使用 OracleCommand 执行 pl/sql 函数 [英] Execute a pl/sql function with OracleCommand

问题描述

我有这个 pl/sql 函数，它唯一做的就是验证用户是否存在于数据库中，如果用户存在则返回Y"但如果用户不存在则返回N"，我想要什么是获取我在 c# 中的 pl/sql 中返回的值.

i have this pl/sql function, the only thing it does is validate that the user exist in the database, if the user exists this returns "Y" but if the user dont exist this return "N", what I want is get the value that I return in pl/sql in c #.

我使用的是 oracle 10g

I am using oracle 10g

            CREATE OR REPLACE FUNCTION KRIST.f_Login (userName IN VARCHAR2,
                                                        password IN VARCHAR2)
            RETURN VARCHAR2 
            IS
                CURSOR USERFINDER IS
                    SELECT IdEmpleado
                    FROM EMPLEADO
                    WHERE Usuario=userName
                    AND Clave=password;
                id number;
                returnVal VARCHAR2(1);
            BEGIN
                OPEN USERFINDER;
                FETCH USERFINDER INTO id; 
                IF(id IS NULL) THEN
                    returnVal:='Y';
                    RETURN returnVal;
                END IF;
                returnVal:='N';
                RETURN returnVal;
                CLOSE USERFINDER;
            END;
            /

我如何执行此功能并在变量中获得结果...我有代码但不起作用

how I can perform this function and get the result in a variable... i have thos code but dont works

                OracleCommand cmd = new OracleCommand("krist.p_login",conn);
                cmd.CommandType = CommandType.StoredProcedure;  // use StoredProcedure with Functions as well
                OracleParameter returnVal = new OracleParameter("returnVal",null);
                OracleParameter p_one = new OracleParameter("userName","kristian");
                OracleParameter p_two = new OracleParameter("password", "kristian");
                returnVal.OracleType = OracleType.VarChar;
                returnVal.Size = 1;
                p_one.OracleType = OracleType.VarChar;
                p_two.OracleType = OracleType.VarChar;
                p_one.DbType = DbType.String;
                p_two.DbType = DbType.String;
                returnVal.DbType = DbType.String;
                returnVal.Direction = ParameterDirection.ReturnValue;
                p_one.Direction = ParameterDirection.Input;
                p_two.Direction = ParameterDirection.Input;
                cmd.Parameters.Add(p_one);
                cmd.Parameters.Add(p_two);
                cmd.Parameters.Add(returnVal);
                cmd.ExecuteNonQuery();
                String bval = Convert.ToString(returnVal.Value);
                return bval;

推荐答案

以下代码适用于我.
注意:您的 pl/sql 代码调用函数 KRIST.f_Login，但您的 c# 调用它 krist.p_login
NB2:您的 pl/sql 代码使用了 Varchar2，但您的 c# 使用了 varchar
NB3:我正在使用 Oracle.DataAccess.dll
NB4:我假设您的返回值缓冲区大小可能为 1，但请尝试不同的大小.

The following code works for me.
NB: Your pl/sql code called the function KRIST.f_Login, but your c# called it krist.p_login
NB2: Your pl/sql code used Varchar2, but your c# used varchar
NB3: I am using Oracle.DataAccess.dll
NB4: I assume your return value buffer size could be 1, but try different sizes.

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

int RETURN_VALUE_BUFFER_SIZE = 32767; 
OracleCommand cmd = new OracleCommand();
try {
    cmd.Connection = conn;
    cmd.CommandText = "KRIST.f_Login";
    cmd.CommandType = CommandType.StoredProcedure;

    cmd.Parameters.Add("returnVal", OracleDbType.Varchar2, RETURN_VALUE_BUFFER_SIZE);  
    cmd.Parameters["returnVal"].Direction = ParameterDirection.ReturnValue;

    cmd.Parameters.Add("userName", OracleDbType.Varchar2);
    cmd.Parameters["userName"].Value = "kristian";

    cmd.Parameters.Add("password", OracleDbType.Varchar2);
    cmd.Parameters["password"].Value = "kristian";

    cmd.ExecuteNonQuery();
    string bval = cmd.Parameters["returnVal"].Value.ToString();
    return bval;
} catch (Exception e) {
    // deal with exception 
} finally {
    command.Dispose();
    connection.Close();
    connection.Dispose();
}

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