MySQL | CONNECTION_ID( ) Function

The MySQL CONNECTION_ID() function is used for return the connection ID for a current connection in MySQL. The connection ID used to establish a connection to a database is unique for every connection among the connected clients. The CONNECTION_ID() function does not require any parameters or arguments. The value returned by the CONNECTION_ID() function is the same type of value as displayed in the ID column of the INFORMATION_SCHEMA.PROCESSLIST table. Syntax:

CONNECTION_ID()

Parameters Used: The CONNECTION_ID() function does not require any parameters or arguments. Return Value: The MySQL CONNECTION_ID() function returns an integer value which represents the unique current connection ID. Supported Versions of MySQL:

MySQL 5.7
MySQL 5.6
MySQL 5.5
MySQL 5.1
MySQL 5.0
MySQL 4.1
MySQL 4.0
MySQL 3.23

Example: Implementing CONNECTION_ID() function.

SELECT CONNECTION_ID();

Output:

MySQL | CONNECTION_ID( ) Function

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