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string

Values can be strings (including binary data) of every kind, for instance you can store a jpeg image inside a value. A value can't be bigger than 512 MB.

  • set
  • get
  • mset
  • mget
  • incr: Increments the integer value of a key by one. Uses 0 as initial value if the key doesn't exist.
  • incrby: Increments the integer value of a key by a number. Uses 0 as initial value if the key doesn't exist.
  • incrbyfloat: Increment the floating point value of a key by a number. Uses 0 as initial value if the key doesn't exist.
  • setex: Sets the string value and expiration time of a key. Creates the key if it doesn't exist.
  • setnx : Set the string value of a key only when the key doesn't exist.

setnx name jasper = set name jasper nx(设置name值，如果存在则不更新) setex name jasper = set name jasper ex 20

incr是原子性的，不会出现多线程同时 操作一个值导致最终的值是错误的 x=10 a：x = x+1 b:x=x+1 x=12(java通过加锁或者aotmicInteger) 因为redis执行命令都是单线程串行执行的