Redis Ruby Client Learning (v)

One, Redis is a support transaction, please see this introduction.

Here are a few of the commands that Ruby implements, Multi,exec,discard,watch,unwatch.

1,multi: Mark a transaction block start, exec: Execute all multi after the command issued

Require'Redis'R=Redis.newr.set'a', 1R.set'b', 2R.multir.set'a', 3R.set'b', 6R.exec#r.get ' a '#= "3"#r.get ' B '#= "6"

2,discard: Discard all MULTI post-order commands

Require'Redis'R=Redis.newr.set'a', 1R.set'b', 2R.multir.set'a', 3R.set'b', 6R.discard#r.get ' a '#= "1"#r.get ' B '#= "2"

3,watch: Lock key until the multi/exec command is executed

Watch checks for the given key, if from the start of watch, to exec. When the key being monitored changes, the entire transaction fails.

Assume that two Redis links are R1 and R2, respectively.

Require'Redis'R1=Redis.newr1.set'a', 1R1.set'b', 2R1.multir1.set'a', 3R1.set'b', 6#after changing the value of a in R2, exec executesR1.exec#r1.get ' a '#= "1"#r1.get ' B '#= "2"

' Redis '  ='a', 100

4,unwatch:

Refreshes all keys that have been monitored in a transaction. Start watch again.

The difference between transactions in Redis and transactions in MySQL

When an error occurs in a transaction, the operation in the entire transaction is not rolled back

Redis Ruby Client Learning (v)