ObjectRedisSet

RedisDatabase client Set object. This object is the client containing the specified key. Only by calling its method will the database be operated.

used to operateRedisSet object, creation method:

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var db = require("db");
var rdb = new db.openRedis("redis-server");
var set = rdb.getSet("test");

inheritance relationship

member function

add

Add one or more member elements to the collection key. Member elements that already exist in the collection will be ignored.

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Integer RedisSet.add(Array members);

Call parameters:

• members: Array, specifies the array of elements to be added

Return results:

• Integer, the number of new elements added to the set, excluding ignored elements

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Set multiple field-value (domain-value) pairs into the hash table at the same time. This command will overwrite the fields that already exist in the hash table.

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Integer RedisSet.add(...members);

Call parameters:

• members: ..., specifies the list of elements to be added

Return results:

• Integer, the number of new elements added to the set, excluding ignored elements

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remove

Remove one or more member elements from the collection

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Integer RedisSet.remove(Array members);

Call parameters:

• members: Array, specifies the array of elements to be removed

Return results:

• Integer, the number of successfully removed elements, excluding ignored elements

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Remove one or more member elements from the collection

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Integer RedisSet.remove(...members);

Call parameters:

• members: ..., specifies the list of elements to be removed

Return results:

• Integer, the number of successfully removed elements, excluding ignored elements

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len

Returns the number of elements in the collection

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Integer RedisSet.len();

Return results:

• Integer, returns the length of the collection

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exists

Determine whether the member element is a member of the collection

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Boolean RedisSet.exists(Buffer member);

Call parameters:

• member:Buffer, specify the member to check

Return results:

• Boolean, returns true if the member element is a member of the collection

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members

Returns all members of the collection

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NArray RedisSet.members();

Return results:

• NArray, a list of all members in the set

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pop

Removes and returns a random element from the collection

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Buffer RedisSet.pop();

Return results:

• Buffer, the random element that was removed. When the set is empty, returns null

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randMember

Get a random element from the collection

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Value RedisSet.randMember();

Return results:

• Value, returns an element; if the collection is empty, returns null

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Get random elements from a collection

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Value RedisSet.randMember(Integer count);

Call parameters:

• count: Integer, specifies the number of elements to be returned. Positive number, returns an array containing count elements; negative number, returns an array, the elements in the array may be repeated multiple times, and the length of the array is the absolute value of count

Return results:

• Value, returns a list; if the collection is empty, returns an empty list

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toString

Returns the string representation of the object. Generally, "[Native Object]" is returned. The object can be re-implemented according to its own characteristics.

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String RedisSet.toString();

Return results:

• String, returns the string representation of the object

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toJSON

Returns a JSON format representation of the object, generally returning a collection of readable properties defined by the object.

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Value RedisSet.toJSON(String key = "");

Call parameters:

• key: String, not used

Return results:

• Value, returns a value containing JSON serializable