（带有oracle数据库的C＃应用​​程序）返回存储过程中的参数

Question

我是Oracle新手。当我尝试在以下过程中获取out参数的值时，我收到异常：

该程序的工作是提供有关药物的一些信息，并给出其ID，并将结果存储在out参数中

create or replace 
PROCEDURE RETREIVE_DRUG(
    drugId in "Drug"."DRUG_ID"%type,
    drugName OUT "Drug"."NAME"%type,
    prodDate OUT "Drug"."PRODUCTION_DATE"%type,
    expireDate OUT "Drug"."EXPIRATION_DATE"%type,
    price OUT "Drug"."PRICE"%type,
    description OUT "Drug"."DESCRIPTION"%type,
    quantity OUT "Drug"."QUANTITY"%type,
    buying OUT "Drug"."COST"%type,
    company OUT "Drug"."COMPANY"%type
)
AS
BEGIN
    SELECT "NAME", "PRODUCTION_DATE", "EXPIRATION_DATE", "PRICE", "DESCRIPTION", "QUANTITY", "COST", "COMPANY"
    INTO drugName, prodDate, expireDate, price, description, quantity, buying, company
    FROM "Drug"
    WHERE "Drug"."DRUG_ID" = drugId;
END RETREIVE_DRUG;

调用该过程的c＃代码如下

public String[] Get_Drug(int id)
        {
            OpenConnection();

            OracleCommand oraCmd = new OracleCommand();
            oraCmd.Connection = con;
            oraCmd.CommandType = CommandType.StoredProcedure;
            oraCmd.CommandText = "RETREIVE_DRUG";

            OracleParameter[] param = new OracleParameter[9];

            param[0] = new OracleParameter("DRUG_ID", OracleDbType.Decimal);
            param[0].Value = id;
            param[1] = new OracleParameter("NAME", OracleDbType.Varchar2);
            param[1].Direction = ParameterDirection.Output;
            param[2] = new OracleParameter("PRODUCTION_DATE", OracleDbType.Date);
            param[2].Direction = ParameterDirection.Output;
            param[3] = new OracleParameter("EXPIRATION_DATE", OracleDbType.Date);
            param[3].Direction = ParameterDirection.Output;
            param[4] = new OracleParameter("PRICE", OracleDbType.Decimal);
            param[4].Direction = ParameterDirection.Output;
            param[5] = new OracleParameter("DESCRIPTION", OracleDbType.Varchar2);
            param[5].Direction = ParameterDirection.Output;
            param[6] = new OracleParameter("QUANTITY", OracleDbType.Decimal);
            param[6].Direction = ParameterDirection.Output;
            param[7] = new OracleParameter("COST", OracleDbType.Decimal);
            param[7].Direction = ParameterDirection.Output;
            param[8] = new OracleParameter("COMPANY", OracleDbType.Varchar2);
            param[8].Direction = ParameterDirection.Output;

            oraCmd.Parameters.AddRange(param);

            oraCmd.ExecuteNonQuery();
            CloseConnection();  
            String[] ret = new String[8];

            ret[0] =oraCmd.Parameters["NAME"].Value.ToString();
            ret[1] =oraCmd.Parameters["PRODUCTION_DATE"].Value.ToString();
            ret[2] =oraCmd.Parameters["EXPIRATION_DATE"].Value.ToString();
            ret[3] =oraCmd.Parameters["PRICE"].Value.ToString();
            ret[4] =oraCmd.Parameters["DESCRIPTION"].Value.ToString();
            ret[5] =oraCmd.Parameters["QUANTITY"].Value.ToString();
            ret[6] =oraCmd.Parameters["COST"].Value.ToString();
            ret[7] =oraCmd.Parameters["COMPANY"].Value.ToString();

            return ret;
        }

但是当我运行代码时，会出现以下异常：

  

PL \ SQL：数字或值错误

虽然我确定名称和类型。请帮忙。我在这个问题上做了很多努力而没有能够解决它！

Answer 1

我定义了varchar个参数（drugName，description，company）的大小，并且更改了参数名称，就像它们在Oracle代码中一样，例如，{{ 1}}而不是buying。最后通过名称和下面的函数添加绑定工作正常：

COST

如果按位置绑定参数，可能第二步和第三步不是键，但按名称定义更具可读性。以下是我用于测试目的的表结构和示例数据：

public String[] Get_Drug(int id)
{
    OracleConnection con = new OracleConnection();

    con.ConnectionString = "User Id=scott;Password=tiger;Data Source=XE";
    con.Open();

    OracleCommand oraCmd = new OracleCommand();
    oraCmd.Connection = con;
    oraCmd.BindByName = true;
    oraCmd.CommandType = CommandType.StoredProcedure;
    oraCmd.CommandText = "RETREIVE_DRUG";

    OracleParameter[] param = new OracleParameter[9];

    param[0] = new OracleParameter("drugId", OracleDbType.Decimal);
    param[0].Direction = ParameterDirection.Input;
    param[0].Value = id;
    param[1] = new OracleParameter("drugName", OracleDbType.Varchar2);
    param[1].Direction = ParameterDirection.Output;
    param[1].Size = 30;
    param[2] = new OracleParameter("prodDate", OracleDbType.Date);
    param[2].Direction = ParameterDirection.Output;
    param[3] = new OracleParameter("expireDate", OracleDbType.Date);
    param[3].Direction = ParameterDirection.Output;
    param[4] = new OracleParameter("price", OracleDbType.Decimal);
    param[4].Direction = ParameterDirection.Output;
    param[5] = new OracleParameter("description", OracleDbType.Varchar2);
    param[5].Size = 30;
    param[5].Direction = ParameterDirection.Output;
    param[6] = new OracleParameter("quantity", OracleDbType.Decimal);
    param[6].Direction = ParameterDirection.Output;
    param[7] = new OracleParameter("buying", OracleDbType.Decimal);
    param[7].Direction = ParameterDirection.Output;
    param[8] = new OracleParameter("company", OracleDbType.Varchar2);
    param[8].Size = 30;
    param[8].Direction = ParameterDirection.Output;
    oraCmd.Parameters.AddRange(param);

    oraCmd.ExecuteNonQuery();
    con.Close();

    String[] ret = new String[8];
    ret[0] = oraCmd.Parameters["drugName"].Value.ToString();
    ret[1] = oraCmd.Parameters["prodDate"].Value.ToString();
    ret[2] = oraCmd.Parameters["expireDate"].Value.ToString();
    ret[3] = oraCmd.Parameters["price"].Value.ToString();
    ret[4] = oraCmd.Parameters["description"].Value.ToString();
    ret[5] = oraCmd.Parameters["quantity"].Value.ToString();
    ret[6] = oraCmd.Parameters["buying"].Value.ToString();
    ret[7] = oraCmd.Parameters["company"].Value.ToString();
    return ret;
}