/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef _LOG4CXX_DB_ODBC_APPENDER_H #define _LOG4CXX_DB_ODBC_APPENDER_H #if defined(_MSC_VER) #pragma warning ( push ) #pragma warning ( disable: 4231 4251 4275 4786 ) #endif #include #include #include #include #include namespace log4cxx { namespace db { class LOG4CXX_EXPORT SQLException : public log4cxx::helpers::Exception { public: SQLException(short fHandleType, void* hInput, const char* prolog, log4cxx::helpers::Pool& p); SQLException(const char* msg); SQLException(const SQLException& src); private: const char* formatMessage(short fHandleType, void* hInput, const char* prolog, log4cxx::helpers::Pool& p); }; /**

WARNING: This version of ODBCAppender is very likely to be completely replaced in the future. Moreoever, it does not log exceptions.

The ODBCAppender provides for sending log events to a database.

Each append call adds to an ArrayList buffer. When the buffer is filled each log event is placed in a sql statement (configurable) and executed. BufferSize, db URL, User, & Password are configurable options in the standard log4j ways.

The setSql(String sql) sets the SQL statement to be used for logging -- this statement is sent to a PatternLayout (either created automaticly by the appender or added by the user). Therefore by default all the conversion patterns in PatternLayout can be used inside of the statement. (see the test cases for examples)

Overriding the {@link #getLogStatement} method allows more explicit control of the statement used for logging.

For use as a base class:

  • Override getConnection() to pass any connection you want. Typically this is used to enable application wide connection pooling.
  • Override closeConnection -- if you override getConnection make sure to implement closeConnection to handle the connection you generated. Typically this would return the connection to the pool it came from.
  • Override getLogStatement to produce specialized or dynamic statements. The default uses the sql option value.
*/ class LOG4CXX_EXPORT ODBCAppender : public AppenderSkeleton { protected: /** * URL of the DB for default connection handling */ LogString databaseURL; /** * User to connect as for default connection handling */ LogString databaseUser; /** * User to use for default connection handling */ LogString databasePassword; typedef void* SQLHDBC; typedef void* SQLHENV; typedef void* SQLHANDLE; typedef short SQLSMALLINT; /** * Connection used by default. The connection is opened the first time it * is needed and then held open until the appender is closed (usually at * garbage collection). This behavior is best modified by creating a * sub-class and overriding the getConnection and * closeConnection methods. */ SQLHDBC connection; SQLHENV env; /** * Stores the string given to the pattern layout for conversion into a SQL * statement, eg: insert into LogTable (Thread, File, Message) values * ("%t", "%F", "%m") * * Be careful of quotes in your messages! * * Also see PatternLayout. */ LogString sqlStatement; /** * size of LoggingEvent buffer before writing to the database. * Default is 1. */ size_t bufferSize; /** * ArrayList holding the buffer of Logging Events. */ std::list buffer; public: DECLARE_LOG4CXX_OBJECT(ODBCAppender) BEGIN_LOG4CXX_CAST_MAP() LOG4CXX_CAST_ENTRY(ODBCAppender) LOG4CXX_CAST_ENTRY_CHAIN(AppenderSkeleton) END_LOG4CXX_CAST_MAP() ODBCAppender(); virtual ~ODBCAppender(); /** Set options */ virtual void setOption(const LogString& option, const LogString& value); /** Activate the specified options. */ virtual void activateOptions(log4cxx::helpers::Pool& p); /** * Adds the event to the buffer. When full the buffer is flushed. */ void append(const spi::LoggingEventPtr& event, log4cxx::helpers::Pool&); /** * By default getLogStatement sends the event to the required Layout object. * The layout will format the given pattern into a workable SQL string. * * Overriding this provides direct access to the LoggingEvent * when constructing the logging statement. * */ protected: LogString getLogStatement(const spi::LoggingEventPtr& event, helpers::Pool& p) const; /** * * Override this to provide an alertnate method of getting * connections (such as caching). One method to fix this is to open * connections at the start of flushBuffer() and close them at the * end. I use a connection pool outside of ODBCAppender which is * accessed in an override of this method. * */ virtual void execute(const LogString& sql, log4cxx::helpers::Pool& p) /*throw(SQLException)*/; /** * Override this to return the connection to a pool, or to clean up the * resource. * * The default behavior holds a single connection open until the appender * is closed (typically when garbage collected). */ virtual void closeConnection(SQLHDBC con); /** * Override this to link with your connection pooling system. * * By default this creates a single connection which is held open * until the object is garbage collected. */ virtual SQLHDBC getConnection(log4cxx::helpers::Pool& p) /*throw(SQLException)*/; /** * Closes the appender, flushing the buffer first then closing the default * connection if it is open. */ public: virtual void close(); /** * loops through the buffer of LoggingEvents, gets a * sql string from getLogStatement() and sends it to execute(). * Errors are sent to the errorHandler. * * If a statement fails the LoggingEvent stays in the buffer! */ virtual void flushBuffer(log4cxx::helpers::Pool& p); /** * ODBCAppender requires a layout. * */ virtual bool requiresLayout() const { return true; } /** * Set pre-formated statement eg: insert into LogTable (msg) values ("%m") */ void setSql(const LogString& s); /** * Returns pre-formated statement eg: insert into LogTable (msg) values ("%m") */ inline const LogString& getSql() const { return sqlStatement; } inline void setUser(const LogString& user) { databaseUser = user; } inline void setURL(const LogString& url) { databaseURL = url; } inline void setPassword(const LogString& password) { databasePassword = password; } inline void setBufferSize(size_t newBufferSize) { bufferSize = newBufferSize; } inline const LogString& getUser() const { return databaseUser; } inline const LogString& getURL() const { return databaseURL; } inline const LogString& getPassword() const { return databasePassword; } inline size_t getBufferSize() const { return bufferSize; } private: ODBCAppender(const ODBCAppender&); ODBCAppender& operator=(const ODBCAppender&); }; // class ODBCAppender LOG4CXX_PTR_DEF(ODBCAppender); } // namespace db } // namespace log4cxx #if defined(_MSC_VER) #pragma warning ( pop ) #endif #endif // _LOG4CXX_DB_ODBC_APPENDER_H