尝试从 dotnet 调用 oracle 函数在返回值时出错

Question

我正在尝试从 asp.net mvc 端调用 oracle 函数并 returning 一个值但出现错误“{"ORA-06502: PL/SQL: numeric or value error: character string buffer too small\nORA-06512: at line 1"}。

在 Oracle 端，我编写了一个 return 连接值的函数，然后在 dotnet 端，我正在检索该值。

Oracle 函数

CREATE OR REPLACE FUNCTION func_multi_val(PROD_DATE in varchar2)
 RETURN varchar2  
 is 
  var_value varchar2(200);
  x varchar2     (200);
  cursor age_val is 
 SELECT AGE_CD,
 decode(AGE_CD,'04','CL LINE(R','05','CR ','A',NULL,STAGE_DESC) STAGE_DESC ,
 STAGE_SEQ      
 FROM DBPROD.PROD_AGE_MST
 WHERE STAGE_SEQ < 15
 AND STAGE_CD NOT IN ('ZA','05')
 ORDER BY 3;  
 BEGIN
    FOR i IN age_val LOOP
      SELECT To_Char(Round(NVL(SUM(NVL(WF_PROD_WT, 0)), 0), 0)) 
      INTO X
      FROM DBPROD.Prod_age_wp_gs_cur
     WHERE WF_DATE BETWEEN trunc(to_date(PROD_DATE,'dd-MM-YYYY')) AND  trunc(to_date(OD_DATE,'dd-MM-YYYY')+1)
       AND WF_STAGE_CD=i.AGE_CD;
    var_value := var_value || X||'~';
   END LOOP;
return var_value;
END;

Asp.net MVC

try
   {
    conn.Open();
    OracleCommand command = new OracleCommand();
    command.Connection = conn;
    command.CommandText = "func_multi_val";
    command.CommandType = CommandType.StoredProcedure;
    command.Parameters.Add("PROD_DATE", OracleDbType.Varchar2).Value = DateTime.Now.ToString("dd-MM-yyyy");
    command.Parameters.Add("var_value", OracleDbType.Varchar2).Direction = ParameterDirection.ReturnValue;
    command.ExecuteScalar();
    object o = command.ExecuteScalar();

     }  
     catch(Exception ex)
     {
     }

预期：连接值应该是 return 从 dotnet 的 Oracle 端检索。 Actual:Getting 绑定“{"ORA-06502: PL/SQL: numeric or value error: character string buffer too small\nORA-06512: at line 1"}”时 dotnet 端出错。任何想法都将不胜感激

Answer 1

VAR_VALUE 包含串联结果。如果它（结果）超过 200 个字符，它就不能放入 VARCHAR2(200) 变量中，因为 VAR_VALUE 是这样声明的。

因此，放大它。

Answer 2

另一种回答方式我只是从 oracle 查询中删除参数并使用 sysdate 函数而不是使用 PROD_DATE 变量

CREATE OR REPLACE FUNCTION func_multi_val
 RETURN varchar2  
 is 
  var_value varchar2(200);
  x varchar2     (200);
  cursor age_val is 
 SELECT AGE_CD,
 decode(AGE_CD,'04','CL LINE(R','05','CR ','A',NULL,STAGE_DESC) STAGE_DESC ,
 STAGE_SEQ      
 FROM DBPROD.PROD_AGE_MST
 WHERE STAGE_SEQ < 15
 AND STAGE_CD NOT IN ('ZA','05')
 ORDER BY 3;  
 BEGIN
    FOR i IN age_val LOOP
      SELECT To_Char(Round(NVL(SUM(NVL(WF_PROD_WT, 0)), 0), 0)) 
      INTO X
      FROM DBPROD.Prod_age_wp_gs_cur
     WHERE PSWF_DATE BETWEEN sysdate AND  sysdate+1
       AND WF_STAGE_CD=i.AGE_CD;
    var_value := var_value || X||'~';
   END LOOP;
return var_value;
END;

在 dotnet 方面我做了以下修改

try
   {
    conn.Open();
    OracleCommand command = new OracleCommand();
    command.Connection = conn;
    command.CommandText = "func_multi_val";
    command.CommandType = CommandType.StoredProcedure;    
   command.Parameters.Add("var_value", OracleDbType.Varchar2,200).Direction = ParameterDirection.ReturnValue;
    command.ExecuteScalar();
    object o = command.Parameters["var_value"].Value;

     }  
     catch(Exception ex)
     {
     }

尝试从 dotnet 调用 oracle 函数在返回值时出错

Trying to call oracle function from dotnet getting error while returning value

c#

oracle

asp.net-mvc

ado.net