ASP.NET/C# 中的“必须声明 pls-00201 标识符”

Question

我想在 C#/.NET 中使用以下存储过程：

CREATE OR REPLACE
procedure contact_return(
    v_urn IN VARCHAR2,
    p_cursor OUT SYS_REFCURSOR )
AS
  sql_statement VARCHAR2(4000) := '        

  SELECT URN,
    FIRSTNAME,
    LASTNAME,
    TITLE,
    MOBILE,
    WORK,
    EMAIL
  FROM CONTACT
  WHERE urn = NVL(:1,v_contact_urn)';
BEGIN
  OPEN p_cursor FOR sql_statement USING v_urn;

使用此代码，我收到错误：PLS-00201: identifier 'CONTACT_RETURN' must be declared

        OracleCommand cmd = new OracleCommand();
        cmd.Connection = conn;
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.CommandText = "contact_return";
        cmd.Parameters.Add("v_urn", OracleDbType.Int64).Value = null;
        cmd.Parameters.Add("p_cursor", OracleDbType.RefCursor).Direction = ParameterDirection.Output;

据我所知，我已正确声明了存储过程 ('contact_return')，因此无法弄清楚为什么会出现此错误。

任何帮助将不胜感激，谢谢:)

Answer 1

要调用包含SYS_REFCURSOR 类型的OUT 参数的Oracle 存储过程，您需要使用ODP.NET。
模板解决方案是这样的：

using Oracle.DataAccess;
using Oracle.DataAccess.Client;

public DataTable Call_contact_return(string v_urn_value)
            {
                using (OracleConnection cn = new OracleConnection(DatabaseHelper.GetConnectionString()))
                {
                    OracleDataAdapter da = new OracleDataAdapter();
                    OracleCommand cmd = new OracleCommand();
                    cmd.Connection = cn;
                    cmd.InitialLONGFetchSize = 1000;
                    cmd.CommandText = DatabaseHelper.GetDBOwner() + "contact_return";
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.Add("v_urn", OracleDbType.Char).Value = v_urn_value;                    
                    cmd.Parameters.Add("p_cursor", OracleDbType.RefCursor).Direction = ParameterDirection.Output;

                    da.SelectCommand = cmd;
                    DataTable dt = new DataTable();
                    da.Fill(dt);
                    return dt;
                }
            }

Answer 2

不应该这样

CREATE OR REPLACE
procedure contact_return(
    v_urn IN VARCHAR2,
    p_cursor OUT SYS_REFCURSOR )
AS
  sql_statement VARCHAR2(4000) := '        

  SELECT URN,
    FIRSTNAME,
    LASTNAME,
    TITLE,
    MOBILE,
    WORK,
    EMAIL
  FROM CONTACT
  WHERE urn = NVL(:1,v_contact_urn)';
BEGIN
  OPEN p_cursor FOR sql_statement USING v_urn;

是

CREATE OR REPLACE
procedure contact_return(
    v_urn IN VARCHAR2,
    p_cursor OUT SYS_REFCURSOR )
AS
BEGIN
  DECLARE sql_statement VARCHAR2(4000) := '';        

  SELECT URN,
    FIRSTNAME,
    LASTNAME,
    TITLE,
    MOBILE,
    WORK,
    EMAIL
  FROM CONTACT
  WHERE urn = NVL(:1,v_contact_urn)';

  OPEN p_cursor FOR sql_statement USING v_urn;

END;