• Ivy Seo

Print out data from PostgreSQL table in C#

private static void PrintOutResult()


// connect to postgresql

var cs = "Host=HOST.postgres.database.azure.com; Username=USERNAME; Password=PW; Database=DB";

using var con = new NpgsqlConnection(cs);



string sql = "SELECT id FROM m7_data_table ORDER BY m7_data_table DESC LIMIT 3";

using var cmd = new NpgsqlCommand(sql, con);

using NpgsqlDataReader rdr = cmd.ExecuteReader();

while (rdr.Read())


Console.WriteLine("{0}", rdr.GetInt32(0));


Console.WriteLine("Successfully printed out");


#C #PostgreSQL

Recent Posts

See All

Generate unique filename: UUID, Path

A: using UUID let my_uuid = Uuid::new_v4(); let file_created = File::create(my_uuid.to_string()).expect("create file failed");     println!("uuid: {}", my_uuid); //  buffer write let mut file_ge

JSON - write .txt file in Rust

pub fn serialize_writeFile(data : &full_data ) -> Result<bool, modbus::Error> { // 1) takes data  // this function takes the m7_data object and serializes the contents and saves the results to a text

Serialize/Deserialize JSON in Rust

This README has some good examples. To deserialize in Rust: use serde::{Deserialize, Serialize}; use serde_json::Result; #[derive(Serialize, Deserialize)] struct Person {     name: String,     age: u