Two ways of connecting SQLServer in Visual Studio
- 2020-06-23 00:09:45
- OfStack
1. There are two ways to connect Sql Server to Visual Studio:
(1) Local computer connection;
(2) windows authentication connection;
2. Use in Visual Studio:
Example 1: Query the data in the database and display it
Example 2: Delete the data in the table
Example 3: Modify the data in the table
Example 4: Insert data into the table
(1) Local computer connection;
string s = "Data Source= Computer name ;initial Catalog= Database name ;integrated Security=True";
(2) windows authentication connection;
string cc="Data Source = Computer name ; Initial Catalog = Database name ; User ID = sa; Password = Your password ";
2. Use in Visual Studio:
Example 1: Query the data in the database and display it
string s = "Data Source= Computer name ;Initial Catalog= Database name ;Integrated Security=True"; // The local computer connection is used here
SqlConnection conn = new SqlConnection(s); // Create a connection
conn.Open(); // Open the connection
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "select * from T_User"; // Using the command
SqlDataAdapter adapter=new SqlDataAdapter(cmd);
DataTable dt=new DataTable();
adapter.Fill(dt);
conn.Dispose(); // Release all the resources
cmd.Dispose();
conn.Close(); // Close the connection
string realname="";
string username="";
string mobile="";
string address="";
for (int i=0;i<dt.Rows.Count;i++)
{
realname=dt.Rows[i][3].ToString();
username=dt.Rows[i][1].ToString();
mobile=dt.Rows[i][4].ToString();
address=dt.Rows[i][5].ToString();
Console.WriteLine(" Name for {0}, The user is called {1} , a mobile phone for {2}, Address is {3}", realname, username, mobile, address);
}
Console.ReadKey();
Example 2: Delete the data in the table
string cc="Data Source = Computer name ; Initial Catalog = Database name ; User ID = sa; Password = Your password "; // use windows The authentication
SqlConnection conn = new SqlConnection(s);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "delete from T_User where Id=5";
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
Console.WriteLine(" Delete the success ");
Console.ReadKey();
Example 3: Modify the data in the table
string s = "Data Source= Computer name ;initial Catalog= Database name ;integrated Security=True";
SqlConnection conn = new SqlConnection(s);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "update T_User set Card=@card where ID=3";
cmd.Parameters.AddWithValue("@card", "13000000000000");
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
conn.Dispose();
Console.WriteLine(" Modified successfully! ");
Console.ReadKey();
Example 4: Insert data into the table
string s = "data source= Computer name ;initial catalog= Database name ;integrated security=true";
SqlConnection conn = new SqlConnection(s);
conn.Open();
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = "insert into T_User(UserName,Password,RealName,Mobile,Address) values(@username,@password,@realname,@mobile,@address)";
cmd.Parameters.AddWithValue("@username", "xingxing");
cmd.Parameters.AddWithValue("@password", "77777");
cmd.Parameters.AddWithValue("@realname", " The stars ");
cmd.Parameters.AddWithValue("@mobile", 1300000000);
cmd.Parameters.AddWithValue("@address", " Beijing, Hebei Province ");
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
conn.Dispose();
Console.WriteLine(" Successful insertion 1 line ");
Console.ReadKey();