75 lines
5.2 KiB
HTML
75 lines
5.2 KiB
HTML
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<script type="text/html" data-help-name="mongodb">
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<p>Define a connection method to your MongoDB server instance.</p>
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<p>There are 3 supported options:
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<details><summary>Standard/direct</summary>
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For databases that request connections in the form
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<code>
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mongodb://[username]:[password]@[hostname]:[port]/[dbname]
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</code>
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Most often used for local MongoDB instances (localhost:27017), and other stand-alone instances.
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</details>
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<details><summary>Standard/replicaset</summary>
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For databases that request connections in the form
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<code>
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mongodb://[username]:[password]@[hostnameA]:[port],[hostnameB]:[port]/[dbname]?replicaSet=[replsetname]
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</code>
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Often used with <q>database as a service</q> offerings,
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or on-premises instances that have been configured for availability and resilience
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</details>
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<details><summary>Clustered by DNS seedlist</summary>
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For databases that request connections in the form
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<code>
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mongodb+srv://[username]:[password]@[clustername]/[dbname]?retryWrites=true&w=majority
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</code>
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A configuration of MongoDB instances that provide availability and performance
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through replication and sharding, accessed through a cluster alias name, rather than
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by specific host:port connections. This is the default for MongoDB instances in the
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<a href="https://www.mongodb.com/cloud/atlas" target="_blank">Atlas cloud service</a>.
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</details>
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<p><strong>Connect options</strong> is where you add the optional parameters required by your MongoDB instance.
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This might include:
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<ul><li>w=majority</li><li>replicaSet=replset</li><li>authSource=admin</li></ul> and any other options appropriate -
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full set available at <a href="https://docs.mongodb.com/manual/reference/connection-string/" target="_blank">
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Connection String URI Format — MongoDB Manual</a>.
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<p>If you are connecting to <a href="https://cloud.ibm.com/catalog/services/databases-for-mongodb-group" target="_blank">
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IBM Databases for MongoDB</a>, as a replica-set, be sure to append <code>ssl=true&tlsAllowInvalidCertificates=true </code>
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to the <strong>Connect options</strong>.
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</script>
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<script type="text/html" data-help-name="mongodb out">
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<p>A simple MongoDB output node. Can save, insert, update and remove objects from a chosen collection.</p>
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<p>Save will update an existing object or insert a new object if one does not already exist.</p>
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<p>Insert will insert a new object.</p>
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<p>Save and insert either store <code>msg</code> or <code>msg.payload</code>.</p>
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<p>Update will modify an existing object or objects. The query to select objects to update uses <code>msg.query</code>
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and the update to the element uses <code>msg.payload</code>. If <code>msg.query._id</code> is
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a valid mongo ObjectId string it will be converted to an ObjectId type.</p>
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<p>Update can add a object if it does not exist or update multiple objects.</p>
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<p>Remove will remove objects that match the query passed in on <code>msg.payload</code>. A blank query will delete
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<i>all of the objects</i> in the collection.</p>
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<p>You can either set the collection method in the node config or on <code>msg.collection</code>. Setting it in the
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node will override <code>msg.collection</code>.</p>
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<p>By default MongoDB creates an <i>_id</i> property as the primary key - so repeated injections of the
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same <code>msg</code> will result in many database entries.</p>
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<p>If this is NOT the desired behaviour - ie. you want repeated entries to overwrite, then you must set
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the <code>msg._id</code> property to be a constant by the use of a previous function node.</p>
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<p>This could be a unique constant or you could create one based on some other msg property.</p>
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<p>Currently we do not limit or cap the collection size at all... this may well change.</p>
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</script>
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<script type="text/html" data-help-name="mongodb in">
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<p>Calls a MongoDB collection method based on the selected operator.</p>
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<p>Find queries a collection using the <code>msg.payload</code> as the query statement as per the .find() function.
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Optionally, you may also (via a function) set a <code>msg.projection</code> object to constrain the returned
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fields, a <code>msg.sort</code> object, a <code>msg.limit</code> number and a <code>msg.skip</code> number.</p>
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<p>Count returns a count of the number of documents in a collection or matching a query using the
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<code>msg.payload</code> as the query statement.</p>
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<p>Aggregate provides access to the aggregation pipeline using the <code>msg.payload</code> as the pipeline array.</p>
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<p>You can either set the collection method in the node config or on <code>msg.collection</code>. Setting it in
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the node will override <code>msg.collection</code>.</p>
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<p>See the <a href="http://docs.mongodb.org/manual/reference/method/db.collection.find/" target="new"><i>MongoDB
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collection methods docs</i></a> for examples.</p>
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<p>The result is returned in <code>msg.payload</code>.</p>
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</script>
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