Optional dataUsed for "database" commands to enforce type checking.
Private loggerMaximum number of parameters allowed. -1 for no maximum.
Minimum number of parameters require.
Optional pubUsed when PUB/SUB is in effect.
Optional signSign is used in commands with a compliment command. The only current example is INCR/DECR. Sign is 1 for INCR and -1 for DECR
Optional txUsed in transactions to enqueue a command.
Every command must implement the execute method.
Available since 1.2.0.
EXEC
Executes all previously queued commands in a transaction and restores the connection state to normal.
When using [WATCH]{public link WatchCommand}, EXEC will execute commands only if the watched keys were not modified, allowing for a check-and-set mechanism.
Return value
Array reply: each element being the reply to each of the commands in the atomic transaction.
When using [WATCH]{public link WatchCommand}, EXEC can return a Null reply if the execution was aborted.