Lua table insert multiple values
However, one thing to caution here is that if the first write command does not use additional memory such as DEL, LREM, or SREM, etc, Redis will allow it to run and all subsequent commands in the Lua script will execute to completion for atomicity. When the memory usage in Redis exceeds the maxmemory limit, the first write command encountered in the Lua script that uses additional memory will cause the script to abort (unless redis.pcall was used). The script can pass the exact error to the user by returning the error object Returned in the format specified above (as a Lua table with an err field). Using redis.pcall() no error is raised, but an error object is (error) ERR Error running script (call to f_6b1bf486c81ceb7edf3c093f4c48582e38c0e791): ERR Operation against a key holding the wrong kind of value > eval "return redis.call('get','foo')" 0 Makes it obvious that the error was generated by a script: > del foo Will stop the execution of the script and return an error, in a way that *Error handlingĪs already stated, calls to redis.call() resulting in a Redis command error Is running no other client can execute commands. If you are going to use slow scripts you should be aware that while the script It is not hard to create fast scripts, as the script overhead is very low, but However this also means that executing slow scripts is not a good idea. This semantic is similar to the one of MULTI / EXEC.įrom the point of view of all the other clients the effects of a script areĮither still not visible or already completed. Script or Redis command will be executed while a script is being executed. Redis uses the same Lua interpreter to run all the commands.Īlso Redis guarantees that a script is executed in an atomic way: no other The following example should clarify what stated above: > eval "return
![lua table insert multiple values lua table insert multiple values](https://cdn.educba.com/academy/wp-content/uploads/2021/01/Lua-Array.jpg)
).Īll the additional arguments should not represent key names and can be accessedīy Lua using the ARGV global variable, very similarly to what happens with The arguments can be accessed by Lua using the KEYS global variable in theįorm of a one-based array (so KEYS, KEYS. (starting from the third argument) that represent Redis key names.
![lua table insert multiple values lua table insert multiple values](https://www.enterprisedb.com/images/ombres/ombre-cyan-5-to-indigo-6.jpg)
The second argument of EVAL is the number of arguments that follows the script It is just a Lua program that will run in the context of the Redis server. The script does not need to define a Lua function (and should not). The first argument of EVAL is a Lua 5.1 script. *Introduction to EVALĮVAL and EVALSHA are used to evaluate scripts using the Lua interpreterīuilt into Redis starting from version 2.6.0. Time complexity: Depends on the script that is executed.