輸入和輸出臨時表
將臨時表傳入和傳出程式,過程和函式非常簡單。
如果你希望過程處理的資料量大於你可以輕鬆儲存在字串或類似資料中的資料,這可能很方便。你可以將 temp-table 作為 INPUT
,OUTPUT
和 INPUT-OUTPUT
資料傳遞。
輸入一個臨時表並輸出另一個臨時表:
DEFINE TEMP-TABLE ttRequest NO-UNDO
FIELD fieldA AS CHARACTER
FIELD fieldB AS CHARACTER.
/* Define a temp-table with the same fields and indices */
DEFINE TEMP-TABLE ttResponse NO-UNDO LIKE ttRequest.
/* A procedure that simply swap the values of fieldA and fieldB */
PROCEDURE swapFields:
DEFINE INPUT PARAMETER TABLE FOR ttRequest.
DEFINE OUTPUT PARAMETER TABLE FOR ttResponse.
FOR EACH ttRequest:
CREATE ttResponse.
ASSIGN
ttResponse.fieldA = ttRequest.fieldB
ttResponse.fieldB = ttRequest.fieldA.
END.
END PROCEDURE.
CREATE ttRequest.
ASSIGN ttRequest.fieldA = "A"
ttRequest.fieldB = "B".
CREATE ttRequest.
ASSIGN ttRequest.fieldA = "B"
ttRequest.fieldB = "C".
CREATE ttRequest.
ASSIGN ttRequest.fieldA = "C"
ttRequest.fieldB = "D".
/* Call the procedure */
RUN swapFields ( INPUT TABLE ttRequest
, OUTPUT TABLE ttResponse).
FOR EACH ttResponse:
DISPLAY ttResponse.
END.
結果:
fieldA--------fieldB--------
B A
C B
D C
輸入輸出臨時表:
DEFINE TEMP-TABLE ttCalculate NO-UNDO
FIELD num1 AS INTEGER
FIELD num2 AS INTEGER
FIELD response AS DECIMAL.
PROCEDURE pythagoras:
DEFINE INPUT-OUTPUT PARAMETER TABLE FOR ttCalculate.
FOR EACH ttCalculate:
ttCalculate.response = SQRT( EXP(num1, 2) + EXP(num2, 2)).
END.
END PROCEDURE.
CREATE ttCalculate.
ASSIGN ttCalculate.num1 = 3
ttCalculate.num2 = 4.
CREATE ttCalculate.
ASSIGN ttCalculate.num1 = 6
ttCalculate.num2 = 8.
CREATE ttCalculate.
ASSIGN ttCalculate.num1 = 12
ttCalculate.num2 = 16.
/* Call the procedure */
RUN pythagoras ( INPUT-OUTPUT TABLE ttCalculate ).
FOR EACH ttCalculate:
DISPLAY ttCalculate.
END.
結果:
----------num1-- ----------num2-- -------response-
3 4 5.00
6 8 10.00
12 16 20.00
傳遞給功能
DEFINE TEMP-TABLE ttNumbers NO-UNDO
FIELD num1 AS INTEGER
FIELD num2 AS INTEGER
INDEX index1 num1 num2.
DEFINE VARIABLE iNum AS INTEGER NO-UNDO.
/* Forward declare the function */
FUNCTION hasAPair RETURNS LOGICAL (INPUT TABLE ttNumbers) FORWARD.
DO iNum = 1 TO 100:
CREATE ttNumbers.
ASSIGN ttNumbers.num1 = RANDOM(1,100)
ttNumbers.num2 = RANDOM(1,100).
END.
MESSAGE hasAPair(INPUT TABLE ttNumbers) VIEW-AS ALERT-BOX.
/* Function to check if two records has the same value in num1 and num2 */
FUNCTION hasAPair RETURNS LOGICAL (INPUT TABLE ttNumbers):
FIND FIRST ttNumbers WHERE ttNumbers.num1 = ttNumbers.num2 NO-ERROR.
IF AVAILABLE ttNumbers THEN
RETURN TRUE.
ELSE
RETURN FALSE.
END FUNCTION.
傳遞給程式檔案
你可以將 temp-tables 傳遞給其他 .p-programs,也可以將其傳遞給其他過程。唯一的區別是呼叫程式和被呼叫程式必須具有相同的臨時表宣告。一種簡單的方法是將臨時表程式儲存在第三個檔案中 - 包含在兩個程式中使用的包含。
包含臨時表定義的檔案:/ * ttFile.i * / DEFINE TEMP-TABLE ttFile NO-UNDO FIELD fName AS CHARACTER FORMAT“x(20)
”FIELD isADirectory AS LOGICAL。
程式檢查臨時表中的所有檔案。他們是目錄嗎?
/* checkFiles.p */
{ttFile.i}
DEFINE INPUT-OUTPUT PARAMETER TABLE FOR ttFile.
FOR EACH ttFile:
FILE-INFO:FILE-NAME = ttFile.fName.
IF FILE-INFO:FILE-TYPE BEGINS "D" THEN
ttFile.isADirectory = TRUE.
END.
主程式:
{ttFile.i}
CREATE ttFile.
ASSIGN ttFile.fname = "c:\temp\".
CREATE ttFile.
ASSIGN ttFile.fname = "c:\Windows\".
CREATE ttFile.
ASSIGN ttFile.fname = "c:\Windoose\".
RUN checkFiles.p(INPUT-OUTPUT TABLE ttFile).
FOR EACH ttFile:
DISPLAY ttFile.
END.
結果:
fName----------------- isADirector
c:\temp\ yes
c:\Windows\ yes
c:\Windoose\ no