The DB Appender is self written and configured as follows:
<appender name="DB_APPENDER"
class="ch.ergonomics.pms.common.supervision.PMSJDBCAppender">
<param name="PreparedSQL" value="{ ? = call INS_LOG( ?, ?, ?, ?, ?, ? )
}"/>
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern"
value="%F:%L@@%-5p@@%-10X{category}@@%-7t@@%m"/>
</layout>
<filter class="org.apache.log4j.varia.LevelRangeFilter">
<param name="LevelMin" value="warn"/>
<param name="LevelMax" value="fatal"/>
<param name="AcceptOnMatch" value="false"/>
</filter>
</appender>
Here the code of the appender class. Some properties are configured at run-Time
(user, password, connection string etc.)
/**
* PMSJDBCAppender can be used within the log4j framework to log into a DB using
connection pooling and
* prepared statements.
* @author bender
*/
public class PMSJDBCAppender extends JDBCAppender
{
/** Holds the pattern enumeration as defined in the property file */
private String myValues;
/** the sql is defined in property file */
private String myPreparedSQL;
/** the DB access code */
private String myDBAccessCode;
/** the user name */
private String myUserName;
/** the password */
private String myPassword;
/** the connection string */
private String myConnectionString;
/** the JDBCDriver */
private String myJDBCDriver;
/** the statement to insert log entries */
private CallableStatement myCstmt = null;
/** DB connector utility */
private DBConnector myDBConnector = null;
/** standard constructor */
public PMSJDBCAppender()
{
super();
}
/** closes the appender before disposal */
public void finalize()
{
if ( myCstmt != null )
{
try
{
myCstmt.close();
}
catch ( SQLException e )
{
// ignore
}
} // if myCstmt != null
myCstmt = null;
super.finalize();
}
/**
* Creates and prepares the used statement for inserting log informations
into DB.
* <P>
* All exceptions are ignored with the only drawback that no logging into DB
occurs.
*
* @return true if the statement has been prepared, false in all other cases, especially
* if one of the needed strings is not initialized
(ConnectionString, Username,
* Password, JDBCDriver, DBAccessCode).
*/
private boolean createStatement()
{
if ( ( myConnectionString == null )
|| ( myUserName == null )
|| ( myPassword == null )
|| ( myJDBCDriver == null )
|| ( myDBAccessCode == null ) )
{
// not yet properly initialized
myCstmt = null;
return false;
} // if
try
{
if ( myDBConnector == null )
{
myDBConnector = new DBConnector( myConnectionString,
myUserName,
myPassword,
myJDBCDriver,
null ); // <-- no logger is provided, so no loggin occurs
// within DBConnector
} // if myDBConnector == null
myDBConnector.getConnection().setAutoCommit( true );
myCstmt = myDBConnector.getConnection().prepareCall( myPreparedSQL );
myCstmt.registerOutParameter( 1, java.sql.Types.INTEGER );
myCstmt.setString( 2, myDBAccessCode );
return true;
}
catch ( SQLException e )
{
myCstmt = null;
return false;
}
catch ( Exception e )
{
myCstmt = null;
return false;
}
}
/**
* @see org.apache.log4j.jdbc.JDBCAppender#execute(java.lang.String)
*/
public void execute( String aSql )
throws SQLException
{
if ( myCstmt == null )
{
if ( ! createStatement() )
{
return;
} // if ! createStatement()
} // if myCstmt == null
StringTokenizer tokenizer = new StringTokenizer( aSql, "@@" );
int i = 3;
while ( tokenizer.hasMoreTokens() )
{
String token = tokenizer.nextToken().trim();
switch ( i )
{
case 4 : // level. We have to convert the string into the level
number
myCstmt.setInt( i, Level.toLevel( token ).toInt() );
break;
case 6 : // field reference. We put the session id in it
if ( token.equals( "main" ) )
{
myCstmt.setInt( i, 0 );
}
else
{
try
{
myCstmt.setInt( i, new Integer( token.substring( 5 )
).intValue() );
}
catch ( NumberFormatException e )
{
// ignore and insert 0:
myCstmt.setInt( i, 0 );
}
}
break;
default :
myCstmt.setString( i, token );
break;
}
i++;
}
myCstmt.executeUpdate();
}
/**
* property access
* @param aString - the new value of the property
*/
public void setPreparedSQL( String aString )
{
myPreparedSQL = aString;
}
/**
* property access
* @param aString - the new value of the property
*/
public void setValues( String aString )
{
myValues = aString;
}
/**
* @see
org.apache.log4j.jdbc.JDBCAppender#getLogStatement(org.apache.log4j.spi.LoggingEvent)
*/
protected String getLogStatement( LoggingEvent aEvent )
{
// this formats only the message but not the stack trace of the throwable
StringBuffer result = new StringBuffer( super.getLogStatement( aEvent )
);
if ( layout.ignoresThrowable() )
{
String[] s = aEvent.getThrowableStrRep();
if ( s != null )
{
int len = s.length;
for ( int i = 0; i < len; i++ )
{
result.append( Layout.LINE_SEP );
result.append( s[i] );
}
}
}
return result.toString();
}
/**
* property access
* @param aString the new value of the property
*/
public void setDBAccessCode( String aString )
{
myDBAccessCode = aString;
}
/**
* @param aConnectionString The connectionString to set.
*/
public void setConnectionString( String aConnectionString )
{
myConnectionString = aConnectionString;
}
/**
* @param aDriver The jDBCDriver to set.
*/
public void setJDBCDriver( String aDriver )
{
myJDBCDriver = aDriver;
}
/**
* @param aPassword The password to set.
*/
public void setPassword( String aPassword )
{
myPassword = aPassword;
}
/**
* @param aUserName The userName to set.
*/
public void setUserName( String aUserName )
{
myUserName = aUserName;
}
}
-----Original Message-----
From: Rakesh Patel [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 08, 2006 1:44 PM
To: Log4J Users List
Subject: Re: Using the same tables for log4j with JDBC appender and
Log4PLSQL
Hi Heri,
I would be vey interested to know how you configured all
that. Also, is
there no performance hit with all that logging from java to the db?
Rakesh
Bender Heri wrote:
I dont use log4plsql, but I have a System which logs by a
JDBC-Appender to a Oracle-Table, and the stored procedures
within Oracle log exceptions to the same table (by self
written sql-code) without any problem.
Heri
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Sent: Tuesday, March 07, 2006 7:11 PM
To: [email protected]
Subject: Using the same tables for log4j with JDBC appender and
Log4PLSQL
We are foreseing to use Log4PLSQL in our DB & I was wandering
if we could use this for our WebApp too...
I would like to kknow if there are people who use both and
preferably inserting the messages into the same tables ?
Tx,
\T,
-- Any fool can write code that a computer can understand.
Good programmers write code that humans can understand.
Martin Fowler
T. : +32 (0)2 742 05 94
M. : +32 (0)497 44 68 12
@ : [EMAIL PROTECTED]
Do you skype too ... ?
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