--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pgtoolkit/tools/batchcopy.py	Tue May 06 18:37:43 2014 +0200
@@ -0,0 +1,61 @@
+from pgtoolkit.toolbase import SrcDstTablesTool
+from pgtoolkit.pgmanager import IntegrityError
+
+
+class BatchCopyTool(SrcDstTablesTool):
+
+    """
+    Copy data from one table to another, filtering by specified condition.
+
+    """
+
+    def __init__(self):
+        SrcDstTablesTool.__init__(self, name='batchcopy', desc='')
+
+    def specify_args(self):
+        SrcDstTablesTool.specify_args(self)
+        self.parser.add_argument('--table-name', type=str, help='Table to be copied.')
+        self.parser.add_argument('--src-filter', type=str, help='WHERE condition for source query.')
+        self.parser.add_argument('--file-with-ids', type=str, help='Read source IDs from file (each ID on new line). Use these in --src-filter as {ids}')
+        self.parser.add_argument('--dst-exists', choices=['rollback', 'ignore', 'update'], default='rollback', help='What to do when destination record already exists.')
+
+    def main(self):
+        # read list of IDs from file
+        ids = '<no IDs read>'
+        if self.args.file_with_ids:
+            with open(self.args.file_with_ids, 'r') as f:
+                ids = ','.join(ln.rstrip() for ln in f.readlines())
+
+        # read source data
+        with self.pgm.cursor('src') as src_curs:
+            condition = self.args.src_filter.format(ids=ids) or 'true'
+            src_curs.execute('SELECT * FROM {} WHERE {}'.format(self.args.table_name, condition))
+            #TODO:  ORDER BY id OFFSET 0 LIMIT 100
+            data = src_curs.fetchall_dict()
+            src_curs.connection.commit()
+
+        with self.pgm.cursor('dst') as dst_curs:
+            copied = 0
+            for row in data:
+                keys = ', '.join(row.keys())
+                values_mask = ', '.join(['%s'] * len(row))
+                query = 'INSERT INTO {} ({}) VALUES ({})'.format(self.args.table_name, keys, values_mask)
+                try:
+                    dst_curs.execute('SAVEPOINT the_query;')
+                    dst_curs.execute(query, list(row.values()))
+                    dst_curs.execute('RELEASE SAVEPOINT the_query;')
+                    copied += 1
+                except IntegrityError:
+                    if self.args.dst_exists == 'rollback':
+                        dst_curs.connection.rollback()
+                        break
+                    elif self.args.dst_exists == 'ignore':
+                        dst_curs.execute('ROLLBACK TO SAVEPOINT the_query;')
+                    elif self.args.dst_exists == 'update':
+                        raise NotImplementedError()
+            dst_curs.connection.commit()
+
+        self.log.info('Copied %s rows.', copied)
+
+
+cls = BatchCopyTool