ABAP Select data from SAP table YIT_O2DOC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP YIT_O2DOC 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 YIT_O2DOC. 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 YIT_O2DOC 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_YIT_O2DOC TYPE STANDARD TABLE OF YIT_O2DOC,
      WA_YIT_O2DOC TYPE YIT_O2DOC,
      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: <YIT_O2DOC> TYPE YIT_O2DOC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_YIT_O2DOC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM YIT_O2DOC
  INTO TABLE IT_YIT_O2DOC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM YIT_O2DOC
*  INTO TABLE @DATA(IT_YIT_O2DOC2).
*--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_YIT_O2DOC INDEX 1 INTO DATA(WA_YIT_O2DOC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_YIT_O2DOC ASSIGNING <YIT_O2DOC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<YIT_O2DOC>-KEY_EXT1 = 1.
<YIT_O2DOC>-KEY_EXT2 = 1.
<YIT_O2DOC>-KEY_EXT3 = 1.
<YIT_O2DOC>-UCLNT = 1.
<YIT_O2DOC>-DAT_UNAME = 1.

ENDLOOP.

LOOP AT IT_YIT_O2DOC INTO WA_YIT_O2DOC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_YIT_O2DOC-DAT_SAPR3, sy-vline,
  WA_YIT_O2DOC-DAT_SAPAPO, sy-vline,
  WA_YIT_O2DOC-DAT_SAPBW, sy-vline,
  WA_YIT_O2DOC-DAT_SAPSEM, sy-vline,
  WA_YIT_O2DOC-DAT_SAPCRM, sy-vline,
  WA_YIT_O2DOC-FLG_1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_YIT_O2DOC 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_YIT_O2DOC 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_YIT_O2DOC INTO WA_YIT_O2DOC.


*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 KEY_EXT3
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_YIT_O2DOC-KEY_EXT3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_YIT_O2DOC-KEY_EXT3.
WRITE:/ 'New Value:', ld_input.

*Conversion exit YISTA, internal->external for field STA_1
CALL FUNCTION 'CONVERSION_EXIT_YISTA_OUTPUT'
  EXPORTING
    input =                      WA_YIT_O2DOC-STA_1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_YIT_O2DOC-STA_1.
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_YIT_O2DOC_STR, 
KEY_EXT1 TYPE STRING,
KEY_EXT2 TYPE STRING,
KEY_EXT3 TYPE STRING,
UCLNT TYPE STRING,
DAT_UNAME TYPE STRING,
DAT_SAPR3 TYPE STRING,
DAT_SAPAPO TYPE STRING,
DAT_SAPBW TYPE STRING,
DAT_SAPSEM TYPE STRING,
DAT_SAPCRM TYPE STRING,
FLG_1 TYPE STRING,
FLG_2 TYPE STRING,
FLG_3 TYPE STRING,
FLG_4 TYPE STRING,
FLG_5 TYPE STRING,
FLG_6 TYPE STRING,
FLG_7 TYPE STRING,
FLG_8 TYPE STRING,
FLG_9 TYPE STRING,
FLG_A TYPE STRING,
FLG_B TYPE STRING,
FLG_C TYPE STRING,
FLG_D TYPE STRING,
FLG_E TYPE STRING,
FLG_F TYPE STRING,
N05_1 TYPE STRING,
N05_2 TYPE STRING,
N10_1 TYPE STRING,
N10_2 TYPE STRING,
C10_1 TYPE STRING,
C10_2 TYPE STRING,
C20_1 TYPE STRING,
C20_2 TYPE STRING,
C20_3 TYPE STRING,
C20_4 TYPE STRING,
C40_1 TYPE STRING,
CAT_1 TYPE STRING,
USR_1 TYPE STRING,
STA_1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_YIT_O2DOC_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_YIT_O2DOC_STR-KEY_EXT1 sy-vline 
WA_YIT_O2DOC_STR-KEY_EXT2 sy-vline 
WA_YIT_O2DOC_STR-KEY_EXT3 sy-vline 
WA_YIT_O2DOC_STR-UCLNT sy-vline 
WA_YIT_O2DOC_STR-DAT_UNAME sy-vline 
WA_YIT_O2DOC_STR-DAT_SAPR3 sy-vline 
WA_YIT_O2DOC_STR-DAT_SAPAPO sy-vline 
WA_YIT_O2DOC_STR-DAT_SAPBW sy-vline 
WA_YIT_O2DOC_STR-DAT_SAPSEM sy-vline 
WA_YIT_O2DOC_STR-DAT_SAPCRM sy-vline 
WA_YIT_O2DOC_STR-FLG_1 sy-vline 
WA_YIT_O2DOC_STR-FLG_2 sy-vline 
WA_YIT_O2DOC_STR-FLG_3 sy-vline 
WA_YIT_O2DOC_STR-FLG_4 sy-vline 
WA_YIT_O2DOC_STR-FLG_5 sy-vline 
WA_YIT_O2DOC_STR-FLG_6 sy-vline 
WA_YIT_O2DOC_STR-FLG_7 sy-vline 
WA_YIT_O2DOC_STR-FLG_8 sy-vline 
WA_YIT_O2DOC_STR-FLG_9 sy-vline 
WA_YIT_O2DOC_STR-FLG_A sy-vline 
WA_YIT_O2DOC_STR-FLG_B sy-vline 
WA_YIT_O2DOC_STR-FLG_C sy-vline 
WA_YIT_O2DOC_STR-FLG_D sy-vline 
WA_YIT_O2DOC_STR-FLG_E sy-vline 
WA_YIT_O2DOC_STR-FLG_F sy-vline 
WA_YIT_O2DOC_STR-N05_1 sy-vline 
WA_YIT_O2DOC_STR-N05_2 sy-vline 
WA_YIT_O2DOC_STR-N10_1 sy-vline 
WA_YIT_O2DOC_STR-N10_2 sy-vline 
WA_YIT_O2DOC_STR-C10_1 sy-vline 
WA_YIT_O2DOC_STR-C10_2 sy-vline 
WA_YIT_O2DOC_STR-C20_1 sy-vline 
WA_YIT_O2DOC_STR-C20_2 sy-vline 
WA_YIT_O2DOC_STR-C20_3 sy-vline 
WA_YIT_O2DOC_STR-C20_4 sy-vline 
WA_YIT_O2DOC_STR-C40_1 sy-vline 
WA_YIT_O2DOC_STR-CAT_1 sy-vline 
WA_YIT_O2DOC_STR-USR_1 sy-vline 
WA_YIT_O2DOC_STR-STA_1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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