Description:
Connect
to the MongoDB server.
Syntax:
mongo_open(url)
Note:
The external library function establishes a connection to the MongoDB server. If parameter username is absent, parameter password can be omitted.
Parameters:
|
url |
mongodb://[username:password@]host1[:port1] [,host2[:port2],...[,hostN[:portN]]]/database[?options/?rows] |
|
username：password |
Username and password; can be omitted |
|
host |
The host name or IP of to-be-connected MongoDB server; at least one value needs to be specified; to connect a replica set, specify multiple host machine IPs |
|
port |
Port number |
|
database |
Database name |
|
options |
MongoDB connection in standard format; can bet omitted |
|
rows |
Number of rows for sampling, which is used to count fields in a table and whose default is 100 |
Return value:
MongoDB connection object
Example:
|
|
A |
|
|
1 |
=mongo_open("mongodb://root:sa@localhost:27017/col") |
With username root, password sa, host name localhost, and port number 27017, connect to database col on MongoDB server |
|
2 |
=mongo_open("mongodb://127.0.0.1:27017/mydb") |
With IP: 127.0.0.1 and port number 27017, connect to database mydb on MongoDB server; no username and password |
|
3 |
=mongo_open("mongodb://127.0.0.1/mydb?safe=true; wtimeoutMS=2000") |
Conncet to database mydb on MongoDB server via IP: 127.0.0.1 in the safe mode; no port number; timeout value is 2 seconds |
|
4 |
=mongo_open("mongodb://127.0.0.1:27017/mydb?rows=1000") |
Connect to database mydb on mong server to get 1000 sampling records through IP:127.0.0.1 and port number 27017 and without a username and a password |