Redis实战 - 03 RedisTemplate 的 hash 结构

news/2024/5/6 6:18:24/文章来源:https://blog.csdn.net/qq_42764468/article/details/127161125

文章目录

- - - 1. put(H var1, HK var2, HV var3)
    - 2. get(H var1, Object var2)
    - 3. entries(H key)
    - 4. keys(H key)
    - 5. values(H key)
    - 6. hasKey(H key, Object var2)
    - 7. size(H key)
    - 8. putAll(H key, Map<? extends HK, ? extends HV> map)

1. put(H var1, HK var2, HV var3)

新增 hashMap 值：

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@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash(){/*** - var1 为Redis的key* - var2 为key对应的map值的key* - var3 为key对应的map值的值* - var2相同替换var3*/redisTemplate.opsForHash().put("hashValue","map1","value1");redisTemplate.opsForHash().put("hashValue","map2","value2");redisTemplate.opsForHash().put("hashValue","map3","value3");}
}

2. get(H var1, Object var2)

返回哈希表 key 中给定域 field 的值：

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@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash(){Object object1 = redisTemplate.opsForHash().get("hashValue", "map1");Object object2 = redisTemplate.opsForHash().get("hashValue", "map2");Object object3 = redisTemplate.opsForHash().get("hashValue", "map3");//object1 = value1System.out.println("object1 = " + object1); //object2 = value2System.out.println("object2 = " + object2); //object3 = value3System.out.println("object3 = " + object3); }
}

3. entries(H key)

返回哈希表 key 中，所有的 field 和值：

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@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash(){Map map = redisTemplate.opsForHash().entries("hashValue");// map = {map1=value1, map2=value2, map3=value3}System.out.println("map = " + map); }
}

4. keys(H key)

返回哈希表 key 中的所有域：

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@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash(){Set fields = redisTemplate.opsForHash().keys("hashValue"); // [map1, map2, map3]System.out.println(fields);}
}

5. values(H key)

返回哈希表 key 中所有域的值：

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@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash(){List values = redisTemplate.opsForHash().values("hashValue");// values = [value1, value2, value3]System.out.println("values = " + values);}
}

6. hasKey(H key, Object var2)

查看哈希表 key 中，给定域 field 是否存在：

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@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash2(){Boolean aBoolean = redisTemplate.opsForHash().hasKey("hashValue", "map1");}
}

7. size(H key)

返回哈希表 key 中域的数量：

@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash2(){Long size = redisTemplate.opsForHash().size("hashValue");}
}

8. putAll(H key, Map<? extends HK, ? extends HV> map)

同时将多个 field-value (域-值)对设置到哈希表 key 中，此命令会覆盖哈希表中已存在的域：

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@SpringBootTest
@RunWith(SpringRunner.class)
public class SeckillApplicationTest {@Autowiredprivate RedisTemplate redisTemplate;@Testpublic void testHash2(){Map<String,String> map = new HashMap();map.put("map4","value4");map.put("map5","value5");map.put("map6","value6");redisTemplate.opsForHash().putAll("hashValue",map);}
}