Execute SQL Alter commands for every session with Entity Framework 5 talking to Oracle 11g

Question

I have a requirement to execute some SQL commands at the start of every database session. I am using Entity Framework 5 via DbContext talking to a Oracle 11g database.

Answer 1

If anyone is reading this, no, the right way is doing it on connection open triggered down the line of:

public Entities()
    : base("name=Entities")
{        

    ctx.Database.Connection.StateChange += Connection_StateChange;
    ...
}

    private void Connection_StateChange(object sender, StateChangeEventArgs e)
    {
        if (e.OriginalState == ConnectionState.Open || e.CurrentState != ConnectionState.Open)
            return;

       this.Database.ExecuteSqlCommand("ALTER SESSION SET NLS_COMP=ANSI");

    }

Answer 2

The other option would be a "LOGON TRIGGER ON SCHEMA". But it's questionable whether you force DBA's to create it. Logon triggers are considered to be "dangerous".

Answer 3

you can use Database.Connection.StateChange method

    public AtomContext(string nameOrConnectionString)
        : base(nameOrConnectionString)
    {
        this.Database.Connection.StateChange += Connection_StateChange;
    }

    void Connection_StateChange(object sender, StateChangeEventArgs e)
    {
        if (e.OriginalState == ConnectionState.Open || e.CurrentState != ConnectionState.Open)
            return;

        IDbConnection connection = ((EntityConnection)((IObjectContextAdapter)this).ObjectContext.Connection).StoreConnection;
        using (IDbCommand command = connection.CreateCommand("ALTER SESSION SET NLS_LANGUAGE=TURKISH"))
            command.ExecuteNonQuery();

        using (IDbCommand command = connection.CreateCommand("ALTER SESSION SET NLS_COMP = LINGUISTIC"))
            command.ExecuteNonQuery();

        using (IDbCommand command = connection.CreateCommand("ALTER SESSION SET NLS_SORT=TURKISH_AI"))
            command.ExecuteNonQuery();
    }

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