Okay, I have some new code in place that hopefully should work better. I

couldn't produce a full patch using cvs diff -c this time since I have
created new files and anonymous cvs usage doesn't allow you to
adds. I'm supplying the modified src/interfaces/jdbc as a tarball at :
http://www.candleweb.no/~gunnar/projects/pgsql/postgres-jdbc-2000-10-05.tgz

The new files that should be added are :

? org/postgresql/PGStatement.java
? org/postgresql/ObjectPool.java
? org/postgresql/ObjectPoolFactory.java

There is now a global static pool of free byte arrays and used byte arrays
connected to a statement object. This is the role of the new PGStatement
class. Access to the global free array is synchronized, while we rely on
the PG_Stream synchronization for the used array.

My measurements show that the perfomance boost on this code is not quite as
big as my last shot, but it is still an improvement. Maybe some of the
difference is due to the new synchronization on the global array. I think I
will look into choosing between on a connection level and global level.

I have also started experimented with improving the performance of the
various conversions. The problem here is ofcourse related handle the
various encodings. One thing I found to speed up ResultSet.getInt() a lot
was to do custom conversion on the byte array into int instead of going
through the getString() to do the conversion. But I'm unsure if this is
portable, can we assume that a digit never can be represented by more than
one byte ? It works fine in my iso-latin-8859-1 environment, but what about
other environments ? Maybe we could provide different ResultSet
implementations depending on the encoding used or delegate some methods of
the result set to an "converter class".

Check the org/postgresql/jdbc2/FastResultSet.java in the tarball above to
see the modified getInt() method.

Regards,

        Gunnar

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

@@ -1497,7 +1497,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
     if(procedureNamePattern==null)
       procedureNamePattern="%";
     
-    r = connection.ExecSQL("select proname, proretset from pg_proc where proname like '"+procedureNamePattern.toLowerCase()+"' order by proname");
+    r = connection.ExecSQL(null, "select proname, proretset from pg_proc where proname like '"+procedureNamePattern.toLowerCase()+"' order by proname");
     
     while (r.next())
       {
@@ -1670,7 +1670,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
     sql.append("'");
     
     // Now run the query
-    r = connection.ExecSQL(sql.toString());
+    r = connection.ExecSQL(null, sql.toString());
     
     byte remarks[];
     
@@ -1679,7 +1679,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
 	byte[][] tuple = new byte[5][0];
 	
 	// Fetch the description for the table (if any)
-	java.sql.ResultSet dr = connection.ExecSQL("select description from pg_description where objoid="+r.getInt(2));
+	java.sql.ResultSet dr = connection.ExecSQL(null, "select description from pg_description where objoid="+r.getInt(2));
 	if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
 	  dr.next();
 	  remarks = dr.getBytes(1);
@@ -1893,7 +1893,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
     
     // Now form the query
     // Modified by Stefan Andreasen <stefan@linux.kapow.dk>
-    r = connection.ExecSQL("select a.oid,c.relname,a.attname,a.atttypid,a.attnum,a.attnotnull,a.attlen,a.atttypmod from pg_class c, pg_attribute a where a.attrelid=c.oid and c.relname like '"+tableNamePattern.toLowerCase()+"' and a.attname like '"+columnNamePattern.toLowerCase()+"' and a.attnum>0 order by c.relname,a.attnum");
+    r = connection.ExecSQL(null, "select a.oid,c.relname,a.attname,a.atttypid,a.attnum,a.attnotnull,a.attlen,a.atttypmod from pg_class c, pg_attribute a where a.attrelid=c.oid and c.relname like '"+tableNamePattern.toLowerCase()+"' and a.attname like '"+columnNamePattern.toLowerCase()+"' and a.attnum>0 order by c.relname,a.attnum");
     
     byte remarks[];
     
@@ -1901,7 +1901,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
 	byte[][] tuple = new byte[18][0];
 	
 	// Fetch the description for the table (if any)
-	java.sql.ResultSet dr = connection.ExecSQL("select description from pg_description where objoid="+r.getInt(1));
+	java.sql.ResultSet dr = connection.ExecSQL(null, "select description from pg_description where objoid="+r.getInt(1));
 	if(((org.postgresql.ResultSet)dr).getTupleCount()==1) {
 	  dr.next();
 	  tuple[11] = dr.getBytes(1);
@@ -1915,7 +1915,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
 	tuple[2] = r.getBytes(2);	// Table name
 	tuple[3] = r.getBytes(3);	// Column name
 	
-	dr = connection.ExecSQL("select typname from pg_type where oid = "+r.getString(4));
+	dr = connection.ExecSQL(null, "select typname from pg_type where oid = "+r.getString(4));
 	dr.next();
 	String typname=dr.getString(1);
 	dr.close();
@@ -2009,7 +2009,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
     f[7] = new Field(connection,"IS_GRANTABLE",iVarcharOid,32);
     
     // This is taken direct from the psql source
-    java.sql.ResultSet r = connection.ExecSQL("SELECT relname, relacl FROM pg_class, pg_user WHERE ( relkind = 'r' OR relkind = 'i') and relname !~ '^pg_' and relname !~ '^xin[vx][0-9]+' and usesysid = relowner and relname like '"+table.toLowerCase()+"' ORDER BY relname");
+    java.sql.ResultSet r = connection.ExecSQL(null, "SELECT relname, relacl FROM pg_class, pg_user WHERE ( relkind = 'r' OR relkind = 'i') and relname !~ '^pg_' and relname !~ '^xin[vx][0-9]+' and usesysid = relowner and relname like '"+table.toLowerCase()+"' ORDER BY relname");
     while(r.next()) {
       byte[][] tuple = new byte[8][0];
       tuple[0] = tuple[1]= "".getBytes();
@@ -2406,7 +2406,7 @@ public class DatabaseMetaData implements java.sql.DatabaseMetaData
    */
   public java.sql.ResultSet getTypeInfo() throws SQLException
   {
-    java.sql.ResultSet rs = connection.ExecSQL("select typname from pg_type");
+    java.sql.ResultSet rs = connection.ExecSQL(null, "select typname from pg_type");
     if(rs!=null) {
       Field f[] = new Field[18];
       ResultSet r;	// ResultSet for the SQL query that we need to do