Field Symbols高级使用教程

1、通过field-symbols直接复制内表数据

1. DATA: lt_1 TYPE STANDARD TABLE OF t100.
   
2. DATA: lt_2 TYPE STANDARD TABLE OF t100.
   
3. FIELD-SYMBOLS: <lt_1> TYPE ANY TABLE.
   
4. FIELD-SYMBOLS: <lt_2> TYPE ANY TABLE.
   
5. 
   
6. ASSIGN lt_1 TO <lt_1>.
   
7. 
   
8. SELECT * FROM t100
   
9.   INTO TABLE <lt_1>
   
10.   UP TO 10 ROWS.
    
11. 
    
12. ASSIGN lt_2 TO <lt_2>.
    
13. <lt_2> = <lt_1>.
    
14. 
    
15. DATA: lv_lines TYPE i.
    
16. lv_lines = lines( lt_2 ).
    
17. WRITE: lv_lines.

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2、通过field-symbols一条条复制内表数据

1. DATA: lt_1 TYPE STANDARD TABLE OF t100.
   
2. DATA: lt_2 TYPE STANDARD TABLE OF t100.
   
3. FIELD-SYMBOLS: <ls_1> TYPE t100.
   
4. FIELD-SYMBOLS: <ls_2> TYPE t100.
   
5. 
   
6. SELECT * FROM t100
   
7.   INTO TABLE lt_1
   
8.   UP TO 10 ROWS.
   
9. 
   
10. LOOP AT lt_1 ASSIGNING <ls_1>.
    
11.   APPEND INITIAL LINE TO lt_2 ASSIGNING <ls_2>.
    
12.   <ls_2> = <ls_1>.
    
13. ENDLOOP.
    
14. 
    
15. DATA: lv_lines TYPE i.
    
16. lv_lines = lines( lt_2 ).
    
17. WRITE: lv_lines.

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3、Field Symbol 以结构中字段名称访问数据

1. DATA: lt_1 TYPE STANDARD TABLE OF t100.
   
2. FIELD-SYMBOLS: <ls_1> LIKE LINE OF lt_1.
   
3. 
   
4. SELECT * FROM t100
   
5.   INTO TABLE lt_1
   
6.   UP TO 10 ROWS.
   
7. 
   
8. * dynamic access
   
9. DATA: lv_field TYPE char30.
   
10. FIELD-SYMBOLS: <lv_field> TYPE any.
    
11. lv_field = 'TEXT'.
    
12. LOOP AT lt_1 ASSIGNING <ls_1>.
    
13.   ASSIGN COMPONENT lv_field OF STRUCTURE <ls_1> TO <lv_field>.
    
14.   CHECK <lv_field> IS ASSIGNED.
    
15.   WRITE: / <lv_field>.
    
16. ENDLOOP.

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4、Field Symbol 以结构中字段顺序号访问数据

1. SELECT * FROM t100
   
2.   INTO TABLE lt_1
   
3.   UP TO 10 ROWS.
   
4. 
   
5. * dynamic access
   
6. DATA: lv_comp_number TYPE i.
   
7. FIELD-SYMBOLS: <lv_field> TYPE any.
   
8. lv_comp_number = 4.
   
9. LOOP AT lt_1 ASSIGNING <ls_1>.
   
10.   ASSIGN COMPONENT lv_comp_number OF STRUCTURE <ls_1> TO <lv_field>.
    
11.   CHECK <lv_field> IS ASSIGNED.
    
12.   WRITE: / <lv_field>.
    
13. ENDLOOP.

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感谢分享

很实用，很全面的Field Symbol知识