Using Dapper with Oracle stored procedures which return cursors

Question

How would one go about using Dapper with Oracle stored procedures which return cursors?

var p = new DynamicParameters();
p.Add("foo", "bar");
p.Add("baz_cursor", dbType: DbType.? , direction: ParameterDirection.Output);

Here, the DbType is System.Data.DbType which does not have a Cursor member. I've tried using DbType.Object but that does not work with both OracleClient and OracleDataAcess.

What would be a possible way to use OracleType or OracleDbType instead?

Answer 1

Thanks for the solution here. I achieved the same thing with a little less code using a simple DynamicParameter decorator:

public class OracleDynamicParameters : SqlMapper.IDynamicParameters
{
    private readonly DynamicParameters dynamicParameters = new DynamicParameters();

    private readonly List<OracleParameter> oracleParameters = new List<OracleParameter>();

    public void Add(string name, object value = null, DbType? dbType = null, ParameterDirection? direction = null, int? size = null)
    {
        dynamicParameters.Add(name, value, dbType, direction, size);
    }

    public void Add(string name, OracleDbType oracleDbType, ParameterDirection direction)
    {
        var oracleParameter = new OracleParameter(name, oracleDbType, direction);
        oracleParameters.Add(oracleParameter);
    }

    public void AddParameters(IDbCommand command, SqlMapper.Identity identity)
    {
        ((SqlMapper.IDynamicParameters)dynamicParameters).AddParameters(command, identity);

        var oracleCommand = command as OracleCommand;

        if (oracleCommand != null)
        {
            oracleCommand.Parameters.AddRange(oracleParameters.ToArray());
        }
    }
}

Answer 2

You would have to implement:

 public interface IDynamicParameters
 {
    void AddParameters(IDbCommand command, Identity identity);
 }

Then in the AddParameters callback you would cast the IDbCommand to an OracleCommand and add the DB specific params.

Answer 3

Add this class to your project

and your code should like below :-

        var p = new OracleDynamicParameters();
        p.Add("param1", pAuditType);
        p.Add("param2", pCommnId);
        p.Add("outCursor", dbType: OracleDbType.RefCursor, direction: ParameterDirection.Output);

        using (var multi = cnn.QueryMultiple("procedure_name", param: p, commandType: CommandType.StoredProcedure))
        {
            var data = multi.Read();
            return data;
        }