C#:如何为 SQL Server 存储过程使用参数? [英] C# : how to use parameters for SQL Server stored procedure?

问题描述

我想使用 C# 中的存储过程从 SQL Server 表中获取数据.我想用我将作为参数传递的 id 打印城市，但我不知道在 C# 中的存储过程中使用类似参数的正确语法.

I want to use stored procedures in C# to get data from a SQL Server table. I want to print the city with the id that I'll pass as a parameter, but I don't know the correct syntax of using parameters like that for a stored procedure in C#.

这是我使用的 C# 代码:

This is the C# code that I'm using:

string connString = ConfigurationManager.ConnectionStrings["MyConnString"].ConnectionString;

using (SqlConnection conn = new SqlConnection(connString))
{
    conn.Open();

    SqlCommand command = new SqlCommand("SP_GetCityByID where id = 2", conn);
    command.CommandType = CommandType.StoredProcedure;

    SqlParameter param = command.Parameters.Add("@ID", SqlDbType.Int);
    param.Direction = ParameterDirection.Input;

    command.ExecuteNonQuery();

    Console.WriteLine(param.Value);
}

推荐答案

SqlCommand command = new SqlCommand("SP_GetCityByID ", conn);

在调用存储过程时，不要放置 where 条件.where 条件需要在存储过程的主体内，它应该将您的城市表的 id 列与您传递给的 @ID 参数进行比较存储过程.其次，您在最后编写的 ExecuteNonQuery 函数不会满足您的目的.使用 ExecuteScalar 函数代替，如下所示:

You don't put a where condition when you call a stored procedure. where condition needs to be inside the body of stored procedure which should compare the id column of your city table with @ID parameter you are passing to stored procedure. Secondly, ExecuteNonQuery function which you have written at the end will not serve your purpose. Use ExecuteScalar function instead as given below:

String cityName= command.ExecuteScalar();

我假设您的存储过程接受参数 @ID 并以表格的形式返回匹配的城市名称.

I am assuming your stored procedure accepts parameter @ID and returns matching city name in the form of table.

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