NodeRed Function Node Crashes - [red] Uncaught Exception: - ibm-cloud

Question

I am having a hard time understanding why my Node-Red Flow keeps crashing with an [RED] Uncaught Exception. It almost seems like the function node is crashing and my code inside of the function node never has a chance to catch it.
I have a very simple Node-Red flow that executes a IBMDB node.js library to insert data into my database. In order to use the IBMDB library, I had to add the package to the list of packages in my packages.json file. I also had to setup a global context variable inside the Bluemix-setings.js file. I named this global context variable IBMDB, which is the equivalent to the require statement. Once that was done, I am able to make use of the library inside a function node.
** Here is the Node.js IBMDB library, I am using.
https://github.com/ibmdb/node-ibm_db
** Here is the Flow
** Here is the code inside the function.
try {
context.global.ibmdb.open("DATABASE=database;HOSTNAME=hostname;PORT=port;PROTOCOL=TCPIP;UID=username;PWD=password;", function (err,conn) {
conn.beginTransaction(function (err) {
if (err) {
//could not begin a transaction for some reason.
console.log(err);
return conn.closeSync();
}
for (i = 0; i < msg.payload.Readings.length; i++)
{
var result = conn.querySync("INSERT INTO db2.table (" +
"I_ID," +
"D_ID," +
"field1," +
"field2," +
"field3," +
"field4," +
"field5," +
"field6," +
"field7," +
"field8," +
"field9," +
"field10)" +
"values (" +
"1A," +
"'"+ msg.payload.field1 + "',"+
"'" + JSON.stringify(msg.payload.Readings[i].field2) + "'," +
msg.payload.Readings[i].field3 + ","+
msg.payload.Readings[i].field4 + ","+
msg.payload.Readings[i].field5 + ","+
msg.payload.Readings[i].field6 + ","+
msg.payload.Readings[i].field7 + ","+
msg.payload.Readings[i].field8 + ","+
msg.payload.Readings[i].field9 + ","+
msg.payload.Readings[i].field10 + ","+
"'2016-05-31 22:28:51.000000'" +
");");
}
conn.commitTransaction(function (err) {
if (err) {
//error during commit
console.log("****ERROR: " + err);
node.error("**** ERROR: ", err);
//return conn.closeSync();
}
//Close the connection
conn.closeSync();
});
});
});
} catch (e) {
node.error("**** ERROR: ", err);
}
When I run this with a valid SQL statement and all the data types are correctly sent, I get no errors. Everything works!!
*** The issue: When I did some testing to force a SQL error, the Node-Red instance crashes. I forced the error by sending a valid SQL statement, but the data elements in one of the fields is a non-numeric value where the table definition is expecting numeric only. I see in the error logs (console out) two lines..
The error SQL error message displayed is exactly what I was expecting to catch in my application. Instead the application just crashes.
[red] Uncaught Exception: Error: [IBM][CLI Driver][DB2/LINUXX8664]
SQL0103N The numeric literal "1A" is not valid. SQLSTATE=42604
Any insight on what is really happening would be greatly appreciated. I am wondering if I put this code inside a custom built node would I be able to catch the error. Could this be a limitation of using the function node as a wrapper to my code. ????
*

Answer 1

Try wrapping the conn.querySync call in it's own try/catch block. The current block is out of scope because the call happens in another function (the one passed into beginTransaction).
e.g.
try {
context.global.ibmdb.open("DATABASE=database;HOSTNAME=hostname;PORT=port;PROTOCOL=TCPIP;UID=username;PWD=password;", function (err,conn) {
conn.beginTransaction(function (err) {
if (err) {
//could not begin a transaction for some reason.
console.log(err);
return conn.closeSync();
}
for (i = 0; i < msg.payload.Readings.length; i++)
{
try {
var result = conn.querySync("INSERT INTO db2.table (" +
"I_ID," +
"D_ID," +
"field1," +
"field2," +
"field3," +
"field4," +
"field5," +
"field6," +
"field7," +
"field8," +
"field9," +
"field10)" +
"values (" +
"1A," +
"'"+ msg.payload.field1 + "',"+
"'" + JSON.stringify(msg.payload.Readings[i].field2) + "'," +
msg.payload.Readings[i].field3 + ","+
msg.payload.Readings[i].field4 + ","+
msg.payload.Readings[i].field5 + ","+
msg.payload.Readings[i].field6 + ","+
msg.payload.Readings[i].field7 + ","+
msg.payload.Readings[i].field8 + ","+
msg.payload.Readings[i].field9 + ","+
msg.payload.Readings[i].field10 + ","+
"'2016-05-31 22:28:51.000000'" +
");");
} catch (excp) {
//do stuff
}
}
conn.commitTransaction(function (err) {
if (err) {
//error during commit
console.log("****ERROR: " + err);
node.error("**** ERROR: ", err);
//return conn.closeSync();
}
//Close the connection
conn.closeSync();
});
});
});
} catch (e) {
node.error("**** ERROR: ", e);
}