C# 那么把数据返回给调用者呢？这很可能是我的问题。我试过做一个返回rcursor就在OPEN…行之后，但这似乎没有改变任何东西。尝试按位置绑定以将其从图片中删除，还可以在oracle主页的odp.net samples目录中看到ref cursor示例代码…还

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那么把数据返回给调用者呢？这很可能是我的问题。我试过做一个

返回rcursor就在
OPEN…
行之后，但这似乎没有改变任何东西。尝试按位置绑定以将其从图片中删除，还可以在oracle主页的odp.net samples目录中看到ref cursor示例代码…还大大简化了sql，因此可以保证返回一些行（去掉嵌套的select）按位置绑定会导致
ORA-00932:不一致的数据类型：预期-获取游标
错误。我不知道这是离解决方案更近了一步，还是更远了一步。编辑：我实际上注释掉了游标语句中的整个WHERE子句（见上文），以保证我应该得到一些东西。没有骰子。没有错误，但返回游标。值仍然为空。尝试
ExecuteReader（）
仍然返回一个没有行、没有骰子的读取器。没有错误，但返回游标。值仍然为空。尝试
ExecuteReader（）
仍然返回一个没有行的读取器。是否可以以类似的方式执行SP？e、 g.@“执行My_PROC（：Param1，：Param2，：Param3）；”并且Param3是My_PROC中的输出参数。是否可以以类似的方式执行SP？e、 g.@“执行我的_进程（：Param1，：Param2，：Param3）；”并且Param3是我的_进程中的输出参数
DECLARE type id_array IS TABLE OF number;
t_Ids id_array;
BEGIN
UPDATE CSM_RECORDS SET MIGRATION_STATE = 1, LAST_UPDATE = CURRENT_DATE
WHERE OBJECT_UID IN 
(SELECT OBJECT_UID 
FROM CSM_RECORDS obj 
WHERE MIGRATION_STATE = 0
AND ROWNUM <= :BatchSize)
AND (:BatchName IS NULL OR obj.BATCH_NAME = :BatchName)
RETURNING OBJECT_UID BULK COLLECT INTO t_Ids;

OPEN rcursor FOR SELECT * FROM CSM_RECORDS;-- WHERE OBJECT_UID IN (t_Ids);
END;

OracleCommand getNextNodesC = new OracleCommand(SQL_AS_SHOWN_ABOVE, conn);
getNextNodesC.BindByName = true;

OracleParameter batchSizeP = new OracleParameter("BatchSize", OracleDbType.Int32);
batchSizeP.Value = batchSize;

getNextNodesC.Parameters.Add(batchSizeP);

OracleParameter batchNameP = new OracleParameter("BatchName", OracleDbType.Varchar2);
batchNameP.Value = batchName;

getNextNodesC.Parameters.Add(batchNameP);


OracleParameter returnCursor = new OracleParameter("rcursor", OracleDbType.RefCursor);
returnCursor.Direction = ParameterDirection.Output;
getNextNodesC.Parameters.Add(returnCursor);

getNextNodesC.ExecuteNonQuery();

return ((Oracle.ManagedDataAccess.Types.OracleRefCursor)returnCursor.Value).GetDataReader();

DECLARE type id_array IS TABLE OF number;
t_Ids id_array;
BEGIN
UPDATE CSM_RECORDS SET MIGRATION_STATE = 1, LAST_UPDATE = CURRENT_DATE
WHERE OBJECT_UID IN 
(SELECT OBJECT_UID 
FROM CSM_RECORDS obj 
WHERE MIGRATION_STATE = 0
AND ROWNUM <= :BatchSize)
RETURNING OBJECT_UID BULK COLLECT INTO t_Ids;

SELECT * FROM CSM_RECORDS;-- WHERE OBJECT_UID IN (t_Ids);
END;

OPEN :rcursor FOR SELECT * FROM CSM_RECORDS;-- WHERE OBJECT_UID IN (t_Ids);

var rcursor refcursor
var fromDate varchar2(50)
var toDate varchar2(50)
exec :fromDate := '1-mar-2014';
exec :toDate := '1-apr-2014';

begin
  open :rcursor for
    SELECT
     trunc(to_date(:fromDate,'dd-mon-yyyy')) + NUMTODSINTERVAL(n,'day') AS Full_Date
    FROM (
    select (level-1) n
    from dual
    connect by level-1 <= trunc(to_date(:toDate,'dd-mon-yyyy')) - trunc(to_date(:fromDate,'dd-mon-yyyy'))
   )
  ;
end;
/
print rcursor

[Test]
public void RefCursorFromBatch()
{
  OracleCommand cmd = new OracleCommand();
  cmd.CommandText = @"
  begin
    open :rcursor for
      SELECT
       trunc(to_date(:fromDate,'dd-mon-yyyy')) + NUMTODSINTERVAL(n,'day') AS Full_Date
      FROM (
      select (level-1) n
      from dual
      connect by level-1 <= trunc(to_date(:toDate,'dd-mon-yyyy')) - trunc(to_date(:fromDate,'dd-mon-yyyy'))
     )
    ;
  end;";
  cmd.BindByName = true;
  cmd.Parameters.Add("fromDate", OracleDbType.Date).Value = DateTime.Today.AddDays(-30);
  cmd.Parameters.Add("toDate", OracleDbType.Date).Value = DateTime.Today;
  cmd.Parameters.Add("rcursor", OracleDbType.RefCursor).Direction = ParameterDirection.Output;

  using (cmd.Connection = new OracleConnection("..."))
  {
    cmd.Connection.Open();
    var reader = cmd.ExecuteReader();

    OracleDataAdapter da = new OracleDataAdapter(cmd);
    DataTable dt = new DataTable();
    da.Fill(dt);

    Assert.Greater(dt.Rows.Count, 0);

  }
}

using System;
using System.Data;
using Oracle.ManagedDataAccess.Client;
using Oracle.ManagedDataAccess.Types;

namespace ConsoleApplication1
{
  class Class1
  {

    [STAThread]
    static void Main(string[] args)
    {
      try
      { 
        string conString = "User Id=scott;Password=tiger;Data Source=orcl;Pooling=false;";

        OracleConnection con = new OracleConnection();
        con.ConnectionString = conString;
        con.Open();

        string cmdtxt = "BEGIN " +
          "OPEN :1 for select ename, deptno from emp where deptno = 10; " +
          "OPEN :2 for select ename, deptno from emp where deptno = 20; " +
          "OPEN :3 for select ename, deptno from emp where deptno = 30; " +
          "END;";

        OracleCommand cmd = con.CreateCommand();
        cmd.CommandText = cmdtxt;

        OracleParameter p1 = cmd.Parameters.Add("refcursor1",
            OracleDbType.RefCursor);
        p1.Direction = ParameterDirection.Output;

        OracleParameter p2 = cmd.Parameters.Add("refcursor2",
            OracleDbType.RefCursor);
        p2.Direction = ParameterDirection.Output;

        OracleParameter p3 = cmd.Parameters.Add("refcursor3",
            OracleDbType.RefCursor);
        p3.Direction = ParameterDirection.Output;


        cmd.ExecuteNonQuery();


        OracleDataReader dr1 =
          ((OracleRefCursor)cmd.Parameters[2].Value).GetDataReader();
        OracleDataReader dr2 =
          ((OracleRefCursor)cmd.Parameters[1].Value).GetDataReader();


        while (dr1.Read() && dr2.Read())
        {
          Console.WriteLine("Employee Name: " + dr1.GetString(0) + ", " +
              "Employee Dept:" + dr1.GetDecimal(1));
          Console.WriteLine("Employee Name: " + dr2.GetString(0) + ", " +
              "Employee Dept:" + dr2.GetDecimal(1));
          Console.WriteLine();
        }

        Console.WriteLine("Press 'Enter' to continue");
        Console.ReadLine();


      }
      catch (Exception ex)
      {
        Console.WriteLine(ex.Message);
        Console.WriteLine(ex.InnerException);
        Console.WriteLine(ex.Data);
      }
    }
  }
}

create type id_array as table of number;

DECLARE t_Ids id_array;
BEGIN
UPDATE CSM_RECORDS SET MIGRATION_STATE = 1, LAST_UPDATE = CURRENT_DATE
    WHERE OBJECT_UID IN 
    (SELECT OBJECT_UID 
    FROM CSM_RECORDS obj 
    WHERE MIGRATION_STATE = 0
    AND ROWNUM <= :BatchSize
    AND (:BatchName IS NULL OR obj.BATCH_NAME = :BatchName)
RETURNING OBJECT_UID BULK COLLECT INTO t_Ids;

OPEN :rcursor FOR SELECT * FROM CSM_RECORDS WHERE OBJECT_UID IN (SELECT * FROM TABLE(cast(t_Ids as id_array)));
END;

OracleCommand getNextNodesC = new OracleCommand(QUERY_DEFINED_ABOVE.Replace("\r\n", "\n"), conn);

getNextNodesC.BindByName = true;

OracleParameter batchSizeP = new OracleParameter("BatchSize", OracleDbType.Int32);
batchSizeP.Value = batchSize;
getNextNodesC.Parameters.Add(batchSizeP);

OracleParameter batchNameP = new OracleParameter("BatchName", OracleDbType.Varchar2);
batchNameP.Value = batchName;
getNextNodesC.Parameters.Add(batchNameP);

OracleParameter returnCursor = new OracleParameter("rcursor", OracleDbType.RefCursor);
returnCursor.Direction = ParameterDirection.ReturnValue;
getNextNodesC.Parameters.Add(returnCursor);

return getNextNodesC.ExecuteReader();