将变量从代码传递到存储过程

Question

我将值传递给存储过程,但它一直给我一个错误错误,将数据类型nvarchar转换为int.需要更改哪些内容才能删除错误？下面是我的实际调用和存储过程

private static string ReturnPhoneNumber()
{
string username = "Roy Orbinson";
string databaseConnection = "Data Source=EmployeeServer;Initial Catalog=StoreInfo;Integrated Security=True;MultipleActiveResultSets=True"; 
SqlConnection connection = new SqlConnection(databaseConnection);
SqlCommand command = new SqlCommand("GimmeThatPhoneNumber", connection);
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add("@username", username);

connection.Open();
var result = Convert.ToString(command.ExecuteScalar());
connection.Close();

return result;
}

SQL:

[dbo].[GimmeThatPhoneNumber]
(
@username int
)

as

Set NoCount On

SELECT phonenumber
FROM personelinformation
where employeename = @username

Answer 1

问题是你的输入参数有一个int类型 - 但需要是一个字符串类型:

[dbo].[GimmeThatPhoneNumber]
(
    @username int
)

@username 应该:

@username nvarchar(200) --pick an appropriate size