Question

I need to log all the queries to an Oracle database in my project to a log file.

What would be a good solution to achieve this? Some sample usage would be appreciated.

I have looked at SLF4J with jdbcdslog, but I’m not sure how I can log to a file with it. Moreover, I would need to “filter” some of the logs (because I don’t need to know when some getxxxx method get’s invoked)

Preferably, I’d prefer to use java.util.logging but it is not a requirement.

Thanks.

** UPDATE **

I found this Oracle article, however it does not really tell how to programatically do the same thing.

Answer 1

After much reading, this is how I got things working :

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NOTE : Fore more information, read the Oracle Diagnosability in JDBC document

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Properties prop = new Properties();
prop.put ("user", USER);
prop.put ("password", PASS);
// prop.put(propname, propValue);

Class.forName("oracle.jdbc.driver.OracleDriver");

enableLogging(false);

conn = DriverManager.getConnection("jdbc:oracle:thin:@"+HOST+":"+PORT+":"+SID, prop);

And here’s the magic :

static private void enableLogging(boolean logDriver) 
throws MalformedObjectNameException, NullPointerException, 
       AttributeNotFoundException, InstanceNotFoundException, 
       MBeanException, ReflectionException, InvalidAttributeValueException, 
       SecurityException, FileNotFoundException, IOException 
{
    oracle.jdbc.driver.OracleLog.setTrace(true);

    // compute the ObjectName
    String loader = Thread.currentThread().getContextClassLoader().toString().replaceAll("[,=:\"]+", "");
    javax.management.ObjectName name = new javax.management.ObjectName("com.oracle.jdbc:type=diagnosability,name="+loader);

    // get the MBean server
    javax.management.MBeanServer mbs = java.lang.management.ManagementFactory.getPlatformMBeanServer();

    // find out if logging is enabled or not
    System.out.println("LoggingEnabled = " + mbs.getAttribute(name, "LoggingEnabled"));

    // enable logging
    mbs.setAttribute(name, new javax.management.Attribute("LoggingEnabled", true));

    File propFile = new File("path/to/properties");
    LogManager logManager = LogManager.getLogManager();
    logManager.readConfiguration(new FileInputStream(propFile));

    if (logDriver) {
        DriverManager.setLogWriter(new PrintWriter(System.err));
    }
}

The properties file (from Oracle’s documentation) :

.level=SEVERE
oracle.jdbc.level=INFO
oracle.jdbc.handlers=java.util.logging.ConsoleHandler
java.util.logging.ConsoleHandler.level=INFO
java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter

Basically, this is where the handlers are declared

oracle.jdbc.handlers=java.util.logging.ConsoleHandler

Declares the ConsoleHandler to be used by Oracle’s JDBC driver. Any and any number of handlers can be declared here, one per line, with the class’ full qualified name :

oracle.jdbc.handlers=java.util.logging.ConsoleHandler
oracle.jdbc.handlers=java.util.logging.FileHandler
...

One can provide their own custom made handlers with the same rule. The following lines are to setup the handler

java.util.logging.ConsoleHandler.level=INFO

will call the methode setLevel(Level.INFO) of the ConsoleHandler handler instance.

com.my.own.project.logging.handler.MyHandler.foo=Bar

will call the method setFoo("Bar") of the MyHandler handler instance. And that’s it.

Happy logging!