fixed logic for snapshot and added tests

dbt/include/sqlserver/macros/materializations/snapshot/snapshot.sql

@@ -35,6 +35,7 @@
 
   {% set temp_snapshot_relation_sql = model['compiled_code'].replace("'", "''") %}
   {% call statement('create temp_snapshot_relation') %}
+    USE [{{ model.database}}];
     EXEC('DROP VIEW IF EXISTS {{ temp_snapshot_relation.include(database=False) }};');
     EXEC('create view {{ temp_snapshot_relation.include(database=False) }} as {{ temp_snapshot_relation_sql }};');
   {% endcall %}

dbt/include/sqlserver/macros/relations/table/create.sql

@@ -3,6 +3,7 @@
     {%- set tmp_relation = relation.incorporate(path={"identifier": relation.identifier ~ '__dbt_tmp_vw'}, type='view') -%}
 
     {%- do adapter.drop_relation(tmp_relation) -%}
+    USE [{{ relation.database }}];
     {{ get_create_view_as_sql(tmp_relation, sql) }}
 
     {%- set table_name -%}

dbt/include/sqlserver/macros/relations/views/create.sql

@@ -13,7 +13,7 @@
     {% set tst %}
     SELECT '1' as col
     {% endset %}
-
+    USE [{{ relation.database }}];
     EXEC('{{- escape_single_quotes(query) -}}')
 
 {% endmacro %}

tests/functional/adapter/mssql/test_cross_db.py

@@ -0,0 +1,170 @@
+import pytest
+from dbt.tests.util import get_connection, run_dbt
+
+snapshot_sql = """
+{% snapshot claims_snapshot %}
+
+{{
+   config(
+       target_database='secondary_db',
+       target_schema='dbo',
+       unique_key='id',
+
+       strategy='timestamp',
+       updated_at='updated_at',
+   )
+}}
+
+select * from {{source('mysource', 'claims')}}
+
+{% endsnapshot %}
+"""
+
+source_csv = """id,updated_date
+1,2024-01-01
+2,2024-01-01
+3,2024-01-01
+"""
+
+sources_yml = """
+version: 2
+sources:
+  - name: mysource
+    database: TestDB
+    tables:
+      - name: claims
+"""
+
+
+class TestCrossDB:
+    def create_secondary_db(self, project):
+        create_sql = """
+        DECLARE @col NVARCHAR(256)
+        SET @col = (SELECT CONVERT (varchar(256), SERVERPROPERTY('collation')));
+
+        IF NOT EXISTS (SELECT * FROM sys.databases WHERE name='secondary_db')
+        BEGIN
+            EXEC ('CREATE DATABASE secondary_db COLLATE ' + @col)
+        END
+        """
+
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                create_sql.format(database=project.database),
+                fetch=True,
+            )
+
+    def cleanup_secondary_database(self, project):
+        drop_sql = "DROP DATABASE IF EXISTS secondary_db"
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                drop_sql.format(database=project.database),
+                fetch=True,
+            )
+
+    def cleanup_primary_table(self, project):
+        drop_sql = "DROP TABLE IF EXISTS {database}.mysource.claims"
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                drop_sql.format(database=project.database),
+                fetch=True,
+            )
+
+    def cleanup_snapshot_table(self, project):
+        drop_sql = "DROP TABLE IF EXISTS TestDB_Secondary.dbo.claims_snapshot"
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                drop_sql,
+                fetch=True,
+            )
+
+    def create_source_schema(self, project):
+        create_sql = """
+        IF NOT EXISTS (SELECT * FROM sys.schemas WHERE name = 'mysource')
+        BEGIN
+            EXEC('CREATE SCHEMA mysource')
+        END
+        """
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                create_sql,
+                fetch=True,
+            )
+
+    def create_primary_table(self, project):
+        src_query = """
+        SELECT *
+        INTO
+            {database}.mysource.claims
+        FROM
+            (
+                SELECT
+                    1 as id,
+                    CAST('2024-01-01' as DATETIME2(6)) updated_at
+
+                UNION ALL
+
+                SELECT
+                    2 as id,
+                    CAST('2024-01-01' as DATETIME2(6)) updated_at
+
+                UNION ALL
+
+                SELECT
+                    3 as id,
+                    CAST('2024-01-01' as DATETIME2(6)) updated_at
+            ) as src_data
+        """
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                src_query.format(database=project.database, schema=project.test_schema),
+                fetch=True,
+            )
+
+    def create_secondary_schema(self, project):
+        src_query = """
+        USE [secondary_db]
+        EXEC ('CREATE SCHEMA {schema}')
+        """
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                src_query.format(database=project.database, schema=project.test_schema),
+                fetch=True,
+            )
+
+    def update_primary_table(self, project):
+        sql = """
+        UPDATE [{database}].[mysource].[claims]
+        SET
+        updated_at = CAST('2024-02-01' as datetime2(6))
+        WHERE
+        id = 3
+        """
+        with get_connection(project.adapter):
+            project.adapter.execute(
+                sql.format(database=project.database),
+                fetch=True,
+            )
+
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {"sources.yml": sources_yml}
+
+    @pytest.fixture(scope="class")
+    def snapshots(self):
+        return {"claims_snapshot.sql": snapshot_sql}
+
+    def test_cross_db_snapshot(self, project):
+        self.create_secondary_db(project)
+
+        self.cleanup_primary_table(project)
+        self.cleanup_snapshot_table(project)
+
+        self.create_source_schema(project)
+        self.create_primary_table(project)
+        run_dbt(["snapshot"])
+        self.update_primary_table(project)
+        run_dbt(["snapshot"])
+
+        self.cleanup_snapshot_table(project)
+        self.cleanup_secondary_database(project)