The patch does the following:

  Allows you to set the loglevel at runtime by adding ?loglevel=X to the connection URL, where 1 = INFO and 2 = DEBUG.
  Automatically turns on logging by calling DriverManager.setPrintWriter(new PrintWriter(System.out)) if one is not already set.
Adds a Driver.info() message that prints out the version number
Adds member variables logDebug and logInfo that can be checked before making logging methods calls
Adds a build number to the version number string.  This build number will need to be manually incremented when we see fit.

----------------------------------------------------------------------
Modified Files:
 	org/postgresql/Connection.java org/postgresql/Driver.java.in
 	org/postgresql/fastpath/Fastpath.java
 	org/postgresql/jdbc1/DatabaseMetaData.java
 	org/postgresql/jdbc2/Connection.java
 	org/postgresql/jdbc2/DatabaseMetaData.java
 	org/postgresql/largeobject/LargeObjectManager.java
 	org/postgresql/util/PSQLException.java
 	org/postgresql/util/Serialize.java
----------------------------------------------------------------------

src/interfaces/jdbc/org/postgresql/Driver.java.in

@@ -29,13 +29,10 @@ public class Driver implements java.sql.Driver
 
 	// make these public so they can be used in setLogLevel below
 
-	public static final int DEBUG = 0;
+	public static final int DEBUG = 2;
 	public static final int INFO = 1;
-	public static final int WARN = 2;
-	public static final int ERROR = 3;
-	public static final int FATAL = 4;
-
-	private static int logLevel = FATAL;
+        public static boolean logDebug = false;
+        public static boolean logInfo = false;
 
 	static
 	{
@@ -46,7 +43,6 @@ public class Driver implements java.sql.Driver
 			// my early jdbc work did - and that was based on other examples).
 			// Placing it here, means that the driver is registered once only.
 			java.sql.DriverManager.registerDriver(new Driver());
-
 		}
 		catch (SQLException e)
 		{
@@ -106,7 +102,12 @@ public class Driver implements java.sql.Driver
 	 *	 to/from the database to unicode.  If multibyte is enabled on the
 	 *	 server then the character set of the database is used as the default,
 	 *	 otherwise the jvm character encoding is used as the default.
-	 * compatible - This is used to toggle
+         * loglevel - (optional) Enable logging of messages from the driver.
+         *       The value is an integer from 1 to 2 where:
+         *         INFO = 1, DEBUG = 2
+         *       The output is sent to DriverManager.getPrintWriter() if set,
+         *       otherwise it is sent to System.out.
+	 * compatible - (optional) This is used to toggle
 	 *	 between different functionality as it changes across different releases
 	 *	 of the jdbc driver code.  The values here are versions of the jdbc
 	 *	 client and not server versions.  For example in 7.1 get/setBytes
@@ -140,12 +141,12 @@ public class Driver implements java.sql.Driver
 	{
 		if ((props = parseURL(url, info)) == null)
 		{
-			Driver.debug("Error in url" + url);
+			if (Driver.logDebug) Driver.debug("Error in url" + url);
 			return null;
 		}
 		try
 		{
-			Driver.debug("connect " + url);
+			if (Driver.logDebug) Driver.debug("connect " + url);
 
 			org.postgresql.Connection con = (org.postgresql.Connection)(Class.forName("@JDBCCONNECTCLASS@").newInstance());
 			con.openConnection (host(), port(), props, database(), url, this);
@@ -153,7 +154,7 @@ public class Driver implements java.sql.Driver
 		}
 		catch (ClassNotFoundException ex)
 		{
-			Driver.debug("error", ex);
+			if (Driver.logDebug) Driver.debug("error", ex);
 			throw new PSQLException("postgresql.jvm.version", ex);
 		}
 		catch (PSQLException ex1)
@@ -164,7 +165,7 @@ public class Driver implements java.sql.Driver
 		}
 		catch (Exception ex2)
 		{
-			Driver.debug("error", ex2);
+			if (Driver.logDebug) Driver.debug("error", ex2);
 			throw new PSQLException("postgresql.unusual", ex2);
 		}
 	}
@@ -251,7 +252,7 @@ public class Driver implements java.sql.Driver
 	 */
 	public static String getVersion()
 	{
-		return "@VERSION@";
+		return "@VERSION@ jdbc driver build " + m_buildNumber;
 	}
 
 	/*
@@ -293,12 +294,6 @@ public class Driver implements java.sql.Driver
 		{
 			String token = st.nextToken();
 
-			// PM June 29 1997
-			// Added this, to help me understand how this works.
-			// Unless you want each token to be processed, leave this commented out
-			// but don't delete it.
-			//DriverManager.println("wellFormedURL: state="+state+" count="+count+" token='"+token+"'");
-
 			// PM Aug 2 1997 - Modified to allow multiple backends
 			if (count <= 3)
 			{
@@ -379,7 +374,6 @@ public class Driver implements java.sql.Driver
 					else if (state == -5)
 					{
 						value = token;
-						//DriverManager.println("put("+key+","+value+")");
 						urlProps.put(key, value);
 						state = -2;
 					}
@@ -387,13 +381,6 @@ public class Driver implements java.sql.Driver
 			}
 		}
 
-		// PM June 29 1997
-		// This now outputs the properties only if we are logging
-		// PM Sep 13 1999 Commented out, as it throws a Deprecation warning
-		// when compiled under JDK1.2.
-		//if (DriverManager.getLogStream() != null)
-		//	urlProps.list(DriverManager.getLogStream());
-
 		return urlProps;
 
 	}
@@ -446,12 +433,13 @@ public class Driver implements java.sql.Driver
 	*	used to turn logging on to a certain level, can be called 
 	*	by specifying fully qualified class ie org.postgresql.Driver.setLogLevel()
 	*	@param int logLevel sets the level which logging will respond to
-	* 	FATAL being almost no messages
+	* 	INFO being almost no messages
 	*	DEBUG most verbose
 	*/
 	public static void setLogLevel(int logLevel)
 	{
-		Driver.logLevel = logLevel;
+            logDebug = (logLevel >= DEBUG) ? true : false;
+            logInfo = (logLevel >= INFO) ? true : false;
 	}
 	/*
 	 * logging message at the debug level
@@ -459,7 +447,7 @@ public class Driver implements java.sql.Driver
 	 */
 	public static void debug(String msg)
 	{
-		if (logLevel <= DEBUG)
+		if (logDebug)
 		{
 			DriverManager.println(msg);
 		}
@@ -470,7 +458,7 @@ public class Driver implements java.sql.Driver
 	 */
 	public static void debug(String msg, Exception ex)
 	{
-		if (logLevel <= DEBUG)
+		if (logDebug)
 		{
 			DriverManager.println(msg + ex != null ? ex.getMessage() : "null Exception");
 		}
@@ -481,7 +469,7 @@ public class Driver implements java.sql.Driver
 	 */
 	public static void info(String msg)
 	{
-		if (logLevel <= INFO)
+		if (logInfo)
 		{
 			DriverManager.println(msg);
 		}
@@ -492,75 +480,13 @@ public class Driver implements java.sql.Driver
 	 */
 	public static void info(String msg, Exception ex)
 	{
-		if (logLevel <= INFO)
-		{
-			DriverManager.println(msg + ex != null ? ex.getMessage() : "null Exception");
-		}
-	}
-	/*
-	 * logging message at warn level
-	 * messages will be printed if the logging level is less or equal to WARN
-	 */
-	public static void warn(String msg)
-	{
-		if (logLevel <= WARN)
-		{
-			DriverManager.println(msg);
-		}
-	}
-	/*
-	 * logging message at warn level
-	 * messages will be printed if the logging level is less or equal to WARN
-	 */
-	public static void warn(String msg, Exception ex)
-	{
-		if (logLevel <= WARN)
-		{
-			DriverManager.println(msg + ex != null ? ex.getMessage() : "null Exception");
-		}
-	}
-	/*
-	 * logging message at error level
-	 * messages will be printed if the logging level is less or equal to ERROR
-	 */
-	public static void error(String msg)
-	{
-		if (logLevel <= ERROR)
-		{
-			DriverManager.println(msg);
-		}
-	}
-	/*
-	 * logging message at error level
-	 * messages will be printed if the logging level is less or equal to ERROR
-	 */
-	public static void error(String msg, Exception ex)
-	{
-		if (logLevel <= ERROR)
-		{
-			DriverManager.println(msg + ex != null ? ex.getMessage() : "null Exception");
-		}
-	}
-	/*
-	 * logging message at fatal level
-	 * messages will be printed if the logging level is less or equal to FATAL
-	 */
-	public static void fatal(String msg)
-	{
-		if (logLevel <= FATAL)
-		{
-			DriverManager.println(msg);
-		}
-	}
-	/*
-	 * logging message at fatal level
-	 * messages will be printed if the logging level is less or equal to FATAL
-	 */
-	public static void fatal(String msg, Exception ex)
-	{
-		if (logLevel <= FATAL)
+		if (logInfo)
 		{
 			DriverManager.println(msg + ex != null ? ex.getMessage() : "null Exception");
 		}
 	}
+
+        //The build number should be incremented for every new build
+        private static int m_buildNumber = 100;
+
 }

src/interfaces/jdbc/org/postgresql/fastpath/Fastpath.java

 package org.postgresql.fastpath;
 
+import org.postgresql.Driver;
 import java.io.*;
 import java.lang.*;
 import java.net.*;
@@ -44,7 +45,6 @@ public class Fastpath
         {
                 this.conn = conn;
                 this.stream = stream;
-                //DriverManager.println("Fastpath initialised");
         }
 
         /*
@@ -174,7 +174,7 @@ public class Fastpath
          */
         public Object fastpath(String name, boolean resulttype, FastpathArg[] args) throws SQLException
         {
-                //DriverManager.println("Fastpath: calling "+name);
+                if (Driver.logDebug) Driver.debug("Fastpath: calling "+name);
                 return fastpath(getID(name), resulttype, args);
         }
 

src/interfaces/jdbc/org/postgresql/jdbc1/DatabaseMetaData.java

@@ -13,7 +13,7 @@ import org.postgresql.util.PSQLException;
 /*
  * This class provides information about the database as a whole.
  *
- * $Id: DatabaseMetaData.java,v 1.45 2002/06/06 14:47:52 davec Exp $
+ * $Id: DatabaseMetaData.java,v 1.46 2002/06/11 02:55:16 barry Exp $
  *
  * <p>Many of the methods here return lists of information in ResultSets.  You
  * can use the normal ResultSet methods such as getString and getInt to
@@ -1731,7 +1731,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
 			String relKind;
 			switch (r.getBytes(3)[0])
 			{
-				case (byte) 'r':
+				case (byte) 'r':                                        
 					if ( r.getString(1).startsWith("pg_") )
                                         {
                                                 relKind = "SYSTEM TABLE";
@@ -2108,7 +2108,6 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
 		{
 			byte[][] tuple = new byte[8][0];
 			tuple[0] = tuple[1] = "".getBytes();
-			DriverManager.println("relname=\"" + r.getString(1) + "\" relacl=\"" + r.getString(2) + "\"");
 
 			// For now, don't add to the result as relacl needs to be processed.
 			//v.addElement(tuple);

src/interfaces/jdbc/org/postgresql/jdbc2/Connection.java

@@ -17,7 +17,7 @@ import org.postgresql.largeobject.*;
 import org.postgresql.util.*;
 
 /*
- * $Id: Connection.java,v 1.18 2002/03/26 05:52:50 barry Exp $
+ * $Id: Connection.java,v 1.19 2002/06/11 02:55:16 barry Exp $
  *
  * A Connection represents a session with a specific database.	Within the
  * context of a Connection, SQL statements are executed and results are
@@ -318,6 +318,14 @@ public class Connection extends org.postgresql.Connection implements java.sql.Co
                                                                                                 Types.ARRAY
                                                                                         };
 
+        //Because the get/setLogStream methods are deprecated in JDBC2
+        //we use the get/setLogWriter methods here for JDBC2 by overriding
+        //the base version of this method
+        protected void enableDriverManagerLogging() {
+            if (DriverManager.getLogWriter() == null) {
+                DriverManager.setLogWriter(new PrintWriter(System.out));
+	    }
+	}
 
 }
 

src/interfaces/jdbc/org/postgresql/largeobject/LargeObjectManager.java

 package org.postgresql.largeobject;
 
+import org.postgresql.Driver;
 import java.io.*;
 import java.lang.*;
 import java.net.*;
@@ -117,7 +118,7 @@ public class LargeObjectManager
 
 		fp.addFunctions(res);
 		res.close();
-		DriverManager.println("Large Object initialised");
+		if (Driver.logDebug) Driver.debug("Large Object initialised");
 	}
 
 	/*

src/interfaces/jdbc/org/postgresql/util/Serialize.java

 package org.postgresql.util;
 
+import org.postgresql.Driver;
 import java.io.*;
 import java.lang.*;
 import java.lang.reflect.*;
@@ -128,14 +129,14 @@ public class Serialize
 		try
 		{
 			conn = c;
-			DriverManager.println("Serialize: initializing instance for type: " + type);
+			if (Driver.logDebug) Driver.debug("Serialize: initializing instance for type: " + type);
 			tableName = toPostgreSQL(type);
 			className = type;
 			ourClass = Class.forName(className);
 		}
 		catch (ClassNotFoundException cnfe)
 		{
-			DriverManager.println("Serialize: " + className + " java class not found");
+			if (Driver.logDebug) Driver.debug("Serialize: " + className + " java class not found");
 			throw new PSQLException("postgresql.serial.noclass", type);
 		}
 
@@ -147,14 +148,14 @@ public class Serialize
 			if (rs.next())
 			{
 				status = true;
-				DriverManager.println("Serialize: " + tableName + " table found");
+				if (Driver.logDebug) Driver.debug("Serialize: " + tableName + " table found");
 			}
 			rs.close();
 		}
 		// This should never occur, as org.postgresql has it's own internal checks
 		if (!status)
 		{
-			DriverManager.println("Serialize: " + tableName + " table not found");
+			if (Driver.logDebug) Driver.debug("Serialize: " + tableName + " table not found");
 			throw new PSQLException("postgresql.serial.table", type);
 		}
 		// Finally cache the fields within the table
@@ -186,9 +187,9 @@ public class Serialize
 	{
 		try
 		{
-			DriverManager.println("Serialize.fetch: " + "attempting to instantiate object of type: " + ourClass.getName() );
+			if (Driver.logDebug) Driver.debug("Serialize.fetch: " + "attempting to instantiate object of type: " + ourClass.getName() );
 			Object obj = ourClass.newInstance();
-			DriverManager.println("Serialize.fetch: " + "instantiated object of type: " + ourClass.getName() );
+			if (Driver.logDebug) Driver.debug("Serialize.fetch: " + "instantiated object of type: " + ourClass.getName() );
 
 			// NB: we use java.lang.reflect here to prevent confusion with
 			// the org.postgresql.Field
@@ -219,7 +220,7 @@ public class Serialize
 			sb.append(" where oid=");
 			sb.append(oid);
 
-			DriverManager.println("Serialize.fetch: " + sb.toString());
+			if (Driver.logDebug) Driver.debug("Serialize.fetch: " + sb.toString());
 			ResultSet rs = conn.ExecSQL(sb.toString());
 
 			if (rs != null)
@@ -388,7 +389,7 @@ public class Serialize
 				sb.append(')');
 			}
 
-			DriverManager.println("Serialize.store: " + sb.toString() );
+			if (Driver.logDebug) Driver.debug("Serialize.store: " + sb.toString() );
 			org.postgresql.ResultSet rs = (org.postgresql.ResultSet) conn.ExecSQL(sb.toString());
 
 			// fetch the OID for returning
@@ -495,13 +496,13 @@ public class Serialize
 		ResultSet rs = con.ExecSQL("select relname from pg_class where relname = '" + tableName + "'");
 		if ( rs.next() )
 		{
-			DriverManager.println("Serialize.create: table " + tableName + " exists, skipping");
+			if (Driver.logDebug) Driver.debug("Serialize.create: table " + tableName + " exists, skipping");
 			rs.close();
 			return;
 		}
 
 		// else table not found, so create it
-		DriverManager.println("Serialize.create: table " + tableName + " not found, creating" );
+		if (Driver.logDebug) Driver.debug("Serialize.create: table " + tableName + " not found, creating" );
 		// No entries returned, so the table doesn't exist
 
 		StringBuffer sb = new StringBuffer("create table ");
@@ -547,7 +548,7 @@ public class Serialize
 		sb.append(")");
 
 		// Now create the table
-		DriverManager.println("Serialize.create: " + sb );
+		if (Driver.logDebug) Driver.debug("Serialize.create: " + sb );
 		con.ExecSQL(sb.toString());
 	}