In non-threaded, non-pooled mode connections get not garbage collected with
MySQLdb for some reason unknown to me. This patch explicitly closes
connections and reduces load a  bit by reusing the same connections for all 
db activity of one type.

--- MiddleKit/Run/SQLObjectStore.py.orig	Sun Nov  2 12:14:49 2003
+++ MiddleKit/Run/SQLObjectStore.py	Sun Nov  2 12:35:27 2003
@@ -189,15 +189,17 @@
 
 	def commitInserts(self,allThreads=0):
 		unknownSerialNums = []
+		conn = self.newConnection()
 		for object in self._newObjects.items(allThreads):
-			self._insertObject(object, unknownSerialNums)
+			self._insertObject(object, unknownSerialNums, conn)
+		conn.close()
 
 		for unknownInfo in unknownSerialNums:
 			stmt = unknownInfo.updateStmt()
 			self.executeSQL(stmt)
 		self._newObjects.clear(allThreads)
 
-	def _insertObject(self, object, unknownSerialNums):
+	def _insertObject(self, object, unknownSerialNums, connection=None):
 		# New objects not in the persistent store have serial numbers less than 1
 		if object.serialNum()>0:
 			try:
@@ -208,10 +210,11 @@
 
 		# SQL insert
 		sql = object.sqlInsertStmt(unknownSerialNums)
-		conn, cur = self.executeSQL(sql)
+		conn, cur = self.executeSQL(sql, connection)
 
 		# Get new id/serial num
 		idNum = self.retrieveLastInsertId(conn, cur)
+		# for some reason connections get not garbage collected without this
 
 		# Update object
 		object.setSerialNum(idNum)
@@ -227,17 +230,21 @@
 		raise AbstractError, self.__class__
 
 	def commitUpdates(self,allThreads=0):
+                conn = self.newConnection()
 		for object in self._changedObjects.values(allThreads):
 			sql = object.sqlUpdateStmt()
-			self.executeSQL(sql)
+			self.executeSQL(sql, connection=conn)
 			object.setChanged(0)
 		self._changedObjects.clear(allThreads)
+		conn.close()
 
 	def commitDeletions(self,allThreads=0):
+		conn = self.newConnection()
 		for object in self._deletedObjects.items(allThreads):
 			sql = object.sqlDeleteStmt()
-			self.executeSQL(sql)
+			self.executeSQL(sql, connection=conn)
 		self._deletedObjects.clear(allThreads)
+		conn.close()
 
 
 	## Fetching ##