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338 lines
13 KiB
C++
338 lines
13 KiB
C++
#pragma once
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#include "acl_cpp/acl_cpp_define.hpp"
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#include <map>
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#include <vector>
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#include "acl_cpp/stdlib/string.hpp"
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#include "acl_cpp/redis/redis_command.hpp"
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namespace acl
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{
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class redis_client;
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class redis_result;
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/**
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* redis Hash(哈希表) 类，本类的实现的主要命令：
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* redis Hash class, include commands as below:
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* HDEL/HEXISTS/HGET/HGETALL/HINCRBY/HINCRBYFLOAT/HKEYS/HLEN/HMGET/HMSET
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* HSET/HSETNX/HVALS/HSCAN
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*/
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class ACL_CPP_API redis_hash : virtual public redis_command
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{
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public:
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/**
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* see redis_command::redis_command()
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*/
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redis_hash();
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/**
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* see redis_command::redis_command(redis_client*)
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*/
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redis_hash(redis_client* conn);
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/**
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* see redis_command::redis_command(redis_client_cluster*， size_t)
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*/
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redis_hash(redis_client_cluster* cluster, size_t max_conns);
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virtual ~redis_hash();
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/////////////////////////////////////////////////////////////////////
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/**
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* 将多个"域-值"对添加至 KEY 对应的哈希表中
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* HMSET: set the key's multiple fileds in redis-server
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* @param key {const char*} 哈希表 key 值
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* the hash key for Hash class
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* @param attrs {const std::map<acl::string, ...>&} the fileds in map
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* @return {bool} 添加是否成功
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* if successful for HMSET command
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*/
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bool hmset(const char* key, const std::map<string, string>& attrs);
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bool hmset(const char* key, const std::map<string, const char*>& attrs);
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/////////////////////////////////////////////////////////////////////
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/**
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* 根据 KEY 值将多个"域-值"对从哈希表中取出
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* get the values associated with the specified fields
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* in the hash stored at key
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* @param key {const char*} 哈希表 key 值
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* the hash key
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* @param names 对应 key 的域值对
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* the given hash fileds
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* @param result {std::vector<acl::string>*} 当该对象指针非空时存储查询结果；
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* 如果该参数为 NULL 时，则可以通过基类 result_/get_ 获得数据
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* store the result of the given hash files if not NULL.
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* If NULL, the base class's method like result_/get can be used
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* to get the values
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* @return {bool} 操作是否成功，操作成功后可以通过以下任一种方式获得数据：
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* if successul, one of below ways can be used to get the result:
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*
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* 1、在调用方法中传入非空的存储结果对象的地址
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* input the no-NULL result parameter when call hmget, when
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* success, the result will store the values of the given fileds
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*
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* 2、基类方法 result_value 获得指定下标的元素数据
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* call redis_command::result_value with the specified subscript
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*
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* 3、基类方法 result_child 获得指定下标的元素对象(redis_result），然后再通过
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* redis_result::argv_to_string 方法获得元素数据
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* call redis_command::result_child with specified subscript to
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* get redis_result object, then call redis_result::argv_to_string
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* with above result to get the values of the give fileds
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*
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* 4、基类方法 get_result 方法取得总结果集对象 redis_result，然后再通过
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* redis_result::get_child 获得一个元素对象，然后再通过方式 2 中指定
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* 的方法获得该元素的数据
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* call redis_command::get_result with the specified subscript to
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* get redis_result object, and use redis_result::get_child to
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* get one result object, then call redis_result::argv_to_string
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* to get the value of one filed.
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*
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* 5、基类方法 get_children 获得结果元素数组对象，再通过 redis_result 中
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* 的方法 argv_to_string 从每一个元素对象中获得元素数据
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* use redis_command::get_children to get the redis_result array,
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* then use redis_result::argv_to_string to get every value of
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* the given fileds
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*/
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bool hmget(const char* key, const std::vector<string>& names,
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std::vector<string>* result = NULL);
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bool hmget(const char* key, const std::vector<const char*>& names,
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std::vector<string>* result = NULL);
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bool hmget(const char* key, const char* names[], size_t argc,
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std::vector<string>* result = NULL);
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bool hmget(const char* key, const char* names[], const size_t lens[],
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size_t argc, std::vector<string>* result = NULL);
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/////////////////////////////////////////////////////////////////////
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/**
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* 设置 key 对象中某个域字段的值
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* set one field's value in the hash stored at key.
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* @param key {const char*} key 键值
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* the hash key
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* @param name {const char*} key 对象的域名称
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* the filed name of the hash key
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* @param value {const char*} key 对象的域值
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* the filed value of the hash key
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* @return {int} 返回值含义：
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* 1 -- 表示新添加的域字段添加成功
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* 0 -- 表示更新已经存在的域字段成功
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* -1 -- 表示出错或该 key 对象非哈希对象或从结点禁止修改
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* return int value as below:
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* 1 -- this is a new filed and set ok
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* 0 -- thie is a old filed and set ok
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* -1 -- error happend or the key is not a Hash type
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*/
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int hset(const char* key, const char* name, const char* value);
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int hset(const char* key, const char* name,
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const char* value, size_t value_len);
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int hset(const char* key, const char* name, size_t name_len,
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const char* value, size_t value_len);
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/**
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* 当且仅当 key 对象中的某个域字段不存在时才更新该域字段值
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* set one new field of one key in hash only when the filed isn't
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* existing.
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* @param key {const char*} key 键值
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* the hash key
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* @param name {const char*} key 对象的域名称
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* the field name
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* @param value {const char*} key 对象的域值
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* the field value
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* @return {int} 返回值含义：
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* 1 -- 表示新添加的域字段添加成功
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* 0 -- 该域字段存在且未对其进行更新
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* -1 -- 表示出错或该 key 对象非哈希对象或从结点禁止修改
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*
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* return int value as below:
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* 1 -- this is a new filed and set ok
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* 0 -- thie is a old filed and not set
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* -1 -- error happend or the key is not a Hash type
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*/
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int hsetnx(const char* key, const char* name, const char* value);
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int hsetnx(const char* key, const char* name,
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const char* value, size_t value_len);
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int hsetnx(const char* key, const char* name, size_t name_len,
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const char* value, size_t value_len);
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/**
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* 从 redis 哈希表中获取某个 key 对象的某个域的值
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* get the value assosiated with field in the hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @param name {const char*} key 对象的域字段名称
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* the field's name
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* @param result {acl::string&} 存储查询结果值(内部对该 string 进行内容追加)
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* store the value result of the given field
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* @return {bool} 返回值含义：
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* true -- 成功获得对象的域字段值
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* get the value associated with field
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* false -- 域字段不存在或操作失败或该 key 对象非哈希对象
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* the field not exists, or error happened,
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* or the key isn't a hash key
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*/
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bool hget(const char* key, const char* name, string& result);
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bool hget(const char* key, const char* name,
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size_t name_len, string& result);
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/**
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* 从 redis 哈希表中获取某个 key 对象的所有域字段的值
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* get all the fields and values in hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @param result {std::map<string, string>&} 存储域字段名-值查询结果集
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* store the result of all the fileds and values
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* @return {bool} 操作是否成功，含义：
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* if ok, show below:
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* true -- 操作成功，当该域不存在时也返回成功，需要检查 result 内容是否变化，
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* 比如可以通过检查 result.size() 的变化来表明是否查询到结果
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* successful if the key is a hash key or the key not exists
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* false -- 操作失败或该 key 对象非哈希对象
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* error happened or the key isn't a hash key
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*/
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bool hgetall(const char* key, std::map<string, string>& result);
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bool hgetall(const char* key, std::vector<string>& names,
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std::vector<string>& values);
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bool hgetall(const char* key, std::vector<const char*>& names,
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std::vector<const char*>& values);
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/**
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* 从 redis 哈希表中删除某个 key 对象的某些域字段
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* remove one or more fields from hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @param first_name {const char*} 第一个域字段名，最后一个字段必须是 NULL
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* the first field of the fields list, the last field must be NULL
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* indicating the end of vary parameters
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* @return {int} 成功删除的域字段个数，返回 -1 表示出错或该 key 对象非哈希对象
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* return the number of fields be removed successfully, or -1 when
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* error happened or operating on a no hash key
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*/
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int hdel(const char* key, const char* first_name);
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int hdel(const char* key, const char* names[], size_t argc);
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int hdel(const char* key, const char* names[],
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const size_t names_len[], size_t argc);
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int hdel(const char* key, const std::vector<string>& names);
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int hdel(const char* key, const std::vector<const char*>& names);
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int hdel_fields(const char* key, const char* names[], size_t argc);
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int hdel_fields(const char* key, const char* names[],
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const size_t names_len[], size_t argc);
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int hdel_fields(const char* key, const std::vector<string>& names);
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int hdel_fields(const char* key, const std::vector<const char*>& names);
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int hdel_fields(const char* key, const char* first_name, ...);
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/**
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* 当某个 key 对象中的某个域字段为整数时，对其进行加减操作
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* inc(+n) or dec(-n) on a integer filed in hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @param name {const char*} key 对象的域字段名称
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* the filed name of integer type
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* @param inc {long long int} 增加的值，可以为负值
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* the integer value to be inc or dec on the field's value
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* @param result {long long int*} 非 NULL 时存储结果值
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* store the result if non-NULL
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* @return {bool} 操作是否成功，当返回 false 时表明出错或该 key 对象非哈希
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* 对象或该域字段非整数类型
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* if successful: false when error, not a hash, or the field isn't
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* integer type
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*/
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bool hincrby(const char* key, const char* name,
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long long int inc, long long int* result = NULL);
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/**
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* 当某个 key 对象中的某个域字段为浮点数时，对其进行加减操作
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* inc(+n) or dec(-n) on a float filed in hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @param name {const char*} key 对象的域字段名称
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* the filed name of float type
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* @param inc {double} 增加的值，可以为负值
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* the float value to be inc or dec on the field's value
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* @param result {double*} 非 NULL 时存储结果值
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* store the result if non-NULL
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* @return {bool} 操作是否成功，当返回 false 时表明出错或该 key 对象非哈希
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* 对象或该域字段非浮点数类型
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* if successful: false when error, not a hash, or the field isn't
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* float type
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*/
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bool hincrbyfloat(const char* key, const char* name,
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double inc, double* result = NULL);
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/**
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* 返回 key 对象中所有域字段名称
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* get all the fields in hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @param names {std::vector<string>&} 存储该 key 对象所有域字段名称
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* store all the names of all fileds
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* @return {bool} 操作是否成功，返回 false 表明出错或该 key 对象非哈希对象
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* return true on success, false if error happened or the
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* key wasn't a hash key
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*/
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bool hkeys(const char* key, std::vector<string>& names);
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/**
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* 检查 key 对象中某个域字段是否存在
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* check if the field exists in hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @param name {const char*} key 对象的域字段名称
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* the filed's name of the key
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* @return {bool} 操作是否成功，返回 false 表明出错或该 key 对象非哈希对象
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* 或该域字段不存在
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* return true on success, false if error happened or the
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* key wasn't a hash key
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*/
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bool hexists(const char* key, const char* name);
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bool hexists(const char* key, const char* name, size_t name_len);
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/**
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* 获得某个 key 对象中所有域字段的数量
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* get the count of fields in hash stored at key
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* @param key {const char*} key 键值
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* the hash key
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* @return {int} 返回值含义：
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* return int value as below:
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* -1 -- 出错或该 key 对象非哈希对象
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* error or not a hash key
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* >0 -- 域字段数量
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* the count of fields
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* 0 -- 该 key 不存在或域字段数量为 0
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* key not exists or no fields in hash stored at key
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*/
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int hlen(const char* key);
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/**
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* 命令用于迭代哈希键中的键值对
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* scan the name and value of all fields in hash stored at key
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* @param key {const char*} 哈希键值
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* the hash key
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* @param cursor {int} 游标值，开始遍历时该值写 0
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* the cursor value, which is 0 at begin
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* @param out {std::map<acl::string>&} 存储结果集，内部以追加方式将本次
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* 遍历结果添加进该对象中，为防止因总结果集过大导致该数组溢出，用户可在
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* 调用本函数前后清理该对象
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* store scaning result in appending mode
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* @param pattern {const char*} 匹配模式，glob 风格，非空时有效
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* match pattern, effective only on no-NULL
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* @param count {const size_t*} 限定的结果集数量，非空指针时有效
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* the max count of one scan process, effective only on no-NULL
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* @return {int} 下一个游标位置，含义如下：
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* return the next cursor position, as below:
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* 0：遍历结束
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* scan finish
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* -1: 出错
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* some error happened
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* >0: 游标的下一个位置，即使这样，具体有多少结果还需要检查 out，因为有可能为空
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* the next cursor postion to scan
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*/
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int hscan(const char* key, int cursor, std::map<string, string>& out,
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const char* pattern = NULL, const size_t* count = NULL);
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};
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} // namespace acl
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