SAP 动态内表demo----自用

*&---------------------------------------------------------------------*
*& Report Z_TEST
*&---------------------------------------------------------------------*
*&
*&---------------------------------------------------------------------*
REPORT Z_TEST.
FIELD-SYMBOLS: <dyn_table> TYPE STANDARD TABLE,
              <dyn_wa>,
              <dyn_field>.
DATA: dy_table TYPE REF TO data,
     dy_line  TYPE REF TO data,
     it_structure TYPE lvc_t_fcat,
     wa_structure TYPE lvc_s_fcat.
START-OF-SELECTION.
 PERFORM create_structure.  " 定义内表的结构

 PERFORM create_dynamic_table.  " 按照定义的内表结构，产生一个内表

 PERFORM write_data_to_dyntable.  " 向动态内表中写数

 PERFORM output_dyntable_data.   " 从动态内表中取数，并写到屏幕

*&---------------------------------------------------------------------*
*&      Form  create_structure
*&---------------------------------------------------------------------*
FORM create_structure .
 wa_structure-fieldname = 'COL1'.  " 第一列列名
 wa_structure-col_pos   = 1.       " 表示第一列 --- 可心省略，默认情况下，第一行对应到生产内表的第一列，如果指定，则按指定的列顺序生成内表
 wa_structure-inttype = 'C'.       " 数据类型
 wa_structure-intlen = 6.          " 长度
 APPEND wa_structure TO it_structure.

 wa_structure-fieldname = 'COL2'.  " 第二列列名
 wa_structure-col_pos   = 2.       " 表示第二列--- 可心省略，默认情况下，第一行对应到生产内表的第一列，如果指定，则按指定的列顺序生成内表
 wa_structure-inttype = 'C'.       " 数据类型
 wa_structure-intlen = 6.          " 长度
 APPEND wa_structure TO it_structure.

 wa_structure-fieldname = 'COL3'.  " 第三列名
 wa_structure-col_pos   = 3.       " 表示第三列 --- 可心省略，默认情况下，第一行对应到生产内表的第一列，如果指定，则按指定的列顺序生成内表
 wa_structure-inttype = 'C'.       " 数据类型
 wa_structure-intlen = 6.          " 长度
 APPEND wa_structure TO it_structure.
ENDFORM.                    " create_structure
*&---------------------------------------------------------------------*
*&      Form  create_dynamic_table
*&---------------------------------------------------------------------*
FORM create_dynamic_table .

 CALL METHOD cl_alv_table_create=>create_dynamic_table
   EXPORTING
     it_fieldcatalog = it_structure
   IMPORTING
     ep_table        = dy_table.

 ASSIGN dy_table->* TO <dyn_table>.    " 用表类型指针 <dyn_table> 指向 数据对象的内容.
ENDFORM.                    " create_dynamic_table
*&---------------------------------------------------------------------*
*&      Form  write_data_to_dyntable
*&---------------------------------------------------------------------*
FORM write_data_to_dyntable .
 DATA:wa_new_line TYPE REF TO data.
 DATA:i TYPE n.
 DATA:j TYPE n.
 CREATE DATA wa_new_line LIKE LINE OF <dyn_table>.  " 建立一个与动态内表结构相同的数据对象，且数据对象为是一个结构
 ASSIGN wa_new_line->* TO <dyn_wa>.

 " 用<dyn_wa>指针指向该结构
 DO 3 TIMES.
   i = i + 1.
   CLEAR j.
   LOOP AT it_structure INTO wa_structure.
     j = j + 1.
     ASSIGN COMPONENT wa_structure-fieldname OF STRUCTURE <dyn_wa> TO <dyn_field>.  " 用指针 <dyn_field>指向工作区<dyn_wa>中的一个字段，字段名为wa_structure-fieldname.
     CONCATENATE i j INTO <dyn_field>.                                              " 给指针指向的字段赋值
   ENDLOOP.
   APPEND <dyn_wa> TO <dyn_table>.
 ENDDO.
ENDFORM.                    " write_data_to_dyntable

*&---------------------------------------------------------------------*
*&      Form  output_dyntable_data
*&---------------------------------------------------------------------*
FORM output_dyntable_data .
 LOOP AT it_structure INTO wa_structure.
   WRITE: wa_structure-fieldname(5).
 ENDLOOP.
 LOOP AT <dyn_table> INTO <dyn_wa>.
   WRITE: / .
   LOOP AT it_structure INTO wa_structure.
     ASSIGN COMPONENT wa_structure-fieldname OF STRUCTURE <dyn_wa> TO <dyn_field>.  " 用指针 <dyn_field>指向工作区<dyn_wa>中的一个字段，字段名为wa_structure-fieldname.
     WRITE: <dyn_field>.
   ENDLOOP.
 ENDLOOP.
ENDFORM.                    " output_dyntable_data