vba - 从 Excel VBA 调用 Oracle PL SQL 函数

Question

我正在尝试从 Excel VBA 调用 PL SQL 函数。当我在 ORACLE SQL DEVELOPER 上执行它时，它运行得很好。但是当我尝试从 excel vba 运行相同的内容时，它给出了以下错误。

请查看以下代码片段。

Private Sub CommandButton1_Click()

    Dim con As Object
    Dim rs As Object
    Dim cmd As Object
    Dim sQuery As String
    Set con = CreateObject("ADODB.Connection")
    Set rs = CreateObject("ADODB.Recordset")
    Set cmd = CreateObject("ADODB.Command")

    strcon = "Provider=OraOledb.Oracle;Data Source=10.1.2.238:1521/oracle.MultiActTrade.LOCAL; User ID=; Password=;Persist Security Info=True"
    con.Open strcon

    sQuery = "SELECT * FROM TABLE(MA_DWM_AVG(TO_CHAR('L48D88-S-IN'),TO_NUMBER(2),TO_NUMBER(11),TO_NUMBER(40)))"
    cmd.ActiveConnection = con
    cmd.CommandText = sQuery
    Set rs = cmd.Execute()

    Sheets("Sheet1").Cells(2, 1).CopyFromRecordset rs

    rs.Close
End Sub

即使使用 sQuery 如下所示，错误仍然存​​在。变量数据类型已经得到很好的处理。不存在类型不匹配的情况。

SELECT * FROM TABLE(MA_DWM_AVG('L48D88-S-IN',2,11,40))

以下是我遇到错误的函数代码。函数代码非常大，因此仅给出所需的代码片段。

create or replace function MA_DWM_AVG(FID IN VARCHAR, CHOICE INT, PERIOD1 INT,PERIOD2 INT)
return TEMP_NESTED as

 --to create a seperate transcion for the function we have created.
  PRAGMA AUTONOMOUS_TRANSACTION;
  V_RET TEMP_NESTED;

begin
--TRUNCATING GTT TABLE USED IN A FUNCTION
EXECUTE IMMEDIATE 'TRUNCATE TABLE GTT_DWM_STATS';
--IF DAILTY STATISTICS ARE NEEDED THEN CHOICE=1
--We calculate rownumber,fs_perm_sec_id, date ,closing value its avearages    for 2 periods, open price, high price for the day, low price for the day

--weekly statistics are allculated if choice=2
IF CHOICE =2 AND PERIOD1<>0 AND PERIOD2<>0 THEN
--First we calculate rownumber,fs_perm_sec_id, week end date, Closing price and its average for 2 periods


INSERT INTO GTT_DWM_STATS(ROWNUMBER,FID,CLOSINGDATE,PRICE_CLOSE,MOVINGAVERAGE_PERIOD1,MOVINGAVERAGE_PERIOD2) 
    SELECT ROWNUM,FS_PERM_SEC_ID,"DATE",PPRICE,
        CASE 
            WHEN COUNT(PPRICE) OVER (ORDER BY "DATE" DESC ROWS BETWEEN CURRENT ROW AND PERIOD1-1 FOLLOWING) >= PERIOD1
        THEN AVG(PPRICE) OVER (ORDER BY "DATE" DESC ROWS BETWEEN CURRENT ROW AND PERIOD1-1 FOLLOWING)
        ELSE NULL
        END AS "Moving Average Period 1",
        CASE 
            WHEN COUNT(PPRICE) OVER (ORDER BY "DATE" DESC ROWS BETWEEN CURRENT ROW AND PERIOD2-1 FOLLOWING) >= PERIOD2
        THEN AVG(PPRICE) OVER (ORDER BY "DATE" DESC ROWS BETWEEN CURRENT ROW AND PERIOD2-1 FOLLOWING)
        ELSE NULL
        END AS "Moving Average Period 2"
        FROM(
                SELECT FS_PERM_SEC_ID,"DATE",P_PRICE AS PPRICE,P_VOLUME,
                    CASE 
                        WHEN (TO_CHAR("DATE",'D') >= AVG(TO_CHAR("DATE",'D')) OVER (order by "DATE" DESC rows between 1 preceding and current row) and ROWNUM>=1) 
                            or TO_CHAR("DATE",'D')=6
                    THEN 1
                    ELSE 0
                    END AS WEEKFLAG
                FROM FP_BASIC_BD WHERE FS_PERM_SEC_ID=FID AND P_VOLUME<>0 ORDER BY "DATE" DESC) WHERE WEEKFLAG=1;
--get week start date
--line 89 is here
UPDATE GTT_DWM_STATS 
    SET STARTDATE = 
        (SELECT "DATE" FROM FP_BASIC_BD  WHERE FP_BASIC_BD.FS_PERM_SEC_ID=FID AND FP_BASIC_BD."DATE">=TO_CHAR(TRUNC(TO_DATE(GTT_DWM_STATS.CLOSINGDATE,'DD-MON-YY'), 'IW'),'DD-MON-YY') AND P_VOLUME<>0 AND ROWNUM=1) 
        WHERE EXISTS (SELECT FP_BASIC_BD."DATE" FROM FP_BASIC_BD WHERE FP_BASIC_BD."DATE"=GTT_DWM_STATS.CLOSINGDATE );
--get opening price for the week
UPDATE GTT_DWM_STATS
    SET PRICE_OPEN = 
        (SELECT FP_BASIC_BD.P_PRICE_OPEN FROM FP_BASIC_BD WHERE FP_BASIC_BD.FS_PERM_SEC_ID=GTT_DWM_STATS.FID AND FP_BASIC_BD."DATE"=GTT_DWM_STATS.STARTDATE);
--get high value of p_price_high for week's duration
UPDATE GTT_DWM_STATS 
    SET PRICE_HIGH= 
        (SELECT MAX(P_PRICE_HIGH) FROM FP_BASIC_BD WHERE FP_BASIC_BD.FS_PERM_SEC_ID=FID AND FP_BASIC_BD."DATE" BETWEEN GTT_DWM_STATS.STARTDATE AND GTT_DWM_STATS.CLOSINGDATE)
        WHERE EXISTS(SELECT P_PRICE_HIGH FROM FP_BASIC_BD WHERE FP_BASIC_BD.FS_PERM_SEC_ID=GTT_DWM_STATS.FID);
--get low value of p_price_low for week's duration
UPDATE GTT_DWM_STATS 
    SET PRICE_LOW= 
        (SELECT MIN(P_PRICE_LOW) FROM FP_BASIC_BD WHERE FP_BASIC_BD.FS_PERM_SEC_ID=FID AND FP_BASIC_BD."DATE" BETWEEN GTT_DWM_STATS.STARTDATE AND GTT_DWM_STATS.CLOSINGDATE) WHERE EXISTS(SELECT P_PRICE_LOW FROM FP_BASIC_BD WHERE FP_BASIC_BD.FS_PERM_SEC_ID=GTT_DWM_STATS.FID);


END IF;


--get the GTT values into table derived from object type and return it.
select 
    cast(
    multiset(

                select * from GTT_DWM_STATS WHERE GTT_DWM_STATS.FID=FID ORDER BY CLOSINGDATE DESC

             )as TEMP_NESTED) into v_ret from dual;

   COMMIT;
   return V_RET;

end MA_DWM_AVG;

您还可以引用全局临时表的DDL，如下。

CREATE GLOBAL TEMPORARY TABLE "MA_FACTSET"."GTT_DWM_STATS" 
(   "ROWNUMBER" NUMBER(*,0), 
    "FID" VARCHAR2(20 BYTE), 
    "CLOSINGDATE" DATE, 
    "PRICE_CLOSE" FLOAT(126), 
    "MOVINGAVERAGE_PERIOD1" FLOAT(126), 
    "MOVINGAVERAGE_PERIOD2" FLOAT(126), 
    "STARTDATE" DATE, 
    "PRICE_OPEN" FLOAT(126), 
    "PRICE_HIGH" FLOAT(126), 
    "PRICE_LOW" FLOAT(126)
   ) ON COMMIT PRESERVE ROWS ;      

请不要建议我将函数用作过程。因为函数正在使用全局临时表，并且最后它返回完整的表。因此将其作为强制功能使用。

Answer 1

您对日期的处理完全不正确。很难指出确切的位置，因为有一些潜在的位置。我将解释这段代码有什么问题(它取自您的“第 89 行”语句):

... FP_BASIC_BD."DATE">=TO_CHAR(TRUNC(TO_DATE(GTT_DWM_STATS.CLOSINGDATE,'DD-MON-YY'), 'IW'),'DD-MON-YY') ...

GTT_DWM_STATS.CLOSINGDATE 具有日期格式(根据您的 DDL 语句)。但是 to_date 函数将字符串作为第一个参数。在此位置，Oracle 执行以下操作:

• 隐式将日期转换为字符串(使用 session 格式)
• then to_date 函数尝试将其转换回日期，并将字符串视为以 'DD-MON-YY' 格式编写的日期
• 然后 trunc 截断日期
• 然后 to_char 将其再次转换为字符串，然后将字符串与日期进行比较(我猜)FP_BASIC_BD."DATE"
• 如果 FP_BASIC_BD."DATE" 是日期，Oracle 会再次将等号右侧表达式的结果隐式转换为日期
• 或者如果 FP_BASIC_BD."DATE" 是一个字符串，Oracle 将根据字符串比较规则来比较字符串。

这里你需要的是摆脱所有不必要的转换:

FP_BASIC_BD."DATE" >= TRUNC(GTT_DWM_STATS.CLOSINGDATE, 'IW')

之后，您必须仔细检查您正在处理日期的所有其他语句。如果函数采用日期作为输入参数，则必须传递日期，如果函数采用字符串 - 则传递字符串。比较也是如此:比较字符串与字符串、日期与日期。