ABAP Select data from SAP table TNCH52 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNCH52 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 TNCH52. 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 TNCH52 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_TNCH52 TYPE STANDARD TABLE OF TNCH52,
      WA_TNCH52 TYPE TNCH52,
      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: <TNCH52> TYPE TNCH52.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNCH52.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNCH52
  INTO TABLE IT_TNCH52.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNCH52
*  INTO TABLE @DATA(IT_TNCH522).
*--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_TNCH52 INDEX 1 INTO DATA(WA_TNCH522).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNCH52 ASSIGNING <TNCH52>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNCH52>-MANDT = 1.
<TNCH52>-EINRI = 1.
<TNCH52>-FALAE = 1.
<TNCH52>-CASETY = 1.
<TNCH52>-TARCDE = 1.

ENDLOOP.

LOOP AT IT_TNCH52 INTO WA_TNCH52.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNCH52-AGREEMENT, sy-vline,
  WA_TNCH52-CLASS, sy-vline,
  WA_TNCH52-KTRART, sy-vline,
  WA_TNCH52-KTR, sy-vline,
  WA_TNCH52-SELBSTKZ, sy-vline,
  WA_TNCH52-UNFKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNCH52 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_TNCH52 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_TNCH52 INTO WA_TNCH52.


*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 ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNCH52-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCH52-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CLASS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNCH52-CLASS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCH52-CLASS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KTRART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNCH52-KTRART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCH52-KTRART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNCH52-KTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCH52-KTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANFOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNCH52-ANFOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCH52-ANFOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ERBOE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNCH52-ERBOE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCH52-ERBOE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ABRV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNCH52-ABRV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNCH52-ABRV.
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_TNCH52_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
FALAE TYPE STRING,
CASETY TYPE STRING,
TARCDE TYPE STRING,
AGREEMENT TYPE STRING,
CLASS TYPE STRING,
KTRART TYPE STRING,
KTR TYPE STRING,
SELBSTKZ TYPE STRING,
UNFKZ TYPE STRING,
ANFOE TYPE STRING,
ERBOE TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
ABRV TYPE STRING,
FBSEXIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNCH52_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_TNCH52_STR-MANDT sy-vline 
WA_TNCH52_STR-EINRI sy-vline 
WA_TNCH52_STR-FALAE sy-vline 
WA_TNCH52_STR-CASETY sy-vline 
WA_TNCH52_STR-TARCDE sy-vline 
WA_TNCH52_STR-AGREEMENT sy-vline 
WA_TNCH52_STR-CLASS sy-vline 
WA_TNCH52_STR-KTRART sy-vline 
WA_TNCH52_STR-KTR sy-vline 
WA_TNCH52_STR-SELBSTKZ sy-vline 
WA_TNCH52_STR-UNFKZ sy-vline 
WA_TNCH52_STR-ANFOE sy-vline 
WA_TNCH52_STR-ERBOE sy-vline 
WA_TNCH52_STR-BEGDT sy-vline 
WA_TNCH52_STR-ENDDT sy-vline 
WA_TNCH52_STR-ABRV sy-vline 
WA_TNCH52_STR-FBSEXIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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