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154 lines
4.7 KiB
C
154 lines
4.7 KiB
C
#ifndef ACL_DBPOOL_INCLUDE_H
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#define ACL_DBPOOL_INCLUDE_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "../stdlib/acl_define.h"
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#include <time.h>
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#include "../stdlib/acl_stdlib.h"
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#define ACL_DB_DEBUG_MEM (1<<0)
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typedef struct ACL_DB_HANDLE ACL_DB_HANDLE;
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typedef struct ACL_SQL_RES ACL_SQL_RES;
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typedef struct ACL_DB_POOL ACL_DB_POOL;
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typedef struct ACL_DB_INFO {
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int db_max; /* 连接池最大连接数 */
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char db_addr[256]; /* 数据库服务地址 */
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char db_name[256]; /* 数据库名称 */
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char db_user[256]; /* 数据库帐号 */
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char db_pass[256]; /* 帐号密码 */
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unsigned long db_flags; /* (mysql) 连接标志位 */
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int ping_inter; /* 探测数据库连接的时间间隔 */
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int timeout_inter; /* 数据库连接的空闲超时时间 */
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int auto_commit; /* (mysql) 是否启用自动提交过程 */
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int conn_timeout; /* (mysql/null) 连接超时时间 */
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int rw_timeout; /* (mysql/null) IO读写超时时间 */
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int buf_size; /* (null) IO缓冲区大小 */
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int debug_flag; /* 调试标志位 */
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/* 在真实连接数据库之前/后调用用户设置的回调函数, 此项可以设为 NULL,
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* 如果 db_before_connect/db_after_connect 返回 < 0 则会导致
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* acl_dbpool_peek 返回 NULL
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*/
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int (*db_before_connect)(ACL_DB_HANDLE* db_handle, void *ctx);
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int (*db_after_connect)(ACL_DB_HANDLE* db_handle, void *ctx);
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void *ctx; /* db_before_connect/db_after_connect 参数之一 */
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} ACL_DB_INFO;
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struct ACL_DB_HANDLE {
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#define ACL_DBH_STATUS_NULL 0
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#define ACL_DBH_STATUS_READY 1
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#define ACL_DBH_STATUS_INUSE 2
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int status;
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time_t timeout;
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time_t ping;
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ACL_DB_POOL *parent;
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int (*sql_results)(ACL_DB_HANDLE *handle, const char *sql, int *error,
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int (*walk_fn)(const void** result_row, void *arg), void *arg);
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int (*sql_result)(ACL_DB_HANDLE *handle, const char *sql, int *error,
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int (*callback)(const void** result_row, void *arg), void *arg);
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int (*sql_update)(ACL_DB_HANDLE *handle, const char *sql, int *error);
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ACL_SQL_RES *(*sql_select)(ACL_DB_HANDLE *handle, const char *sql, int *error);
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void (*free_result)(ACL_SQL_RES *res);
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};
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struct ACL_SQL_RES {
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void *res;
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int num;
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/* for acl_iterator */
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/* 取迭代器头函数 */
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const void *(*iter_head)(ACL_ITER*, struct ACL_SQL_RES*);
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/* 取迭代器下一个函数 */
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const void *(*iter_next)(ACL_ITER*, struct ACL_SQL_RES*);
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};
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struct ACL_DB_POOL {
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ACL_DB_INFO db_info;
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ACL_DB_HANDLE *(*dbh_peek)(ACL_DB_POOL *);
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void (*dbh_check)(ACL_DB_POOL *);
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void (*dbh_release)(ACL_DB_HANDLE *);
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void *(*dbh_export)(ACL_DB_HANDLE *);
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void (*dbh_close)(ACL_DB_HANDLE *);
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int (*dbh_ping)(ACL_DB_HANDLE *);
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void (*destroy)(ACL_DB_POOL *);
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int db_max;
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int db_ready;
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int db_inuse;
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};
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/*----------------------------------------------------------------------------*/
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#define ACL_DB_AUTO_COMMIT(_db_pool_) (_db_pool_ ? _db_pool_->db_info.auto_commit : 0)
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/* in acl_dbpool.c */
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/**
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* 创建一个数据库连接池
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* @param db_type {const char*} 数据库类型名, 目前仅支持 mysql
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* @param db_info {const ACL_DB_INFO*} 记录着有关连接数据所需要的信息
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* @return {ACL_DB_POOL*} 一个数据库连接池
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*/
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ACL_API ACL_DB_POOL *acl_dbpool_create(const char *db_type, const ACL_DB_INFO *db_info);
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/**
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* 销毁一个数据库连接池
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* @param db_pool 数据库连接池句柄
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*/
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ACL_API void acl_dbpool_destroy(ACL_DB_POOL *db_pool);
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/**
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* 从连接池中获取一个连接句柄
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* @param db_pool {ACL_DB_POOL*} 数据库连接池句柄
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* @return {ACL_DB_HANDLE*} 数据库连接句柄，如果为空则表示出错或连接池已满
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*/
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ACL_API ACL_DB_HANDLE *acl_dbpool_peek(ACL_DB_POOL *db_pool);
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/**
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* 手工检查连接池的每个连接?一般连接池内部会定期检查每个连接，
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* 也可以通过此函数手工进行强制检查
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* @param db_pool {ACL_DB_POOL*} 数据库连接池句柄
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*/
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ACL_API void acl_dbpool_check(ACL_DB_POOL *db_pool);
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/**
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* 将数据库连接句柄释放给数据库连接池
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* @param db_handle {ACL_DB_HANDLE*} 数据库连接句柄
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*/
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ACL_API void acl_dbpool_release(ACL_DB_HANDLE *db_handle);
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/**
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* 将数据库连接转换为实际的数据库连接句柄
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* @param db_handle {ACL_DB_HANDLE*} 数据库连接句柄
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* @return void * 使用者需要将其强制转换为自己所用的数据库连接引擎
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*/
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ACL_API void *acl_dbpool_export(ACL_DB_HANDLE *db_handle);
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/**
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* 当使用者自己检测到该数据库连接出错时，可以通过此接口强行关闭该连接
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* @param db_handle {ACL_DB_HANDLE*} 数据库连接句柄
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*/
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ACL_API void acl_dbpool_close(ACL_DB_HANDLE *db_handle);
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/**
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* 设置连接池的定时PING处理函数，如果不设置此值则内部采用缺省方式
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* @param db_pool {ACL_DB_POOL*} 数据库连接池句柄
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* @param ping_fn {int (*)(ACL_DB_HANDLE*)} 探测连接状态的函数指针
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*/
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ACL_API void acl_dbpool_set_ping(ACL_DB_POOL *db_pool, int (*ping_fn)(ACL_DB_HANDLE*));
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/*----------------------------------------------------------------------------*/
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#ifdef __cplusplus
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}
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#endif
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#endif
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