FUNCTION EXTRACT_TABLE_DATA .
*"----------------------------------------------------------------------
*"*"區域介面：
*" TABLES
*" FIELDS STRUCTURE ZSQL_CLAUSE_ELEMENTS
*" FROMCLAUSE STRUCTURE ZSQL_CLAUSE_ELEMENTS
*" WHERECLAUSE STRUCTURE ZSQL_CLAUSE_ELEMENTS
*" DATA STRUCTURE ZTABLEROWS
*"----------------------------------------------------------------------
*"----------------------------------------------------------------------
*" Copy selected fields from QUERY_TABLE to DATA_STRUCTURE
*"----------------------------------------------------------------------
TYPE-POOLS: abap.
DATA:
columnName TYPE SO_TEXT,
fieldDataDescrRef TYPE REF TO abap_componentdescr,
numberFields TYPE i,
fieldDescr TYPE abap_componentdescr,
fieldname TYPE string,
fieldDescrTab TYPE abap_component_tab,
rowStructDescr TYPE REF TO cl_abap_structdescr,
rowReference TYPE REF TO data,
returnRowString TYPE string,
dataFieldString TYPE string,
dataline LIKE data,
fromClauseRow TYPE ZSQL_CLAUSE_ELEMENTS,
fromClauseString TYPE string,
whereClauseRow TYPE ZSQL_CLAUSE_ELEMENTS,
whereClauseString TYPE string,
fieldsRow TYPE ZSQL_CLAUSE_ELEMENTS.
FIELD-SYMBOLS:
<datarow> TYPE ANY,
<datafield> TYPE ANY.
* CREATE DataStructure with field names
* Datatypes are read from fieldnames of FIELDS input table
DESCRIBE TABLE FIELDS LINES numberFields.
LOOP AT FIELDS INTO fieldsRow.
fieldname = SY-TABIX.
* names need to be unique and must start with a char
CONCATENATE 'string' fieldname INTO fieldname.
CONDENSE fieldname.
fieldDescr-name = fieldname.
* for dictionary lookup we need to change columnnames from Open SQL
* to dictionary notation
columnName = fieldsRow-TEXT.
REPLACE FIRST OCCURRENCE OF SUBSTRING '~' IN columnName WITH '-' RESPECTING CASE.
fieldDescr-type ?= cl_abap_typedescr=>describe_by_name( columnName ).
APPEND fieldDescr TO fieldDescrTab.
ENDLOOP.
rowStructDescr = cl_abap_structdescr=>create( fieldDescrTab ).
* now we create the actual data structure in memory
create data rowReference type HANDLE rowStructDescr.
* finally we assign it to the Field-symbol used by the select statement
ASSIGN rowReference->* TO <datarow>.
* End Create DataStructure
* to simplify calls we concatenate from and whereclause into strings
* this way caller doesn't need to check word wrappings
fromClauseString = ''.
LOOP AT FROMCLAUSE INTO fromClauseRow.
CONCATENATE fromClauseString fromClauseRow-TEXT INTO fromClauseString.
ENDLOOP.
whereClauseString = ''.
LOOP AT WHERECLAUSE INTO whereClauseRow.
CONCATENATE whereClauseString whereClauseRow-TEXT INTO whereClauseString.
ENDLOOP.
* Now start actual select operation
SELECT (FIELDS) FROM (fromClauseString) INTO <datarow> WHERE (whereClauseString).
* we read all fields of the current row, cast it to string and
* concatenate it into a dataline with division chars.
CLEAR: returnRowString.
DO numberFields TIMES.
ASSIGN component sy-index of structure <datarow> to <datafield>.
dataFieldString = <datafield>.
CONCATENATE returnRowString '|' datafieldstring INTO returnRowString.
ENDDO.
dataline = returnRowString.
* finally dataline is added to the return table.
INSERT dataline INTO TABLE data.
ENDSELECT.
ENDFUNCTION.
使用範例
沒有留言:
張貼留言