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  liudy
get name
set  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  red
OK
127.0.0.1:6379> 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 liudy@111.com
OK
127.0.0.1:6379> get email
"liudy@111.com"
127.0.0.1:6379> setrange  email 6 qq.com
(integer) 13
127.0.0.1:6379> get email
"liudy@qq.comm"

• mset （一次设置多个key的值）

127.0.0.1:6379> mset key1 liudy1 key2 liudy2
OK
127.0.0.1:6379> 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
"liudy@qq.comm"
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  key7
1) "liudy1"
2) "liudy2"
3) "liudy33"
4) (nil)
127.0.0.1:6379> 

• incr(递增)

127.0.0.1:6379> set key6 1
OK
127.0.0.1:6379> get key6
"1"
127.0.0.1:6379> incr key6
(integer) 2
127.0.0.1:6379> 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) 7
127.0.0.1:6379> get key6
"7"
127.0.0.1:6379> incrby key6 -6
(integer) 1
127.0.0.1:6379> 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) 15
127.0.0.1:6379> 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","liudy@123456.com");
        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"));
    }
}