func (c RedisCache) Delete(key string) error {
conn := c.pool.Get()
defer conn.Close()
existed, err := redis.Bool(conn.Do("DEL", key))
if err == nil && !existed {
err = ErrCacheMiss
}
return err
}
// check cache's existence in redis.
func (rc *RedisCache) IsExist(key string) bool {
v, err := redis.Bool(rc.do("EXISTS", key))
if err != nil {
return false
}
if v == false {
if _, err = rc.do("HDEL", rc.key, key); err != nil {
return false
}
}
return v
}
func ExampleBool() {
c, err := dial()
if err != nil {
fmt.Println(err)
return
}
defer c.Close()
c.Do("SET", "foo", 1)
exists, _ := redis.Bool(c.Do("EXISTS", "foo"))
fmt.Printf("%#v\n", exists)
// Output:
// true
}
// decrease counter in redis.
func (rc *RedisCache) Decr(key string) error {
_, err := redis.Bool(rc.do("INCRBY", key, -1))
return err
}
func exists(conn redis.Conn, key string) (bool, error) {
return redis.Bool(conn.Do("EXISTS", key))
}