写在前面的话:读书破万卷,编码如有神
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1、对Hash类型的操作命令
1.1、hset:设置值。格式是:hset hash的key 项的key 项的值
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 /**
4 * redis中对于hash类型的: hset 操作示例
5 * hset:设置值。格式是:hset hash的key 项的key 项的值
6 */
7 public class Hash_hset_operation {
8 public static void main(String[] args) {
9 Jedis jedis = new Jedis("127.0.0.1",6379);
10 /**
11 * 示例1: hset hash的key 项的key 项的值
12 */
13 jedis.hset("myhash","id","3");
14 jedis.hset("myhash","name","xiaohong");
15 jedis.hset("myhash","age","13");
16 }
17 }
1.2、hmset:同时设置多对值。格式是:hmset hash的key 项的key 项的值。(项的key和项的值可以多对)
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.HashMap;
4 import java.util.Map;
5
6 /**
7 * redis中对于hash类型的: hmset 操作示例
8 * hmset:同时设置多对值。格式是:hmset hash的key 项的key 项的值。(项的key和项的值可以多对)
9 */
10 public class Hash_hmset_operation {
11 public static void main(String[] args) {
12 Jedis jedis = new Jedis("127.0.0.1",6379);
13 /**
14 * 示例1: hmset hash的key 项的key 项的值。(项的key和项的值可以多对)
15 */
16 Map<String,String> map = new HashMap<>();
17 map.put("id","1");
18 map.put("name","dongdong");
19 map.put("age","3");
20 jedis.hmset("myhash",map);
21 }
22 }
1.3、hget:获取值。格式是:hget hash的key 项的key
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 /**
4 * redis中对于hash类型的: hget 操作示例
5 * hget:获取值。格式是:hget hash的key 项的key
6 */
7 public class Hash_hget_operation {
8 public static void main(String[] args) {
9 Jedis jedis = new Jedis("127.0.0.1",6379);
10 /**
11 * 示例1: hget hash的key 项的key
12 */
13 String id = jedis.hget("myhash", "id");
14 String name = jedis.hget("myhash", "name");
15 String age = jedis.hget("myhash", "age");
16
17 System.out.println(String.format("id = %s, name = %s, age = %s",id,name,age));
18 }
19 }
1.4、hmget:同时获取多对值。格式是:hmget hash的key 项的key。(项的key可以有多个)
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.List;
4
5 /**
6 * redis中对于hash类型的: hmget 操作示例
7 * hmget:同时获取多对值。格式是:hmget hash的key 项的key。(项的key可以有多个)
8 */
9 public class Hash_hmget_operation {
10 public static void main(String[] args) {
11 Jedis jedis = new Jedis("127.0.0.1",6379);
12 /**
13 * 示例1: hmget hash的key 项的key。(项的key可以有多个)
14 */
15 List<String> hmget = jedis.hmget("myhash", "id", "name", "age");
16 System.out.println("hmget = " + hmget);
17 }
18 }
1.5、hgetall:获取该key下所有的值。格式是:hgetall hash的key
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.Map;
4
5 /**
6 * redis中对于hash类型的: hgetall 操作示例
7 * hgetall:获取该key下所有的值。格式是:hgetall hash的key
8 */
9 public class Hash_hgetall_operation {
10 public static void main(String[] args) {
11 Jedis jedis = new Jedis("127.0.0.1",6379);
12 /**
13 * 示例1: hgetall hash的key
14 */
15 Map<String, String> myhash = jedis.hgetAll("myhash");
16 System.out.println("myhash = " + myhash);
17 }
18 }
1.6、hdel:删除某个项。格式是:hdel hash的key 项的key
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.Map;
4
5 /**
6 * redis中对于hash类型的: hdel 操作示例
7 * hdel:删除某个项。格式是:hdel hash的key 项的key
8 */
9 public class Hash_hdel_operation {
10 public static void main(String[] args) {
11 Jedis jedis = new Jedis("127.0.0.1",6379);
12
13 Map<String, String> myhash = jedis.hgetAll("myhash");
14 System.out.println("myhash = " + myhash);
15 /**
16 * 示例1: hdel hash的key 项的key
17 */
18 Long hdel = jedis.hdel("myhash", "age");
19 System.out.println("hdel = " + hdel);
20
21 Map<String, String> myhash1 = jedis.hgetAll("myhash");
22 System.out.println("myhash1 = " + myhash1);
23 }
24 }
1.7、hlen:获取key里面的键值对数量。格式是:hlen hash的key
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.Map;
4
5 /**
6 * redis中对于hash类型的: hlen 操作示例
7 * hlen:获取key里面的键值对数量。格式是:hlen hash的key
8 */
9 public class Hash_hlen_operation {
10
11 public static void main(String[] args) {
12 Jedis jedis = new Jedis("127.0.0.1",6379);
13
14 Map<String, String> myhash = jedis.hgetAll("myhash");
15 System.out.println("myhash = " + myhash);
16 /**
17 * 示例1: hlen hash的key
18 */
19 Long hlen = jedis.hlen("myhash");
20 System.out.println("hlen = " + hlen);
21 }
22 }
1.8、hexists:判断键值是否存在。格式是:hexists hash的key 项的key
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.Map;
4
5 /**
6 * redis中对于hash类型的: hexists 操作示例
7 * hexists:判断键值是否存在。格式是:hexists hash的key 项的key
8 */
9 public class Hash_hexists_operation {
10 public static void main(String[] args) {
11 Jedis jedis = new Jedis("127.0.0.1",6379);
12
13 Map<String, String> myhash = jedis.hgetAll("myhash");
14 System.out.println("myhash = " + myhash);
15 /**
16 * 示例1: hexists hash的key 项的key
17 */
18 Boolean hexists = jedis.hexists("myhash", "id");
19 System.out.println("hexists = " + hexists);
20 }
21 }
1.9、hkeys:获取所有的item的key,格式是:hkeys hash的key
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.Map;
4 import java.util.Set;
5
6 /**
7 * redis中对于hash类型的: hexists 操作示例
8 * hkeys:获取所有的item的key,格式是:hkeys hash的key
9 */
10 public class Hash_hkeys_operation {
11 public static void main(String[] args) {
12 Jedis jedis = new Jedis("127.0.0.1",6379);
13
14 Map<String, String> myhash = jedis.hgetAll("myhash");
15 System.out.println("myhash = " + myhash);
16 /**
17 * 示例1: hkeys hash的key
18 */
19 Set<String> hkeys = jedis.hkeys("myhash");
20 System.out.println("hkeys = " + hkeys);
21 }
22 }
1.10、hvals:获取所有的item的值,格式是:hvals hash的key
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.List;
4 import java.util.Map;
5
6 /**
7 * redis中对于hash类型的: hexists 操作示例
8 * hvals:获取所有的item的值,格式是:hvals hash的key
9 */
10 public class Hash_hvals_operation {
11 public static void main(String[] args) {
12 Jedis jedis = new Jedis("127.0.0.1",6379);
13
14 Map<String, String> myhash = jedis.hgetAll("myhash");
15 System.out.println("myhash = " + myhash);
16 /**
17 * 示例1: hvals hash的key
18 */
19 List<String> hvals = jedis.hvals("myhash");
20 System.out.println("hvals = " + hvals);
21 }
22 }
1.11、hincrby : 增减整数数字,格式是:hincrby Hash的key 项的key 正负整数
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.Map;
4
5 /**
6 * redis中对于hash类型的: hexists 操作示例
7 * hincrby : 增减整数数字,格式是:hincrby Hash的key 项的key 正负整数
8 */
9 public class Hash_hincrby_operation {
10 public static void main(String[] args) {
11 Jedis jedis = new Jedis("127.0.0.1",6379);
12
13 Map<String, String> myhash = jedis.hgetAll("myhash");
14 System.out.println("myhash = " + myhash);
15 /**
16 * 示例1: hincrby Hash的key 项的key 正负整数
17 */
18 Long hincrBy = jedis.hincrBy("myhash", "id", 4);
19 System.out.println("hincrBy = " + hincrBy);
20
21 Map<String, String> myhash2 = jedis.hgetAll("myhash");
22 System.out.println("myhash2 = " + myhash2);
23 }
24 }
1.12、hincrbyfloat :增减float数值,格式是:hincrbyfloat Hash的key 项的key 正负float
操作如下:
1.13、hsetnx : 如果项不存在则赋值,存在时什么都不做,格式是:hsetnx Hash的key 项的key 项的值
操作如下:
java示例代码:
1 import redis.clients.jedis.Jedis;
2
3 import java.util.Map;
4
5 /**
6 * redis中对于hash类型的: hexists 操作示例
7 * hsetnx : 如果项不存在则赋值,存在时什么都不做,格式是:hsetnx Hash的key 项的key 项的值
8 */
9 public class Hash_hsetnx_operation {
10
11 public static void main(String[] args) {
12 Jedis jedis = new Jedis("127.0.0.1",6379);
13
14 Map<String, String> myhash = jedis.hgetAll("myhash");
15 System.out.println("myhash = " + myhash);
16 /**
17 * 示例1: hsetnx Hash的key 项的key 项的值
18 */
19 jedis.hsetnx("myhash","id","123");
20 jedis.hsetnx("myhash","address","chengdou");
21
22 Map<String, String> myhash2 = jedis.hgetAll("myhash");
23 System.out.println("myhash2 = " + myhash2);
24 }
25 }