// 结构体列表typedef struct leveldb_t leveldb_t; // 数据库typedef struct leveldb_cache_t leveldb_cache_t; // 缓存typedef struct leveldb_comparator_t leveldb_comparator_t; // 比较器typedef struct leveldb_env_t leveldb_env_t; // 环境typedef struct leveldb_filelock_t leveldb_filelock_t; // 文件锁typedef struct leveldb_filterpolicy_t leveldb_filterpolicy_t; // 过滤器typedef struct leveldb_iterator_t leveldb_iterator_t; // 迭代器typedef struct leveldb_logger_t leveldb_logger_t; // 日志typedef struct leveldb_options_t leveldb_options_t; // 选项typedef struct leveldb_randomfile_t leveldb_randomfile_t; //typedef struct leveldb_readoptions_t leveldb_readoptions_t; // 读选项typedef struct leveldb_seqfile_t leveldb_seqfile_t; //typedef struct leveldb_snapshot_t leveldb_snapshot_t; // 快照typedef struct leveldb_writablefile_t leveldb_writablefile_t; //typedef struct leveldb_writebatch_t leveldb_writebatch_t; // 批写入typedef struct leveldb_writeoptions_t leveldb_writeoptions_t; // 写选项// 函数列表/************************************************************ 数据库API *********************************************************************/// 打开数据库extern leveldb_t* leveldb_open( const leveldb_options_t* options,const char* name,char** errptr);// 关闭数据库extern void leveldb_close(leveldb_t* db);// 添加k-vextern void leveldb_put(leveldb_t* db,const leveldb_writeoptions_t* options, const char* key, size_t keylen,const char* val, size_t vallen,char** errptr);// 删除k-vextern void leveldb_delete(leveldb_t* db,const leveldb_writeoptions_t* options,const char* key, size_t keylen,char** errptr);// 原子性写入extern void leveldb_write(leveldb_t* db,const leveldb_writeoptions_t* options,leveldb_writebatch_t* batch,char** errptr);// 获取k-vextern char* leveldb_get(leveldb_t* db,const leveldb_readoptions_t* options,const char* key, size_t keylen,size_t* vallen,char** errptr);// 获取属性值extern char* leveldb_property_value(leveldb_t* db,const char* propname);// 获取数据库大概的大小extern void leveldb_approximate_sizes(leveldb_t* db,int num_ranges,const char* const* range_start_key, const size_t* range_start_key_len,const char* const* range_limit_key, const size_t* range_limit_key_len,uint64_t* sizes);// 范围压缩extern void leveldb_compact_range(leveldb_t* db,const char* start_key, size_t start_key_len,const char* limit_key, size_t limit_key_len);// 销毁数据库extern void leveldb_destroy_db(const leveldb_options_t* options,const char* name,char** errptr);// 修复数据库extern void leveldb_repair_db(const leveldb_options_t* options,const char* name,char** errptr);//extern void leveldb_free(void* ptr);/************************************************************ 迭代器API *********************************************************************/// 创建迭代器extern leveldb_iterator_t* leveldb_create_iterator(leveldb_t* db,const leveldb_readoptions_t* options);extern void leveldb_iter_destroy(leveldb_iterator_t*);extern unsigned char leveldb_iter_valid(const leveldb_iterator_t*);extern void leveldb_iter_seek_to_first(leveldb_iterator_t*);extern void leveldb_iter_seek_to_last(leveldb_iterator_t*);extern void leveldb_iter_seek(leveldb_iterator_t*, const char* k, size_t klen);extern void leveldb_iter_next(leveldb_iterator_t*);extern void leveldb_iter_prev(leveldb_iterator_t*);extern const char* leveldb_iter_key(const leveldb_iterator_t*, size_t* klen);extern const char* leveldb_iter_value(const leveldb_iterator_t*, size_t* vlen);extern void leveldb_iter_get_error(const leveldb_iterator_t*, char** errptr);/************************************************************ 批量写入API *******************************************************************///extern leveldb_writebatch_t* leveldb_writebatch_create();extern void leveldb_writebatch_destroy(leveldb_writebatch_t*);extern void leveldb_writebatch_clear(leveldb_writebatch_t*);extern void leveldb_writebatch_put(leveldb_writebatch_t*,const char* key, size_t klen,const char* val, size_t vlen);extern void leveldb_writebatch_delete(leveldb_writebatch_t*,const char* key, size_t klen);extern void leveldb_writebatch_iterate(leveldb_writebatch_t*,void* state,void (*put)(void*, const char* k, size_t klen, const char* v, size_t vlen),void (*deleted)(void*, const char* k, size_t klen));/************************************************************** 选项器API *********************************************************************///extern leveldb_options_t* leveldb_options_create();extern void leveldb_options_destroy(leveldb_options_t*);extern void leveldb_options_set_comparator(leveldb_options_t*,leveldb_comparator_t*);extern void leveldb_options_set_filter_policy(leveldb_options_t*,leveldb_filterpolicy_t*);extern void leveldb_options_set_create_if_missing(leveldb_options_t*, unsigned char);extern void leveldb_options_set_error_if_exists(leveldb_options_t*, unsigned char);extern void leveldb_options_set_paranoid_checks(leveldb_options_t*, unsigned char);extern void leveldb_options_set_env(leveldb_options_t*, leveldb_env_t*);extern void leveldb_options_set_info_log(leveldb_options_t*, leveldb_logger_t*);extern void leveldb_options_set_write_buffer_size(leveldb_options_t*, size_t);extern void leveldb_options_set_max_open_files(leveldb_options_t*, int);extern void leveldb_options_set_cache(leveldb_options_t*, leveldb_cache_t*);extern void leveldb_options_set_block_size(leveldb_options_t*, size_t);extern void leveldb_options_set_block_restart_interval(leveldb_options_t*, int);enum {leveldb_no_compression = 0,leveldb_snappy_compression = 1};extern void leveldb_options_set_compression(leveldb_options_t*, int);/************************************************************** 比较器API *********************************************************************///extern leveldb_comparator_t* leveldb_comparator_create(void* state,void (*destructor)(void*),int (*compare)(void*,const char* a, size_t alen,const char* b, size_t blen),const char* (*name)(void*));extern void leveldb_comparator_destroy(leveldb_comparator_t*);/************************************************************** 过滤器API *********************************************************************///extern leveldb_filterpolicy_t* leveldb_filterpolicy_create(void* state,void (*destructor)(void*),char* (*create_filter)(void*,const char* const* key_array, const size_t* key_length_array,int num_keys,size_t* filter_length),unsigned char (*key_may_match)(void*,const char* key, size_t length,const char* filter, size_t filter_length),const char* (*name)(void*));extern void leveldb_filterpolicy_destroy(leveldb_filterpolicy_t*);extern leveldb_filterpolicy_t* leveldb_filterpolicy_create_bloom(int bits_per_key);/************************************************************** 读选项API *********************************************************************///extern leveldb_readoptions_t* leveldb_readoptions_create();extern void leveldb_readoptions_destroy(leveldb_readoptions_t*);extern void leveldb_readoptions_set_verify_checksums(leveldb_readoptions_t*,unsigned char);extern void leveldb_readoptions_set_fill_cache(leveldb_readoptions_t*, unsigned char);extern void leveldb_readoptions_set_snapshot(leveldb_readoptions_t*,const leveldb_snapshot_t*);/************************************************************** 写选项API *********************************************************************/// 创建写入选项变量extern leveldb_writeoptions_t* leveldb_writeoptions_create();// 销毁extern void leveldb_writeoptions_destroy(leveldb_writeoptions_t*);// 设置写入选项是否异步方式写入extern void leveldb_writeoptions_set_sync(leveldb_writeoptions_t*, unsigned char);/**************************************************************** 缓存API *********************************************************************/// 安居lru算法创建缓存extern leveldb_cache_t* leveldb_cache_create_lru(size_t capacity);// 销毁缓存extern void leveldb_cache_destroy(leveldb_cache_t* cache);/************************************************************ 环境API **********************************************************************/// 创建默认环境变量extern leveldb_env_t* leveldb_create_default_env();// 销毁环境变量extern void leveldb_env_destroy(leveldb_env_t*);/************************************************************ 快照API **********************************************************************/// 创建快照extern const leveldb_snapshot_t* leveldb_create_snapshot(leveldb_t* db);// 将快照和数据库关联extern void leveldb_release_snapshot(leveldb_t* db,const leveldb_snapshot_t* snapshot);/************************************************************ 工具API **********************************************************************/// 获取主版本好extern int leveldb_major_version();// 获取子版本号extern int leveldb_minor_version();