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| version 1.2, 2001/04/04 11:47:29 | version 1.6.2.1, 2001/04/17 15:02:04 |
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| Line 24 SQL_Driver_manager *SQL_driver_manager; | Line 24 SQL_Driver_manager *SQL_driver_manager; |
| const int MAX_PROTOCOL=20; | const int MAX_PROTOCOL=20; |
| const char *LIBRARY_CREATE_FUNC_NAME="create"; | const char *LIBRARY_CREATE_FUNC_NAME="create"; |
| /// Services_for_SQL_driver implementation | |
| class Services_for_SQL_driver_impl : public Services_for_SQL_driver, public Pooled { | |
| public: | |
| Services_for_SQL_driver_impl(Pool& apool, const String& aurl) : Pooled(apool), | |
| furl(aurl) { | |
| } | |
| /// allocates some bytes on pool | |
| void *malloc(size_t size) { return Pooled::malloc(size); } | |
| /// allocates some bytes clearing them with zeros | |
| void *calloc(size_t size) { return Pooled::calloc(size); } | |
| /// throw exception | |
| void _throw(const char *comment) { | |
| THROW(0, 0, | |
| &furl, | |
| comment); | |
| } | |
| private: | |
| const String& furl; | |
| }; | |
| // SQL_Driver_manager | |
| // url: | // url: |
| // protocol://user:pass@host:port/database | // protocol://user:pass@host:port/database |
| // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is driver-dependent | // ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is driver-dependent |
| SQL_Connection& SQL_Driver_manager::get_connection(const String& url, | SQL_Connection& SQL_Driver_manager::get_connection(const String& url, |
| Table *protocol2library) { | Table *protocol2driver_and_client) { |
| SYNCHRONIZED(true); | SYNCHRONIZED(true); |
| Pool& pool=url.pool(); // request pool | Pool& pool=url.pool(); // request pool |
| // we have table for locating protocol's library | // we have table for locating protocol's library |
| if(!protocol2library) | if(!protocol2driver_and_client) |
| PTHROW(0, 0, | PTHROW(0, 0, |
| &url, | &url, |
| "SQL:drivers table must be defined"); | "$SQL:drivers table must be defined"); |
| // first trying to get cached connection | // first trying to get cached connection |
| if(SQL_Connection *result=get_connection_from_cache(url)) | if(SQL_Connection *result=get_connection_from_cache(url)) |
| return *result; | if(result->ping()) |
| return *result; | |
| else | |
| result->disconnect(); // kill unpingabe=dead connection | |
| // no cached connection | // no cached connection |
| int pos=url.pos("://", 3); | int pos=url.pos("://", 3); |
| Line 62 SQL_Connection& SQL_Driver_manager::get_ | Line 90 SQL_Connection& SQL_Driver_manager::get_ |
| url_cstr++; | url_cstr++; |
| SQL_Driver *driver; | SQL_Driver *driver; |
| const String *dlopen_file_spec=0; | |
| // first trying to get cached driver | // first trying to get cached driver |
| if(!(driver=get_driver_from_cache(protocol))) { | if(!(driver=get_driver_from_cache(protocol))) { |
| // no cached | // no cached |
| const String *library=0; | const String *library=0; |
| if(protocol2library->locate(0, protocol)) { | if(protocol2driver_and_client->locate(0, protocol)) { |
| if(!(library=protocol2library->item(1)) || library->size()==0) | if(!(library=protocol2driver_and_client->item(1)) || library->size()==0) |
| PTHROW(0, 0, | |
| protocol2driver_and_client->origin_string(), | |
| "driver library column for protocol '%s' is empty", protocol_cstr); | |
| if(!(dlopen_file_spec=protocol2driver_and_client->item(2)) || dlopen_file_spec->size()==0) | |
| PTHROW(0, 0, | PTHROW(0, 0, |
| protocol2library->origin_string(), | protocol2driver_and_client->origin_string(), |
| "library column for protocol '%s' is empty", protocol_cstr); | "client library column for protocol '%s' is empty", protocol_cstr); |
| } else | } else |
| PTHROW(0, 0, | PTHROW(0, 0, |
| &url, | &url, |
| Line 95 SQL_Connection& SQL_Driver_manager::get_ | Line 128 SQL_Connection& SQL_Driver_manager::get_ |
| // validate driver api version | // validate driver api version |
| int driver_api_version=driver->api_version(); | int driver_api_version=driver->api_version(); |
| if(driver_api_version<SQL_API_VERSION) | if(driver_api_version!=SQL_DRIVER_API_VERSION) |
| PTHROW(0, 0, | |
| library, | |
| "driver implements API version 0x%04X not equal to 0x%04X", | |
| driver_api_version, SQL_DRIVER_API_VERSION); | |
| // initialise by connecting to sql client dynamic link library | |
| const char *dlopen_file_spec_cstr=dlopen_file_spec->cstr(String::UL_FILE_NAME); | |
| if(const char *error=driver->initialize( | |
| dlopen_file_spec_cstr)) | |
| PTHROW(0, 0, | PTHROW(0, 0, |
| library, | library, |
| "driver API version is 0x%04X while current minimum is 0x%04X", | "driver failed to initialize client library '%s', %s", |
| driver_api_version, SQL_API_VERSION); | dlopen_file_spec_cstr, error); |
| // cache it | // cache it |
| put_driver_to_cache(protocol, *driver); | put_driver_to_cache(protocol, *driver); |
| } | } |
| return *new(this->pool()) SQL_Connection(url.pool(), //< associate with request | // services associated with request |
| *driver, url_cstr, url); | Services_for_SQL_driver_impl& services= |
| *new(pool) Services_for_SQL_driver_impl(pool, url); | |
| // allocate in global pool | |
| // associate with services[request], deassociates at close | |
| SQL_Connection& result= | |
| *new(this->pool()) SQL_Connection(this->pool(), | |
| url, *driver, services, url_cstr); | |
| return result; | |
| } | } |
| void SQL_Driver_manager::close_connection(const String& url, | void SQL_Driver_manager::close_connection(const String& url, |
| SQL_Connection& connection) { | SQL_Connection& connection) { |
| SYNCHRONIZED(true); | SYNCHRONIZED(true); |
| connection.set_pool(0); // deassociate from request | |
| put_connection_to_cache(url, connection); | put_connection_to_cache(url, connection); |
| } | } |