日常取数的时候可能会存在动态SQL的问题，比如取数动态或者条件动态等情况，下面针对动态SQL做一个完整的处理。包括SELECT 、FROM、WHERE 以及 最后table的动态。
首先 数据定义，这里全按照表来append处理
TYPES:BEGIN OF ty_data,
edpline TYPE edpline,
END OF ty_data.
DATA:lt_select TYPE TABLE OF ty_data,
ls_select TYPE ty_data,
lt_from TYPE TABLE OF ty_data,
ls_from TYPE ty_data,
lt_where TYPE TABLE OF ty_data,
ls_where TYPE ty_data.动态SELECT 处理
CLEAR:ls_select.REFRESH:lt_select.
ls_select-edpline = 'mara~matnr,'.
APPEND ls_select TO lt_select.CLEAR:ls_select.
ls_select-edpline = 'makt~maktx,'.
APPEND ls_select TO lt_select.CLEAR:ls_select.
ASSIGN lt_select[ lines( lt_select ) ] TO FIELD-SYMBOL(<comp>).
REPLACE ',' IN <comp> WITH ''.动态表关联
CLEAR:ls_from.REFRESH:lt_from.
ls_from-edpline = 'MARA'.
APPEND ls_from TO lt_from.CLEAR:ls_from.
ls_from-edpline = 'INNER JOIN MAKT'.
APPEND ls_from TO lt_from.CLEAR:ls_from.
ls_from-edpline = 'ON MARA~MATNR = MAKT~MATNR'.
APPEND ls_from TO lt_from.CLEAR:ls_from.动态where 条件
CLEAR:ls_where.REFRESH:lt_where.
ls_where = 'MAKT~SPRAS = @SY-LANGU'.
APPEND ls_where TO lt_where.CLEAR:ls_where.
ls_where = 'AND MARA~MTART = `Z120`'.
APPEND ls_where TO lt_where.CLEAR:ls_where.搭建动态表
***构建动态表
DATA:gt_fieldcat TYPE lvc_t_fcat,
gs_fieldcat TYPE lvc_s_fcat.
DATA: dy_table TYPE REF TO data,
dy_line TYPE REF TO data.
FIELD-SYMBOLS: <dyn_table> TYPE STANDARD TABLE,
<dyn_wa>.
DEFINE fill_field.
CLEAR gs_fieldcat.
gs_fieldcat-fieldname = &1.
gs_fieldcat-coltext = &2.
gs_fieldcat-ref_table = &3.
gs_fieldcat-ref_field = &4.
gs_fieldcat-scrtext_l = gs_fieldcat-scrtext_m = gs_fieldcat-scrtext_s = gs_fieldcat-reptext = gs_fieldcat-coltext.
APPEND gs_fieldcat TO gt_fieldcat.
END-OF-DEFINITION.
fill_field 'MATNR' '物料号' 'MARA' 'MATNR'.
fill_field 'MAKTX' '物料描述' 'MAKT' 'MAKTX'.
* 根据it_fact生成动态表
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = gt_fieldcat[]
IMPORTING
ep_table = dy_table.
ASSIGN dy_table->* TO <dyn_table>.
CREATE DATA dy_line LIKE LINE OF <dyn_table>.
ASSIGN dy_line->* TO <dyn_wa>.SQL 以及展示
SELECT (lt_select)
FROM (lt_from)
INTO TABLE @<dyn_table>
WHERE (lt_where).
LOOP AT <dyn_table> ASSIGNING <dyn_wa>.
ASSIGN COMPONENT 'MATNR' OF STRUCTURE <dyn_wa> TO FIELD-SYMBOL(<fv_matnr>).
ASSIGN COMPONENT 'MAKTX' OF STRUCTURE <dyn_wa> TO FIELD-SYMBOL(<fv_maktx>).
WRITE:/ <fv_matnr>,<fv_maktx>.
ENDLOOP.完整代码
TYPES:BEGIN OF ty_data,
edpline TYPE edpline,
END OF ty_data.
DATA:lt_select TYPE TABLE OF ty_data,
ls_select TYPE ty_data,
lt_from TYPE TABLE OF ty_data,
ls_from TYPE ty_data,
lt_where TYPE TABLE OF ty_data,
ls_where TYPE ty_data.
TYPES:BEGIN OF gy_matnr,
matnr TYPE mara-matnr,
maktx TYPE makt-maktx,
END OF gy_matnr.
DATA:gs_matnr TYPE gy_matnr,
gt_matnr TYPE TABLE OF gy_matnr.
DATA:ls_data TYPE REF TO data.
FIELD-SYMBOLS:<ft_data> TYPE ANY TABLE.
CLEAR:ls_select.REFRESH:lt_select.
ls_select-edpline = 'mara~matnr,'.
APPEND ls_select TO lt_select.CLEAR:ls_select.
ls_select-edpline = 'makt~maktx,'.
APPEND ls_select TO lt_select.CLEAR:ls_select.
ASSIGN lt_select[ lines( lt_select ) ] TO FIELD-SYMBOL(<comp>).
REPLACE ',' IN <comp> WITH ''.
CLEAR:ls_from.REFRESH:lt_from.
ls_from-edpline = 'MARA'.
APPEND ls_from TO lt_from.CLEAR:ls_from.
ls_from-edpline = 'INNER JOIN MAKT'.
APPEND ls_from TO lt_from.CLEAR:ls_from.
ls_from-edpline = 'ON MARA~MATNR = MAKT~MATNR'.
APPEND ls_from TO lt_from.CLEAR:ls_from.
CLEAR:ls_where.REFRESH:lt_where.
ls_where = 'MAKT~SPRAS = @SY-LANGU'.
APPEND ls_where TO lt_where.CLEAR:ls_where.
ls_where = 'AND MARA~MTART = `Z120`'.
APPEND ls_where TO lt_where.CLEAR:ls_where.
***构建动态表
DATA:gt_fieldcat TYPE lvc_t_fcat,
gs_fieldcat TYPE lvc_s_fcat.
DATA: dy_table TYPE REF TO data,
dy_line TYPE REF TO data.
FIELD-SYMBOLS: <dyn_table> TYPE STANDARD TABLE,
<dyn_wa>.
DEFINE fill_field.
CLEAR gs_fieldcat.
gs_fieldcat-fieldname = &1.
gs_fieldcat-coltext = &2.
gs_fieldcat-ref_table = &3.
gs_fieldcat-ref_field = &4.
gs_fieldcat-scrtext_l = gs_fieldcat-scrtext_m = gs_fieldcat-scrtext_s = gs_fieldcat-reptext = gs_fieldcat-coltext.
APPEND gs_fieldcat TO gt_fieldcat.
END-OF-DEFINITION.
fill_field 'MATNR' '物料号' 'MARA' 'MATNR'.
fill_field 'MAKTX' '物料描述' 'MAKT' 'MAKTX'.
* 根据it_fact生成动态表
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = gt_fieldcat[]
IMPORTING
ep_table = dy_table.
ASSIGN dy_table->* TO <dyn_table>.
CREATE DATA dy_line LIKE LINE OF <dyn_table>.
ASSIGN dy_line->* TO <dyn_wa>.
SELECT (lt_select)
FROM (lt_from)
INTO TABLE @<dyn_table>
WHERE (lt_where).
LOOP AT <dyn_table> ASSIGNING <dyn_wa>.
ASSIGN COMPONENT 'MATNR' OF STRUCTURE <dyn_wa> TO FIELD-SYMBOL(<fv_matnr>).
ASSIGN COMPONENT 'MAKTX' OF STRUCTURE <dyn_wa> TO FIELD-SYMBOL(<fv_maktx>).
WRITE:/ <fv_matnr>,<fv_maktx>.
ENDLOOP.
BREAK-POINT.这里只是一个简单的代码，但是由简到难道理都一样，看具体需求去做具体的处理。
简单跑一下代码实现结果
