寫在前面的話:讀書破萬卷,編碼如有神
--------------------------------------------------------------------
--------------------------------------------------------------------
1、對Hash類型的操作命令
1.1、hset:設置值。格式是:hset hash的key 項的key 項的值
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; /** * redis中對於hash類型的: hset 操作示例 * hset:設置值。格式是:hset hash的key 項的key 項的值 */ public class Hash_hset_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); /** * 示例1: hset hash的key 項的key 項的值 */ jedis.hset("myhash","id","3"); jedis.hset("myhash","name","xiaohong"); jedis.hset("myhash","age","13"); } }
1.2、hmset:同時設置多對值。格式是:hmset hash的key 項的key 項的值。(項的key和項的值可以多對)
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.HashMap; import java.util.Map; /** * redis中對於hash類型的: hmset 操作示例 * hmset:同時設置多對值。格式是:hmset hash的key 項的key 項的值。(項的key和項的值可以多對) */ public class Hash_hmset_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); /** * 示例1: hmset hash的key 項的key 項的值。(項的key和項的值可以多對) */ Map<String,String> map = new HashMap<>(); map.put("id","1"); map.put("name","dongdong"); map.put("age","3"); jedis.hmset("myhash",map); } }
1.3、hget:獲取值。格式是:hget hash的key 項的key
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; /** * redis中對於hash類型的: hget 操作示例 * hget:獲取值。格式是:hget hash的key 項的key */ public class Hash_hget_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); /** * 示例1: hget hash的key 項的key */ String id = jedis.hget("myhash", "id"); String name = jedis.hget("myhash", "name"); String age = jedis.hget("myhash", "age"); System.out.println(String.format("id = %s, name = %s, age = %s",id,name,age)); } }
1.4、hmget:同時獲取多對值。格式是:hmget hash的key 項的key。(項的key可以有多個)
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.List; /** * redis中對於hash類型的: hmget 操作示例 * hmget:同時獲取多對值。格式是:hmget hash的key 項的key。(項的key可以有多個) */ public class Hash_hmget_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); /** * 示例1: hmget hash的key 項的key。(項的key可以有多個) */ List<String> hmget = jedis.hmget("myhash", "id", "name", "age"); System.out.println("hmget = " + hmget); } }
1.5、hgetall:獲取該key下所有的值。格式是:hgetall hash的key
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.Map; /** * redis中對於hash類型的: hgetall 操作示例 * hgetall:獲取該key下所有的值。格式是:hgetall hash的key */ public class Hash_hgetall_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); /** * 示例1: hgetall hash的key */ Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); } }
1.6、hdel:刪除某個項。格式是:hdel hash的key 項的key
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.Map; /** * redis中對於hash類型的: hdel 操作示例 * hdel:刪除某個項。格式是:hdel hash的key 項的key */ public class Hash_hdel_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); /** * 示例1: hdel hash的key 項的key */ Long hdel = jedis.hdel("myhash", "age"); System.out.println("hdel = " + hdel); Map<String, String> myhash1 = jedis.hgetAll("myhash"); System.out.println("myhash1 = " + myhash1); } }
1.7、hlen:獲取key裏面的鍵值對數量。格式是:hlen hash的key
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.Map; /** * redis中對於hash類型的: hlen 操作示例 * hlen:獲取key裏面的鍵值對數量。格式是:hlen hash的key */ public class Hash_hlen_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); /** * 示例1: hlen hash的key */ Long hlen = jedis.hlen("myhash"); System.out.println("hlen = " + hlen); } }
1.8、hexists:判斷鍵值是否存在。格式是:hexists hash的key 項的key
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.Map; /** * redis中對於hash類型的: hexists 操作示例 * hexists:判斷鍵值是否存在。格式是:hexists hash的key 項的key */ public class Hash_hexists_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); /** * 示例1: hexists hash的key 項的key */ Boolean hexists = jedis.hexists("myhash", "id"); System.out.println("hexists = " + hexists); } }
1.9、hkeys:獲取所有的item的key,格式是:hkeys hash的key
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.Map; import java.util.Set; /** * redis中對於hash類型的: hexists 操作示例 * hkeys:獲取所有的item的key,格式是:hkeys hash的key */ public class Hash_hkeys_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); /** * 示例1: hkeys hash的key */ Set<String> hkeys = jedis.hkeys("myhash"); System.out.println("hkeys = " + hkeys); } }
1.10、hvals:獲取所有的item的值,格式是:hvals hash的key
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.List; import java.util.Map; /** * redis中對於hash類型的: hexists 操作示例 * hvals:獲取所有的item的值,格式是:hvals hash的key */ public class Hash_hvals_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); /** * 示例1: hvals hash的key */ List<String> hvals = jedis.hvals("myhash"); System.out.println("hvals = " + hvals); } }
1.11、hincrby : 增減整數數字,格式是:hincrby Hash的key 項的key 正負整數
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.Map; /** * redis中對於hash類型的: hexists 操作示例 * hincrby : 增減整數數字,格式是:hincrby Hash的key 項的key 正負整數 */ public class Hash_hincrby_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); /** * 示例1: hincrby Hash的key 項的key 正負整數 */ Long hincrBy = jedis.hincrBy("myhash", "id", 4); System.out.println("hincrBy = " + hincrBy); Map<String, String> myhash2 = jedis.hgetAll("myhash"); System.out.println("myhash2 = " + myhash2); } }
1.12、hincrbyfloat :增減float數值,格式是:hincrbyfloat Hash的key 項的key 正負float
操作如下:
1.13、hsetnx : 如果項不存在則賦值,存在時什麼都不做,格式是:hsetnx Hash的key 項的key 項的值
操作如下:
java示例代碼:
import redis.clients.jedis.Jedis; import java.util.Map; /** * redis中對於hash類型的: hexists 操作示例 * hsetnx : 如果項不存在則賦值,存在時什麼都不做,格式是:hsetnx Hash的key 項的key 項的值 */ public class Hash_hsetnx_operation { public static void main(String[] args) { Jedis jedis = new Jedis("127.0.0.1",6379); Map<String, String> myhash = jedis.hgetAll("myhash"); System.out.println("myhash = " + myhash); /** * 示例1: hsetnx Hash的key 項的key 項的值 */ jedis.hsetnx("myhash","id","123"); jedis.hsetnx("myhash","address","chengdou"); Map<String, String> myhash2 = jedis.hgetAll("myhash"); System.out.println("myhash2 = " + myhash2); } }