feat(spanner): Add Cloud Spanner last statement samples

spanner/spanner_snippets/spanner/integration_test.go

@@ -1332,6 +1332,44 @@ func TestAddSplitPointsSample(t *testing.T) {
 	assertContains(t, out, "Added split points")
 }
 
+func TestDmlWithLastStatementSample(t *testing.T) {
+	_ = testutil.SystemTest(t)
+	t.Parallel()
+
+	_, dbName, cleanup := initTest(t, randomID())
+	defer cleanup()
+
+	_, cancel := context.WithTimeout(context.Background(), time.Hour)
+	defer cancel()
+	mustRunSample(t, createDatabase, dbName, "failed to create a database")
+
+	out := runSample(t, insertAndUpdateDmlWithLastStatement, dbName, "failed to insert and then update using DML with last statement option")
+	assertContains(t, out, "1 record(s) inserted.")
+	assertContains(t, out, "1 record(s) updated.")
+}
+
+func TestPgDmlWithLastStatementSample(t *testing.T) {
+	_ = testutil.SystemTest(t)
+	t.Parallel()
+
+	_, dbName, cleanup := initTest(t, randomID())
+	defer cleanup()
+	dbCleanup, err := createTestPgDatabase(dbName,
+		`CREATE TABLE Singers (
+		   SingerId  bigint NOT NULL PRIMARY KEY,
+		   FirstName varchar(1024),
+		   LastName  varchar(1024)
+		 )`)
+	if err != nil {
+		t.Fatalf("failed to create test database: %v", err)
+	}
+	defer dbCleanup()
+
+	out := runSample(t, pgInsertAndUpdateDmlWithLastStatement, dbName, "failed to insert and then update using DML with last statement option")
+	assertContains(t, out, "1 record(s) inserted.")
+	assertContains(t, out, "1 record(s) updated.")
+}
+
 func maybeCreateKey(projectId, locationId, keyRingId, keyId string) error {
 	client, err := kms.NewKeyManagementClient(context.Background())
 	if err != nil {

spanner/spanner_snippets/spanner/pg_spanner_dml_last_statement.go

@@ -0,0 +1,67 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package spanner
+
+// [START spanner_postgresql_dml_last_statement]
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"cloud.google.com/go/spanner"
+)
+
+// Inserts a record into the Singers table and then updates
+// the row while also setting the update DML as the last
+// statement.
+func pgInsertAndUpdateDmlWithLastStatement(w io.Writer, db string) error {
+	ctx := context.Background()
+	client, err := spanner.NewClient(ctx, db)
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+
+	_, err = client.ReadWriteTransaction(ctx, func(ctx context.Context, txn *spanner.ReadWriteTransaction) error {
+		insertStmt := spanner.Statement{
+			SQL: `INSERT INTO Singers (SingerId, FirstName, LastName)
+					VALUES (54214, 'John', 'Do')`,
+		}
+		insertRowCount, err := txn.Update(ctx, insertStmt)
+		if err != nil {
+			return err
+		}
+		fmt.Fprintf(w, "%d record(s) inserted.\n", insertRowCount)
+
+		updateStmt := spanner.Statement{
+			SQL: `UPDATE Singers SET LastName = 'Doe' WHERE SingerId = 54214`,
+		}
+		opts := spanner.QueryOptions{LastStatement: true}
+		updateRowCount, err := txn.UpdateWithOptions(ctx, updateStmt, opts)
+		if err != nil {
+			return err
+		}
+		fmt.Fprintf(w, "%d record(s) updated.\n", updateRowCount)
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// [END spanner_postgresql_dml_last_statement]

spanner/spanner_snippets/spanner/spanner_dml_last_statement.go

@@ -0,0 +1,67 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package spanner
+
+// [START spanner_dml_last_statement]
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"cloud.google.com/go/spanner"
+)
+
+// Inserts a record into the Singers table and then updates
+// the row while also setting the update DML as the last
+// statement.
+func insertAndUpdateDmlWithLastStatement(w io.Writer, db string) error {
+	ctx := context.Background()
+	client, err := spanner.NewClient(ctx, db)
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+
+	_, err = client.ReadWriteTransaction(ctx, func(ctx context.Context, txn *spanner.ReadWriteTransaction) error {
+		insertStmt := spanner.Statement{
+			SQL: `INSERT Singers (SingerId, FirstName, LastName)
+					VALUES (54213, 'John', 'Do')`,
+		}
+		insertRowCount, err := txn.Update(ctx, insertStmt)
+		if err != nil {
+			return err
+		}
+		fmt.Fprintf(w, "%d record(s) inserted.\n", insertRowCount)
+
+		updateStmt := spanner.Statement{
+			SQL: `UPDATE Singers SET LastName = 'Doe' WHERE SingerId = 54213`,
+		}
+		opts := spanner.QueryOptions{LastStatement: true}
+		updateRowCount, err := txn.UpdateWithOptions(ctx, updateStmt, opts)
+		if err != nil {
+			return err
+		}
+		fmt.Fprintf(w, "%d record(s) updated.\n", updateRowCount)
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// [END spanner_dml_last_statement]