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我有下面的应用程序引擎程序，我正在稍微修改，现在我得到一个 NULL 插入错误（无法将值 NULL 插入列 'EFFDT'，表 'XXX.dbo.PS_ITM_VNDR_UOM_PR'。在While块中有一条SQLExec语句：

SQLExec("SELECT A.VENDOR_ID FROM PS_ITM_VENDOR A, PS_ITM_VNDR_UOM B WHERE A.SETID = B.SETID AND A.INV_ITEM_ID = B.INV_ITEM_ID AND A.VENDOR_SETID = B.VENDOR_SETID AND A.VENDOR_ID = B.VENDOR_ID AND A.VENDOR_ID = :1 AND A.INV_ITEM_ID = :2 AND A.ITM_ID_VNDR = :3 AND A.ITM_VNDR_PRIORITY = 1 AND B.UNIT_OF_MEASURE = :4 AND B.CONVERSION_RATE = :5", &VendorId, &InvItemId, &ItmIdVndr, &UOM, &ConvRate, &VendorId_check);

需要修改程序以允许在尚不存在 UOM (UNIT_OF_MEASURE) 的地方插入新记录，因此我删除了对 UNIT_OF_MEASURE 的引用，如下所示，以便程序评估为 Else 条件：

SQLExec("SELECT A.VENDOR_ID FROM PS_ITM_VENDOR A, PS_ITM_VNDR_UOM B WHERE A.SETID = B.SETID AND A.INV_ITEM_ID = B.INV_ITEM_ID AND A.VENDOR_SETID = B.VENDOR_SETID AND A.VENDOR_ID = B.VENDOR_ID AND A.VENDOR_ID = :1 AND A.INV_ITEM_ID = :2 AND A.ITM_ID_VNDR = :3 AND A.ITM_VNDR_PRIORITY = 1 AND B.CONVERSION_RATE = :4", &VendorId, &InvItemId, &ItmIdVndr, &ConvRate, &VendorId_check);

但是，当我从上述代码块中删除 UNIT_OF_MEASURE SQL 和变量时，我会在表 ITM_VNDR_UOM_PR 的 EFFDT 列上收到 NULL 插入错误。似乎 &SQL CreateSQL 中定义的 &UOM 变量没有延续到插入 SQL 代码中。为什么会发生这种情况？在插入新行时，我可以做些什么来纠正并仍然能够使用 &UOM 的原始实例/值？以下是整个程序步骤：

Local SQL &SQL;
Local string &VendorId, &InvItemId, &ItmIdVndr, &UOM, &ConvRate, &PriceVndr, &Oprid, &PriceStatus, &VendorId_check, &insert_cols, &insert_select, &insert_where, &insert_sql, &Error, &MaxEffdt, &ItmField;
Local date &Effdt;
Local Record &ITM_VNDR_UOM_PR, &REC, &MASTER_ITEM_TBL;

&Oprid = "'BATCH'";
&PriceStatus = "2";
&Error = "N";

MessageBox(0, "", 0, 0, "**** BEGINING OF VALIDATION ERRORS ****");

&SQL = CreateSQL("SELECT VENDOR_ID, INV_ITEM_ID, ITM_ID_VNDR, UNIT_OF_MEASURE, CONVERSION_RATE, PRICE_VNDR, %DateOut(EFFDT), ITEM_FIELD_C10_B FROM PS_GH_ITM_PR_UPDT ORDER BY VENDOR_ID, INV_ITEM_ID, ITM_ID_VNDR", &VendorId, &InvItemId, &ItmIdVndr, &UOM, &ConvRate, &PriceVndr, &Effdt, &ItmField);

While &SQL.Fetch(&VendorId, &InvItemId, &ItmIdVndr, &UOM, &ConvRate, &PriceVndr, &Effdt, &ItmField)

   SQLExec("SELECT A.VENDOR_ID FROM PS_ITM_VENDOR A, PS_ITM_VNDR_UOM B WHERE A.SETID = B.SETID AND A.INV_ITEM_ID = B.INV_ITEM_ID AND A.VENDOR_SETID = B.VENDOR_SETID AND A.VENDOR_ID = B.VENDOR_ID AND A.VENDOR_ID = :1 AND A.INV_ITEM_ID = :2 AND A.ITM_ID_VNDR = :3 AND A.ITM_VNDR_PRIORITY = 1   AND B.CONVERSION_RATE = :4", &VendorId, &InvItemId, &ItmIdVndr, &ConvRate, &VendorId_check);

   If None(&VendorId_check) Then;
      &Error = "Y";
      MessageBox(0, "", 0, 0, &VendorId | " " | &InvItemId | " " | &ItmIdVndr | " " | &UOM | " " | &ConvRate | " " | &PriceVndr | " " | &Effdt | " " | &ItmField | " " | &Error);
   Else;
      MessageBox(0, "", 0, 0, &VendorId | " " | &InvItemId | " " | &ItmIdVndr | " " | &UOM | " " | &ConvRate | " " | &PriceVndr | " " | &Effdt | " " | &ItmField | " " | &Error);
      &CurrentDateTime = %Datetime;
      &Oprid = %OperatorId;
      &RECITEM = CreateRecord(Record.ITM_VNDR_UOM_PR);

      /*SQLExec("SELECT TO_CHAR(C.EFFDT,'DD-MON-YYYY') FROM PS_ITM_VNDR_UOM_PR C WHERE C.INV_ITEM_ID = :1 AND C.VENDOR_ID = :2 AND C.UNIT_OF_MEASURE = :3 AND C.EFFDT = (SELECT MAX(C1.EFFDT) FROM PS_ITM_VNDR_UOM_PR C1 WHERE C.SETID = C1.SETID AND C.INV_ITEM_ID = C1.INV_ITEM_ID AND C.VENDOR_SETID = C1.VENDOR_SETID AND C.VENDOR_ID = C1.VENDOR_ID AND C.VNDR_LOC = C1.VNDR_LOC AND C.UNIT_OF_MEASURE = C1.UNIT_OF_MEASURE AND C.CURRENCY_CD = C1.CURRENCY_CD AND C.QTY_MIN = C1.QTY_MIN)  ", &InvItemId, &VendorId, &UOM, &MaxEffdt);*/
      SQLExec("SELECT C.EFFDT FROM PS_ITM_VNDR_UOM_PR C WHERE C.INV_ITEM_ID = :1 AND C.VENDOR_ID = :2 AND C.UNIT_OF_MEASURE = :3 AND C.EFFDT = (SELECT MAX(C1.EFFDT) FROM PS_ITM_VNDR_UOM_PR C1 WHERE C.SETID = C1.SETID AND C.INV_ITEM_ID = C1.INV_ITEM_ID AND C.VENDOR_SETID = C1.VENDOR_SETID AND C.VENDOR_ID = C1.VENDOR_ID AND C.VNDR_LOC = C1.VNDR_LOC AND C.UNIT_OF_MEASURE = C1.UNIT_OF_MEASURE AND C.CURRENCY_CD = C1.CURRENCY_CD AND C.QTY_MIN = C1.QTY_MIN)  ", &InvItemId, &VendorId, &UOM, &MaxEffdt);

      SQLExec("%SelectAll(:1) WHERE INV_ITEM_ID = :2 AND VENDOR_ID = :3 AND UNIT_OF_MEASURE = :4 AND (CONVERT(CHAR(10),EFFDT,121)) = :5", &RECITEM, &InvItemId, &VendorId, &UOM, &MaxEffdt, &RECITEM);
      /*SQLExec("%SelectAll(:1) WHERE INV_ITEM_ID = :2 AND VENDOR_ID = :3 AND UNIT_OF_MEASURE = :4 AND EFFDT = :5", &RECITEM, &InvItemId, &VendorId, &UOM, &MaxEffdt, &RECITEM); */
      &new_UNIT_OF_MEASURE = &RECITEM.UNIT_OF_MEASURE.Value;
      &REC = CreateRecord(Record.ITM_VNDR_UOM_PR);
      &REC.SETID.Value = &RECITEM.SETID.Value;
      &REC.INV_ITEM_ID.Value = &RECITEM.INV_ITEM_ID.Value;
      &REC.VENDOR_SETID.Value = &RECITEM.VENDOR_SETID.Value;
      &REC.VENDOR_ID.Value = &RECITEM.VENDOR_ID.Value;
      &REC.VNDR_LOC.Value = &RECITEM.VNDR_LOC.Value;
      &REC.UNIT_OF_MEASURE.Value = &RECITEM.UNIT_OF_MEASURE.Value;
      &REC.CURRENCY_CD.Value = &RECITEM.CURRENCY_CD.Value;
      &REC.QTY_MIN.Value = &RECITEM.QTY_MIN.Value;
      &REC.EFFDT.Value = &Effdt;
      &REC.EFF_STATUS.Value = &RECITEM.EFF_STATUS.Value;
      &REC.PRICE_VNDR.Value = &PriceVndr;
      &REC.UNIT_PRC_TOL.Value = &RECITEM.UNIT_PRC_TOL.Value;
      &REC.EXT_PRC_TOL.Value = &RECITEM.EXT_PRC_TOL.Value;
      &REC.PCT_UNIT_PRC_TOL.Value = &RECITEM.PCT_UNIT_PRC_TOL.Value;
      &REC.PCT_EXT_PRC_TOL.Value = &RECITEM.PCT_EXT_PRC_TOL.Value;
      &REC.USE_STD_TOLERANCES.Value = &RECITEM.USE_STD_TOLERANCES.Value;
      &REC.QTY_RECV_TOL_PCT.Value = &RECITEM.QTY_RECV_TOL_PCT.Value;
      &REC.UNIT_PRC_TOL_L.Value = &RECITEM.UNIT_PRC_TOL_L.Value;
      &REC.PCT_UNIT_PRC_TOL_L.Value = &RECITEM.PCT_UNIT_PRC_TOL_L.Value;
      &REC.EXT_PRC_TOL_L.Value = &RECITEM.EXT_PRC_TOL_L.Value;
      &REC.PCT_EXT_PRC_TOL_L.Value = &RECITEM.PCT_EXT_PRC_TOL_L.Value;
      &REC.BU_PRICE_STATUS.Value = "2";
      &REC.STD_PRICE_STATUS.Value = "2";
      &REC.LEAD_TIME.Value = &RECITEM.LEAD_TIME.Value;
      &REC.OPRID_MODIFIED_BY.Value = &Oprid;
      &REC.LAST_DTTM_UPDATE.Value = &CurrentDateTime;
      &REC.PRICE_CHANGE.Value = &RECITEM.PRICE_CHANGE.Value;
      &REC.Insert();

   End-If;

   /* DR - 10/11/2018 - Added field ITEM_FIELD_C10_B (&ItmField) to CSV file layout and insert into PS_MASTER_ITEM_TBL (&MASTER_ITEM_TBL) */
   If None(&ItmField) Then;
      &Error = "Y";
      MessageBox(0, "", 0, 0, &VendorId | " " | &InvItemId | " " | &ItmIdVndr | " " | &UOM | " " | &ConvRate | " " | &PriceVndr | " " | &Effdt | " " | &ItmField);
   Else;
      SQLExec("UPDATE PS_MASTER_ITEM_TBL SET ITEM_FIELD_C10_B = :1 WHERE INV_ITEM_ID = :2 AND SETID = 'SHARE' ", &ItmField, &InvItemId);
      /* Else;
       &REC1 = CreateRecord(Record.MASTER_ITEM_TBL);
       &REC1.ITEM_FIELD_C10_B.Value = &ItmField;
       &REC1.SETID.Value = "SHARE";
       &REC1.INV_ITEM_ID.Value = &InvItemId;
       &REC1.Update();
    End-If;  */

   End-If;

End-While;
MessageBox(0, "", 0, 0, "**** END OF VALIDATION ERRORS ****");
MessageBox(0, "", 0, 0, " ");
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