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Working with OracleTypes 

The .NET Framework Data Provider for Oracle includes several structures you can use to work with Oracle data types. These include OracleNumber and OracleString.

NoteNote

For a complete list of these structures, see System.Data.OracleClient.

The following C# examples:

  • Create an Oracle table and load it with data.

  • Use an OracleDataReader to access the data, and use several OracleType structures to display the data.

Creating an Oracle Table

This example creates an Oracle table and loads it with data. You must run this example before running the next example.

public void Setup(string connectionString)
   {
   OracleConnection conn = new OracleConnection(connectionString);
   try
      {
      conn.Open();
      OracleCommand cmd = conn.CreateCommand();
      cmd.CommandText ="CREATE TABLE OracleTypesTable " +
        "(MyVarchar2 varchar2(3000),MyNumber number(28,4) " +
        "PRIMARY KEY ,MyDate date, MyRaw raw(255))";
      cmd.ExecuteNonQuery();
      cmd.CommandText ="INSERT INTO OracleTypesTable VALUES " +
        "( 'test', 2, to_date('2000-01-11 12:54:01','yyyy-mm-dd " +
        "hh24:mi:ss'), '0001020304' )";
      cmd.ExecuteNonQuery();
      }
   catch(Exception)
   {
   }
   finally
   {
      conn.Close();
   }
}

Retrieving Data from the Oracle Table

This example uses an OracleDataReader to access the data, and uses several OracleType structures to display the data.

public void ReadOracleTypesExample(string connectionString)
   {
   OracleConnection myConnection = 
      new OracleConnection(connectionString);
   myConnection.Open();
   OracleCommand myCommand = myConnection.CreateCommand();

   try
      {
      myCommand.CommandText = "SELECT * from OracleTypesTable";
      OracleDataReader oracledatareader1 = myCommand.ExecuteReader();
      oracledatareader1.Read();

      //Using the oracle specific getters for each type is faster than
      //using GetOracleValue.

      //First column, MyVarchar2, is a VARCHAR2 data type in Oracle
      //Server and maps to OracleString.
      OracleString oraclestring1 = 
        oracledatareader1.GetOracleString(0);
      Console.WriteLine("OracleString " + oraclestring1.ToString());

      //Second column, MyNumber, is a NUMBER data type in Oracle Server
      //and maps to OracleNumber.
      OracleNumber oraclenumber1 = 
        oracledatareader1.GetOracleNumber(1);
      Console.WriteLine("OracleNumber " + oraclenumber1.ToString());

      //Third column, MyDate, is a DATA data type in Oracle Server
      //and maps to OracleDateTime.
      OracleDateTime oracledatetime1 = 
        oracledatareader1.GetOracleDateTime(2);
      Console.WriteLine("OracleDateTime " + oracledatetime1.ToString());

      //Fourth column, MyRaw, is a RAW data type in Oracle Server and
      //maps to OracleBinary.
      OracleBinary oraclebinary1 = 
        oracledatareader1.GetOracleBinary(3);
      //Calling value on a null OracleBinary throws
      //OracleNullValueException; therefore, check for a null value.
      if (oraclebinary1.IsNull==false)
      {
         foreach(byte b in oraclebinary1.Value)
         {
            Console.WriteLine("byte " + b.ToString());
         }
      }
      oracledatareader1.Close();
   }
   catch(Exception e)
   {
       Console.WriteLine(e.ToString());
   }
   finally
   {
       myConnection.Close();
   }
}

See Also

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