How to save unicode data to oracle?

Question

I am trying to save unicode data (greek) in oracle database (10 g). I have created a simple table:

I understand that NVARCHAR2 always uses UTF-16 encoding

Answer 1

After some investigations here we go:

string input = "•"; char s = input[0];

       //table kuuku with column kuku(nvarchar2(100))
        string connString = "your connection";

        //CLEAN TABLE
        using (System.Data.OracleClient.OracleConnection cn = new System.Data.OracleClient.OracleConnection(connString))
        {
            cn.Open();
            System.Data.OracleClient.OracleCommand cmd = new System.Data.OracleClient.OracleCommand("delete from  kuku ", cn);
            cmd.ExecuteNonQuery();
            cn.Close();
        }


        //INSERT WITH PARAMETER BINDING - UNICODE SAVED
        using (System.Data.OracleClient.OracleConnection cn = new System.Data.OracleClient.OracleConnection(connString))
        {
            cn.Open();
            System.Data.OracleClient.OracleCommand cmd = new System.Data.OracleClient.OracleCommand("insert into  kuku (kuku) values(:UnicodeString)", cn);
            cmd.Parameters.Add(":UnicodeString", System.Data.OracleClient.OracleType.NVarChar).Value = input + " OK" ;
            cmd.ExecuteNonQuery();
            cn.Close();
        }

        //INSERT WITHOUT PARAMETER BINDING - UNICODE NOT SAVED
        using (System.Data.OracleClient.OracleConnection cn = new System.Data.OracleClient.OracleConnection(connString))
        {
            cn.Open();
            System.Data.OracleClient.OracleCommand cmd = new System.Data.OracleClient.OracleCommand("insert into  kuku (kuku) values('" +input+" WRONG')", cn);
            cmd.ExecuteNonQuery();
            cn.Close();
        }
        //FETCH RESULT
        using (System.Data.OracleClient.OracleConnection cn = new System.Data.OracleClient.OracleConnection(connString))
        {
            cn.Open();
            System.Data.OracleClient.OracleCommand cmd = new System.Data.OracleClient.OracleCommand("select kuku from kuku", cn);
            System.Data.OracleClient.OracleDataReader dr = cmd.ExecuteReader();
            if(dr.Read())
            {
                string output = (string) dr[0];
                char sa = output[0];
            }
            cn.Close();
        }
    }