Entity Framework - Code First - Migration - How to access SQL Server and Oracle using the same context?

Hello,
I use Entity Framework code first approach.
My project is working fine with SQL Server. But, I want to access Oracle too. I want to switch SQL Server and Oracle in run time.
I am able to access Oracle using "Oracle.ManagedDataAccess.EntityFramework.dl" in a new project.
But, Is this possible to access SQL Server and Oracle in the same project.
Thanks,
Murugan

This should be possible with a Code-First workflow. In Code-First the database mapping layer is generated at runtime.
David
David http://blogs.msdn.com/b/dbrowne/

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How to access SQL server in oracle running in aix unix?

Hi all,
I have oracle database running in IBM AIX OS, and I need to query data in
SQL SERVER 2000.
How to do that?
Is there free Sqlserver ODBC drivers for unix?
Thanks

Hi,
I prefer heterogenous services over ODBC for this!
I have my notes here, which may help.
http://www.dba-oracle.com/t_heterogeneous_database_connections_sql_server.htm
1. Install Oracle ODBC drivers on the server (your local Oracle database) that will access the remote SQL Server database using the database link.
2. Setup the ODBC connection on the local Oracle database using the Windows ODBC Data Source Administrator
3. Test the ODBC drivers to ensure that connectivity is made to the SQL Server database.
4. Ensure that your global_names parameter is set to False.
5. Configure the Oracle Heterogeneous services by creating an initodbc.ora file within the Oracle database.
7. Modify the Listener.ora file.
SID_NAME is the DSN for the remote database.
ORACLE_HOME is the actual Oracle home file path.
PROGRAM tells Oracle to use heterogeneous services.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME=Cas30C) -- Enter the DSN on this line
(ORACLE_HOME = c:\oracle10gdb) -- Enter your Oracle home on this line
(PROGRAM = hsodbc) ) )
8. Modify the Tnsnames.ora file. This is the Oracle database installation accessed by the users to connect to the ODBC drivers
(DESCRIPTION=
(ADDRESS_LIST=
(Address=(PROTOCOL=TCP)
(HOST=
-- (Server x)
(PORT=1521))) -- Enter the port on which the server x Oracle installation
-- is listening
(CONNECT_DATA=(SID=Cas30c)) - Enter the DSN name
(HS=OK) -- Enter this value. It tells Oracle to use hetergeneous services
9. Reload the listener on local Oracle database
10. Create a database link on the local Oracle installation that accesses the heterogeneous connection, which, in turn, connect to SQL Server.
11. Run a SQL Server Select statement from the Oracle installation using the database link.
Hope this helps. . .
Don Burleson
Oracle Press author
Author of “Oracle Tuning: The Definitive Reference”
http://www.dba-oracle.com/bp/s_oracle_tuning_book.htm

Accessing SQL Server from ORACLE using Transparent Gateway

So I had downloaded the gateway installer and was following the guide here to set up the Transparent Gateway for SQL Server: http://www.orafusion.com/art_orahs.htm
After I had created the database link, I was prompted the following error when trying to do a simple select statement from the SQL Server DB:
>
ORA-12154: TNS:could not resolve service name
12154. 00000 - "TNS:could not resolve the connect identifier specified"
*Cause:    A connection to a database or other service was requested using
a connect identifier, and the connect identifier specified could not
be resolved into a connect descriptor using one of the naming methods
configured. For example, if the type of connect identifier used was a
net service name then the net service name could not be found in a
naming method repository, or the repository could not be
located or reached.
*Action:
- If you are using local naming (TNSNAMES.ORA file):
- Make sure that "TNSNAMES" is listed as one of the values of the
NAMES.DIRECTORY_PATH parameter in the Oracle Net profile
(SQLNET.ORA)
- Verify that a TNSNAMES.ORA file exists and is in the proper
directory and is accessible.
- Check that the net service name used as the connect identifier
exists in the TNSNAMES.ORA file.
- Make sure there are no syntax errors anywhere in the TNSNAMES.ORA
file. Look for unmatched parentheses or stray characters. Errors
in a TNSNAMES.ORA file may make it unusable.
- If you are using directory naming:
- Verify that "LDAP" is listed as one of the values of the
NAMES.DIRETORY_PATH parameter in the Oracle Net profile
(SQLNET.ORA).
- Verify that the LDAP directory server is up and that it is
accessible.
- Verify that the net service name or database name used as the
connect identifier is configured in the directory.
- Verify that the default context being used is correct by
specifying a fully qualified net service name or a full LDAP DN
as the connect identifier
- If you are using easy connect naming:
- Verify that "EZCONNECT" is listed as one of the values of the
NAMES.DIRETORY_PATH parameter in the Oracle Net profile
(SQLNET.ORA).
- Make sure the host, port and service name specified
are correct.
- Try enclosing the connect identifier in quote marks.
Error at Line: 3 Column: 27
>
Here are my configuration files:
initMSQL.ora
>
HS_FDS_CONNECT_INFO=webdatasvr:1433.InfoWeb
HS_FDS_TRACE_LEVEL=OFF
HS_FDS_RECOVERY_ACCOUNT=RECOVER
HS_FDS_RECOVERY_PWD=RECOVER
>
listener.ora
>
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC=
(GLOBAL_DBNAME=UGCMAC)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
(SID_NAME=UGCMAC)
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)
(SID_DESC =
(SID_NAME = MSQL)
(ORACLE_HOME = C:\oracle\product\11.2.0\tg_1)
(PROGRAM = dg4msql)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(ADDRESS LIST=
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1524))
>
tnsname.ora
>
UGCMAC =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = UGCMAC)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
MSQL=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1524))
(CONNECT_DATA =
(SID = MSQL)
(HS=OK)
>
Can anyone assist me? thanks!

Hi kgronau,
>
After changing a listener.ora file you need to STOP and START the listener to get the changes loaded. It looks like your listener is not serving the 1524 port which could be related to the fact that you didn't stop/start the listener after you've edited the listener.ora file.
... But as stated earlier - please do not use a 10.2 listener to start an 11g gateway. Instead configure the listener of the gateway home.
>
I did restart my listener under services.msc whenever I make the changes but there are no effect. Please also note that I can only find "OracleOraDb10g_home1TNSListener" under my services.msc. There is no 11.2 Listener. I did install the gateway and the installation was successful as far as I can tell. But perhaps because there's no 11.2 Listerner under my services.msc, could that mean it was a bad installation?
>
Next point is the tnsping you've used is 11.2. You need to make sure that you use the tnsping of the Oracle Database home as the database initiates the gateway connection so the database home tnsnames,ora needs the tns entry for the gateway.
>
My current PATH environment variables setting is as follow: C:\oracle\product\11.2.0\tg_1\bin;C:\oracle\product\10.2.0\db_1\bin; So perhaps, I just need to ensure the 10.2 ORACE home is the first?
>
As a final tip: There are so many web sites explaining how to configure DG4ODBC - many of them are faulty. If you need a reliable configuration, please have a look at "My Oracle Support" => How to Configure DG4ODBC (Oracle Database Gateway for ODBC) on Windows 32bit to Connect to Non-Oracle Databases Post Install     [Document 466225.1]     )
>
Is there a link?
Edited by: omnri on 21-Jul-2011 23:59

Entity framework code first inheritance table per type problem

hello
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SELECT
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"Extent1"."START_DATE" AS "START_DATE",
"Extent1"."END_DATE" AS "END_DATE",
"Extent1"."NAME" AS "NAME",
"Extent1"."TYPE_CODE" AS "TYPE_CODE",
CAST( "Extent1"."CREATE_USER_ID" AS number(10,0)) AS "C3",
"Extent1"."CREATE_DATE" AS "CREATE_DATE",
CAST( "Extent1"."MODIFY_USER_ID" AS number(10,0)) AS "C4",
"Extent1"."MODIFY_DATE" AS "MODIFY_DATE",
CASE WHEN (( NOT (("Project1"."C2" = 1) AND ("Project1"."C2" IS NOT NULL))) AND ( NOT (("Project2"."C2" = 1) AND ("Project2"."C2" IS NOT NULL)))) THEN NULL WHEN (("Project1"."C2" = 1) AND ("Project1"."C2" IS NOT NULL)) THEN "Project1"."QUARTER_NAME" END AS "C5"
FROM "DBO_SPACE_DEV"."S_PERIOD" "Extent1"
LEFT OUTER JOIN (SELECT
     "Extent2"."QUARTER_NAME" AS "QUARTER_NAME",
     CAST( "Extent2"."QUARTER_ID" AS number(10,0)) AS "C1",
     1 AS "C2"
     FROM "DBO_SPACE_DEV"."S_SEASON_QUARTER" "Extent2" ) "Project1" ON ( CAST( "Extent1"."PERIOD_ID" AS number(10,0))) = "Project1"."C1"
LEFT OUTER JOIN (SELECT
     CAST( "Extent3"."PRICE_PERIOD_ID" AS number(10,0)) AS "C1",
     1 AS "C2"
     FROM "DBO_SPACE_DEV"."S_SEASON_PRICE_PERIOD" "Extent3" ) "Project2" ON ( CAST( "Extent1"."PERIOD_ID" AS number(10,0))) = "Project2"."C1"
Edited by: 997830 on Apr 3, 2013 8:40 AM

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Entity Framework - Code First - Migration - How to access SQL Server and Oracle using the same context?

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