node.js操作数据库

var sys = require('sys');
  
var Client = require('mysql').Client;
var client = new Client();
  
client.user = 'someuser';
client.password = 'password';
  
console.log('Connecting to MySQL...');
  
client.connect(function(error, results) {
if(error) {
console.log('Connection Error: ' + error.message);
return;
}
console.log('Connected to MySQL');
ClientConnectionReady(client);
});
  
ClientConnectionReady = function(client)
{
client.query('USE NodeSample', function(error, results) {
if(error) {
console.log('ClientConnectionReady Error: ' + error.message);
client.end();
return;
}
ClientReady(client);
});
};
  
ClientReady = function(client)
{
var values = ['Chad', 'Lung', 'Hello World'];
client.query('INSERT INTO MyTable SET firstname = ?, lastname = ? , message = ?', values,
function(error, results) {
if(error) {
console.log("ClientReady Error: " + error.message);
client.end();
return;
}
console.log('Inserted: ' + results.affectedRows + ' row.');
console.log('Id inserted: ' + results.insertId);
}
);
GetData(client);
}
  
GetData = function(client)
{
client.query(
'SELECT * FROM MyTable',
function selectCb(error, results, fields) {
if (error) {
console.log('GetData Error: ' + error.message);
client.end();
return;
}
// Uncomment these if you want lots of feedback
//console.log('Results:');
//console.log(results);
//console.log('Field metadata:');
//console.log(fields);
//console.log(sys.inspect(results));
  
if(results.length > 0)
{
var firstResult = results[0];
console.log('First Name: ' + firstResult['firstname']);
console.log('Last Name: ' + firstResult['lastname']);
console.log('Message: ' + firstResult['message']);
}
});
  
client.end();
console.log('Connection closed');
};