*Node.js version*: v4.2.6
*OS*: Linux
*Sql server*: 2012
I have used node js to connect mssql database server. Data's are inserted
into DB continuously
But we are facing connection pool release exception sometimes.
Find the code snippet and issue in below
* Code:*
var sql = require('mssql')
var dbconfig = {
server: 'xxxx',
database: 'xxxx',
user: 'xxx',
password: 'xxx',
port: 'xx'
};
try {
sql.close();
var connection = sql.connect(dbconfig, function (err) {
if (err) console.log(err);
var sqlquery = '';
var request = new sql.Request();
//query to the database and get the repo value
sqlquery = 'select Repo from verylargetable';
request.query(sqlquery, function (err, result) {
if (err) console.log(err)
var repo = result.recordset[0].Repo;
//query to the database and get the commit value
sqlquery = "select Commit from verylargetable where Repo='"
+ repo + "'";
request.query(sqlquery, function (err, result) {
if (err) console.log(err)
var comm = result.recordset[0].Commit;
//query to the database and update the table
sqlquery = "UPDATE verylargetable set Repo='" + repo + "',
WHERE Comm='" + comm + "'";
request.query(sqlquery, function (err, result) {
if (err) console.log(err)
console.log("record(s) updated");
});
});
});
});
}
catch (e) {
console.log("===========Exception Occurred==========");
console.log(e);
console.log(new Date().toString());
console.log(
"==========================================================");
}
*Issue:*
* TypeError: Cannot read property 'release' of null at
ConnectionPool.release
(/usr/lib/Webhook/node_modules/mssql/lib/base.js:199:14) at
Request.userCallback
(/usr/lib/Webhook/node_modules/mssql/lib/tedious.js:608:25) at
Request._this.callback
(/usr/lib/Webhook/node_modules/tedious/lib/request.js:47:27) at
Connection.message
(/usr/lib/Webhook/node_modules/tedious/lib/connection.js:1401:27) at
Connection.dispatchEvent
(/usr/lib/Webhook/node_modules/tedious/lib/connection.js:687:45) at
MessageIO.<anonymous>
(/usr/lib/Webhook/node_modules/tedious/lib/connection.js:602:18) at
emitNone (events.js:67:13) at MessageIO.emit (events.js:166:7) at
ReadablePacketStream.<anonymous>
(/usr/lib/EJ2Webhook/node_modules/tedious/lib/message-io.js:102:16) at
emitOne (events.js:77:13) at ReadablePacketStream.emit (events.js:169:7)*
How to resolve this exception and how to handle exception in query
execution?
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