MySQL CONNECTION_ID() Function

The CONNECTION_ID() function in MySQL returns a unique identifier for the current connection to the database server. This ID is useful for tracking and managing connections.

CONNECTION_ID(): Definition and Usage

Each time a client connects to a MySQL server, a unique connection ID is assigned. This ID persists for the duration of that connection. The CONNECTION_ID() function provides a way to access this ID within your SQL queries. This can be helpful for debugging, monitoring, or managing multiple client connections to the database.

Syntax

The syntax is very simple; the function doesn't take any arguments:

Syntax

CONNECTION_ID()

Example

Retrieving the Connection ID

This query will return the unique ID for your current database connection.

Syntax

SELECT CONNECTION_ID();
Output

(A unique integer representing your current connection ID.  Example: 12345)
**Note:** The example output shows a sample connection ID (12345). The actual ID returned by `CONNECTION_ID()` will be a unique integer that's specific to your current connection to the MySQL server. The ID will be different each time you establish a new connection.