动态建表SAP

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REPORT zdyn_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

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