fixed QueryExecuter to deal with multiple errors

previously it was throwing a SQLException as soon as the error message was
received from the backend. This did not allow the protocol to finish properly
now, simply collects error messages from the backend until the query is done
and throws exception at the end
Also added setLogLevel to Driver.java, and made the log levels public

Author: Dave Cramer

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

@@ -27,11 +27,13 @@ import org.postgresql.util.PSQLException;
 public class Driver implements java.sql.Driver
 {
 
-	protected static final int DEBUG = 0;
-	protected static final int INFO = 1;
-	protected static final int WARN = 2;
-	protected static final int ERROR = 3;
-	protected static final int FATAL = 4;
+	// make these public so they can be used in setLogLevel below
+
+	public static final int DEBUG = 0;
+	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;
 
@@ -439,6 +441,18 @@ public class Driver implements java.sql.Driver
 	{
 		return new PSQLException("postgresql.unimplemented");
 	}
+
+	/**
+	*	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
+	*	DEBUG most verbose
+	*/
+	public static void setLogLevel(int logLevel)
+	{
+		Driver.logLevel = logLevel;
+	}
 	/*
 	 * logging message at the debug level
 	 * messages will be printed if the logging level is less or equal to DEBUG

src/interfaces/jdbc/org/postgresql/core/QueryExecutor.java

@@ -13,7 +13,7 @@
  * <p>The lifetime of a QueryExecutor object is from sending the query
  * until the response has been received from the backend.
  *
- * $Id: QueryExecutor.java,v 1.8 2002/03/05 20:11:57 davec Exp $
+ * $Id: QueryExecutor.java,v 1.9 2002/03/16 02:15:23 davec Exp $
  */
 
 public class QueryExecutor
@@ -58,6 +58,8 @@ public java.sql.ResultSet execute() throws SQLException
 		int fqp = 0;
 		boolean hfr = false;
 
+		StringBuffer errorMessage = null;
+
 		synchronized (pg_stream)
 		{
 
@@ -91,7 +93,19 @@ public java.sql.ResultSet execute() throws SQLException
 						receiveTuple(false);
 						break;
 					case 'E':	// Error Message
-						throw new SQLException(pg_stream.ReceiveString(connection.getEncoding()));
+
+						// it's possible to get more than one error message for a query
+						// see libpq comments wrt backend closing a connection 
+						// so, append messages to a string buffer and keep processing
+						// check at the bottom to see if we need to throw an exception
+						
+						if ( errorMessage == null )
+							errorMessage = new StringBuffer();
+
+						errorMessage.append(pg_stream.ReceiveString(connection.getEncoding()));
+						// keep processing
+						break;
+
 					case 'I':	// Empty Query
 						int t = pg_stream.ReceiveChar();
 						if (t != 0)
@@ -117,6 +131,10 @@ public java.sql.ResultSet execute() throws SQLException
 						throw new PSQLException("postgresql.con.type",
 												new Character((char) c));
 				}
+
+				// did we get an error during this query?
+				if ( errorMessage != null )
+					throw new SQLException( errorMessage.toString() );
 			}
 			return connection.getResultSet(connection, statement, fields, tuples, status, update_count, insert_oid, binaryCursor);
 		}