Redis/Jedis - Delete by pattern?

Question

Normally, I get the key set then use a look to delete each key/value pair.

Is it possible to just delete all keys via pattern?

ie:

Del sample_pat         


        

Answer 1

You should try using eval. I'm no Lua expert, but this code works.

private static final String DELETE_SCRIPT_IN_LUA =
    "local keys = redis.call('keys', '%s')" +
    "  for i,k in ipairs(keys) do" +
    "    local res = redis.call('del', k)" +
    "  end";

public void deleteKeys(String pattern) {
  Jedis jedis = null;

  try {
    jedis = jedisPool.getResource();

    if (jedis == null) {
      throw new Exception("Unable to get jedis resource!");
    }

    jedis.eval(String.format(DELETE_SCRIPT_IN_LUA, pattern));  
  } catch (Exception exc) {
    if (exc instance of JedisConnectionException && jedis != null) {
      jedisPool.returnBrokenResource(jedis);
      jedis = null;
    }

    throw new RuntimeException("Unable to delete that pattern!");
  } finally {
    if (jedis != null) {
      jedisPool.returnResource(jedis);
    }
  }
}

And then call:

deleteKeys("temp:keys:*");

This guarantees a one server-side call, multiple delete operation.