我正在从数据库中进行大量选择,目的是将其保存在应用程序服务器或本地目录中。 由于数据库有很多条目,因此我首先尝试这种方式:
SELECT * FROM db PACKAGE SIZE iv_package
INTO CORRESPONDING FIELDS OF TABLE rt_data
WHERE cond IN so_cond
AND cond1 IN so_cond1.
SAVE(rt_data).
ENDSELECT.
这导致转储,并显示以下消息:
运行时错误:DBIF_RSQL_INVALID_CURSOR
实例:CX_SY_OPEN_SQL_DB
我也尝试了另一种方法:
OPEN CURSOR WITH HOLD s_cursor FOR
SELECT * FROM db
WHERE cond IN so_cond
AND cond1 IN so_cond1.
DO.
FETCH NEXT CURSOR s_cursor INTO TABLE rt_data PACKAGE SIZE iv_package.
SAVE(rt_data).
ENDDO.
这也导致转储带有相同的消息。
这种情况下最好的方法是什么?
答案 0 :(得分:5)
TYPES:
BEGIN OF key_package_type,
from TYPE primary_key_type,
to TYPE primary_key_type,
END OF key_package_type.
TYPES key_packages_type TYPE STANDARD TABLE OF key_package WITH EMPTY KEY.
DATA key_packages TYPE key_packages_type.
* select only the primary keys, in packages
SELECT primary_key_column FROM db
INTO TABLE @DATA(key_package) PACKAGE SIZE package_size
WHERE cond IN @condition AND cond1 IN other_condition
ORDER BY primary_key_column.
INSERT VALUE #( from = key_package[ 1 ]-primary_key_column
to = key_package[ lines( key_package ) ]-primary_key_column )
INTO TABLE key_packages.
ENDSELECT.
* select the actual data by the primary key packages
LOOP AT key_packages INTO key_package.
SELECT * FROM db INTO TABLE @DATA(result_package)
WHERE primary_key_column >= key_package-from
AND primary_key_column <= key_package-to.
save_to_file( result_package ).
ENDLOOP.
如果您的表具有复合主键,即多列,例如{MANDT,GJAHR,BELNR},则只需用结构替换from
和to
字段的类型并调整列列表相应地,在第一个SELECT中选择WHERE条件。