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Annotation of parser3/src/sql/pa_sql_driver.h, revision 1.7

1.1       paf         1: /** @file
                      2:        Parser: sql driver interface.
                      3: 
                      4:        Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
                      5: 
                      6:        Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
                      7: 
1.7     ! paf         8:        $Id: pa_sql_driver.h,v 1.6 2001/04/17 19:00:46 paf Exp $
1.1       paf         9: 
                     10: 
                     11:        driver dynamic library must look like this:
                     12:        @code
                     13:                class X_SQL_Driver : public SQL_Driver {
                     14:                public:
                     15: 
                     16:                        X_SQL_Driver() : SQL_driver() {}
                     17: 
                     18:                        int api_version() { return SQL_DRIVER_API_VERSION; }
                     19:                        
                     20:                        //...
                     21:                };
                     22: 
                     23:                extern "C" SQL_Driver *create() {
                     24:                        return new X_SQL_Driver();
                     25:                }       
                     26:        @endcode
                     27: */
                     28: 
                     29: #ifndef PA_SQL_DRIVER_H
                     30: #define PA_SQL_DRIVER_H
                     31: 
1.2       paf        32: #include <sys/types.h>
1.1       paf        33: 
                     34: /// service functions for SQL driver to use
1.7     ! paf        35: class SQL_Driver_services {
1.1       paf        36: public:
                     37:        /// allocates some bytes on pool
                     38:        virtual void *malloc(size_t size) =0;
                     39:        /// allocates some bytes clearing them with zeros
                     40:        virtual void *calloc(size_t size) =0;
                     41:        /// throw exception
                     42:        virtual void _throw(const char *comment) =0;
                     43: };
                     44: 
1.6       paf        45: #define SQL_DRIVER_API_VERSION 0x0301
1.1       paf        46: 
                     47: /// SQL driver API
                     48: class SQL_Driver {
                     49: public:
                     50: 
1.2       paf        51:        struct Cell {
                     52:                void *ptr;
                     53:                size_t size;
                     54:        };
                     55: 
                     56: public:
                     57: 
1.1       paf        58:        /// assignes services to driver. you can not use driver until this
1.7     ! paf        59:        void set_services(SQL_Driver_services *aservices) { services=aservices; }
1.1       paf        60: 
                     61:        SQL_Driver() :
1.5       paf        62:                services(0) {
1.1       paf        63:        }
                     64:        /// get api version
                     65:        virtual int api_version() =0;
1.6       paf        66:        /// initialize driver by loading sql dynamic link library
                     67:        virtual const char *initialize(const char *dlopen_file_spec) =0;
1.1       paf        68:        /// connect. @returns true+'connection' on success. 'error' on failure
                     69:        virtual void connect(char *url, void **connection) =0;
                     70:        virtual void disconnect(void *connection) =0;
                     71:        virtual void commit(void *connection) =0;
                     72:        virtual void rollback(void *connection) =0;
1.3       paf        73:        /// @returns true to indicate that connection still alive 
                     74:        virtual bool ping(void *connection) =0;
1.4       paf        75:        /// encodes the string in 'from' to an escaped SQL string
                     76:        virtual unsigned int quote(void *connection,
                     77:                char *to, const char *from, unsigned int length) =0;
1.2       paf        78:        virtual void query(void *connection,
1.3       paf        79:                const char *statement, unsigned long offset, unsigned long limit,
1.2       paf        80:                unsigned int *column_count, Cell **columns,
                     81:                unsigned long *row_count, Cell ***rows) =0;
1.1       paf        82:        /// log error message
                     83:        //static void log(Pool& pool, const char *fmt, ...);
                     84: 
                     85: protected:
                     86: 
1.7     ! paf        87:        SQL_Driver_services *services;
1.1       paf        88: };
                     89: 
                     90: typedef SQL_Driver *(*SQL_Driver_create_func)();
                     91: 
                     92: #endif