如何为 postgres 连接设置 application_name？

Question

I'm using tomcat connection pool org.apache.tomcat.jdbc.pool.DataSource . The connections appear in my database pg_stat_activity with empty application_name .

How could I set that application name in my java app, so I know where each connection comes from (as there will be multiple applications accessing the same db)?

Answer 1

You could specify the application name in the connection string.
Documentation here .

Example:

jdbc:postgresql://localhost:5435/DBNAME?ApplicationName=MyApp

Take care : the param names are case sensitive.

Answer 2

使用设置命令：

set application_name to my_application;

Answer 3

You can add this to the JDBC URL that you use in your connection pool definition:

jdbc:postgresql://localhost/postgres?ApplicationName=my_app

If you want to change it dynamically eg to reflect different modules inside your application, the you can use the SET command as shown by klin.

Answer 4

If you want to set programmatically, the PostgreSQL drivers also have a method you can call:

PGPoolingDataSource ds = new PGPoolingDataSource();
ds.setApplicationName(applicationName);

Answer 5

对于那些使用普通连接字符串而不是 jdbc 的人：

postgresql://other@localhost/otherdb?application_name=myapp

Answer 6

If you're using Python library psycopg2 , here's how you can do

import psycopg2    
psycopg2.connect(host=host_ip, database=db_name, user=user, password=db_pwd, application_name="Python Local Test Script")