title: Dapper DynamicParameters returning error
body: <p>I am currently using the latest version of dapper, version 1.50.0-beta9. The provider I am using for Oracle is the <code>Oracle.ManagedDataAccess</code>, version 12.1.2400.
  I am getting an error when using dapper's dynamic parameters. My code is similar to the example below:</p>
  
  <pre><code>public class PersonDAL : OracleBase {
  
      public PersonDAL() : base() {
      }
  
      public PersonDAL(string connectionString) : base(connectionString) {
      }
  
      public const string ParamPersonID = ":personid";
      public const string ParamClassID = ":classid";
      private const string getPersonByClassAndID = "SELECT PERSON_ID AS PersonID, PERSON_DESCRIPTION AS PersonDescription, CLASS_ID AS ClassID FROM TABLE_PERSON WHERE PERSON_ID = " + ParamPersonID + " AND CLASS_ID = " + ParamClassID;
  
      public SystemModel GetModelByPersonID_ClassID(int classID, int personid) {
          DynamicParameter = new DynamicParameters();
          DynamicParameter.Add(ParamClassID, classID);
          DynamicParameter.Add(ParamPersonID, personid);
          return Connection.QuerySingle&lt;SystemModel&gt;(getPersonByClassAndID, DynamicParameter);
      }
  }
  </code></pre>
  
  <p>This is returning this error:</p>
  
  <blockquote>
    <p>Invalid parameter binding<br>
    Parameter name: personidAND</p>
  </blockquote>