ABAP Select data from SAP table TEMP_MD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TEMP_MD
*  INTO TABLE @DATA(IT_TEMP_MD2).
*--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_TEMP_MD INDEX 1 INTO DATA(WA_TEMP_MD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TEMP_MD>-MANDT = 1.
<TEMP_MD>-OS_GUID = 1.
<TEMP_MD>-TIMESTAMP = 1.
<TEMP_MD>-GUID = 1.
<TEMP_MD>-SCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TEMP_MD-RKEY1, sy-vline,
  WA_TEMP_MD-RKEY2, sy-vline,
  WA_TEMP_MD-SINSTRUMNT, sy-vline,
  WA_TEMP_MD-DDATE, sy-vline,
  WA_TEMP_MD-TTIME, sy-vline,
  WA_TEMP_MD-VALUE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TEMP_MD 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_TEMP_MD 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_TEMP_MD INTO WA_TEMP_MD.


*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_TEMP_MD_STR, 
MANDT TYPE STRING,
OS_GUID TYPE STRING,
TIMESTAMP TYPE STRING,
GUID TYPE STRING,
SCLASS TYPE STRING,
RKEY1 TYPE STRING,
RKEY2 TYPE STRING,
SINSTRUMNT TYPE STRING,
DDATE TYPE STRING,
TTIME TYPE STRING,
VALUE TYPE STRING,
CURRENCY TYPE STRING,
FFACT TYPE STRING,
TFACT TYPE STRING,
QUOTATION TYPE STRING,
MKIND TYPE STRING,
RZUSATZ TYPE STRING,
SSTATS TYPE STRING,
ERROR TYPE STRING,
ROWINDEX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TEMP_MD_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_TEMP_MD_STR-MANDT sy-vline 
WA_TEMP_MD_STR-OS_GUID sy-vline 
WA_TEMP_MD_STR-TIMESTAMP sy-vline 
WA_TEMP_MD_STR-GUID sy-vline 
WA_TEMP_MD_STR-SCLASS sy-vline 
WA_TEMP_MD_STR-RKEY1 sy-vline 
WA_TEMP_MD_STR-RKEY2 sy-vline 
WA_TEMP_MD_STR-SINSTRUMNT sy-vline 
WA_TEMP_MD_STR-DDATE sy-vline 
WA_TEMP_MD_STR-TTIME sy-vline 
WA_TEMP_MD_STR-VALUE sy-vline 
WA_TEMP_MD_STR-CURRENCY sy-vline 
WA_TEMP_MD_STR-FFACT sy-vline 
WA_TEMP_MD_STR-TFACT sy-vline 
WA_TEMP_MD_STR-QUOTATION sy-vline 
WA_TEMP_MD_STR-MKIND sy-vline 
WA_TEMP_MD_STR-RZUSATZ sy-vline 
WA_TEMP_MD_STR-SSTATS sy-vline 
WA_TEMP_MD_STR-ERROR sy-vline 
WA_TEMP_MD_STR-ROWINDEX sy-vline      INTO ld_text SEPARATED BY SPACE.

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