在静态类存储连接(ASP.NET) [英] Storing connection in a static class (ASP.NET)
问题描述
由于我使用PostgreSQL和不能使用LINQ到SQL,我写我自己的包装类。
Since I'm using Postgresql and can't use LINQ to SQL, I wrote my own wrapper classes.
这是学生类的一部分:
public class Student : User
{
private static NpgsqlConnection connection = null;
private const string TABLE_NAME = "students";
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Password { get; set; }
/// <summary>
/// Reads data from the data reader and moves it to the Student class.
/// </summary>
private static void ReadFields(Student student, NpgsqlDataReader dr)
{
student.Id = Int32.Parse(dr["id"].ToString());
student.FirstName = dr["first_name"].ToString();
student.LastName = dr["last_name"].ToString();
student.Password = dr["password"].ToString();
}
/// <summary>
/// Updates the student
/// </summary>
public void Update()
{
Connect();
Run(String.Format("UPDATE " + TABLE_NAME + " SET first_name='{0}', last_name='{1}', password='{2}' WHERE id={3}", FirstName, LastName, Password, Id));
connection.Dispose();
}
/// <summary>
/// Inserts a new student
/// </summary>
public void Insert()
{
Connect();
Run(String.Format("INSERT INTO " + TABLE_NAME + " (first_name, last_name, password) VALUES ('{0}', '{1}', '{2}')",FirstName, LastName, Password));
connection.Dispose();
}
private static void Run(string queryString)
{
NpgsqlCommand cmd = new NpgsqlCommand(queryString, connection);
cmd.ExecuteScalar();
cmd.Dispose();
}
private static void Connect()
{
connection = new NpgsqlConnection(String.Format("Server=localhost;Database=db;Uid=uid;Password=pass;pooling=false"));
connection.Open();
}
//....
所以,当你每看INSERT,DELETE,UPDATE请求我使用的连接(),它连接到数据库的方法。我不知道这是多么愚蠢是之前,我不得不等待10分钟有500行插入,因为有500个连接到数据库。
So as you see with every INSERT, DELETE, UPDATE request I'm using Connect() method which connects to the database. I didn't realize how stupid it was before I had to wait for 10 minutes to have 500 rows inserted, as there were 500 connections to the database.
所以我决定连接属性移动到一个静态DB类。
So I decided to move Connection property to a static DB class.
public static class DB
{
private static NpgsqlConnection connection = null;
public static NpgsqlConnection Connection
{
get
{
if (connection == null)
{
connection = new NpgsqlConnection(String.Format("Server=localhost;Database=db;Uid=uid;Password=pass;pooling=false"));
connection.Open();
}
return connection;
}
}
public static void Run(string queryString)
{
NpgsqlCommand cmd = new NpgsqlCommand(queryString, connection);
cmd.ExecuteScalar();
cmd.Dispose();
}
}
它的工作原理吧!我取代了学生类中的所有运行
中的方法 DB.Run
但我想知道这是否正常工作有很多人在网上,不是只有我。我不知道事情怎么静态使用ASP.NET,也许它会吃大量的内存?..
But I want to know if it will work fine with a lot of people online, not me only. I'm not sure how static things work with ASP.NET, maybe it'll eat a lot of memory?..
推荐答案
这是最好不要存储在一个静态字段连接。根据需要创建连接对象,并让连接池管理的连接。
It is better not to store the connection in a static field. Create the connection object on demand and let the connection pooling manage your connections.
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