如何在c#中创建Databasecommand

Question

我在C#中编写数据库命令,如下所示

 using (SqlConnection con = new SqlConnection(Config.ConnectionString))
        {
            using (SqlCommand cmd = new SqlCommand("INSERT INTO ProjectDetails(pro_name,pro_location,pro_briefdesc,pro_desc,pro_res,pro_contact,pro_add,pro_email,pro_phone) VALUES (@name,@loc,@brief,@desc,@res,@cont,@add,@email,@ph)", con))
            {
                cmd.Parameters.AddWithValue("@name",pro_name);
                cmd.Parameters.AddWithValue("@loc",pro_location );
                cmd.Parameters.AddWithValue("@brief",pro_briefdesc);
                cmd.Parameters.AddWithValue("@desc", pro_desc);
                cmd.Parameters.AddWithValue("@res",pro_res);
                cmd.Parameters.AddWithValue("@cont",pro_contact);
                cmd.Parameters.AddWithValue("@add",pro_add);
                cmd.Parameters.AddWithValue("@email",pro_email);
                cmd.Parameters.AddWithValue("@ph",pro_phone );
                con.Open();
                int modified = cmd.ExecuteNonQuery();
                if (con.State == System.Data.ConnectionState.Open) con.Close();
                return modified;

            }

        }

如何通常打开和关闭我的连接 - 即最小的代码重复(重复).

Answer 1

使用using-statement,您无需关闭连接,因为它已关闭Dispose.

using (SqlConnection con = new SqlConnection(Config.ConnectionString))
{
    using (SqlCommand cmd = new SqlCommand("INSERT INTO ProjectDetails(pro_name,pro_location,pro_briefdesc,pro_desc,pro_res,pro_contact,pro_add,pro_email,pro_phone) VALUES (@name,@loc,@brief,@desc,@res,@cont,@add,@email,@ph)", con))
    {
        cmd.Parameters.AddWithValue("@name",pro_name);
        // ...
        con.Open();
        int modified = cmd.ExecuteNonQuery();
        //con.Close(); <-- not necessary
        return modified;
    }
}