ObjectRedisHash

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

used to operateRedisHash object, creation method:

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

inheritance relationship

member function

set

Set the value of the field field in the hash table to value. If the field field already exists in the hash table, the old value will be overwritten.

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RedisHash.set(Buffer field,
    Buffer value);

Call parameters:

• field:Buffer, specify the field to be modified
• value:Buffer, specify the data to be modified

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setNX

Set the value of the field field in the hash table to value if and only if the field field does not exist. If the domain field already exists, this operation is invalid

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RedisHash.setNX(Buffer field,
    Buffer value);

Call parameters:

• field:Buffer, specify the field to be modified
• value:Buffer, specify the data to be modified

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mset

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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RedisHash.mset(Object kvs);

Call parameters:

• kvs: Object, specifies the field/value object to be set

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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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RedisHash.mset(...kvs);

Call parameters:

• kvs: ..., specify the field/value list to be set

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get

Returns the value of the given field in the hash table

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Buffer RedisHash.get(Buffer field);

Call parameters:

• field:Buffer, specify the field to be queried

Return results:

• Buffer, the value of a given field, when the given field does not exist or the given key does not exist, returns null

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mget

Returns the value of one or more given fields in a hash table

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NArray RedisHash.mget(Array fields);

Call parameters:

• fields: Array, specifies the domain array to be queried

Return results:

• NArray, a list containing all values ​​of a given domain

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Returns the value of one or more given fields in a hash table

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NArray RedisHash.mget(...fields);

Call parameters:

• fields: ..., specify the domain list to be queried

Return results:

• NArray, a list containing all values ​​of a given domain

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incr

Increment the value stored in the field

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Long RedisHash.incr(Buffer field,
    Long num = 1);

Call parameters:

• field:Buffer, specify the domain to be modified
• num: Long, specifies the value to be added

Return results:

• Long, after adding num, the value of the domain

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getAll

Returns all fields and values ​​in the hash table

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NArray RedisHash.getAll();

Return results:

• NArray, returns a list containing all fields in the hash table

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keys

Returns all fields in the hash table

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NArray RedisHash.keys();

Return results:

• NArray, in the return value, immediately following each domain name (field name) is the value of the field (value), so the length of the return value is twice the size of the hash table

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len

Returns the number of fields in the hash table

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Integer RedisHash.len();

Return results:

• Integer, returns the number of fields in the hash table

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exists

Check whether the given domain field exists in the hash table

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Boolean RedisHash.exists(Buffer field);

Call parameters:

• field:Buffer, specify the field to be queried

Return results:

• Boolean, if the hash table contains the given field, return true, if the hash table does not contain the given field, or the key does not exist, return false

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del

Delete one or more specified fields in the hash table. Non-existing fields will be ignored.

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Integer RedisHash.del(Array fields);

Call parameters:

• fields: Array, specifies the domain array to be deleted

Return results:

• Integer, the number of deleted domains

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Delete one or more specified fields in the hash table. Non-existing fields will be ignored.

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Integer RedisHash.del(...fields);

Call parameters:

• fields: ..., specifies the list of domains to delete

Return results:

• Integer, the number of deleted domains

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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 RedisHash.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 RedisHash.toJSON(String key = "");

Call parameters:

• key: String, not used

Return results:

• Value, returns a value containing JSON serializable