ABAP Select data from SAP table ALV_T_T2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ALV_T_T2 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 ALV_T_T2. 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 ALV_T_T2 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_ALV_T_T2 TYPE STANDARD TABLE OF ALV_T_T2,
      WA_ALV_T_T2 TYPE ALV_T_T2,
      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: <ALV_T_T2> TYPE ALV_T_T2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ALV_T_T2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ALV_T_T2
  INTO TABLE IT_ALV_T_T2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALV_T_T2
*  INTO TABLE @DATA(IT_ALV_T_T22).
*--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_ALV_T_T2 INDEX 1 INTO DATA(WA_ALV_T_T22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ALV_T_T2 ASSIGNING <ALV_T_T2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALV_T_T2>-MANDT = 1.
<ALV_T_T2>-CARRID = 1.
<ALV_T_T2>-CONNID = 1.
<ALV_T_T2>-FLDATE = 1.
<ALV_T_T2>-CARRNAME = 1.

ENDLOOP.

LOOP AT IT_ALV_T_T2 INTO WA_ALV_T_T2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALV_T_T2-CARRID_CONV, sy-vline,
  WA_ALV_T_T2-PRICE, sy-vline,
  WA_ALV_T_T2-CURRENCY, sy-vline,
  WA_ALV_T_T2-PLANETYPE, sy-vline,
  WA_ALV_T_T2-SEATSMAX, sy-vline,
  WA_ALV_T_T2-SEATSOCC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALV_T_T2 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_ALV_T_T2 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_ALV_T_T2 INTO WA_ALV_T_T2.


*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 ALV2, internal->external for field CARRID_CONV
CALL FUNCTION 'CONVERSION_EXIT_ALV2_OUTPUT'
  EXPORTING
    input =                      WA_ALV_T_T2-CARRID_CONV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ALV_T_T2-CARRID_CONV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SDURA, internal->external for field FLTIME
CALL FUNCTION 'CONVERSION_EXIT_SDURA_OUTPUT'
  EXPORTING
    input =                      WA_ALV_T_T2-FLTIME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ALV_T_T2-FLTIME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DISTID
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ALV_T_T2-DISTID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ALV_T_T2-DISTID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALV3, internal->external for field CONV_INT
CALL FUNCTION 'CONVERSION_EXIT_ALV3_OUTPUT'
  EXPORTING
    input =                      WA_ALV_T_T2-CONV_INT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ALV_T_T2-CONV_INT.
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_ALV_T_T2_STR, 
MANDT TYPE STRING,
CARRID TYPE STRING,
CONNID TYPE STRING,
FLDATE TYPE STRING,
CARRNAME TYPE STRING,
CARRID_CONV TYPE STRING,
PRICE TYPE STRING,
CURRENCY TYPE STRING,
PLANETYPE TYPE STRING,
SEATSMAX TYPE STRING,
SEATSOCC TYPE STRING,
PAYMENTSUM TYPE STRING,
COUNTRYFR TYPE STRING,
AIRPFROM TYPE STRING,
COUNTRYTO TYPE STRING,
AIRPTO TYPE STRING,
FLTIME TYPE STRING,
DEPTIME TYPE STRING,
ARRTIME TYPE STRING,
DISTANCE TYPE STRING,
DISTID TYPE STRING,
PERIOD TYPE STRING,
FLOAT_FI TYPE STRING,
STRING_F TYPE STRING,
XSTRING TYPE STRING,
INT_FIEL TYPE STRING,
HEX_FIEL TYPE STRING,
DROPDOWN TYPE STRING,
TAB_INDEX TYPE STRING,
TIMESTAMP_S TYPE STRING,
TIMESTAMP_L TYPE STRING,
TIME TYPE STRING,
CONV_INT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALV_T_T2_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_ALV_T_T2_STR-MANDT sy-vline 
WA_ALV_T_T2_STR-CARRID sy-vline 
WA_ALV_T_T2_STR-CONNID sy-vline 
WA_ALV_T_T2_STR-FLDATE sy-vline 
WA_ALV_T_T2_STR-CARRNAME sy-vline 
WA_ALV_T_T2_STR-CARRID_CONV sy-vline 
WA_ALV_T_T2_STR-PRICE sy-vline 
WA_ALV_T_T2_STR-CURRENCY sy-vline 
WA_ALV_T_T2_STR-PLANETYPE sy-vline 
WA_ALV_T_T2_STR-SEATSMAX sy-vline 
WA_ALV_T_T2_STR-SEATSOCC sy-vline 
WA_ALV_T_T2_STR-PAYMENTSUM sy-vline 
WA_ALV_T_T2_STR-COUNTRYFR sy-vline 
WA_ALV_T_T2_STR-AIRPFROM sy-vline 
WA_ALV_T_T2_STR-COUNTRYTO sy-vline 
WA_ALV_T_T2_STR-AIRPTO sy-vline 
WA_ALV_T_T2_STR-FLTIME sy-vline 
WA_ALV_T_T2_STR-DEPTIME sy-vline 
WA_ALV_T_T2_STR-ARRTIME sy-vline 
WA_ALV_T_T2_STR-DISTANCE sy-vline 
WA_ALV_T_T2_STR-DISTID sy-vline 
WA_ALV_T_T2_STR-PERIOD sy-vline 
WA_ALV_T_T2_STR-FLOAT_FI sy-vline 
WA_ALV_T_T2_STR-STRING_F sy-vline 
WA_ALV_T_T2_STR-XSTRING sy-vline 
WA_ALV_T_T2_STR-INT_FIEL sy-vline 
WA_ALV_T_T2_STR-HEX_FIEL sy-vline 
WA_ALV_T_T2_STR-DROPDOWN sy-vline 
WA_ALV_T_T2_STR-TAB_INDEX sy-vline 
WA_ALV_T_T2_STR-TIMESTAMP_S sy-vline 
WA_ALV_T_T2_STR-TIMESTAMP_L sy-vline 
WA_ALV_T_T2_STR-TIME sy-vline 
WA_ALV_T_T2_STR-CONV_INT sy-vline      INTO ld_text SEPARATED BY SPACE.

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