从.NET调用Oracle函数作为存储过程

I have written a simple Oracle function called Testing with no parameters that returns a string. When I try to call it from my .NET app, I get an error:

我编写了一个简单的Oracle函数，名为Testing，没有返回字符串的参数。当我尝试从我的.NET应用程序调用它时，我收到一个错误：

System.Data.OracleClient.OracleException:

System.Data.OracleClient.OracleException：

ORA-06550: line 1, column 7:" "PLS-00221: 'TESTING2' is not a procedure or is undefined".

ORA-06550：第1行第7列：“”PLS-00221：'TESTING2'不是程序或未定义“。

When I change it to do "Select testing() from dual" and change CommandType to Text, it works. What am I missing?

当我将其更改为“从双重选择测试（）”并将CommandType更改为文本时，它可以正常工作。我错过了什么？

Dim oracleConn As OracleConnection = CreateConnection(<connection info here>)

    Dim oracleCmd As New OracleCommand()
    oracleCmd.Connection = oracleConn
    'oracleCmd.CommandText = "SELECT TESTING2() FROM DUAL" 'this works
    oracleCmd.CommandText = "TESTING2"   'this does not work

    oracleCmd.CommandType = CommandType.StoredProcedure

    'oracleCmd.ExecuteReader()  'also tried this
    Dim tmpVar As String = oracleCmd.ExecuteScalar()

create or replace FUNCTION testing2
RETURN VARCHAR2
AS      
begin
  return 'hello';
end;

1 个解决方案

#1

I don't work with Oracle anymore, so I can't test it now, but you tell me if this example works or not

我不再使用Oracle了，所以我现在无法测试它，但你告诉我这个例子是否有效

Dim oracleConn As OracleConnection = CreateConnection(<connection info here>)
Dim oracleCmd As New OracleCommand()
oracleCmd.Connection = oracleConn
oracleCmd.CommandText = "TESTING2"   
oracleCmd.CommandType = CommandType.StoredProcedure
Dim prm = new OracleParameter("returnvalue", OracleType.VarChar)
prm.Size = 1024
prm.Direction = ParameterDirection.ReturnValue
oracleCmd.Parameters.Add(prm)
oracleCmd.ExecuteNonQuery()

Console.WriteLine(prm.Value.ToString)

And by the way, I suppose that CreateConnection returns an OPEN connection right?

顺便说一下，我想CreateConnection会返回一个OPEN连接吗？

#1