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POReturning multiple ref cursors from Oracle Procedure using DAAB & C#
 

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  1. POReturning multiple ref cursors from Oracle Procedure using DAAB & C#
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    <p>I want to return data from an Oracle procedure to populate some Label controls. The procedure accepts 26 input parameters (search variable) and returns 3 output cursors. I have been successful returning data from a procedure which returns a single ref cursor using OracleCommand, a DataAdapter, and a DataSet, but have been having all kinds of issues returning data from a procedure returning multiple ref cursors.</p> <p>I was trying to use DAAB from the Enterprise Library, but had no success (original post). I now have gone back to an OracleCommand based off posts from Oracle and other dev sites. I am still returning zero rows. I can return the column names from my readers using "rdr_p_cursor_detail.GetName(0);", but When I try to return a value I get a "Operation is not valid due to the current state of the object." error. </p> <pre><code> //Open the connection to Oracle. OracleConnection cn = new OracleConnection(ConfigurationHelper.ConnectionStringSlabProcedures); OracleCommand cmd = new OracleCommand(); cn.Open(); cmd.Connection = cn; try { //Set the command text (SQL) of the Oracle command to the stored procedure "getSlab", which returns slab details. cmd.CommandText = ConfigurationHelper.ProcuedurePackageSchema + "." + ConfigurationHelper.ProcuedurePackageName + "." + "getSlab"; //...and specify the command as a stored procedure. cmd.CommandType = CommandType.StoredProcedure; //Add the input and output parameters. cmd.Parameters.Add("rb_category", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("rb_category_value", OracleDbType.Varchar2).Value = slabID; cmd.Parameters.Add("rb_type ", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("rb_chem_value", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_inside_only", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_appl_pending", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_appl_soft_approved", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_appl_hard_approved", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_appl_mechanically", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_as_cast", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_as_dispoed", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_chem_match", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_near_match", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("txt_width_min", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_width_max", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_quality_min", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_quality_max", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_days_old_min", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_days_old_max", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_days_rev_min", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_days_rev_max", OracleDbType.Int32).Value = 0; cmd.Parameters.Add("txt_reviewer", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_excl_hr", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_excl_cr", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_excl_galv", OracleDbType.Varchar2).Value = string.Empty; cmd.Parameters.Add("cb_excl_tin", OracleDbType.Varchar2).Value = string.Empty; //Add the ref-cursors as output parameters OracleParameter p_cursor_detail = cmd.Parameters.Add("p_cursor_detail", OracleDbType.RefCursor); p_cursor_detail.Direction = ParameterDirection.Output; OracleParameter p_cursor_comments = cmd.Parameters.Add("p_cursor_comments", OracleDbType.RefCursor); p_cursor_comments.Direction = ParameterDirection.Output; OracleParameter p_cursor_grades = cmd.Parameters.Add("p_cursor_grades", OracleDbType.RefCursor); p_cursor_grades.Direction = ParameterDirection.Output; // Execute the command cmd.ExecuteNonQuery(); // Construct an OracleDataReader from the REF CURSOR OracleDataReader rdr_p_cursor_detail = ((OracleRefCursor)p_cursor_detail.Value).GetDataReader(); if (rdr_p_cursor_detail.Read()) { //This would return an error if it was outside this if statement. //"Operation is not valid due to the current state of the object." OracleString oracleString1 = rdr_p_cursor_detail.GetOracleString(1); LabelSlabID.Text = oracleString1.ToString(); //This correctly returns column name/header. //LabelSlabID.Text = rdr_p_cursor_detail.GetName(0); } else { LabelSlabID.Text = "No Data"; } rdr_p_cursor_detail.Close(); rdr_p_cursor_detail.Dispose(); p_cursor_detail.Dispose(); p_cursor_comments.Dispose(); p_cursor_grades.Dispose(); } catch (Exception e) </code></pre> <p>The truncated oracle procedure:</p> <pre><code>PROCEDURE getSlab (rb_category IN VARCHAR2 ,rb_category_value IN VARCHAR2 ,rb_type IN VARCHAR2 ,rb_chem_value IN VARCHAR2 ,cb_inside_only IN VARCHAR2 ,cb_appl_pending IN VARCHAR2 ,cb_appl_soft_approved IN VARCHAR2 ,cb_appl_hard_approved IN VARCHAR2 ,cb_appl_mechanically IN VARCHAR2 ,cb_as_cast IN VARCHAR2 ,cb_as_dispoed IN VARCHAR2 ,cb_chem_match IN VARCHAR2 ,cb_near_match IN VARCHAR2 ,txt_width_min IN NUMBER ,txt_width_max IN NUMBER ,txt_quality_min IN NUMBER ,txt_quality_max IN NUMBER ,txt_days_old_min IN NUMBER ,txt_days_old_max IN NUMBER ,txt_days_rev_min IN NUMBER ,txt_days_rev_max IN NUMBER ,txt_reviewer IN VARCHAR2 ,cb_excl_hr IN VARCHAR2 ,cb_excl_cr IN VARCHAR2 ,cb_excl_galv IN VARCHAR2 ,cb_excl_tin IN VARCHAR2 ,cur_OUT OUT t_cursor1 ,cur_OUT1 OUT t_cursor2 ,cur_OUT2 OUT t_cursor3) IS --All the queries and so forth are performed and data sent to temp tables. OPEN v_cursor1 FOR SELECT * FROM TABLE(CAST(g_slab_table AS getSlab_table)); cur_OUT := v_cursor1; OPEN v_cursor2 FOR SELECT * FROM TABLE(CAST(g_comment_table AS getComment_table)); cur_OUT1 := v_cursor2; OPEN v_cursor3 FOR SELECT * FROM TABLE(CAST(g_grades_table AS getGrades_table)); cur_OUT2 := v_cursor2; </code></pre> <p>Any ideas? I'm leaning towards improper reader use, but can't figure out what I'm missing. Thanks.</p>
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