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Annotation of parser3/src/sql/pa_sql_driver.h, revision 1.21

1.21    ! paf         1: /** @file
        !             2:        Parser: sql driver interface.
        !             3: 
        !             4:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
        !             5:        Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
        !             6: 
        !             7:        $Id: pa_sql_driver.h,v 1.20 2001/11/05 11:46:29 paf Exp $
        !             8: 
        !             9: 
        !            10:        driver dynamic library must look like this:
        !            11:        @code
        !            12:                class X_SQL_Driver : public SQL_Driver {
        !            13:                public:
        !            14: 
        !            15:                        X_SQL_Driver() : SQL_driver() {}
        !            16: 
        !            17:                        int api_version() { return SQL_DRIVER_API_VERSION; }
        !            18:                        
        !            19:                        //...
        !            20:                };
        !            21: 
        !            22:                extern "C" SQL_Driver *create() {
        !            23:                        return new X_SQL_Driver();
        !            24:                }       
        !            25:        @endcode
        !            26: */
        !            27: 
        !            28: #ifndef PA_SQL_DRIVER_H
        !            29: #define PA_SQL_DRIVER_H
        !            30: 
        !            31: #include <sys/types.h>
        !            32: 
        !            33: /// service functions for SQL driver to use
        !            34: class SQL_Driver_services {
        !            35: public:
        !            36:        /// allocates some bytes on pool
        !            37:        virtual void *malloc(size_t size) =0;
        !            38:        /// allocates some bytes clearing them with zeros
        !            39:        virtual void *calloc(size_t size) =0;
        !            40:        /// prepare throw exception
        !            41:        virtual void _throw(const char *comment) =0;
        !            42:        /// throw C++ exception from prepared
        !            43:        virtual void propagate_exception() =0;
        !            44: public:
        !            45:        /// regretrully public, because can't make stack frames: "nowhere to return to"
        !            46:        jmp_buf mark;
        !            47: };
        !            48: 
        !            49: #define SQL_DRIVER_API_VERSION 0x0002
        !            50: #define SQL_DRIVER_CREATE create
        !            51: #define SQL_DRIVER_CREATE_NAME "create" /* could not figure out how to # it :( */
        !            52: 
        !            53: /// events, occuring when SQL_Driver::query()-ing
        !            54: class SQL_Driver_query_event_handlers {
        !            55: public:
        !            56:        virtual void add_column(void *ptr, size_t size) =0;
        !            57:        virtual void before_rows() =0;
        !            58:        virtual void add_row() =0;
        !            59:        virtual void add_row_cell(void *ptr, size_t size) =0;
        !            60: };
        !            61: 
        !            62: /// SQL driver API
        !            63: class SQL_Driver {
        !            64: public:
        !            65: 
        !            66:        SQL_Driver() {}
        !            67:        /// get api version
        !            68:        virtual int api_version() =0;
        !            69:        /// initialize driver by loading sql dynamic link library
        !            70:        virtual const char *initialize(char *dlopen_file_spec) =0;
        !            71:        /**     connect to sql database using 
        !            72:                @param used_only_to_connect_url 
        !            73:                        format is driver specific
        !            74:                        WARNING: must be used only to connect, for buffer doesn't live long enough
        !            75: 
        !            76:                @returns true+'connection' on success. 'error' on failure
        !            77:        */
        !            78:        virtual void connect(char *used_only_in_connect_url_cstr, 
        !            79:                SQL_Driver_services& services, void **connection) =0;
        !            80:        virtual void disconnect(void *connection) =0;
        !            81:        virtual void commit(
        !            82:                SQL_Driver_services& services, void *connection) =0;
        !            83:        virtual void rollback(
        !            84:                SQL_Driver_services& services, void *connection) =0;
        !            85:        /// @returns true to indicate that connection still alive 
        !            86:        virtual bool ping(
        !            87:                SQL_Driver_services& services, void *connection) =0;
        !            88:        /// encodes the string in 'from' to an escaped SQL string
        !            89:        virtual unsigned int quote(
        !            90:                SQL_Driver_services& services, void *connection,
        !            91:                char *to, const char *from, unsigned int length) =0;
        !            92:        virtual void query(
        !            93:                SQL_Driver_services& services, void *connection,
        !            94:                const char *statement, unsigned long offset, unsigned long limit,
        !            95:                SQL_Driver_query_event_handlers& handlers) =0;
        !            96: };
        !            97: 
        !            98: typedef SQL_Driver *(*SQL_Driver_create_func)();
        !            99: 
        !           100: #endif