redis的数据类型-String

String

最简单的数据类型：
设置key对应的值为String类型的value,一个key对应一个value,是二进制安全的
* set

set  name  liudyget nameset  name  liudy2(会覆盖，因为key重复)

• setnx
  如果不想覆盖 setnx name liudy3
  (如果存在，返回0，不更新；不存在，则更新)
• setex
  可指定此键值对应的有效期

127.0.0.1:6379> setex haircolor   10  redOK127.0.0.1:6379> get haircolor"red"127.0.0.1:6379> get haircolor(nil)

• setrange(字符串替换)
  如果替换后的没有原来字符串长，则保留原来的

127.0.0.1:6379> set email [e-mail]127.0.0.1:6379> get email"[e-mail]"127.0.0.1:6379> setrange  email 6 qq.com(integer) 13127.0.0.1:6379> get email"[e-mail]"

• mset （一次设置多个key的值）

127.0.0.1:6379> mset key1 liudy1 key2 liudy2OK127.0.0.1:6379> get key1"liudy1"127.0.0.1:6379> get key2

• msetnx
  （只要有一个存在的,所有的都不会覆盖）
• get
• getset
  (获取旧值，设置新值)
• getrange

127.0.0.1:6379> get email"[e-mail]"127.0.0.1:6379> getrange email 0  4"liudy"127.0.0.1:6379> 

• mget(批量获取)

 127.0.0.1:6379> mget key1  key2  key3  key71) "liudy1"2) "liudy2"3) "liudy33"4) (nil)127.0.0.1:6379> 

• incr(递增)

127.0.0.1:6379> set key6 1OK127.0.0.1:6379> get key6"1"127.0.0.1:6379> incr key6(integer) 2127.0.0.1:6379> get key6"2"127.0.0.1:6379> 

• incrby (递增)
  已指定的数增加

127.0.0.1:6379> incrby key6 5(integer) 7127.0.0.1:6379> get key6"7"127.0.0.1:6379> incrby key6 -6(integer) 1127.0.0.1:6379> get key6"1"127.0.0.1:6379> 

• decr(自减)
• decrby（已指定数自减）
• append（追加）

127.0.0.1:6379> get name"liudy2"127.0.0.1:6379> append name -shenyang(integer) 15127.0.0.1:6379> get name"liudy2-shenyang"

• strlen(查看长度)

127.0.0.1:6379> strlen name(integer) 15

public class StringTest {    public static void main(String[] args) {        Jedis jedis = new Jedis("127.0.0.1",6379);        jedis.auth("redis");        //set        Set<String> set = jedis.keys("*");        System.out.println( set.toString());        // set        System.out.println("***set***");        System.out.println(jedis.set("name","liudy"));        // get        System.out.println("***get***");        System.out.println(jedis.get("name"));        // setnx        System.out.println("***setnx***");        System.out.println(jedis.setnx("name","liudy"));        System.out.println(jedis.setnx("age","20"));        // setex        System.out.println("***setex***");        System.out.println(jedis.setex("name",10,"liudy1"));        // setrange        System.out.println("***setrange***");        jedis.set("email","[e-mail]");        jedis.setrange("email",6,"654321");        System.out.println(jedis.get("email"));        // mset        System.out.println("***mset***");        jedis.mset("k1","v1","k2","v2","k3","v3");        System.out.println(jedis.get("k1"));        System.out.println(jedis.get("k2"));        // msetnx        System.out.println("***msetnx***");        jedis.msetnx("k1","v1","k2","v2","k5","v5");// 只要有一个是存在的   所有都不会覆盖        System.out.println(jedis.get("k1"));        System.out.println(jedis.get("k5"));        // get        System.out.println("***get***");        System.out.println(jedis.get("k1"));        // getset        System.out.println("***getset***");        System.out.println(jedis.getSet("k1","v11"));        // getrange        System.out.println("***getrange***");        System.out.println(jedis.getrange("email",6,15));        // mget(批量获取)        System.out.println("***mget***");        System.out.println(jedis.mget("k1","k2","k3"));        // incr(递增)        System.out.println("***incr***");        jedis.set("age","20");        jedis.incr("age");        System.out.println(jedis.get("age"));        // incrby (递增)        System.out.println("***incrby***");        jedis.incrBy("age",5);        System.out.println(jedis.get("age"));        // decr(自减)        System.out.println("***decr***");        jedis.decr("age");        System.out.println(jedis.get("age"));        // decrby（已指定数自减）        System.out.println("***decrby***");        jedis.decrBy("age", 5);        System.out.println(jedis.get("age"));        // append（追加）        System.out.println("***append***");        jedis.append("email","somethingappend");        System.out.println(jedis.get("email"));        // strlen(查看长度)        System.out.println("***strlen***");        System.out.println(jedis.strlen("email"));    }}