ABAP Help Document(25):11.4 Data Cluster
11.4 Data Cluster
数据集群,将一组数据存储在storage medium。
1.EXPORT
语法:
EXPORT parameter_list TO medium [COMPRESSION {ON|OFF}].
COMPRESSION是否压缩形式存储在内存;
parameter_list:
{p1 = dobj1 p2 = dobj2 ...} | {p1 FROM dobj1 p2 FROM dobj2 ...} | (ptab) ... .
建议使用=号传递数据,ptab只有两列的参数表,第一列参数名(必须字符类型),第二列参数值对象;
medium:
{ DATA BUFFER xstr }
| { INTERNAL TABLE itab }
| { MEMORY ID id }
| {
DATABASE dbtab(ar) [FROM wa] [CLIENT cl] ID id }
| { SHARED MEMORY dbtab(ar)
[FROM wa] [CLIENT cl] ID id }
| { SHARED BUFFER dbtab(ar)
[FROM wa] [CLIENT cl] ID id } ... .
id为字符型,最长60;
2.IMPORT
语法:
IMPORT parameter_list FROM medium [conversion_options].
parameter_list:
{p1 = dobj1 p2 = dobj2 ...} | {p1 TO dobj1 p2 TO dobj2 ...} | (ptab) ... .
medium:
{ DATA BUFFER xstr }
| { INTERNAL TABLE
itab }
| { MEMORY ID id }
| {
DATABASE dbtab(ar) [TO wa] [CLIENT cl] ID id }
| { SHARED MEMORY
dbtab(ar) [TO wa] [CLIENT cl] ID id }
| { SHARED BUFFER
dbtab(ar) [TO wa] [CLIENT cl] ID id } ... .
conversion_options:
{ { { {[ACCEPTING
PADDING] [ACCEPTING TRUNCATION]}
|
[IGNORING STRUCTURE BOUNDARIES] }
[IGNORING
CONVERSION ERRORS [REPLACEMENT CHARACTER rc]] }
| [IN
CHAR-TO-HEX MODE] }
[CODE
PAGE INTO cp]
[ENDIAN
INTO endian].
DATA BUFFER,INTERNAL TABLE,DATABASE支持所有options,
其他仅支持一下options:[ACCEPTING PADDING] [ACCEPTING TRUNCATION]
[IGNORING STRUCTURE BOUNDARIES]
[ACCEPTING PADDING]:支持source,target转换结构不同,target结构更复杂;
[ACCEPTING TRUNCATION]:支持source结构比target结构复杂;
[IGNORING STRUCTURE BOUNDARIES]:支持INCLUDE结构,不能和上面options同时使用;
[IN CHAR-TO-HEX MODE]:转换c到x;
[CODE PAGE INTO cp]:表TCP00,字段CPCODEPAGE,cp值;
[ENDIAN INTO endian]:大端小端,ABAP_ENDIAN类型,‘B’或‘L’
3.IMPORT DIRECTORY
语法:
IMPORT DIRECTORY INTO itab FROM DATABASE dbtab(ar) [TO wa] [CLIENT cl] ID id.
itab类型为CDIR,获取字段类型等信息;
NAME |
CHAR(30) |
Name of the parameter under which a data object was saved. |
OTYPE: |
CHAR(1) |
"F" for elementary, flat data objects, "G" for strings, "R" for flat structures, "S" for deep structures, "T" for internal tables with flat row type "C" for tables with a deep row type. |
FTYPE |
CHAR(1) |
DESCRIBE FIELD ... TYPE ("a", "b", "C", "D", "e", "F", "g", "I", "N", "P", "s", "T", "X", "y"). v复杂结构,h内表 |
TFILL |
INT4 |
已保存数据对象长度 |
FLENG |
INT2 |
已保存数据对象长度或已保存表行长度 |
4.FREE MEMORY
语法:
FREE MEMORY ID id.
功能和DELETE FROM MEMORY ID id一致;
5.DELETE FROM
语法:
DELETE FROM { {MEMORY
ID id}
|
{DATABASE dbtab(ar) [CLIENT cl] ID id}
|
{SHARED MEMORY dbtab(ar) [CLIENT cl] ID id}
|
{SHARED BUFFER dbtab(ar) [CLIENT cl] ID id} }.
示例:
"数据集群 FORM f_data_cluster_exp. TYPES:BEGIN OF s_tab, name TYPE string, dobj TYPE string, END OF s_tab. DATA:lt_tab TYPE TABLE OF s_tab. DATA:ls_tab LIKE LINE OF lt_tab. DATA:lv_p1 TYPE string. DATA:test1 TYPE string VALUE 'hello'. ls_tab-name = 'P1'. ls_tab-dobj = 'test1'. APPEND ls_tab TO lt_tab. "存储到data buffer DATA:lv_xstr TYPE xstring. EXPORT (lt_tab) TO DATA BUFFER lv_xstr. WRITE:/ lv_xstr. "存储到internal table TYPES:BEGIN OF s_itab, col1 TYPE i, col2 TYPE x, END OF s_itab. DATA:lt_itab TYPE TABLE OF s_itab. EXPORT p2 = test1 TO INTERNAL TABLE lt_itab. "存储到memory id EXPORT (lt_tab) TO MEMORY ID 'M_ID'. "读取 IMPORT p1 = lv_p1 FROM MEMORY ID 'M_ID'. WRITE:/ lv_p1. "存储到database "ar双字符,RELID值; "demo_indx_table表必须有RELID,SRTF2字段 DATA:lt_spfli TYPE TABLE OF spfli. DATA:ls_spfli LIKE LINE OF lt_spfli. DATA:wa_indx TYPE demo_indx_table. SELECT * FROM spfli INTO TABLE lt_spfli. EXPORT tab = lt_spfli TO DATABASE demo_indx_table(SQ) FROM wa_indx ID 'TAB'. "读取 IMPORT tab = lt_spfli FROM DATABASE demo_indx_table(SQ) TO wa_indx ID 'TAB'. LOOP AT lt_spfli INTO ls_spfli. WRITE:/ ls_spfli-carrid. ENDLOOP. "存储到shared memory,burrfer "rsdb/esm/buffersize_kb (SHARED MEMORY) "rsdb/obj/buffersize (SHARED BUFFER) "memory达到最大size,需要使用DELETE FROM SHARED MEMORY EXPORT tab = lt_spfli TO SHARED MEMORY demo_indx_table(SQ) FROM wa_indx ID 'TAB_MOMO'. "buffer会自动清空,达到最大size EXPORT tab = lt_spfli TO SHARED BUFFER demo_indx_table(SQ) FROM wa_indx ID 'TAB_BUFFER'. "删除 DELETE FROM MEMORY ID 'M_ID'. DELETE FROM DATABASE demo_indx_table(SQ) ID 'TAB'. DELETE FROM SHARED MEMORY demo_indx_table(SQ) ID 'TAB_MOMO'. DELETE FROM SHARED BUFFER demo_indx_table(SQ) ID 'TAB_BUFFER'. ENDFORM.
6.System Class for Data Cluster
CL_ABAP_EXPIMP_MEM
CL_ABAP_EXPIMP_SHMEM
CL_ABAP_EXPIMP_SHBUF
CL_ABAP_EXPIMP_DB
CL_ABAP_EXPIMP_CONV
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