Returns an identifying number for the next connection.

Syntax

NEXT_CONNECTION( [ connection-id ] [, database-id ] )

Parameters

Remarks

NEXT_CONNECTION can be used to enumerate the connections to a database. Connection IDs are generally created in monotonically increasing order. This function returns the next connection ID in reverse order.

To get the connection ID value for the most recent connection, enter NULL as the connection-id. To get the subsequent connection, enter the previous return value. The function returns NULL when there are no more connections in the order.

NEXT_CONNECTION is useful if you want to disconnect all the connections created before a specific time. However, because NEXT_CONNECTION returns the connection IDS in reverse order, connections made after the function is started are not returned. If you want to ensure that all connections are disconnected, prevent new connections from being created before you run NEXT_CONNECTION.

Standards and compatibility

Example

The following statement returns an identifier for the first connection on the current database. The identifier is an integer value like 10.

SELECT NEXT_CONNECTION( NULL );

The following statement returns a value like 5.

SELECT NEXT_CONNECTION( 10 );

The following call returns the next connection ID in reverse order from the specified connection-id on the current database.

SELECT NEXT_CONNECTION( connection-id );

The following call returns the next connection ID in reverse order from the specified connection-id (regardless of database).

SELECT NEXT_CONNECTION( connection-id, NULL );

The following call returns the next connection ID in reverse order from the specified connection-id on the specified database.

SELECT NEXT_CONNECTION( connection-id, database-id );

The following call returns the first (earliest) connection (regardless of database).

SELECT NEXT_CONNECTION( NULL, NULL );

The following call returns the first (earliest) connection on the specified database.

SELECT NEXT_CONNECTION( NULL, database-id );