ABAP Select data from SAP table MIHEADER_T into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MIHEADER_T
*  INTO TABLE @DATA(IT_MIHEADER_T2).
*--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_MIHEADER_T INDEX 1 INTO DATA(WA_MIHEADER_T2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MIHEADER_T>-VERSION = 1.
<MIHEADER_T>-SYSID = 1.
<MIHEADER_T>-MANDT = 1.
<MIHEADER_T>-HOST = 1.
<MIHEADER_T>-OPSYS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MIHEADER_T-UNAME, sy-vline,
  WA_MIHEADER_T-REPID, sy-vline,
  WA_MIHEADER_T-TCODE, sy-vline,
  WA_MIHEADER_T-UZEIT, sy-vline,
  WA_MIHEADER_T-DATUM, sy-vline,
  WA_MIHEADER_T-SESSION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MIHEADER_T 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_MIHEADER_T 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_MIHEADER_T INTO WA_MIHEADER_T.


*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_MIHEADER_T_STR, 
VERSION TYPE STRING,
SYSID TYPE STRING,
MANDT TYPE STRING,
HOST TYPE STRING,
OPSYS TYPE STRING,
UNAME TYPE STRING,
REPID TYPE STRING,
TCODE TYPE STRING,
UZEIT TYPE STRING,
DATUM TYPE STRING,
SESSION TYPE STRING,
EMODE TYPE STRING,
IMODE TYPE STRING,
GC_OFF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MIHEADER_T_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_MIHEADER_T_STR-VERSION sy-vline 
WA_MIHEADER_T_STR-SYSID sy-vline 
WA_MIHEADER_T_STR-MANDT sy-vline 
WA_MIHEADER_T_STR-HOST sy-vline 
WA_MIHEADER_T_STR-OPSYS sy-vline 
WA_MIHEADER_T_STR-UNAME sy-vline 
WA_MIHEADER_T_STR-REPID sy-vline 
WA_MIHEADER_T_STR-TCODE sy-vline 
WA_MIHEADER_T_STR-UZEIT sy-vline 
WA_MIHEADER_T_STR-DATUM sy-vline 
WA_MIHEADER_T_STR-SESSION sy-vline 
WA_MIHEADER_T_STR-EMODE sy-vline 
WA_MIHEADER_T_STR-IMODE sy-vline 
WA_MIHEADER_T_STR-GC_OFF sy-vline      INTO ld_text SEPARATED BY SPACE.

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