: <ESV_TCGA6> TYPE ESV_TCGA6.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ESV_TCGA6.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ESV_TCGA6
  INTO TABLE IT_ESV_TCGA6.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESV_TCGA6
*  INTO TABLE @DATA(IT_ESV_TCGA62).
*--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_ESV_TCGA6 INDEX 1 INTO DATA(WA_ESV_TCGA62).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ESV_TCGA6 ASSIGNING <ESV_TCGA6>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESV_TCGA6>-MANDT = 1.
<ESV_TCGA6>-LSYTYPE = 1.
<ESV_TCGA6>-LSYID = 1.
<ESV_TCGA6>-LSYGRP = 1.
<ESV_TCGA6>-LSYFKPA = 1.

ENDLOOP.

LOOP AT IT_ESV_TCGA6 INTO WA_ESV_TCGA6.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESV_TCGA6-ESTCAT, sy-vline,
  WA_ESV_TCGA6-LSYRTIM, sy-vline,
  WA_ESV_TCGA6-LSYRMOD, sy-vline,
  WA_ESV_TCGA6-LSYRPAR, sy-vline,
  WA_ESV_TCGA6-LSYRVAL, sy-vline,
  WA_ESV_TCGA6-LSYUFLG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESV_TCGA6 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_ESV_TCGA6 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_ESV_TCGA6 INTO WA_ESV_TCGA6.


*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_ESV_TCGA6_STR, 
MANDT TYPE STRING,
LSYTYPE TYPE STRING,
LSYID TYPE STRING,
LSYGRP TYPE STRING,
LSYFKPA TYPE STRING,
ESTCAT TYPE STRING,
LSYRTIM TYPE STRING,
LSYRMOD TYPE STRING,
LSYRPAR TYPE STRING,
LSYRVAL TYPE STRING,
LSYUFLG TYPE STRING,
LSYNAM TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
ATNAM TYPE STRING,
LMSGFLG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESV_TCGA6_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_ESV_TCGA6_STR-MANDT sy-vline 
WA_ESV_TCGA6_STR-LSYTYPE sy-vline 
WA_ESV_TCGA6_STR-LSYID sy-vline 
WA_ESV_TCGA6_STR-LSYGRP sy-vline 
WA_ESV_TCGA6_STR-LSYFKPA sy-vline 
WA_ESV_TCGA6_STR-ESTCAT sy-vline 
WA_ESV_TCGA6_STR-LSYRTIM sy-vline 
WA_ESV_TCGA6_STR-LSYRMOD sy-vline 
WA_ESV_TCGA6_STR-LSYRPAR sy-vline 
WA_ESV_TCGA6_STR-LSYRVAL sy-vline 
WA_ESV_TCGA6_STR-LSYUFLG sy-vline 
WA_ESV_TCGA6_STR-LSYNAM sy-vline 
WA_ESV_TCGA6_STR-TABNAME sy-vline 
WA_ESV_TCGA6_STR-FIELDNAME sy-vline 
WA_ESV_TCGA6_STR-KLART sy-vline 
WA_ESV_TCGA6_STR-CLASS sy-vline 
WA_ESV_TCGA6_STR-ATNAM sy-vline 
WA_ESV_TCGA6_STR-LMSGFLG sy-vline      INTO ld_text SEPARATED BY SPACE.

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