Bypass disconnected

Signed-off-by: Walamana <joniogerg@gmail.com>

app.js

@@ -17,17 +17,18 @@ var con = mysql.createConnection({
 con.connect(err => {
     if (err) {
         console.log("Cant connect to MySQL database");
-        throw err;
     }
     console.log("Connected to database!");
 });
 
 
 app.get('/', (req, res) => {
+    if(!isConnected()){res.send("No Connection to database");return}
     res.send("Welcome to the miniplan api!");
 });
 
 app.get('/login', (req, res) => {
+    if(!isConnected()){res.send("No Connection to database");return}
     var username = req.query.username;
     var password = req.query.password;
 
@@ -59,11 +60,12 @@ app.get('/login', (req, res) => {
 });
 
 app.get("/user/:user/update", (req, res) => {
-
+    if(!isConnected()){res.send("No Connection to database");return}
 });
 
 
 app.get("/gottesdienste", (req, res) => {
+    if(!isConnected()){res.send("No Connection to database");return}
     var groupid = req.params.groupid;
     con.query("SELECT ID from gottesdienstgruppe ORDER BY ID DESC LIMIT 1", (err, result) => {
         if (err) throw err;
@@ -76,6 +78,7 @@ app.get("/gottesdienste", (req, res) => {
 });
 
 app.get("/gottesdienste/:groupid", (req, res) => {
+    if(!isConnected()){res.send("No Connection to database");return}
     var groupid = req.params.groupid;
     con.query("SELECT * from gottesdienste WHERE GruppeID='" + groupid + "' ORDER BY  `gottesdienste`.`Datum` ASC LIMIT 0 , 30", (err, result) => {
         if (err) throw err;
@@ -91,6 +94,7 @@ app.get("/groups", (req, res) => {
 });
 
 app.get("/ministranten", (req, res) =>{
+    if(!isConnected()){res.send("No Connection to database");return}
     
     con.query("SELECT UserToken FROM ministranten WHERE UserToken='" + req.cookies.loginToken + "'", (err, result) => {
         var loggedIn = result.length == 1;
@@ -135,6 +139,14 @@ app.listen(3000, () => {
 });
 
 
+function isConnected(){
+    if(con.isConnected){
+        return true;
+    }else{
+        return false;
+    }
+}
+
 
 function removeFromArrayByValue(value, array) {
     var index = array.indexOf(value);