ABAP Select data from SAP table TST04IOL64 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TST04IOL64 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 TST04IOL64. 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 TST04IOL64 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_TST04IOL64 TYPE STANDARD TABLE OF TST04IOL64,
      WA_TST04IOL64 TYPE TST04IOL64,
      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: <TST04IOL64> TYPE TST04IOL64.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TST04IOL64.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TST04IOL64
  INTO TABLE IT_TST04IOL64.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TST04IOL64
*  INTO TABLE @DATA(IT_TST04IOL642).
*--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_TST04IOL64 INDEX 1 INTO DATA(WA_TST04IOL642).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TST04IOL64 ASSIGNING <TST04IOL64>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TST04IOL64>-CHUNKNUM = 1.
<TST04IOL64>-ISMIRROR = 1.
<TST04IOL64>-DBSNAME = 1.
<TST04IOL64>-CHKSIZE = 1.
<TST04IOL64>-NFREE = 1.

ENDLOOP.

LOOP AT IT_TST04IOL64 INTO WA_TST04IOL64.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TST04IOL64-FNAME, sy-vline,
  WA_TST04IOL64-MFNAME, sy-vline,
  WA_TST04IOL64-READTIME, sy-vline,
  WA_TST04IOL64-WRITETIME, sy-vline,
  WA_TST04IOL64-MREADTIME, sy-vline,
  WA_TST04IOL64-MWRITETIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TST04IOL64 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_TST04IOL64 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_TST04IOL64 INTO WA_TST04IOL64.


*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_TST04IOL64_STR, 
CHUNKNUM TYPE STRING,
ISMIRROR TYPE STRING,
DBSNAME TYPE STRING,
CHKSIZE TYPE STRING,
NFREE TYPE STRING,
FNAME TYPE STRING,
MFNAME TYPE STRING,
READTIME TYPE STRING,
WRITETIME TYPE STRING,
MREADTIME TYPE STRING,
MWRITETIME TYPE STRING,
READS TYPE STRING,
PAGSREAD TYPE STRING,
WRITES TYPE STRING,
PAGSWRIT TYPE STRING,
MREADS TYPE STRING,
MPGSREAD TYPE STRING,
MWRITES TYPE STRING,
MPGSWRIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TST04IOL64_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_TST04IOL64_STR-CHUNKNUM sy-vline 
WA_TST04IOL64_STR-ISMIRROR sy-vline 
WA_TST04IOL64_STR-DBSNAME sy-vline 
WA_TST04IOL64_STR-CHKSIZE sy-vline 
WA_TST04IOL64_STR-NFREE sy-vline 
WA_TST04IOL64_STR-FNAME sy-vline 
WA_TST04IOL64_STR-MFNAME sy-vline 
WA_TST04IOL64_STR-READTIME sy-vline 
WA_TST04IOL64_STR-WRITETIME sy-vline 
WA_TST04IOL64_STR-MREADTIME sy-vline 
WA_TST04IOL64_STR-MWRITETIME sy-vline 
WA_TST04IOL64_STR-READS sy-vline 
WA_TST04IOL64_STR-PAGSREAD sy-vline 
WA_TST04IOL64_STR-WRITES sy-vline 
WA_TST04IOL64_STR-PAGSWRIT sy-vline 
WA_TST04IOL64_STR-MREADS sy-vline 
WA_TST04IOL64_STR-MPGSREAD sy-vline 
WA_TST04IOL64_STR-MWRITES sy-vline 
WA_TST04IOL64_STR-MPGSWRIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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