如何使用C＃.net中的连接字符串连接到远程数据库

Question

every one. I want to connect a remote database using Sql Connection String in C#.net, I am trying it to do, but failed to connect. I am new to C#.net connections to the Database. Can any one pls tell me how to write the Connection String.

Answer 1

检查此网站以获取特定格式： http : //www.connectionstrings.com/

Answer 2

Here is a little bit of code that will connect to a dabase called myDatabase on a server called myServer , query the myTable table for the column myColumn , and insert the returned data into a list of strings.

While by no means exaustive or perfect, this snippet does show some of the core aspects of working with data in C#.

List<string> results = new List<string>();
SqlConnection conn = new SqlConnection("Data Source = myServerAddress; Initial Catalog = myDataBase; User Id = myUsername; Password = myPassword;");
using (SqlCommand command = new SqlCommand())
{
  command.Connection = conn;
  command.CommandType = CommandType.Text;
  command.CommandText = "Select myColumn from myTable";
  using (SqlDataReader dr = command.ExecuteReader())
  {
    while (dr.Read())
    {
      results.Add(dr["myColumn"].ToString());
    }
  }
}

Answer 3

There is no difference in this regard . The connection string to connect to remote server database is written same as you write to connect to local database server.

However, only Data Source changes.

Below is a sample connection string

User ID=dbUserName;Password=dbUserPwd;Initial Catalog=dbName;Data Source=remoteMachine\serverInstanceNameIfAny;

But by default sql server is not configured to Sql Server Authentication , so you need to enable

• Sql server authentication
• Also Create a Log in user in the database

Answer 4

You can also do that in web.config file

<configuration>
<ConnectionStrings>
<add name="YourConnectionString" connectionString="Data Source=Nameofserver;
InitialCatalog=NameofDatabase;Persist Security Info=True;
UserID=DatabaseUserID;Password=DatabasePassword" providerName="System.Data.SqlClient"/>
</connectionStrings>
</configuration>

Answer 5

Here are a couple of examples:

With Integrated Security

Server=RemoteMachineName\Intance; Initial Catalog=DatabaseName; Integrated Security=true;

With username and password

Server=RemoteMachineName\Intance; Initial Catalog=DatabaseName; UID=Username; PWD=Password;