ABAP Select data from SAP table PTBLCHLOG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PTBLCHLOG
*  INTO TABLE @DATA(IT_PTBLCHLOG2).
*--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_PTBLCHLOG INDEX 1 INTO DATA(WA_PTBLCHLOG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PTBLCHLOG>-TABLECHANGELOGDATE = 1.
<PTBLCHLOG>-TABLECHANGELOGTIME = 1.
<PTBLCHLOG>-TABLECHANGELOG = 1.
<PTBLCHLOG>-TABLECHANGELOGTABLENAME = 1.
<PTBLCHLOG>-TABLECHANGELOGKEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PTBLCHLOG-TABLECHANGELOGUSER, sy-vline,
  WA_PTBLCHLOG-TABLECHANGELOGOPERATION, sy-vline,
  WA_PTBLCHLOG-TABLECHANGELOGVERSION, sy-vline,
  WA_PTBLCHLOG-LANGUAGE, sy-vline,
  WA_PTBLCHLOG-NMBROFCHANGELOGDATACHARACTERS, sy-vline,
  WA_PTBLCHLOG-TABLECHANGELOGVALUE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PTBLCHLOG 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_PTBLCHLOG 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_PTBLCHLOG INTO WA_PTBLCHLOG.


*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 ISOLA, internal->external for field LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_PTBLCHLOG-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PTBLCHLOG-LANGUAGE.
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_PTBLCHLOG_STR, 
TABLECHANGELOGDATE TYPE STRING,
TABLECHANGELOGTIME TYPE STRING,
TABLECHANGELOG TYPE STRING,
TABLECHANGELOGTABLENAME TYPE STRING,
TABLECHANGELOGKEY TYPE STRING,
TABLECHANGELOGUSER TYPE STRING,
TABLECHANGELOGOPERATION TYPE STRING,
TABLECHANGELOGVERSION TYPE STRING,
LANGUAGE TYPE STRING,
NMBROFCHANGELOGDATACHARACTERS TYPE STRING,
TABLECHANGELOGVALUE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PTBLCHLOG_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_PTBLCHLOG_STR-TABLECHANGELOGDATE sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOGTIME sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOG sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOGTABLENAME sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOGKEY sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOGUSER sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOGOPERATION sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOGVERSION sy-vline 
WA_PTBLCHLOG_STR-LANGUAGE sy-vline 
WA_PTBLCHLOG_STR-NMBROFCHANGELOGDATACHARACTERS sy-vline 
WA_PTBLCHLOG_STR-TABLECHANGELOGVALUE sy-vline      INTO ld_text SEPARATED BY SPACE.

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