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| version 1.2, 2001/04/05 11:01:55 | version 1.30.2.7.2.2, 2003/03/20 08:11:13 |
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| Line 1 | Line 1 |
| /** @file | /** @file |
| Parser: sql connection decl. | Parser: sql fconnection decl. |
| Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) | Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com) |
| Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) | |
| Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf) | |
| $Id$ | |
| */ | */ |
| #ifndef PA_SQL_CONNECTION_H | #ifndef PA_SQL_CONNECTION_H |
| #define PA_SQL_CONNECTION_H | #define PA_SQL_CONNECTION_H |
| #include "pa_pool.h" | static const char* IDENT_SQL_CONNECTION_H="$Date$"; |
| #include "pa_sql_driver.h" | #include "pa_sql_driver.h" |
| #include "pa_exception.h" | #include "pa_sql_driver_manager.h" |
| /// sql connection | // defines |
| class SQL_Connection : public Pooled { | |
| /// @see SQL_Driver_services_impl::_throw | |
| #ifdef PA_WITH_SJLJ_EXCEPTIONS | |
| #define SQL_CONNECTION_SERVICED_FUNC_GUARDED(actions) actions | |
| #else | |
| #define SQL_CONNECTION_SERVICED_FUNC_GUARDED(actions) \ | |
| if(!setjmp(fservices.mark)) { \ | |
| actions; \ | |
| } else \ | |
| fservices.propagate_exception(); | |
| #endif | |
| /// SQL_Driver_services Pooled implementation | |
| class SQL_Driver_services_impl: public SQL_Driver_services { | |
| Pool *fpool; | |
| const String& furl; | |
| Exception fexception; | |
| public: | public: |
| SQL_Driver_services_impl(): fpool(0), furl(0) {} | |
| void set_pool_and_url(Pool *const String& aurl) { fpool=apool; furl=aurl;} | |
| override void *malloc(size_t size) { return fpool->malloc(size); } | |
| override void *calloc(size_t size) { return fpool->calloc(size); } | |
| override void *realloc(void *ptr, size_t size) { return fpool->realloc(ptr, size); } | |
| /** | |
| normally we can't 'throw' from dynamic library, so | |
| the idea is to #1 jump to C++ some function to main body, where | |
| every function stack frame has exception unwind information | |
| and from there... #2 propagate_exception() | |
| but when parser configured --with-sjlj-exceptions | |
| one can simply 'throw' from dynamic library. | |
| [sad story: one can not longjump/throw due to some bug in gcc as of 3.2.1 version] | |
| */ | |
| override void _throw(const SQL_Error& aexception) { | |
| // converting SQL_exception to parser Exception | |
| // hiding passwords and addresses from accidental show [imagine user forgot @exception] | |
| #ifdef PA_WITH_SJLJ_EXCEPTIONS | |
| throw | |
| #else | |
| fexception= | |
| #endif | |
| Exception(aexception.type(), | |
| url_without_login(), | |
| aexception.comment()); | |
| void set_services(Services_for_SQL_driver *services) { | #ifndef PA_WITH_SJLJ_EXCEPTIONS |
| fdriver.set_services(services); | longjmp(mark, 1); |
| #endif | |
| } | |
| virtual void propagate_exception() { | |
| #ifndef PA_WITH_SJLJ_EXCEPTIONS | |
| throw fexception; | |
| #endif | |
| } | } |
| SQL_Connection(Pool& pool, | private: |
| const String& aurl, | const String& url_without_login() const; |
| SQL_Driver& adriver, Services_for_SQL_driver& services, | }; |
| char *url_cstr) : Pooled(pool), | |
| /// SQL connection. handy wrapper around low level SQL_Driver | |
| class SQL_Connection: public PA_Object { | |
| const String& furl; | |
| SQL_Driver& fdriver; | |
| SQL_Driver_services_impl fservices; | |
| void *fconnection; | |
| time_t time_used; | |
| bool marked_to_rollback; | |
| public: | |
| SQL_Connection(const String& aurl, SQL_Driver& adriver): | |
| furl(aurl), | furl(aurl), |
| fdriver(adriver) { | fdriver(adriver), |
| fconnection(0), | |
| time_used(0), | |
| marked_to_rollback(false) { | |
| } | |
| const String& get_url() { return furl; } | |
| set_services(&services); // associate with services[request] | void set_pool() { |
| fdriver.connect(url_cstr, &connection); | fservices.set_pool_and_url(pool?furl:0); |
| } | |
| bool expired(time_t older_dies) { | |
| return /*!freferences && */time_used<older_dies; | |
| } | } |
| time_t get_time_used() { return time_used; } | |
| void close() { | bool connected() { return fconnection!=0; } |
| set_services(0); // deassociate from services[request] | void connect(char *used_only_in_connect_url_cstr) { |
| SQL_driver_manager->close_connection(furl, *this); | SQL_CONNECTION_SERVICED_FUNC_GUARDED( |
| fdriver.connect(used_only_in_connect_url_cstr, fservices, &fconnection) | |
| ); | |
| } | |
| void disconnect() { | |
| fdriver.disconnect(fconnection); fconnection=0; | |
| } | |
| bool ping() { | |
| SQL_CONNECTION_SERVICED_FUNC_GUARDED( | |
| return fdriver.ping(fservices, fconnection) | |
| ); | |
| return 0; // never reached | |
| } | |
| uint quote(char *to, const char* from, unsigned int length) { | |
| SQL_CONNECTION_SERVICED_FUNC_GUARDED( | |
| return fdriver.quote(fservices, fconnection, to, from, length) | |
| ); | |
| return 0; // never reached | |
| } | } |
| void disconnect() { fdriver.disconnect(connection); } | |
| void commit() { fdriver.commit(connection); } | |
| void rollback() { fdriver.rollback(connection); } | |
| void query( | void query( |
| const char *statement, | const char* statement, unsigned long offset, unsigned long limit, |
| unsigned int *column_count, SQL_Driver::Cell **columns, | SQL_Driver_query_event_handlers& handlers, |
| unsigned long *row_count, SQL_Driver::Cell ***rows) { | const String* source) { |
| fdriver.query(connection, | try { |
| statement, | SQL_CONNECTION_SERVICED_FUNC_GUARDED( |
| column_count, columns, | fdriver.query(fservices, fconnection, |
| row_count, rows); | statement, offset, limit, |
| handlers) | |
| ); | |
| } catch(const Exception& e) { // query problem | |
| if(strcmp(e.type(), "sql.connect")==0) { // if it is _throw exception, | |
| // give more specific source [were url] | |
| throw Exception("sql.execute", | |
| source, | |
| "%s", e.comment()); | |
| } else | |
| rethrow; | |
| } | |
| } | } |
| void mark_to_rollback() { | |
| marked_to_rollback=true; | |
| } | |
| private: | private: // closing process |
| void commit() { | |
| SQL_CONNECTION_SERVICED_FUNC_GUARDED( | |
| fdriver.commit(fservices, fconnection) | |
| ); | |
| } | |
| void rollback() { | |
| SQL_CONNECTION_SERVICED_FUNC_GUARDED( | |
| fdriver.rollback(fservices, fconnection) | |
| ); | |
| } | |
| /// return to cache | |
| void close() { | |
| if(marked_to_rollback) { | |
| rollback(); | |
| marked_to_rollback=false; | |
| } else | |
| commit(); | |
| SQL_driver_manager.close_connection(furl, SQL_ConnectionPtr(this)); | |
| } | |
| SQL_Driver& fdriver; | |
| void *connection; | |
| const String& furl; | |
| }; | }; |
| #endif | #endif |