How to achieve a read only connection using pymongo

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6 Answers

achievepymongousingconnection
90%

mongodb:// is a required prefix to identify that this is a string in the standard connection format,,host1 is the only required part of the URI

Example_snippet/controller/utility/_achieve.js/ MongoClient = function(server,. . .
MongoClient = function(server, options);

MongoClient.prototype.open

MongoClient.prototype.close

MongoClient.prototype.db

MongoClient.connect
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88%

When I query for a document by ObjectId in my web application I get no result,PyMongo is thread-safe and provides built-in connection pooling for threaded applications,,How does connection pooling work in PyMongo?,It’s common in web applications to encode documents’ ObjectIds in URLs, like:

Example_snippet/controller/utility/_achieve.js/ client = MongoClient(host, por. . .
client = MongoClient(host, port)
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72%

In this tutorial, we will be using Mongo Shell to create users,,Create read-only access to the specified database,Create read-only access to all of the databases exclude local and config databases

Example_snippet/controller/utility/_achieve.js/ use admin; // Make sure we go . . .
use admin; // Make sure we go to the admin database // Create devA user and read access only to client DB. db.createUser({   user: "devA",   pwd: "devA",  roles: [ { role: "read", db: "client" } ] });
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65%

Configure Read Preference,Read Preference Modes,Default mode, All operations read from the current replica set primary

Example_snippet/controller/utility/_achieve.js/ primary. . .
primary
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75%

How to achieve a read-only connection to the secondary nodes of the MongoDB, I have a primary node and two secondary nodes

Example_snippet/controller/utility/_pymongo.js/ >>> client = MongoClient( ... . . .
>>> client = MongoClient(
      ...'localhost:27017',
      ...replicaSet = 'foo',
      ...readPreference = 'secondaryPreferred') >>>
   client.read_preference
SecondaryPreferred(tag_sets = None)
40%

You'll want to specify a Read Preference on your queries, A read preference of Secondary Preferred will send queries to a Secondary node but will fall back to the Primary in the event that a Secondary is not available

Example_snippet/controller/utility/_pymongo.js/ >>> client = MongoClient( ... . . .
>>> client = MongoClient(
      ...'localhost:27017',
      ...replicaSet = 'foo',
      ...readPreference = 'secondaryPreferred') >>>
   client.read_preference
SecondaryPreferred(tag_sets = None)