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Annotation of parser3/src/include/pa_sql_driver_manager.h, revision 1.8

1.1       paf         1: /** @file
1.2       paf         2:        Parser: sql driver manager decl.
1.1       paf         3: 
                      4:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
                      5: 
                      6:        Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
                      7: 
1.8     ! parser      8:        $Id: pa_sql_driver_manager.h,v 1.7 2001/05/17 18:26:22 parser Exp $
1.1       paf         9: 
                     10: 
                     11:        global sql driver manager, must be thread-safe
                     12: */
                     13: 
                     14: #ifndef PA_SQL_DRIVER_MANAGER_H
                     15: #define PA_SQL_DRIVER_MANAGER_H
                     16: 
1.4       parser     17: #include "pa_config_includes.h"
1.1       paf        18: #include "pa_pool.h"
                     19: #include "pa_sql_driver.h"
                     20: #include "pa_hash.h"
                     21: #include "pa_stack.h"
                     22: #include "pa_table.h"
                     23: #include "pa_string.h"
1.8     ! parser     24: 
        !            25: 
        !            26: // defines
        !            27: 
        !            28: #define MAIN_SQL_NAME "SQL"
        !            29: #define MAIN_SQL_DRIVERS_NAME "drivers"
        !            30: 
        !            31: // forwards
1.1       paf        32: 
                     33: class SQL_Connection;
                     34: 
                     35: /// sql driver manager
                     36: class SQL_Driver_manager : public Pooled {
                     37:        friend SQL_Connection;
                     38: public:
                     39: 
                     40:        SQL_Driver_manager(Pool& pool) : Pooled(pool),
                     41:                driver_cache(pool),
1.7       parser     42:                connection_cache(pool),
                     43:                prev_expiration_pass_time(0) {
1.1       paf        44:        }
                     45: 
                     46:        /** 
                     47:                connect to specified url, 
                     48:                using driver dynamic library found in table, if not loaded yet
                     49:                checks driver version
                     50:        */
1.3       paf        51:        SQL_Connection& get_connection(const String& url, Table *protocol2driver_and_client);
1.1       paf        52: 
                     53: private: // driver cache
                     54: 
                     55:        SQL_Driver *get_driver_from_cache(const String& protocol);
                     56:        void put_driver_to_cache(const String& protocol, SQL_Driver& driver);
                     57: 
                     58: private: // connection cache
                     59: 
                     60:        SQL_Connection *get_connection_from_cache(const String& url);
                     61:        void put_connection_to_cache(const String& url, SQL_Connection& connection);
1.7       parser     62:        void maybe_expire_connection_cache();
                     63: private:
                     64:        time_t prev_expiration_pass_time;
1.1       paf        65: 
                     66: private: // for SQL_Connection
                     67: 
                     68:        /// caches connection
1.6       parser     69:        void close_connection(const String& url, SQL_Connection& connection);
1.1       paf        70: 
                     71: private:
                     72: 
                     73:        Hash driver_cache;
                     74:        Hash connection_cache;
                     75: };
                     76: 
                     77: /// global
                     78: extern SQL_Driver_manager *SQL_driver_manager;
                     79: 
                     80: #endif