我使用下面的代碼將我的節點連接到mysql,用於我在我的項目中使用的所有休息apis; 我已經把它作爲我所有查詢請求的常用數據庫連接文件。mysql連接丟失錯誤nodejs
var mysql = require('mysql');
var db_connect = (function() {
function db_connect() {
mysqlConnConfig = {
host: "localhost",
user: "username",
password: "password",
database: "db_name"
};
}
db_connect.prototype.unitOfWork = function (sql) {
mysqlConn = mysql.createConnection(mysqlConnConfig);
try {
sql(mysqlConn);
} catch (ex) {
console.error(ex);
} finally {
mysqlConn.end();
}
};
return db_connect;
})();
exports.db_connect = db_connect;
上面的代碼工作正常,我將使用我的查詢執行'sql'如下所示在我所有的休息API如下。
var query1 = "SELECT * FROM table1";
sql.query(query1,function(error,response){
if(error){
console.log(error);
}
else{
console.log(response);
}
})
一切都很好至今,但問題是我正在8-12小時運行後得到的SQL協議連接錯誤 我永遠的模塊
forever start app.js
我開始我的項目與上述永遠的模塊。 8-12小時後,我得到了下面的錯誤,我所有的休息api都無法正常工作或正在關閉。
"stack": ["Error: Connection lost: The server closed the connection.", " at Protocol.end (/path/to/my/file/node_modules/mysql/lib/protocol/Protocol.js:109:13)", " at Socket.<anonymous> (/path/to/my/file/node_modules/mysql/lib/Connection.js:102:28)", " at emitNone (events.js:72:20)", " at Socket.emit (events.js:166:7)", " at endReadableNT (_stream_readable.js:913:12)", " at nextTickCallbackWith2Args (node.js:442:9)", " at process._tickDomainCallback (node.js:397:17)"],
"level": "error",
"message": "uncaughtException: Connection lost: The server closed the connection.",
"timestamp": "2017-09-13T21:22:25.271Z"
然後,我就在我的研究解決如下配置手柄斷開。 但我正在努力配置我的sql連接如下所示與我的代碼。
var db_config = {
host: 'localhost',
user: 'root',
password: '',
database: 'example'
};
var connection;
function handleDisconnect() {
connection = mysql.createConnection(db_config); // Recreate the connection, since
// the old one cannot be reused.
connection.connect(function(err) { // The server is either down
if(err) { // or restarting (takes a while sometimes).
console.log('error when connecting to db:', err);
setTimeout(handleDisconnect, 2000); // 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(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();
任何人都可以幫我改變我的代碼與上述代碼?
是增加那些超時會給任何其他的錯誤? – Jagadeesh
你認爲這將是我的問題的原因? – Jagadeesh
增加了關於max_connections –