ABAP Select data from SAP table EREC_S_API_DOCUMENT_HISTORY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EREC_S_API_DOCUMENT_HISTORY
*  INTO TABLE @DATA(IT_EREC_S_API_DOCUMENT_HISTORY2).
*--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_EREC_S_API_DOCUMENT_HISTORY INDEX 1 INTO DATA(WA_EREC_S_API_DOCUMENT_HISTORY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EREC_S_API_DOCUMENT_HISTORY>-ACT_TYPE = 1.
<EREC_S_API_DOCUMENT_HISTORY>-ACT_GUID = 1.
<EREC_S_API_DOCUMENT_HISTORY>-STATUS = 1.
<EREC_S_API_DOCUMENT_HISTORY>-DUE_DATE = 1.
<EREC_S_API_DOCUMENT_HISTORY>-RES_SCLAS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EREC_S_API_DOCUMENT_HISTORY-RES_SOBID, sy-vline,
  WA_EREC_S_API_DOCUMENT_HISTORY-NOTE, sy-vline,
  WA_EREC_S_API_DOCUMENT_HISTORY-ACT_CAT, sy-vline,
  WA_EREC_S_API_DOCUMENT_HISTORY-DATE_EXECUTED, sy-vline,
  WA_EREC_S_API_DOCUMENT_HISTORY-EXECUTER, sy-vline,
  WA_EREC_S_API_DOCUMENT_HISTORY-ACT_PROC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EREC_S_API_DOCUMENT_HISTORY 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_EREC_S_API_DOCUMENT_HISTORY 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_EREC_S_API_DOCUMENT_HISTORY INTO WA_EREC_S_API_DOCUMENT_HISTORY.


*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_EREC_S_API_DOCUMENT_HISTORY_STR, 
ACT_TYPE TYPE STRING,
ACT_GUID TYPE STRING,
STATUS TYPE STRING,
DUE_DATE TYPE STRING,
RES_SCLAS TYPE STRING,
RES_SOBID TYPE STRING,
NOTE TYPE STRING,
ACT_CAT TYPE STRING,
DATE_EXECUTED TYPE STRING,
EXECUTER TYPE STRING,
ACT_PROC TYPE STRING,
QA_TPL_OBJID TYPE STRING,
QA_DOC_GUID TYPE STRING,
QA_VISIBLE TYPE STRING,
ACT_TYPE_TXT TYPE STRING,
STATUS_TXT TYPE STRING,
ACT_CAT_TXT TYPE STRING,
RES_NAME TYPE STRING,
ACT_PROC_TXT TYPE STRING,
EXECUTER_NAME TYPE STRING,
ACT_PROC_SEQ_NR TYPE STRING,
CDCY_HROBJECT TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
CDCY_CREATE_DATE TYPE STRING,
CDCY_STATUS TYPE STRING,
CDCY_STATUS_TXT TYPE STRING,
REQ_HEADER TYPE STRING,
REQ_HROBJECT TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
CAND_NAME TYPE STRING,
CAND_HROBJECT TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
APPL_HROBJECT TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
APPL_DATE TYPE STRING,
IS_EMPLOYEE TYPE STRING,
EMPLOYEEID TYPE STRING,
IS_APPLICATION TYPE STRING,
IS_ORIG_CDCY TYPE STRING,
QA_TPL_TITLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EREC_S_API_DOCUMENT_HISTORY_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_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_TYPE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_GUID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-STATUS sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-DUE_DATE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-RES_SCLAS sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-RES_SOBID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-NOTE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_CAT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-DATE_EXECUTED sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-EXECUTER sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_PROC sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-QA_TPL_OBJID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-QA_DOC_GUID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-QA_VISIBLE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_TYPE_TXT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-STATUS_TXT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_CAT_TXT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-RES_NAME sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_PROC_TXT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-EXECUTER_NAME sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-ACT_PROC_SEQ_NR sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-CDCY_HROBJECT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-PLVAR sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OTYPE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OBJID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-CDCY_CREATE_DATE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-CDCY_STATUS sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-CDCY_STATUS_TXT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-REQ_HEADER sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-REQ_HROBJECT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-PLVAR sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OTYPE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OBJID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-CAND_NAME sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-CAND_HROBJECT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-PLVAR sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OTYPE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OBJID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-APPL_HROBJECT sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-PLVAR sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OTYPE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-OBJID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-APPL_DATE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-IS_EMPLOYEE sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-EMPLOYEEID sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-IS_APPLICATION sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-IS_ORIG_CDCY sy-vline 
WA_EREC_S_API_DOCUMENT_HISTORY_STR-QA_TPL_TITLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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