Oracle ManagedDataAccess 不从存储过程参数中检索字符串

Question

对不起，如果我的英语没有我希望的那么好：D。 我使用 VS2013 并通过 Nuget 包下载了 ODP.NET。 我在 Oracle 数据库的 sp 中调用一个方法。我已经能够建立连接，但是当我尝试从输出参数中获取字符串值时，这个值为空。 int 值检索 ok 但不是字符串。 我用相同的值 ej 调用这个方法。员工编号 = 431206 和公司编号 = 0

这是我的网络配置文件 connstring

<connectionStrings>
<add name="OracleMOC"
     connectionString="Data Source=(DESCRIPTION =(ADDRESS_LIST = (ADDRESS = (COMMUNITY = uri.world) (PROTOCOL = TCP) (Host = 14.85.65.12) (Port = 1521)))(CONNECT_DATA =(SID = SIOX)));User Id=***;Password=****;"
     providerName="Oracle.ManagedDataAccess.Client" />

还有我的代码

 public Employee GetEmployeeByNumber(string employeeNumber, int companyNumber)
    {
        Employee employee = new Employee();
            OracleConnection con = new OracleConnection(ConfigurationManager.ConnectionStrings["OracleMOC"].ToString());
            con.Open();
            OracleCommand cmd = con.CreateCommand();
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "SPR.GetEmployeeDetail";
            cmd.Parameters.Add("I_FEC_APROY", OracleDbType.Date, DateTime.Now, ParameterDirection.Input);
            cmd.Parameters.Add("I_FICHA", OracleDbType.Int32, Convert.ToInt32(employeeNumber.Trim()), ParameterDirection.Input);
            cmd.Parameters.Add("I_EMPCLAVE", OracleDbType.Int32, companyNumber, ParameterDirection.Input);
            cmd.Parameters.Add("O_RC", OracleDbType.Varchar2, 50000, ParameterDirection.InputOutput);
            cmd.Parameters.Add("O_PLAZA", OracleDbType.Varchar2, ParameterDirection.Output);
            cmd.Parameters.Add("O_NIVEL", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_NIVEL_P", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_CENTRO", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_DEPTO", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_DDEPTO", OracleDbType.Varchar2, 50000, ParameterDirection.InputOutput);
            cmd.Parameters.Add("O_AEMP", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_DEMP", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_FEC_RPROY", OracleDbType.Varchar2, 50000, ParameterDirection.InputOutput);
            cmd.Parameters.Add("O_VALIDO", OracleDbType.Varchar2, ParameterDirection.Output);
            cmd.Parameters.Add("O_FICHA", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_NOMBRE", OracleDbType.Varchar2, ParameterDirection.Output);
            cmd.Parameters.Add("O_APPAT", OracleDbType.Varchar2, ParameterDirection.Output);
            cmd.Parameters.Add("O_APMAT", OracleDbType.Varchar2, ParameterDirection.Output);
            cmd.Parameters.Add("O_ORGANISMO", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_NUMFAM", OracleDbType.Int32, ParameterDirection.Output);
            cmd.Parameters.Add("O_DESC_ORG", OracleDbType.Varchar2, ParameterDirection.Output);
            cmd.ExecuteNonQuery();

            employee.EmployeeNumber = employeeNumber;
            employee.CompanyNumber = companyNumber;
            employee.Regime = cmd.Parameters["O_RC"].Value.ToString();
            employee.Plaza = cmd.Parameters["O_PLAZA"].Value.ToString();
            employee.Level = cmd.Parameters["O_NIVEL"].Value.ToString();
            employee.Level_P = cmd.Parameters["O_NIVEL_P"].Value.ToString();
            employee.CenterNumber = cmd.Parameters["O_CENTRO"].Value.ToString() == "null" ? 0 : Convert.ToInt32(cmd.Parameters["O_CENTRO"].Value.ToString());
            employee.DepartmentNumber = cmd.Parameters["O_DEPTO"].Value.ToString() == "null" ? 0 : Convert.ToInt32(cmd.Parameters["O_DEPTO"].Value.ToString());
            employee.DepartmentDescription = cmd.Parameters["O_DDEPTO"].Value.ToString();
            employee.EmployeeYear = cmd.Parameters["O_AEMP"].Value.ToString() == "null" ? 0 : Convert.ToInt32(cmd.Parameters["O_AEMP"].Value.ToString());
            employee.EmployeeDay = cmd.Parameters["O_DEMP"].Value.ToString() == "null" ? 0 : Convert.ToInt32(cmd.Parameters["O_DEMP"].Value.ToString());
            employee.FirstName = cmd.Parameters["O_NOMBRE"].Value.ToString();
            employee.LastName = cmd.Parameters["O_APPAT"].Value.ToString();
            employee.LastName2 = cmd.Parameters["O_APMAT"].Value.ToString();

            employee.Organism = cmd.Parameters["O_ORGANISMO"].Value.ToString();

            if (cmd.Parameters["O_VALIDO"].Value.ToString() == "null")
                employee.IsValid = false;
            else
            {
                if (cmd.Parameters["O_VALIDO"].Value.ToString() == "true")
                {
                    employee.IsValid = false;
                }
                else
                {
                    employee.IsValid = true;
                }
            }

            employee.DateFinish = cmd.Parameters["O_FEC_RPROY"].Value.ToString();
            employee.OrganismDescription = cmd.Parameters["O_DESC_ORG"].Value.ToString();
            con.Close();

        return employee;

    }

我测试了相同的 sp，但使用的是具有相同提供程序的企业库。

public Employee GetEmployeeByNumber(string employeeNumber, int companyNumber)
    {            
        Employee employee = null;
        try
        {
            if (!String.IsNullOrEmpty(employeeNumber))
            {                    
                EmployeeDataSet ds = new EmployeeDataSet();
                DatabaseProviderFactory dbProviderFactory = new DatabaseProviderFactory();
                Database db = dbProviderFactory.Create("OracleMOC");

                DbCommand cmd = db.GetStoredProcCommand("SPR.GetEmployeeDetail");
                db.AddInParameter(cmd, "I_FEC_APROY", DbType.DateTime, DateTime.Now);
                db.AddInParameter(cmd, "I_FICHA", DbType.Int32, Convert.ToInt32(employeeNumber.Trim()));
                db.AddInParameter(cmd, "I_EMPCLAVE", DbType.Int32, companyNumber);
                db.AddOutParameter(cmd, "O_RC", DbType.String, 200);
                db.AddOutParameter(cmd, "O_PLAZA", DbType.String, 200);
                db.AddOutParameter(cmd, "O_NIVEL", DbType.Int32, 100);
                db.AddOutParameter(cmd, "O_NIVEL_P", DbType.Int32, 100);
                db.AddOutParameter(cmd, "O_CENTRO", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_DEPTO", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_DDEPTO", DbType.String, 200);
                db.AddOutParameter(cmd, "O_AEMP", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_DEMP", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_FEC_RPROY", DbType.DateTime, 200);
                db.AddOutParameter(cmd, "O_VALIDO", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_FICHA", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_NOMBRE", DbType.String, 200);
                db.AddOutParameter(cmd, "O_APPAT", DbType.String, 200);
                db.AddOutParameter(cmd, "O_APMAT", DbType.String, 200);
                db.AddOutParameter(cmd, "O_ORGANISMO", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_NUMFAM", DbType.Int32, 200);
                db.AddOutParameter(cmd, "O_DESC_ORG", DbType.String, 200);

                db.ExecuteNonQuery(cmd);

                if (String.IsNullOrEmpty(db.GetParameterValue(cmd, "O_NOMBRE").ToString()) && String.IsNullOrEmpty(db.GetParameterValue(cmd, "O_APPAT").ToString()))
                {
                    return employee;
                }
                else
                {
                    employee = new Employee();
                }
                employee.EmployeeNumber = employeeNumber;
                employee.CompanyNumber = companyNumber;
                employee.Plaza = db.GetParameterValue(cmd, "O_PLAZA").ToString();
                employee.Level = db.GetParameterValue(cmd, "O_NIVEL").ToString();
                employee.Level_P = db.GetParameterValue(cmd, "O_NIVEL_P").ToString();
                employee.CenterNumber = db.GetParameterValue(cmd, "O_CENTRO") == DBNull.Value ? 0 : Convert.ToInt32(db.GetParameterValue(cmd, "O_CENTRO"));
                employee.DepartmentNumber = db.GetParameterValue(cmd, "O_DEPTO") == DBNull.Value ? 0 : Convert.ToInt32(db.GetParameterValue(cmd, "O_DEPTO"));
                employee.DepartmentDescription = db.GetParameterValue(cmd, "O_DDEPTO").ToString();
                employee.EmployeeYear = db.GetParameterValue(cmd, "O_AEMP") == DBNull.Value ? 0 : Convert.ToInt32(db.GetParameterValue(cmd, "O_AEMP"));
                employee.EmployeeDay = db.GetParameterValue(cmd, "O_DEMP") == DBNull.Value ? 0 : Convert.ToInt32(db.GetParameterValue(cmd, "O_DEMP"));
                employee.FirstName = db.GetParameterValue(cmd, "O_NOMBRE").ToString();
                employee.LastName = db.GetParameterValue(cmd, "O_APPAT").ToString();
                employee.LastName2 = db.GetParameterValue(cmd, "O_APMAT").ToString();
                employee.Regime = db.GetParameterValue(cmd, "O_RC").ToString();
                employee.Organism = db.GetParameterValue(cmd, "O_ORGANISMO").ToString();
                employee.IsValid = db.GetParameterValue(cmd, "O_VALIDO") == DBNull.Value ? false : !Convert.ToBoolean(db.GetParameterValue(cmd, "O_VALIDO"));
                employee.DateFinish = db.GetParameterValue(cmd, "O_FEC_RPROY").ToString();
                employee.OrganismDescription = db.GetParameterValue(cmd, "O_DESC_ORG").ToString();
            }
            return employee;
        }
        catch (Exception ex)
        {
            return null;
        }           
    }

不幸的是，我没有 10 的声望来发布图片。

最大的问题是，为什么 ODP.NET 可以与企业库一起正常工作，但不能与据说更好的本机代码一起工作。我做错了吗？

Answer 1

我对 Mananged ODP.NET 没有太多经验，但在较旧的 ODP:NET 中，您必须指定最大值。返回值的长度，即应该是这样的：

myOracleCmd.Parameters.Add("O_APMAT", OracleDbType.Varchar2, ParameterDirection.Output);
myOracleCmd.Parameters["O_APMAT"].Size = 1000;

或者你可以写成一行：

myOracleCmd.Parameters.Add("O_APMAT", OracleDbType.Varchar2, 1000, null, ParameterDirection.Output);

那么也许你还必须指定参数的DbType，即

cmyOracleCmdmd.Parameters["O_APMAT"].DbType = DbType.String;

在这里您可以看到 DbType 与 OracleDbType 的列表：C#: Oracle Data Type Equivalence with OracleDbType

然后一个一般说明：你的SP包含很多输出参数，也许只返回一个RefCursor并从这个光标中读出属性而不是一个一个地定义每个输出参数会更短。