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2012-03-07T06:09:38.597
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As far as I understood you question you would like to reduce the round trips to your database. This can be done by a stored procedure in the following way: <a href="http://msdn.microsoft.com/en-us/library/ms971506.aspx#msdnorsps_topic6" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms971506.aspx#msdnorsps_topic6</a> Package header: <pre><code>CREATE OR REPLACE PACKAGE SELECT_JOB_HISTORY AS TYPE T_CURSOR IS REF CURSOR; PROCEDURE GetJobHistoryByEmployeeId ( p_employee_id IN NUMBER, cur_JobHistory OUT T_CURSOR ); END SELECT_JOB_HISTORY; </code></pre> Package: <pre><code>CREATE OR REPLACE PACKAGE BODY SELECT_JOB_HISTORY AS PROCEDURE GetJobHistoryByEmployeeId ( p_employee_id IN NUMBER, cur_JobHistory OUT T_CURSOR ) IS BEGIN OPEN cur_JobHistory FOR SELECT * FROM JOB_HISTORY WHERE employee_id = p_employee_id; END GetJobHistoryByEmployeeId; END SELECT_JOB_HISTORY; </code></pre> Client: <pre><code>// create connection OracleConnection conn = new OracleConnection("Data Source=oracledb; User Id=UserID;Password=Password;"); // create the command for the stored procedure OracleCommand cmd = new OracleCommand(); cmd.Connection = conn; cmd.CommandText = "SELECT_JOB_HISTORY.GetJobHistoryByEmployeeId"; cmd.CommandType = CommandType.StoredProcedure; // add the parameters for the stored procedure including the REF CURSOR // to retrieve the result set cmd.Parameters.Add("p_employee_id", OracleType.Number).Value = 101; cmd.Parameters.Add("cur_JobHistory", OracleType.Cursor).Direction = ParameterDirection.Output; // open the connection and create the DataReader conn.Open(); OracleDataReader dr = cmd.ExecuteReader(); // output the results and close the connection. while(dr.Read()) { for(int i = 0; i < dr.FieldCount; i++) Console.Write(dr[i].ToString() + ";"); Console.WriteLine(); } conn.Close(); </code></pre> If you have to join these tables you can also use a normal join and split the result on the client (imho this is the way how a lot of ORMs do it).
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1. POOracle query/ stored procedure to return multiple resultsets
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1. COThanks Eggi, your solution really helped.
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