Created
July 2, 2019 18:40
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Reusing the Database Connection
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| const mongodb = require('mongodb'); | |
| const uri = 'mongodb+srv://OMITTED/test'; | |
| // May be retained between function executions depending on whether Azure | |
| // cleans up memory | |
| let client = null; | |
| module.exports = function (context, req) { | |
| context.log('Running'); | |
| let hasClient = client != null; | |
| if (client == null) { | |
| mongodb.MongoClient.connect(uri, function(error, _client) { | |
| if (error) { | |
| context.log('Failed to connect'); | |
| context.res = { status: 500, body: res.stack } | |
| return context.done(); | |
| } | |
| client = _client; | |
| context.log('Connected'); | |
| query(); | |
| }); | |
| } else { | |
| query(); | |
| } | |
| function query() { | |
| client.db('test').collection('tests').find().toArray(function(error, docs) { | |
| if (error) { | |
| context.log('Error running query'); | |
| context.res = { status: 500, body: res.stack } | |
| return context.done(); | |
| } | |
| context.log('Success!'); | |
| context.res = { | |
| headers: { 'Content-Type': 'application/json' }, | |
| body: 'Num docs ' + docs.length + ', reused connection ' + hasClient | |
| }; | |
| context.done(); | |
| }); | |
| } | |
| }; |
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