2 views generated from 1 Sqlserver view; associated trigger is on the 2nd v

Question

I am getting mystifying results after my Sqlserver to Oracle conversion (which gave no errors). When the application runs against the Oracle database, it gives errors on attempts to insert into a view. We make heavy use of INSTEAD OF triggers to insert into views which are JOINs of several other tables. (We do a lot of subtyping where the common stuff lives in one table, and the data specific to different subtypes lives in lower-level tables, sometimes 3 or 4 levels deep). So we insert into views which are joins of the tables at all the necessary levels, with the PK at all levels having the same value.
Here's an eg. of our lookup code tables: The top table is tDbobjects, which contains fields like 'entered by', created date, etc.
                         Next level down is tLookupObjects, which contains fields like 'french desc', 'english desc'
                         Bottom level is tRaceTypes, which contains (at a minimum), 'code value'
So, the RaceTypes view contains all the fields from the 3 tables, via a join of tDbobjects, TlookupObjects, TRaceTypes, where the PK of all 3 is the same.
And, there's an Instead Of trigger on the RaceTypes view for insert. (named RaceTypesInsert)
But, after running the db thru Sql Workbench,
2 views are created for each Sqlserver view. The first (RaceTypes) matches the original Sqlserver view RaceTypes; the 2nd is a select from the 1st view, and is named RaceTypes_vw
The RaceTypesInsert trigger is created against the RaceTypes_vw view, not the RaceTypes view.
This causes all kinds of trouble with the app, which was written against the Sqlserver db, and knows nothing about views with the '_vw' suffix.
Our whole development effort revolves around the ability to develop against Sqlserver, run the db thru the Workbench conversion to Oracle, and run the app against Oracle.
Help!
Here's the text of the file that I don't know how to attach: it's the create scripts for tables, views, triggers:
SQLSERVER DATABASE OBJECTS
-- tables
-- TDBOBJECTS
CREATE TABLE [dbo].[tDbObjects](
     [Id] [uniqueidentifier] ROWGUIDCOL NOT NULL,
     [DisplayText] [varchar](200) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
     [CreatedDate] [datetime] NULL,
     [ModifiedDate] [datetime] NULL,
     [EnteredBy] [uniqueidentifier] NULL,
     [ModifiedBy] [uniqueidentifier] NULL,
     [LegacyFlag] [numeric](1, 0) NULL,
PRIMARY KEY CLUSTERED
     [Id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
-- TLOOKUPOBJECTS
CREATE TABLE [dbo].[tLookupObjects](
     [Id] [uniqueidentifier] ROWGUIDCOL NOT NULL,
     [DescriptionEn] [varchar](240) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
     [DescriptionFr] [varchar](240) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
     [EffectiveDate] [datetime] NOT NULL,
     [ExpiryDate] [datetime] NULL,
     [CurrentFlag] [numeric](1, 0) NOT NULL,
PRIMARY KEY CLUSTERED
     [Id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
-- TRACETYPES
CREATE TABLE [dbo].[tRaceTypes](
     [Id] [uniqueidentifier] ROWGUIDCOL NOT NULL,
     [Migration_RACE_CODE] [varchar](6) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
PRIMARY KEY CLUSTERED
     [Id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
-- views
-- DBOBJECTS
CREATE VIEW [dbo].[DbObjects] ( [Id], [DisplayText], [CreatedDate], [ModifiedDate], [EnteredBy], [ModifiedBy], [LegacyFlag]) AS
SELECT tDbObjects.[Id], tDbObjects.[DisplayText], tDbObjects.[CreatedDate], tDbObjects.[ModifiedDate], tDbObjects.[EnteredBy], tDbObjects.[ModifiedBy], tDbObjects.[LegacyFlag]
FROM tDbObjects
-- LOOKUPOBJECTS
CREATE VIEW [dbo].[LookupObjects] ( [Id], [DisplayText], [CreatedDate], [ModifiedDate], [EnteredBy], [ModifiedBy], [LegacyFlag], [DescriptionEn], [DescriptionFr], [EffectiveDate], [ExpiryDate], [CurrentFlag]) AS
SELECT DbObjects.[Id], DbObjects.[DisplayText], DbObjects.[CreatedDate], DbObjects.[ModifiedDate], DbObjects.[EnteredBy], DbObjects.[ModifiedBy], DbObjects.[LegacyFlag], tLookupObjects.[DescriptionEn], tLookupObjects.[DescriptionFr], tLookupObjects.[EffectiveDate], tLookupObjects.[ExpiryDate], tLookupObjects.[CurrentFlag]
FROM tLookupObjects JOIN DbObjects ON tLookupObjects.Id = DbObjects.Id
-- RACETYPES
CREATE VIEW [dbo].[RaceTypes] ( [Id], [DisplayText], [CreatedDate], [ModifiedDate], [EnteredBy], [ModifiedBy], [LegacyFlag], [DescriptionEn], [DescriptionFr], [EffectiveDate], [ExpiryDate], [CurrentFlag], [Migration_RACE_CODE]) AS
SELECT LookupObjects.[Id], LookupObjects.[DisplayText], LookupObjects.[CreatedDate], LookupObjects.[ModifiedDate], LookupObjects.[EnteredBy], LookupObjects.[ModifiedBy], LookupObjects.[LegacyFlag], LookupObjects.[DescriptionEn], LookupObjects.[DescriptionFr], LookupObjects.[EffectiveDate], LookupObjects.[ExpiryDate], LookupObjects.[CurrentFlag], tRaceTypes.[Migration_RACE_CODE]
FROM tRaceTypes JOIN LookupObjects ON tRaceTypes.Id = LookupObjects.Id
-- TRIGGER ON RACETYPES
CREATE TRIGGER [RaceTypesInsert] ON [dbo].[RaceTypes] INSTEAD OF INSERT AS
IF NOT EXISTS(SELECT * FROM LookupObjects WHERE Id in (SELECT Id FROM Inserted )) INSERT INTO LookupObjects( [Id], [DisplayText], [CreatedDate], [ModifiedDate], [EnteredBy], [ModifiedBy], [LegacyFlag], [DescriptionEn], [DescriptionFr], [EffectiveDate], [ExpiryDate], [CurrentFlag])
SELECT [Id], [DisplayText], [CreatedDate], [ModifiedDate], [EnteredBy], [ModifiedBy], [LegacyFlag], [DescriptionEn], [DescriptionFr], [EffectiveDate], [ExpiryDate], [CurrentFlag]
FROM INSERTED
INSERT INTO tRaceTypes ([Id], [Migration_RACE_CODE])
SELECT [Id], [Migration_RACE_CODE]
FROM INSERTED
if exists( select * from DbClasses where DisplayText = 'RaceTypes') insert into tDbObjectDbClass( id, DbObject, DbClass) select newid(), Id, (select id from DbClasses where DisplayText = 'RaceTypes') from INSERTED
--------------- ORACLE DB, AFTER CONVERSION ---------------------
-- TABLES
-- TDBOBJECTS
CREATE TABLE "CP_D"."TDBOBJECTS"
(     "ID" CHAR(36 CHAR) NOT NULL ENABLE,
     "DISPLAYTEXT" VARCHAR2(200 CHAR) NOT NULL ENABLE,
     "CREATEDDATE" DATE,
     "MODIFIEDDATE" DATE,
     "ENTEREDBY" CHAR(36 CHAR),
     "MODIFIEDBY" CHAR(36 CHAR),
     "LEGACYFLAG" NUMBER(1,0),
     CONSTRAINT "PK_TDBOBJECTS_34C8D9D1" PRIMARY KEY ("ID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "CPD_DATA" ENABLE
) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "CPD_DATA" ;
-- TLOOKUPOBJECTS
CREATE TABLE "CP_D"."TLOOKUPOBJECTS"
(     "ID" CHAR(36 CHAR) NOT NULL ENABLE,
     "DESCRIPTIONEN" VARCHAR2(240 CHAR) NOT NULL ENABLE,
     "DESCRIPTIONFR" VARCHAR2(240 CHAR) NOT NULL ENABLE,
     "EFFECTIVEDATE" DATE NOT NULL ENABLE,
     "EXPIRYDATE" DATE,
     "CURRENTFLAG" NUMBER(1,0) NOT NULL ENABLE,
     CONSTRAINT "PK_TLOOKUPOBJECTS_5AEE82B9" PRIMARY KEY ("ID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "CPD_DATA" ENABLE,
     CONSTRAINT "FK_TLOOKUPOBJEC_ID_251C81ED" FOREIGN KEY ("ID")
     REFERENCES "CP_D"."TDBOBJECTS" ("ID") ENABLE
) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "CPD_DATA" ;
-- TRACETYPES
CREATE TABLE "CP_D"."TRACETYPES"
(     "ID" CHAR(36 CHAR) NOT NULL ENABLE,
     "MIGRATION_RACE_CODE" VARCHAR2(6 CHAR),
     CONSTRAINT "PK_TRACETYPES_1F98B2C1" PRIMARY KEY ("ID")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "CPD_DATA" ENABLE,
     CONSTRAINT "FK_TRACETYPES_ID_7073AF84" FOREIGN KEY ("ID")
     REFERENCES "CP_D"."TLOOKUPOBJECTS" ("ID") ENABLE
) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "CPD_DATA" ;
-- VIEWS (only RACETYPES / RACETYPES_VW INCLUDED HERE)
-- RACETYPES
CREATE OR REPLACE FORCE VIEW "CP_D"."RACETYPES" ("ID", "DISPLAYTEXT", "CREATEDDATE", "MODIFIEDDATE", "ENTEREDBY", "MODIFIEDBY", "LEGACYFLAG", "DESCRIPTIONEN", "DESCRIPTIONFR", "EFFECTIVEDATE", "EXPIRYDATE", "CURRENTFLAG", "MIGRATION_RACE_CODE") AS
SELECT LookupObjects.Id,
LookupObjects.DisplayText,
LookupObjects.CreatedDate,
LookupObjects.ModifiedDate,
LookupObjects.EnteredBy,
LookupObjects.ModifiedBy,
LookupObjects.LegacyFlag,
LookupObjects.DescriptionEn,
LookupObjects.DescriptionFr,
LookupObjects.EffectiveDate,
LookupObjects.ExpiryDate,
LookupObjects.CurrentFlag,
tRaceTypes.Migration_RACE_CODE
FROM tRaceTypes
JOIN LookupObjects
ON tRaceTypes.Id = LookupObjects.Id;
-- RACETYPES_VW
CREATE OR REPLACE FORCE VIEW "CP_D"."RACETYPES_VW" ("ID", "DISPLAYTEXT", "CREATEDDATE", "MODIFIEDDATE", "ENTEREDBY", "MODIFIEDBY", "LEGACYFLAG", "DESCRIPTIONEN", "DESCRIPTIONFR", "EFFECTIVEDATE", "EXPIRYDATE", "CURRENTFLAG", "MIGRATION_RACE_CODE") AS
SELECT "ID","DISPLAYTEXT","CREATEDDATE","MODIFIEDDATE","ENTEREDBY","MODIFIEDBY","LEGACYFLAG","DESCRIPTIONEN","DESCRIPTIONFR","EFFECTIVEDATE","EXPIRYDATE","CURRENTFLAG","MIGRATION_RACE_CODE" FROM RaceTypes;
-- TRIGGERS
-- RACETYPESINSERT
CREATE OR REPLACE TRIGGER "CP_D"."RACETYPESINSERT"
INSTEAD OF INSERT
ON RaceTypes_vw
DECLARE
v_temp NUMBER(1, 0) := 0;
BEGIN
BEGIN
SELECT 1 INTO v_temp
FROM DUAL
WHERE NOT EXISTS ( SELECT *
FROM LookupObjects
WHERE Id IN ( SELECT :NEW.Id
FROM DUAL ) );
EXCEPTION
WHEN OTHERS THEN
NULL;
END;
IF v_temp = 1 THEN
INSERT INTO LookupObjects
( Id, DisplayText, CreatedDate, ModifiedDate, EnteredBy, ModifiedBy, LegacyFlag, DescriptionEn, DescriptionFr, EffectiveDate, ExpiryDate, CurrentFlag )
VALUES ( :NEW.Id, :NEW.DisplayText, :NEW.CreatedDate, :NEW.ModifiedDate, :NEW.EnteredBy, :NEW.ModifiedBy, :NEW.LegacyFlag, :NEW.DescriptionEn, :NEW.DescriptionFr, :NEW.EffectiveDate, :NEW.ExpiryDate, :NEW.CurrentFlag );
END IF;
INSERT INTO tRaceTypes
( Id, Migration_RACE_CODE )
VALUES ( :NEW.Id, :NEW.Migration_RACE_CODE );
BEGIN
SELECT 1 INTO v_temp
FROM DUAL
WHERE EXISTS ( SELECT *
FROM DbClasses
WHERE DisplayText = 'RaceTypes' );
EXCEPTION
WHEN OTHERS THEN
NULL;
END;
IF v_temp = 1 THEN
INSERT INTO tDbObjectDbClass
( id, DbObject, DbClass )
VALUES ( SYS_GUID(), :NEW.Id, ( SELECT id
FROM DbClasses
WHERE DisplayText = 'RaceTypes' ) );
END IF;
END;

Answer 1

Can you tell me more info? Why are 2 views generated? Is the '_vw' view is generated because of the Instead Of trigger? (It looks like it -- it's part of the ddl file that generates the trigger)
     Manual mods aren't really a viable workaround -- we have over 100 views, plus delete and update triggers, which also suffer from this problem.