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Dynamic internal tables
Here is how to create a dynamic internal table in a program.
Usage:
* Used when the number of columns / fields are not known at the design time / compile time.
* Performance will not as good as in the Static internal table creation.
The code was written in R/3 Release 4.6C.
TYPE-POOLS: slis.
DATA: it_fcat TYPE slis_t_fieldcat_alv,
is_fcat LIKE LINE OF it_fcat.
DATA: it_fieldcat TYPE lvc_t_fcat,
is_fieldcat LIKE LINE OF it_fieldcat.
DATA: new_table TYPE REF TO data.
DATA: new_line TYPE REF TO data.
FIELD-SYMBOLS: <l_table> TYPE ANY TABLE,
<l_line> TYPE ANY,
<l_field> TYPE ANY.
is_fieldcat-fieldname = 'FIELD1'.
is_fieldcat-ref_field = 'MATNR'.
is_fieldcat-ref_table = 'MARA'.
APPEND is_fieldcat TO it_fieldcat.
is_fieldcat-fieldname = 'FIELD2'.
is_fieldcat-ref_field = 'SPRPS'.
is_fieldcat-ref_table = 'PA0001'.
APPEND is_fieldcat TO it_fieldcat.
is_fieldcat-fieldname = 'FIELD3'.
is_fieldcat-ref_field = 'BEGDA'.
is_fieldcat-ref_table = 'PA0002'.
APPEND is_fieldcat TO it_fieldcat.
* Create a new Table
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = it_fieldcat
IMPORTING
ep_table = new_table.
* Create a new Line with the same structure of the table.
ASSIGN new_table->* TO <l_table>.
CREATE DATA new_line LIKE LINE OF <l_table>.
ASSIGN new_line->* TO <l_line>.
* Test it...
DO 30 TIMES.
ASSIGN COMPONENT 'FIELD1' OF STRUCTURE <l_line> TO <l_field>.
<l_field> = '12345'.
ASSIGN COMPONENT 'FIELD2' OF STRUCTURE <l_line> TO <l_field>.
<l_field> = 'X'.
ASSIGN COMPONENT 'FIELD3' OF STRUCTURE <l_line> TO <l_field>.
<l_field> = '20030101'.
INSERT <l_line> INTO TABLE <l_table>.
ENDDO.
LOOP AT <l_table> ASSIGNING <l_line>.
* ASSIGN COMPONENT 'field1' OF STRUCTURE <l_line> TO <l_field>.
WRITE / <l_line>.
ENDLOOP.
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