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                Redis HSETNX命令用于在存儲的關鍵值的散列設置字段,只有在字段不存在。如果鍵不存在,新的key會被哈希創建。如果字段已經存在,該操作沒有任何影響。 ## 返回值 返回整型 * 1 如果字段是哈希值和一個新字段被設置。 * 0 如果字段已經存在于哈希那么沒有執行任何操作。 ## 語法 Redis HSETNX命令的基本語法如下所示: ~~~ redis 127.0.0.1:6379> HSETNX KEY_NAME FIELD VALUE ~~~ ### 例子 ~~~ redis 127.0.0.1:6379> HSETNX myhash field1 "foo" (integer) 1 redis 127.0.0.1:6379> HSETNX myhash field1 "bar" (integer) 0 redis 127.0.0.1:6379> HGET myhash field1 "foo" ~~~
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