必须声明标量变量“@Id”
SqlConnection con = new SqlConnection(@"connectionstring");
con.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandText = ("SELECT Goal from Planning WHERE Id = @Id");
int goal = (int)cmd.ExecuteScalar();
有人能帮我吗?
你应该给你的参数一个值
cmd.Parameters.AddWithValue("@Id", value);
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