Oracle Data Provider for .NET classes and APIs provide data access to the Oracle Database from a .NET client application and from .NET stored procedures and functions.

However, some limitations and restrictions exist when Oracle Data Provider for .NET is used within a .NET stored procedure. These are discussed in the next section.

The following is a simple .NET stored procedure example.

using System;
using Oracle.DataAccess.Client;
using Oracle.DataAccess.Types;
 
public class CLRLibrary1
{
  // .NET Stored Function returning the DEPTNO of the employee whose
  // EMPNO is 'empno'
  public static uint GetDeptNo(uint empno)
  {
    uint deptno = 0;
 
    // Create and open a context connection
    OracleConnection conn = new OracleConnection();
    if( OracleConnection.IsAvailable == true )
    {
      conn.ConnectionString = "context connection=true";
    }
    else
    {
      //set connection string for a normal client connection
      conn.ConnectionString = "user id=scott;password=tiger;" +
        "data source=oracle";
    } 
    conn.Open();
 
    // Create and execute a command
    OracleCommand cmd = conn.CreateCommand();
    cmd.CommandText = "SELECT DEPTNO FROM EMP WHERE EMPNO = :1";
    cmd.Parameters.Add(":1",OracleDbType.Int32,empno,
    System.Data.ParameterDirection.Input);
    OracleDataReader rdr = cmd.ExecuteReader();
    if (rdr.Read())
      deptno = (uint)rdr.GetInt32(0);
    rdr.Close();
    cmd.Dispose();
    conn.Close();
    return deptno;
  } // GetDeptNo
} // CLRLibrary1