从 C# 和 ODP.NET 调用包中的函数的代码

Code for calling a function in a package from C# and ODP.NET

提问by user2776709

I've tried to write C# code with ODP.NET to call a function in a package. I'm getting the two errors below:

我试图用 ODP.NET 编写 C# 代码来调用包中的函数。我收到以下两个错误：

ORA-06550: line 1, column 7:
PLS-00306: wrong number or types of arguments in call to INSERT_FUNC'
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

ORA-06550: line 1, column 7:
PLS-00221: 'INSERT_FUNC' is not a procedure or is undefined
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored

My OracleCommandis set up as:

我OracleCommand的设置为：

cmd.CommandText = "PKG_NAME.INSERT_FUNC";
cmd.CommandType = CommandType.StoredProcedure;

1. How should I pass parameters to the function below?
2. Do I need to add a ReturnValueparameter? I've seen many forums discussing the need to add a ReturnValueparameter as the first OracleParameteron the OracleCommandobject.

1. 我应该如何将参数传递给下面的函数？
2. 我需要添加ReturnValue参数吗？我见过很多论坛讨论需要添加ReturnValue参数作为第一个OracleParameter在上OracleCommand对象。

I would appreciate any suggestions.

我将不胜感激任何建议。

CREATE OR REPLACE
PACKAGE BODY pkg_name IS
  FUNCTION insert_func (
      i_description IN  tableName.description%TYPE,
      i_theme       IN  tableName.theme%TYPE,
      o_id          OUT tableName.id%TYPE,
      o_error_msg   OUT VARCHAR2 )
    RETURN NUMBER
  IS
    l_program VARCHAR2(100) := 'PKG_NAME.INSERT_FUNC';
  BEGIN
    INSERT INTO tablea ( event_id, id, description, theme, lock_version )
      VALUES ( rms12.tablea_seq.NEXTVAL, rms12.tablea_id_seq.NEXTVAL, i_description, i_theme, NULL );
    INSERT INTO tableb ( id, description, theme )
      VALUES ( rms12.id_seq.CURRVAL, i_description, i_theme );
    SELECT rms12.id_seq.CURRVAL
      INTO o_id
      FROM dual;
    RETURN 1;
  EXCEPTION
    WHEN OTHERS THEN
      o_error_msg := sql_lib.create_msg(
          'PACKAGE_ERROR', SQLERRM, l_program, TO_CHAR( SQLCODE ) );
      RETURN 0;
  END insert_func;
END pkg_name;

采纳答案by user2776709

This is my first question on this forum and I am happy to post to my own answer.

这是我在这个论坛上的第一个问题，我很高兴发布我自己的答案。

We can call an oracle package function using ODP.NET by setting CommandType.StoredProcedure.

我们可以通过设置CommandType.StoredProcedure.

ORA-06550: line 1, column 7:
PLS-00221: 'INSERT_FUNC' is not a procedure or is undefined
ORA-06550: line 1, column 7: PL/SQL: Statement ignored

If you get this error, just add this line as the first parameter on the command object:

如果出现此错误，只需将此行添加为命令对象的第一个参数：

cmd.Parameters.Add("Return_Value", OracleDbType.Int16,
    ParameterDirection.ReturnValue);

Here is the working code:

这是工作代码：

using (var conn = new OracleConnection(oradb))
using (var cmd = conn.CreateCommand())
{
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "PKG_NAME.INSERT_FUNC";

    cmd.BindByName = true;

    cmd.Parameters.Add("Return_Value", OracleDbType.Int16,
        ParameterDirection.ReturnValue);
    cmd.Parameters.Add("i_description", OracleDbType.Varchar2, 1000,
        promotionEventSetupDetails.PromotionDescription,
        ParameterDirection.Input);
    cmd.Parameters.Add("i_theme", OracleDbType.Varchar2, 80,
        promotionEventSetupDetails.PromotionTheme,
        ParameterDirection.Input);
    cmd.Parameters.Add("o_id", OracleDbType.Varchar2,
        ParameterDirection.Output);
    cmd.Parameters.Add("o_error_msg", OracleDbType.Varchar2,
        ParameterDirection.Output);

    conn.Open();
    using (var dr = cmd.ExecuteReader())
    {
        // do some work here
    }
}

回答by Ken

This must be new with a more recent version of Oracle. I was previously able to do this with the return value parameter listed after all of the input parameters in my C# code, but after running this on 12c I had this exact issue, which now works with this suggestion of putting the return val param first.

这必须是更新版本的 Oracle 的新功能。我以前能够使用在我的 C# 代码中的所有输入参数之后列出的返回值参数来执行此操作，但是在 12c 上运行此命令后，我遇到了这个确切的问题，现在可以使用将 return val 参数放在首位的建议。

回答by ppenchev

I have created a generic method that helps you get your function result

我创建了一个通用方法来帮助您获得函数结果

var result = await 
 dbManager.ExecuteFunctionResultAsync<Oracle.ManagedDataAccess.Types.OracleDecimal>(
                     functionName, parameters.List);


public async Task<T> ExecuteFunctionResultAsync<T>(string spName, IEnumerable<OracleParameter> paramaters)
        {
            using (OracleConnection connection = new OracleConnection(this.connectionString))
            {
                connection.Open();
                using (OracleCommand comm = new OracleCommand(spName, connection))
                {
                    comm.CommandType = CommandType.StoredProcedure;
                    comm.BindByName = true;
                    string returnParam = "return_value";
                    comm.Parameters.Add(new OracleParameter() {
                        ParameterName = returnParam,
                        Direction = ParameterDirection.ReturnValue,
                        OracleDbType = OracleDbType.Int16,
                    });

                    this.SetCommandParameters(comm, paramaters);
                    await comm.ExecuteNonQueryAsync();
                    var result = (T)comm.Parameters[returnParam].Value;

                    return result;
                }
            }
        }

private void SetCommandParameters(OracleCommand command, IEnumerable<OracleParameter> paramaters)
        {
            if (paramaters != null)
            {
                foreach (OracleParameter p in paramaters)
                {
                    command.Parameters.Add(p);
                }
            }
        }