आप नमूने का उपयोग कर सकते हैं
var dbConfig = {
host: '----',
user: '----',
password: '----',
database: '----',
port: ----
};
var connection;
function handleDisconnect() {
connection = mysql.createConnection(dbConfig); // Recreate the connection, since the old one cannot be reused.
connection.connect( function onConnect(err) { // The server is either down
if (err) { // or restarting (takes a while sometimes).
console.log('error when connecting to db:', err);
setTimeout(handleDisconnect, 10000); // We introduce a delay before attempting to reconnect,
} // to avoid a hot loop, and to allow our node script to
}); // process asynchronous requests in the meantime.
// If you're also serving http, display a 503 error.
connection.on('error', function onError(err) {
console.log('db error', err);
if (err.code == 'PROTOCOL_CONNECTION_LOST') { // Connection to the MySQL server is usually
handleDisconnect(); // lost due to either server restart, or a
} else { // connnection idle timeout (the wait_timeout
throw err; // server variable configures this)
}
});
}
handleDisconnect();
