将oracle的sys_refcursor返回到C# [英] Return sys_refcursor of the oracle to c#

问题描述

C#:

 public DataSet ListaClientes()
    {
        DataSet ds = new DataSet();
        try
        {
            System.Data.OracleClient.OracleConnection conexion = Conexion.GetConnection();
            if (conexion.State == System.Data.ConnectionState.Open)
            {
                System.Data.OracleClient.OracleCommand cmd = new System.Data.OracleClient.OracleCommand();
                cmd.Connection = conexion;
                cmd.CommandText = "ListadoClientes";
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.Add("resul", OracleDbType.RefCursor).Direction = ParameterDirection.Output;
                cmd.ExecuteNonQuery();
                conexion.Close();
                System.Data.OracleClient.OracleDataAdapter da = new System.Data.OracleClient.OracleDataAdapter(cmd);                    
                da.Fill(ds);                    
            }
            return ds;
        }
        catch(Exception e)
        {
            throw e;
        }
    }

Oracle存储过程:

CREATE OR REPLACE PROCEDURE ListadoClientes(resul OUT sys_refcursor)
IS 
BEGIN 
  OPEN resul for select ID ,NOMBRES ,APELLIDOS ,CEDULA ,DIRECCION ,TELEFONO  
  from cliente; 
END ListadoClientes;

在C#CATCH块中可见错误:

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

推荐答案

是否存在不使用函数而不是过程的原因?

Is there a reason why you do not use a function instead of procedure?

CREATE OR REPLACE FUNCTION ListadoClientes() RETURN sys_refcursor
IS 
resul Sys_refcursor;
BEGIN 
  OPEN resul for select ID ,NOMBRES ,APELLIDOS ,CEDULA ,DIRECCION ,TELEFONO  
  from cliente; 
  RETURN resul;
END ListadoClientes;

然后在C#中，您必须将其更改为此:

Then in C# you must change it to this:

cmd.Parameters.Add("resul", OracleDbType.RefCursor, ParameterDirection.ReturnValue);

当您运行da.Fill(ds);时，该功能将被执行，即使用cmd.ExecuteNonQuery();执行该功能两次.

When you run da.Fill(ds); then the function is executed, i.e. using cmd.ExecuteNonQuery(); executes the function twice.

无论如何，对于一种程序而言，正确的方法应该是这种方式:

Anyway, for a procedure the right way should be this one:

cmd.CommandText = "ListadoClientes(:resul)";

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