spanner-sample

Spanner Sample Application with GraalVM

This is a sample application which uses the Cloud Spanner client libraries and demonstrates compatibility with GraalVM native image compilation.

The application creates a new Spanner instance and database, and it runs basic operations including queries and Spanner mutations.

Setup Instructions

1. Follow the GCP Project and GraalVM Setup Instructions.

2. If you wish to run the application against the Spanner emulator, make sure that you have the Google Cloud SDK installed.

   In a new terminal window, start the emulator via gcloud:

   gcloud beta emulators spanner start
   

   You may leave the emulator running for now. In the next section, we will run the sample application against the Spanner emulator instsance.

Run with GraalVM Compilation

1. Navigate to this directory and compile the application with the GraalVM compiler.

   mvn package -P graal
   

2. (Optional) If you're using the emulator, export the SPANNER_EMULATOR_HOST as an environment variable in your terminal.

   export SPANNER_EMULATOR_HOST=localhost:9010
   

   The Spanner Client Libraries will detect this environment variable and will automatically connect to the emulator instance if this variable is set.

3. Run the application.

   ./target/com.example.spannersampleapplication 
   

4. The application will run through some basic Spanner operations and log some output statements.

   Running the Spanner Sample.
   Singers Registered in Spanner:
   Bob Loblaw
   Virginia Watson