ABAP Select data from SAP table ISUEXT_MAINTAIN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISUEXT_MAINTAIN
*  INTO TABLE @DATA(IT_ISUEXT_MAINTAIN2).
*--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_ISUEXT_MAINTAIN INDEX 1 INTO DATA(WA_ISUEXT_MAINTAIN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISUEXT_MAINTAIN>-DATA = 1.
<ISUEXT_MAINTAIN>-CLIENT = 1.
<ISUEXT_MAINTAIN>-PRODUCT_GUID = 1.
<ISUEXT_MAINTAIN>-VALID_FROM = 1.
<ISUEXT_MAINTAIN>-VALID_TO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISUEXT_MAINTAIN-UPNAME, sy-vline,
  WA_ISUEXT_MAINTAIN-HISTEX, sy-vline,
  WA_ISUEXT_MAINTAIN-LOGSYS, sy-vline,
  WA_ISUEXT_MAINTAIN-ISUCONTR, sy-vline,
  WA_ISUEXT_MAINTAIN-ISULOGSYS, sy-vline,
  WA_ISUEXT_MAINTAIN-NEXTITEM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISUEXT_MAINTAIN 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_ISUEXT_MAINTAIN 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_ISUEXT_MAINTAIN INTO WA_ISUEXT_MAINTAIN.


*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 TSTPS, internal->external for field VALID_FROM
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_ISUEXT_MAINTAIN-VALID_FROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISUEXT_MAINTAIN-VALID_FROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTPS, internal->external for field VALID_TO
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_ISUEXT_MAINTAIN-VALID_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISUEXT_MAINTAIN-VALID_TO.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field BPNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISUEXT_MAINTAIN-BPNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISUEXT_MAINTAIN-BPNO.
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_ISUEXT_MAINTAIN_STR, 
DATA TYPE STRING,
CLIENT TYPE STRING,
PRODUCT_GUID TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
UPNAME TYPE STRING,
HISTEX TYPE STRING,
LOGSYS TYPE STRING,
ISUCONTR TYPE STRING,
ISULOGSYS TYPE STRING,
NEXTITEM TYPE STRING,
RELPREV TYPE STRING,
PREVITEM TYPE STRING,
RELNEXT TYPE STRING,
RELITEM TYPE STRING,
BPNO TYPE STRING,
BPGUID TYPE STRING,
BUAGGUID TYPE STRING,
PODGUID TYPE STRING,
CONTSTART TYPE STRING,
CONTEND TYPE STRING,
CONTDUR TYPE STRING,
VALIDFROM TYPE STRING,
VALIDTO TYPE STRING,
QUOTATION TYPE STRING,
CANCELLED TYPE STRING,
BLOCKED TYPE STRING,
DIVISION TYPE STRING,
CANDI TYPE STRING,
DATA_X TYPE STRING,
ISUCONTR TYPE STRING,
ISULOGSYS TYPE STRING,
NEXTITEM TYPE STRING,
RELPREV TYPE STRING,
PREVITEM TYPE STRING,
RELNEXT TYPE STRING,
RELITEM TYPE STRING,
BPNO TYPE STRING,
BPGUID TYPE STRING,
BUAGGUID TYPE STRING,
PODGUID TYPE STRING,
CONTSTART TYPE STRING,
CONTEND TYPE STRING,
CONTDUR TYPE STRING,
VALIDFROM TYPE STRING,
VALIDTO TYPE STRING,
QUOTATION TYPE STRING,
CANCELLED TYPE STRING,
BLOCKED TYPE STRING,
DIVISION TYPE STRING,
UPDATE_TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISUEXT_MAINTAIN_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_ISUEXT_MAINTAIN_STR-DATA sy-vline 
WA_ISUEXT_MAINTAIN_STR-CLIENT sy-vline 
WA_ISUEXT_MAINTAIN_STR-PRODUCT_GUID sy-vline 
WA_ISUEXT_MAINTAIN_STR-VALID_FROM sy-vline 
WA_ISUEXT_MAINTAIN_STR-VALID_TO sy-vline 
WA_ISUEXT_MAINTAIN_STR-UPNAME sy-vline 
WA_ISUEXT_MAINTAIN_STR-HISTEX sy-vline 
WA_ISUEXT_MAINTAIN_STR-LOGSYS sy-vline 
WA_ISUEXT_MAINTAIN_STR-ISUCONTR sy-vline 
WA_ISUEXT_MAINTAIN_STR-ISULOGSYS sy-vline 
WA_ISUEXT_MAINTAIN_STR-NEXTITEM sy-vline 
WA_ISUEXT_MAINTAIN_STR-RELPREV sy-vline 
WA_ISUEXT_MAINTAIN_STR-PREVITEM sy-vline 
WA_ISUEXT_MAINTAIN_STR-RELNEXT sy-vline 
WA_ISUEXT_MAINTAIN_STR-RELITEM sy-vline 
WA_ISUEXT_MAINTAIN_STR-BPNO sy-vline 
WA_ISUEXT_MAINTAIN_STR-BPGUID sy-vline 
WA_ISUEXT_MAINTAIN_STR-BUAGGUID sy-vline 
WA_ISUEXT_MAINTAIN_STR-PODGUID sy-vline 
WA_ISUEXT_MAINTAIN_STR-CONTSTART sy-vline 
WA_ISUEXT_MAINTAIN_STR-CONTEND sy-vline 
WA_ISUEXT_MAINTAIN_STR-CONTDUR sy-vline 
WA_ISUEXT_MAINTAIN_STR-VALIDFROM sy-vline 
WA_ISUEXT_MAINTAIN_STR-VALIDTO sy-vline 
WA_ISUEXT_MAINTAIN_STR-QUOTATION sy-vline 
WA_ISUEXT_MAINTAIN_STR-CANCELLED sy-vline 
WA_ISUEXT_MAINTAIN_STR-BLOCKED sy-vline 
WA_ISUEXT_MAINTAIN_STR-DIVISION sy-vline 
WA_ISUEXT_MAINTAIN_STR-CANDI sy-vline 
WA_ISUEXT_MAINTAIN_STR-DATA_X sy-vline 
WA_ISUEXT_MAINTAIN_STR-ISUCONTR sy-vline 
WA_ISUEXT_MAINTAIN_STR-ISULOGSYS sy-vline 
WA_ISUEXT_MAINTAIN_STR-NEXTITEM sy-vline 
WA_ISUEXT_MAINTAIN_STR-RELPREV sy-vline 
WA_ISUEXT_MAINTAIN_STR-PREVITEM sy-vline 
WA_ISUEXT_MAINTAIN_STR-RELNEXT sy-vline 
WA_ISUEXT_MAINTAIN_STR-RELITEM sy-vline 
WA_ISUEXT_MAINTAIN_STR-BPNO sy-vline 
WA_ISUEXT_MAINTAIN_STR-BPGUID sy-vline 
WA_ISUEXT_MAINTAIN_STR-BUAGGUID sy-vline 
WA_ISUEXT_MAINTAIN_STR-PODGUID sy-vline 
WA_ISUEXT_MAINTAIN_STR-CONTSTART sy-vline 
WA_ISUEXT_MAINTAIN_STR-CONTEND sy-vline 
WA_ISUEXT_MAINTAIN_STR-CONTDUR sy-vline 
WA_ISUEXT_MAINTAIN_STR-VALIDFROM sy-vline 
WA_ISUEXT_MAINTAIN_STR-VALIDTO sy-vline 
WA_ISUEXT_MAINTAIN_STR-QUOTATION sy-vline 
WA_ISUEXT_MAINTAIN_STR-CANCELLED sy-vline 
WA_ISUEXT_MAINTAIN_STR-BLOCKED sy-vline 
WA_ISUEXT_MAINTAIN_STR-DIVISION sy-vline 
WA_ISUEXT_MAINTAIN_STR-UPDATE_TYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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