ABAP Select data from SAP table /BDL/MAINTAIN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /BDL/MAINTAIN 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 /BDL/MAINTAIN. 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 /BDL/MAINTAIN 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_/BDL/MAINTAIN TYPE STANDARD TABLE OF /BDL/MAINTAIN,
      WA_/BDL/MAINTAIN TYPE /BDL/MAINTAIN,
      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: </BDL/MAINTAIN> TYPE /BDL/MAINTAIN.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /BDL/MAINTAIN
  INTO TABLE IT_/BDL/MAINTAIN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /BDL/MAINTAIN
*  INTO TABLE @DATA(IT_/BDL/MAINTAIN2).
*--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_/BDL/MAINTAIN INDEX 1 INTO DATA(WA_/BDL/MAINTAIN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/BDL/MAINTAIN ASSIGNING </BDL/MAINTAIN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</BDL/MAINTAIN>-ID = 1.
</BDL/MAINTAIN>-TASKNAME = 1.
</BDL/MAINTAIN>-REQ_DEST = 1.
</BDL/MAINTAIN>-PERIOD = 1.
</BDL/MAINTAIN>-PERVALUE = 1.

ENDLOOP.

LOOP AT IT_/BDL/MAINTAIN INTO WA_/BDL/MAINTAIN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/BDL/MAINTAIN-DAYSAHEAD, sy-vline,
  WA_/BDL/MAINTAIN-DAYSBACK, sy-vline,
  WA_/BDL/MAINTAIN-DEL_LOG, sy-vline,
  WA_/BDL/MAINTAIN-LOG_BACK, sy-vline,
  WA_/BDL/MAINTAIN-DEL_SESS, sy-vline,
  WA_/BDL/MAINTAIN-SESS_BACK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/BDL/MAINTAIN 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_/BDL/MAINTAIN 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_/BDL/MAINTAIN INTO WA_/BDL/MAINTAIN.


*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_/BDL/MAINTAIN_STR, 
ID TYPE STRING,
TASKNAME TYPE STRING,
REQ_DEST TYPE STRING,
PERIOD TYPE STRING,
PERVALUE TYPE STRING,
DAYSAHEAD TYPE STRING,
DAYSBACK TYPE STRING,
DEL_LOG TYPE STRING,
LOG_BACK TYPE STRING,
DEL_SESS TYPE STRING,
SESS_BACK TYPE STRING,
DELAY_UNIT TYPE STRING,
DELAY_VALUE TYPE STRING,
RETRY TYPE STRING,
PERIOD_SESS TYPE STRING,
PERUNIT_SESS TYPE STRING,
PERIOD_DEF TYPE STRING,
PERUNIT_DEF TYPE STRING,
STEP_DEF TYPE STRING,
PERIOD_DEL TYPE STRING,
PERUNIT_DEL TYPE STRING,
PERIOD_LIC TYPE STRING,
PERUNIT_LIC TYPE STRING,
FORCE TYPE STRING,
UNAME TYPE STRING,
CREATED TYPE STRING,
CHANGED TYPE STRING,
PERIOD_CERT TYPE STRING,
PERUNIT_CERT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/BDL/MAINTAIN_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_/BDL/MAINTAIN_STR-ID sy-vline 
WA_/BDL/MAINTAIN_STR-TASKNAME sy-vline 
WA_/BDL/MAINTAIN_STR-REQ_DEST sy-vline 
WA_/BDL/MAINTAIN_STR-PERIOD sy-vline 
WA_/BDL/MAINTAIN_STR-PERVALUE sy-vline 
WA_/BDL/MAINTAIN_STR-DAYSAHEAD sy-vline 
WA_/BDL/MAINTAIN_STR-DAYSBACK sy-vline 
WA_/BDL/MAINTAIN_STR-DEL_LOG sy-vline 
WA_/BDL/MAINTAIN_STR-LOG_BACK sy-vline 
WA_/BDL/MAINTAIN_STR-DEL_SESS sy-vline 
WA_/BDL/MAINTAIN_STR-SESS_BACK sy-vline 
WA_/BDL/MAINTAIN_STR-DELAY_UNIT sy-vline 
WA_/BDL/MAINTAIN_STR-DELAY_VALUE sy-vline 
WA_/BDL/MAINTAIN_STR-RETRY sy-vline 
WA_/BDL/MAINTAIN_STR-PERIOD_SESS sy-vline 
WA_/BDL/MAINTAIN_STR-PERUNIT_SESS sy-vline 
WA_/BDL/MAINTAIN_STR-PERIOD_DEF sy-vline 
WA_/BDL/MAINTAIN_STR-PERUNIT_DEF sy-vline 
WA_/BDL/MAINTAIN_STR-STEP_DEF sy-vline 
WA_/BDL/MAINTAIN_STR-PERIOD_DEL sy-vline 
WA_/BDL/MAINTAIN_STR-PERUNIT_DEL sy-vline 
WA_/BDL/MAINTAIN_STR-PERIOD_LIC sy-vline 
WA_/BDL/MAINTAIN_STR-PERUNIT_LIC sy-vline 
WA_/BDL/MAINTAIN_STR-FORCE sy-vline 
WA_/BDL/MAINTAIN_STR-UNAME sy-vline 
WA_/BDL/MAINTAIN_STR-CREATED sy-vline 
WA_/BDL/MAINTAIN_STR-CHANGED sy-vline 
WA_/BDL/MAINTAIN_STR-PERIOD_CERT sy-vline 
WA_/BDL/MAINTAIN_STR-PERUNIT_CERT sy-vline      INTO ld_text SEPARATED BY SPACE.

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