Handle timestamp incremental replication (#89)

* Handle timestamp (nothing to do with datetime -- SQL Server rowversion) incremental replication

* Release 2.6.4 prep

.bumpversion.cfg

@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 2.6.3
+current_version = 2.6.4
 parse = (?P<major>\d+)
 	\.(?P<minor>\d+)
 	\.(?P<patch>\d+)

CHANGELOG.md

@@ -1,3 +1,7 @@
+# tap-mssql 2.6.4 2024-10-24
+* Update to handle `timestamp` (not a datetime value, a [deprecated](https://learn.microsoft.com/en-us/sql/t-sql/data-types/rowversion-transact-sql?view=sql-server-ver16#remarks) synonym of internal `rowversion`) as string
+* Add tests for incremental syncing using a `timestamp` column as `replication-key`
+
 # tap-mssql 2.6.3 2024-10-17
 * Updating CDC documentation with a packaged method to maintain CDC tables.
 

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "tap-mssql"
-version = "2.6.3"
+version = "2.6.4"
 description = "A pipelinewise compatible tap for connecting Microsoft SQL Server"
 authors = ["Rob Winters <[email protected]>"]
 license = "GNU Affero"

tap_mssql/__init__.py

@@ -66,7 +66,7 @@
 
 DECIMAL_TYPES = set(["decimal", "number", "money", "smallmoney", "numeric"])
 
-DATETIME_TYPES = set(["datetime2", "datetime", "datetimeoffset", "timestamp", "smalldatetime"])
+DATETIME_TYPES = set(["datetime2", "datetime", "datetimeoffset", "smalldatetime"])
 
 DATE_TYPES = set(["date"])
 
@@ -101,6 +101,10 @@ def schema_for_column(c, config):
 
     if data_type == "bit":
         result.type = ["null", "boolean"]
+
+    elif data_type in ["timestamp", "rowversion"]:
+        result.type = ["null", "string"]
+        result.format = "rowversion"
 
     elif data_type in BYTES_FOR_INTEGER_TYPE:
         result.type = ["null", "integer"]

tap_mssql/sync_strategies/incremental.py

@@ -57,11 +57,19 @@ def sync_table(mssql_conn, config, catalog_entry, state, columns):
                     replication_key_value = datetime.fromtimestamp(
                         pendulum.parse(replication_key_value).timestamp()
                     )
+                # Handle timestamp incremental (timestamp)
+                if catalog_entry.schema.properties[replication_key_metadata].format == 'rowversion':
+                    select_sql += """ WHERE CAST("{}" AS BIGINT) >= 
+                    convert(bigint, convert (varbinary(8), '0x{}', 1))
+                    ORDER BY "{}" ASC""".format(
+                        replication_key_metadata, replication_key_value, replication_key_metadata
+                    )
 
+                else:
+                    select_sql += ' WHERE "{}" >= %(replication_key_value)s ORDER BY "{}" ASC'.format(
+                        replication_key_metadata, replication_key_metadata
+                    )
 
-                select_sql += ' WHERE "{}" >= %(replication_key_value)s ORDER BY "{}" ASC'.format(
-                    replication_key_metadata, replication_key_metadata
-                )
 
                 params["replication_key_value"] = replication_key_value
             elif replication_key_metadata is not None:

tests/test_tap_mssql.py

@@ -561,15 +561,15 @@ def test_with_no_state(self):
 
         (message_types, versions) = message_types_and_versions(SINGER_MESSAGES)
 
-        self.assertEqual(
-            [
-                "ActivateVersionMessage",
-                "RecordMessage",
-            ],
-            sorted(list(set(message_types))),
-        )
+
         self.assertTrue(isinstance(versions[0], int))
         self.assertEqual(versions[0], versions[1])
+        record_messages = [message for message in SINGER_MESSAGES if isinstance(message,singer.RecordMessage)]
+        incremental_record_messages = [m for m in record_messages if m.stream == 'dbo-incremental']
+        integer_incremental_record_messages = [m for m in record_messages if m.stream == 'dbo-integer_incremental']
+
+        self.assertEqual(len(incremental_record_messages),3)
+        self.assertEqual(len(integer_incremental_record_messages),3)
 
     def test_with_state(self):
         state = {
@@ -602,7 +602,14 @@ def test_with_state(self):
         )
         self.assertTrue(isinstance(versions[0], int))
         self.assertEqual(versions[0], versions[1])
-        self.assertEqual(versions[1], 12345)
+
+        # Based on state values provided check the number of record messages emitted
+        record_messages = [message for message in SINGER_MESSAGES if isinstance(message,singer.RecordMessage)]
+        incremental_record_messages = [m for m in record_messages if m.stream == 'dbo-incremental']
+        integer_incremental_record_messages = [m for m in record_messages if m.stream == 'dbo-integer_incremental']
+
+        self.assertEqual(len(incremental_record_messages),2)
+        self.assertEqual(len(integer_incremental_record_messages),1)
 
 
 class TestViews(unittest.TestCase):
@@ -650,6 +657,76 @@ def test_do_not_discover_key_properties_for_view(self):
 
         self.assertEqual(primary_keys, {"a_table": ["id"], "a_view": []})
 
+class TestTimestampIncrementalReplication(unittest.TestCase):
+    def setUp(self):
+        self.conn = test_utils.get_test_connection()
+
+        with connect_with_backoff(self.conn) as open_conn:
+            with open_conn.cursor() as cursor:
+                try:
+                    cursor.execute("drop table incremental")
+                except:
+                    pass
+                cursor.execute("CREATE TABLE incremental (val int, updated timestamp)")
+                cursor.execute("INSERT INTO incremental (val) VALUES (1)") #00000000000007d1
+                cursor.execute("INSERT INTO incremental (val) VALUES (2)") #00000000000007d2
+                cursor.execute("INSERT INTO incremental (val) VALUES (3)") #00000000000007d3
+
+        self.catalog = test_utils.discover_catalog(self.conn, {})
+
+        for stream in self.catalog.streams:
+            stream.metadata = [
+                {
+                    "breadcrumb": (),
+                    "metadata": {
+                        "selected": True,
+                        "table-key-properties": [],
+                        "database-name": "dbo",
+                    },
+                },
+                {"breadcrumb": ("properties", "val"), "metadata": {"selected": True}},
+            ]
+
+            stream.stream = stream.table
+            test_utils.set_replication_method_and_key(stream, "INCREMENTAL", "updated")
+
+    def test_with_no_state(self):
+        state = {}
+
+        global SINGER_MESSAGES
+        SINGER_MESSAGES.clear()
+
+        tap_mssql.do_sync(self.conn, test_utils.get_db_config(), self.catalog, state)
+
+        (message_types, versions) = message_types_and_versions(SINGER_MESSAGES)
+
+        record_messages = [message for message in SINGER_MESSAGES if isinstance(message,singer.RecordMessage)]
+
+        self.assertEqual(len(record_messages),3)
+
+
+    def test_with_state(self):
+        state = {
+            "bookmarks": {
+                "dbo-incremental": {
+                    "version": 1,
+                    "replication_key_value": '00000000000007d2',
+                    "replication_key": "updated",
+                },
+            }
+        }
+
+        global SINGER_MESSAGES
+        SINGER_MESSAGES.clear()
+        tap_mssql.do_sync(self.conn, test_utils.get_db_config(), self.catalog, state)
+
+        (message_types, versions) = message_types_and_versions(SINGER_MESSAGES)
+
+        # Given the state value supplied, there should only be two RECORD messages
+        record_messages = [message for message in SINGER_MESSAGES if isinstance(message,singer.RecordMessage)]
+
+        self.assertEqual(len(record_messages),2)
+
 class TestPrimaryKeyUniqueKey(unittest.TestCase):
     def setUp(self):
         self.conn = test_utils.get_test_connection()
@@ -708,6 +785,7 @@ def test_only_primary_key(self):
         self.assertEqual(primary_keys["pk_only_table"], ["pk"])
         self.assertEqual(primary_keys["pk_uc_table"], ["pk"])
 
+
 if __name__ == "__main__":
     # test1 = TestBinlogReplication()
     # test1.setUp()