ABAP Dynamic Tables

•  Reading Dynamic Table

REPORT z_dynamic_read.

DATA: gt_itab TYPE REF TO data,
      ge_key_field1 TYPE char30,
      ge_key_field2 TYPE char30,
      ge_key_field3 TYPE char30,
      go_descr_ref TYPE REF TO cl_abap_tabledescr.

FIELD-SYMBOLS: <gt_itab> TYPE STANDARD TABLE,
               <gs_key_comp> TYPE abap_keydescr,
               <gs_result> TYPE ANY.

PARAMETERS: pa_table TYPE tabname16 DEFAULT 'SPFLI',
            pa_cond1 TYPE string DEFAULT sy-mandt,
            pa_cond2 TYPE string DEFAULT 'LH',
            pa_cond3 TYPE string DEFAULT '0123'.

START-OF-SELECTION.

* Create and populate internal table
  CREATE DATA gt_itab TYPE STANDARD TABLE OF (pa_table).
  ASSIGN gt_itab->* TO <gt_itab>.
  SELECT * FROM (pa_table) INTO TABLE <gt_itab>.

* Get the key components into the fields ge_key_field1, ...
  go_descr_ref ?= cl_abap_typedescr=>describe_by_data_ref( gt_itab ).
  LOOP AT go_descr_ref->key ASSIGNING <gs_key_comp>.
    CASE sy-tabix.
      WHEN 1.
        ge_key_field1 = <gs_key_comp>-name.
      WHEN 2.
        ge_key_field2 = <gs_key_comp>-name.
      WHEN 3.
        ge_key_field3 = <gs_key_comp>-name.
    ENDCASE.
  ENDLOOP.

* Finally, perform the search
  READ TABLE <gt_itab> ASSIGNING <gs_result>
          WITH KEY (ge_key_field1) = pa_cond1
                   (ge_key_field2) = pa_cond2
                   (ge_key_field3) = pa_cond3.
  IF sy-subrc = 0.
    WRITE / 'Record found.'.
  ELSE.
    WRITE / 'No record found.'.
  ENDIF.

One note: When an internal table is created dynamically like in my program above, 

the table key isnot the key defined in the DDIC structure — instead, the default key 

for the standard table is used (i.e. all non-numeric fields).