pl -00306:呼叫中错误的号码或参数类型

Question

我从。net应用程序调用Oracle函数，我总是得到以下异常:pl -00306:调用'TF_GETNODES'时参数数量或类型错误

下面是Oracle函数的定义:

FUNCTION "IMPACTNET"."TF_GETNODES"
(
    DIMENSIONKEY  IN NVARCHAR2,
    PARENTNODE    IN NVARCHAR2,
    PARASTRING    IN NVARCHAR2
) RETURN IMPACTNET.TREE_NODE_TABLE IS
    treeNodes IMPACTNET.TREE_NODE_TABLE;
BEGIN
    treeNodes:=IMPACTNET.TREE_NODE_TABLE();
    for i in 1..2
    loop
    treeNodes.extend;
    treeNodes(i) := IMPACTNET.TREE_NODE(DIMENSIONKEY || i, PARENTNODE || i, 0, 0, PARASTRING || i, 0);
    end loop;
    RETURN treeNodes;
END;

下面是我的。net代码:

var treeNodes = new TreeNodesTable();
using (var connection = CreateConnection())
using (var command = new OracleCommand { Connection = connection, CommandType = CommandType.StoredProcedure, CommandText = "IMPACTNET.TF_GETNODES" })
{
    command.Parameters.Add("DIMENSIONKEY", OracleDbType.NVarchar2, ParameterDirection.Input).Value = "dimension key";
    command.Parameters.Add("PARENTNODE",   OracleDbType.NVarchar2, ParameterDirection.Input).Value = "parent node";
    command.Parameters.Add("PARASTRING",   OracleDbType.NVarchar2, ParameterDirection.Input).Value = "para string";
    var p1 = new OracleParameter
    {
        ParameterName = "treeNodes",
        OracleDbType = OracleDbType.Object,
        UdtTypeName = "IMPACTNET.TREE_NODE_TABLE",
        Direction = ParameterDirection.ReturnValue,
        Value = treeNodes
    };
    command.Parameters.Add(p1);
    connection.Open();
    command.ExecuteNonQuery();
    treeNodes = (TreeNodesTable)p1.Value;
}

Answer 1

和Allan一样，我不是ODP专家。然而，我知道Oracle将函数的返回值存储为PARAMETER 0在数据字典中。输入参数为1、2等

所以，如果你在输入参数之前声明并赋值返回值，它可能会起作用

Answer 2

我不是。net方面的专家，但在我看来，您将UDT设置为参数，而不是返回值。尝试删除您的函数并用以下过程替换它:

PROCEDURE "IMPACTNET"."TF_GETNODES"
(
    DIMENSIONKEY  IN  NVARCHAR2,
    PARENTNODE    IN  NVARCHAR2,
    PARASTRING    IN  NVARCHAR2,
    treeNodes     OUT IMPACTNET.TREE_NODE_TABLE
) IS
BEGIN
    treeNodes:=IMPACTNET.TREE_NODE_TABLE();
    for i in 1..2 loop
       treeNodes.extend;
       treeNodes(i) := IMPACTNET.TREE_NODE(DIMENSIONKEY || i, 
                                           PARENTNODE || i, 
                                           0, 
                                           0, 
                                           PARASTRING || i, 
                                           0);
    end loop;
END;
/

如果可以，您可以保持原样，或者研究如何在. net调用中获得返回值。