Postgres Connection String
数据库连接A string is an expression in which there are all the parameters necessary to establish a connection from a terminal device to a database.
It contains databases 用户名, 密码, 名称, 主机地址and 端口.
This connection string can be used localhostwith remote databases running on the host computer.
General format of PostgresSQL connection string
const connectionString = "postgres://<database_username>:<database_userpassword>@<hostaddress>:<port_no>/<database_name>"
You can put the connection string .envinto a ./configure file. Make sure the given user has permissions to perform the operation you are calling.
If the user does not exist or the port number is incorrect, the database connection cannot be established.
The default port address for the Postgres database is 5432. If you are running the database on your machine, you can replace the hostname with localhost.
For example, your username is tester, your password is test123, your database name is contact,, and you localhostare running Postgres using the default port number in .
const URI = "postgres://tester:test123@localhost:5432/contact"
HerokuCreate a Postgres database connection
in
HerokuProvides a free Postgres database. You can create and run it remotely.
Host: ec2-....-8-220.compute-1.amazonaws.com
Database: d3...dk
User: ips....kgfgu
Port: 5432
Password: ce6b.....cea5bf
URI: postgres://ips....kgfgu:ce6b.....cea5bf@ec2-....-8-220.compute-1.amazonaws.com:5432/d3...dk
Heroku CLI: heroku pg:psql postgresql-opaque-10916 --app my_app
Here you can see the credentials; for security purposes some parts are replaced with dots and URI. URIis the connection string.
It would be helpful to have this URIas a parameter to the database connection function. If you notice, you'll see URIthat is just a formatted way of representing the parameter.
More details can be found in the official documentation .
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