import org.apache.log4j.Logger;

import org.apache.log4j.PropertyConfigurator;

import org.apache.log4j.jdbc.*;

/*

    add for log4j: class Logger is the central class in the log4j package.

    we can do most logging operations by Logger except configuration.

    getLogger(...): retrieve a logger by name, if not then create for it.

    */

    static Logger logger = Logger.getLogger

            ( write2database.class.getName () ) ;

/*

        add for log4j: class BasicConfigurator can quickly configure the package.

        print the information to console.

        */

        PropertyConfigurator.configure ( "log4j2database.properties" ) ;

        logger.info ( "just test" ) ;

       运行起来，你就会看到有这样的sql语句被执行了：

       INSERT INTO jws_log  VALUES (''''2005-07-19 17:48:50'''', ''''main'''', ''''INFO'''', ''''write2database.main(write2database.java:33)'''', ''''just test'''', '''''''')

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