redis使用之setnx

Examples

shell:

redis> SETNX mykey "Hello"

(integer) 1

redis> SETNX mykey "World"

(integer) 0

redis> GET mykey

"Hello"

redis> 

 

springData:

String userName = "userName1";
BoundValueOperations operations = redisTemplate.boundValueOps(userName);
try {
    // 執行setnx命令的結果，這里封裝的方法是直接返回true和false
    boolean addFlag = operations.setIfAbsent(2);
    System.out.println(addFlag);
}finally {
    //操作完成刪除key
    operations.getOperations().delete(userName);
}