Forward Mapping with another database

[Srinivas Chitta]

Hi,

I am using Reverse Mapping for a database created in SQL Server. I have created a DLL for this Data Access Layer component. Everything is going fine. On one fine day, I thought of changing the database to Oracle. Now, without using my existing code for Data Access Layer and by using the generated  DLL, can i run forward mapping to change my database from SQL Server to Oracle?

Waiting for your quick reply.


Thanks
Srinivas

[Ady]

Hello Srinivas Chitta,

 Yes, you can use the same generated DLL and forward map your classes to an Oracle db.
Here's how you can do it

1. Create a copy of the connection node in the app.config and specify the setting for the oracle backend
2. Add a 'backendconfiguration' node under the 'backendconfigurations' node. Both the connections should resolve to the same mapping node.

Here is an example of how the <openaccess> node should look like

<openaccess xmlns="http://www.telerik.com/OpenAccess">
    <references />
    <connections>
      <connection id="DatabaseConnectionMssql">
        <databasename>Northwind</databasename>
        <servername>(local)\SQLEXPRESS</servername>
        <integratedSecurity>True</integratedSecurity>
        <backendconfigurationname>mssqlConfiguration</backendconfigurationname>
      </connection>
      <connection id="DatabaseConnectionOracle">
        <databasename>databasename</databasename>
        <servername>servername</servername>
        <user>user</user>
        <password>password</password>
        <backendconfigurationname>oracleConfiguration</backendconfigurationname>
      </connection>
    </connections>
    <backendconfigurations>
      <backendconfiguration id="mssqlConfiguration" backend="mssql">
        <mappingname>commonMapping</mappingname>
      </backendconfiguration>
      <backendconfiguration id="oracleConfiguration" backend="oracle">
        <mappingname>commonMapping</mappingname>
      </backendconfiguration>
    </backendconfigurations>
    <mappings current="commonMapping">
      <mapping id="commonMapping" />
    </mappings>
  </openaccess>
 
Here we have 2 connection nodes - 1 for each backend. Both point to their own 'backendconfiguration nodes - mssqlConfiguration and oracleConfiguration. These configurations point to a common mapping node - 'commonMapping.

 You can switch between the 2 backends using the connection id. You will need to remove/comment out the <extension key="db-do-not-create-table" value="true" /> node for each table so that the table gets created for oracle.

 Do get back to us in case you need further assitance.

Best wishes,
Ady
the Telerik team

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[Srinivas Chitta]

Hi,

I could not find the solution to my problem in the given reply. Let me be clear in my question. The scenario is this:

When we are deploying our application at a client's place, should we create the database manually in the server or will open access automatically create the database in the server based on the connection details provided in the web.config and schema from the DAL.

Waiting for your immediate reply...

Thanks and Regards,
Srinivas

[Ady]

Hi Srinivas Chitta,

 As mentioned in my other reply, this is possible using the SchemaHandler api.You can use the API to check the existing database and calculate a SQL script necessary to create/migrate the database to match the existing classless' requirements.

 Hope this helps.

Sincerely yours,
Ady
the Telerik team

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