从C＃桌面应用程序向远程服务器上的MySql数据库添加数据

Question

I have a big updated list of strings which must be uploaded with update of each row from 0 to last index by rewriting of exist records and adding of new rows to MySql database on remote server each time user calls function.

The adding of data string by string takes a lot of time even if not hangs by process:

 foreach (string str in myList)
 {
     string Query = "insert into tab(a) values(@a);";
     MySqlConnection conn = new MySqlConnection(connString);
     MySqlCommand conn_ = new MySqlCommand(Query, conn);
     conn.Open();
     conn_.ExecuteNonQuery();
     conn.Close();      
}

My goal is to figure out, what should be most proper way to do this fast. Maybe I should create and update table locally and then somehow upload it to database.

I have a List<string> myList = new List<string>(); which contains about 5000 rows and I have table in database on remote server:

id |  user   | nickname
_____________________
0  |  record | record
1  |  ...    | ...   

My desired result is to update all records from 0 to highest index with adding of new records and removing of extra records in case if current upload contains less records then previous each time from 0 index, of course no maters if index will come with gap between removed rows.

Answer 1

You claim:

Adding of data to MySql database on remote server

Which implies, you have multiple clients who know the connection string to the remote database. This is a security desaster! Stop even thinking about it! Also, what happens if the connection string to the database changes? You need to update every client. The only exception would be, if you are in an trusted environment with trusted connections, but I suspect this, since you are using MySQL .

To your actual problem:

Your main problem is, for every item in your loop you create an connection, send something to the server and close your connection. And again, and again. Basicly you want to send on big command to the server, instead of multiple created by your loop (SQL can handle multiple insert statements at one SQL Command) .

The better (more secure way) :

Create an Application for your server, which accepts myList as JSON for example and save it there. Probably you need to handle authorization here.

Your Client sends a Save Request with a myList to the Application, I have mentioned above.

We have some Technologies for it:

• WebAPI
• WCF
• And many more

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Warning: Also, from a first look, you seem to have a problem with SQL Injections. See what they are , and how you can prevent it .