Node.js mysql module

var mysql = require("mysql");
var connection = mysql.createConnection({
  "host": "127.0.0.1",
  "database": "test"
});/*from  w w w  . j a  va  2  s .  c  o  m*/
//Open MySQL server connection
connection.connect(function(error) {
  if(error) {
    console.log("There was an error connecting to the MySQL server.", error);
  } else {
    //Insert some test data
    console.log("Inserting test data into test_table.")
    connection.query("INSERT INTO test_table SET ?", {"data":"test"}, function(error, result) {
      if(error) {
        console.log("There was an error instering data into test_table: ", error);
      } else {
        console.log("Successfully inserted data into test_table: ", result);
      }
    });
    //Query the inserted test data
    console.log("Selecting data from test_table.");
    connection.query("SELECT * FROM test_table", function(error, result) {
      if(error) {
        console.log("There was an error selecting data from test_table: ", error);
      } else {
        console.log("Data selected from test_table: ", result);
      }
    });
    //Close the MySQL server connection
    console.log("Closing connection to the MySQL server.");
    connection.end(function(error) {
      if(error) {
        console.log("There was an error while disconnecting from the MySQL server: ", error);
      } else {
        console.log("Successfully disconnected from the MySQL server.");
      }
    });
  }
});